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TOMOYO Linux Cross Reference
Linux/lib/Kconfig.debug

Version: ~ [ linux-6.11.5 ] ~ [ linux-6.10.14 ] ~ [ linux-6.9.12 ] ~ [ linux-6.8.12 ] ~ [ linux-6.7.12 ] ~ [ linux-6.6.58 ] ~ [ linux-6.5.13 ] ~ [ linux-6.4.16 ] ~ [ linux-6.3.13 ] ~ [ linux-6.2.16 ] ~ [ linux-6.1.114 ] ~ [ linux-6.0.19 ] ~ [ linux-5.19.17 ] ~ [ linux-5.18.19 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.169 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.228 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.284 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.322 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.336 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.337 ] ~ [ linux-4.4.302 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

Diff markup

Differences between /lib/Kconfig.debug (Version linux-6.11.5) and /lib/Kconfig.debug (Version linux-6.6.58)


  1 # SPDX-License-Identifier: GPL-2.0-only             1 # SPDX-License-Identifier: GPL-2.0-only
  2 menu "Kernel hacking"                               2 menu "Kernel hacking"
  3                                                     3 
  4 menu "printk and dmesg options"                     4 menu "printk and dmesg options"
  5                                                     5 
  6 config PRINTK_TIME                                  6 config PRINTK_TIME
  7         bool "Show timing information on print      7         bool "Show timing information on printks"
  8         depends on PRINTK                           8         depends on PRINTK
  9         help                                        9         help
 10           Selecting this option causes time st     10           Selecting this option causes time stamps of the printk()
 11           messages to be added to the output o     11           messages to be added to the output of the syslog() system
 12           call and at the console.                 12           call and at the console.
 13                                                    13 
 14           The timestamp is always recorded int     14           The timestamp is always recorded internally, and exported
 15           to /dev/kmsg. This flag just specifi     15           to /dev/kmsg. This flag just specifies if the timestamp should
 16           be included, not that the timestamp      16           be included, not that the timestamp is recorded.
 17                                                    17 
 18           The behavior is also controlled by t     18           The behavior is also controlled by the kernel command line
 19           parameter printk.time=1. See Documen     19           parameter printk.time=1. See Documentation/admin-guide/kernel-parameters.rst
 20                                                    20 
 21 config PRINTK_CALLER                               21 config PRINTK_CALLER
 22         bool "Show caller information on print     22         bool "Show caller information on printks"
 23         depends on PRINTK                          23         depends on PRINTK
 24         help                                       24         help
 25           Selecting this option causes printk(     25           Selecting this option causes printk() to add a caller "thread id" (if
 26           in task context) or a caller "proces     26           in task context) or a caller "processor id" (if not in task context)
 27           to every message.                        27           to every message.
 28                                                    28 
 29           This option is intended for environm     29           This option is intended for environments where multiple threads
 30           concurrently call printk() for many      30           concurrently call printk() for many times, for it is difficult to
 31           interpret without knowing where thes     31           interpret without knowing where these lines (or sometimes individual
 32           line which was divided into multiple     32           line which was divided into multiple lines due to race) came from.
 33                                                    33 
 34           Since toggling after boot makes the      34           Since toggling after boot makes the code racy, currently there is
 35           no option to enable/disable at the k     35           no option to enable/disable at the kernel command line parameter or
 36           sysfs interface.                         36           sysfs interface.
 37                                                    37 
 38 config STACKTRACE_BUILD_ID                         38 config STACKTRACE_BUILD_ID
 39         bool "Show build ID information in sta     39         bool "Show build ID information in stacktraces"
 40         depends on PRINTK                          40         depends on PRINTK
 41         help                                       41         help
 42           Selecting this option adds build ID      42           Selecting this option adds build ID information for symbols in
 43           stacktraces printed with the printk      43           stacktraces printed with the printk format '%p[SR]b'.
 44                                                    44 
 45           This option is intended for distros      45           This option is intended for distros where debuginfo is not easily
 46           accessible but can be downloaded giv     46           accessible but can be downloaded given the build ID of the vmlinux or
 47           kernel module where the function is      47           kernel module where the function is located.
 48                                                    48 
 49 config CONSOLE_LOGLEVEL_DEFAULT                    49 config CONSOLE_LOGLEVEL_DEFAULT
 50         int "Default console loglevel (1-15)"      50         int "Default console loglevel (1-15)"
 51         range 1 15                                 51         range 1 15
 52         default "7"                                52         default "7"
 53         help                                       53         help
 54           Default loglevel to determine what w     54           Default loglevel to determine what will be printed on the console.
 55                                                    55 
 56           Setting a default here is equivalent     56           Setting a default here is equivalent to passing in loglevel=<x> in
 57           the kernel bootargs. loglevel=<x> co     57           the kernel bootargs. loglevel=<x> continues to override whatever
 58           value is specified here as well.         58           value is specified here as well.
 59                                                    59 
 60           Note: This does not affect the log l     60           Note: This does not affect the log level of un-prefixed printk()
 61           usage in the kernel. That is control     61           usage in the kernel. That is controlled by the MESSAGE_LOGLEVEL_DEFAULT
 62           option.                                  62           option.
 63                                                    63 
 64 config CONSOLE_LOGLEVEL_QUIET                      64 config CONSOLE_LOGLEVEL_QUIET
 65         int "quiet console loglevel (1-15)"        65         int "quiet console loglevel (1-15)"
 66         range 1 15                                 66         range 1 15
 67         default "4"                                67         default "4"
 68         help                                       68         help
 69           loglevel to use when "quiet" is pass     69           loglevel to use when "quiet" is passed on the kernel commandline.
 70                                                    70 
 71           When "quiet" is passed on the kernel     71           When "quiet" is passed on the kernel commandline this loglevel
 72           will be used as the loglevel. IOW pa     72           will be used as the loglevel. IOW passing "quiet" will be the
 73           equivalent of passing "loglevel=<CON     73           equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"
 74                                                    74 
 75 config MESSAGE_LOGLEVEL_DEFAULT                    75 config MESSAGE_LOGLEVEL_DEFAULT
 76         int "Default message log level (1-7)"      76         int "Default message log level (1-7)"
 77         range 1 7                                  77         range 1 7
 78         default "4"                                78         default "4"
 79         help                                       79         help
 80           Default log level for printk stateme     80           Default log level for printk statements with no specified priority.
 81                                                    81 
 82           This was hard-coded to KERN_WARNING      82           This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
 83           that are auditing their logs closely     83           that are auditing their logs closely may want to set it to a lower
 84           priority.                                84           priority.
 85                                                    85 
 86           Note: This does not affect what mess     86           Note: This does not affect what message level gets printed on the console
 87           by default. To change that, use logl     87           by default. To change that, use loglevel=<x> in the kernel bootargs,
 88           or pick a different CONSOLE_LOGLEVEL     88           or pick a different CONSOLE_LOGLEVEL_DEFAULT configuration value.
 89                                                    89 
 90 config BOOT_PRINTK_DELAY                           90 config BOOT_PRINTK_DELAY
 91         bool "Delay each boot printk message b     91         bool "Delay each boot printk message by N milliseconds"
 92         depends on DEBUG_KERNEL && PRINTK && G     92         depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
 93         help                                       93         help
 94           This build option allows you to read     94           This build option allows you to read kernel boot messages
 95           by inserting a short delay after eac     95           by inserting a short delay after each one.  The delay is
 96           specified in milliseconds on the ker     96           specified in milliseconds on the kernel command line,
 97           using "boot_delay=N".                    97           using "boot_delay=N".
 98                                                    98 
 99           It is likely that you would also nee     99           It is likely that you would also need to use "lpj=M" to preset
100           the "loops per jiffie" value.           100           the "loops per jiffie" value.
101           See a previous boot log for the "lpj    101           See a previous boot log for the "lpj" value to use for your
102           system, and then set "lpj=M" before     102           system, and then set "lpj=M" before setting "boot_delay=N".
103           NOTE:  Using this option may adverse    103           NOTE:  Using this option may adversely affect SMP systems.
104           I.e., processors other than the firs    104           I.e., processors other than the first one may not boot up.
105           BOOT_PRINTK_DELAY also may cause LOC    105           BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
106           what it believes to be lockup condit    106           what it believes to be lockup conditions.
107                                                   107 
108 config DYNAMIC_DEBUG                              108 config DYNAMIC_DEBUG
109         bool "Enable dynamic printk() support"    109         bool "Enable dynamic printk() support"
110         default n                                 110         default n
111         depends on PRINTK                         111         depends on PRINTK
112         depends on (DEBUG_FS || PROC_FS)          112         depends on (DEBUG_FS || PROC_FS)
113         select DYNAMIC_DEBUG_CORE                 113         select DYNAMIC_DEBUG_CORE
114         help                                      114         help
115                                                   115 
116           Compiles debug level messages into t    116           Compiles debug level messages into the kernel, which would not
117           otherwise be available at runtime. T    117           otherwise be available at runtime. These messages can then be
118           enabled/disabled based on various le    118           enabled/disabled based on various levels of scope - per source file,
119           function, module, format string, and    119           function, module, format string, and line number. This mechanism
120           implicitly compiles in all pr_debug(    120           implicitly compiles in all pr_debug() and dev_dbg() calls, which
121           enlarges the kernel text size by abo    121           enlarges the kernel text size by about 2%.
122                                                   122 
123           If a source file is compiled with DE    123           If a source file is compiled with DEBUG flag set, any
124           pr_debug() calls in it are enabled b    124           pr_debug() calls in it are enabled by default, but can be
125           disabled at runtime as below.  Note     125           disabled at runtime as below.  Note that DEBUG flag is
126           turned on by many CONFIG_*DEBUG* opt    126           turned on by many CONFIG_*DEBUG* options.
127                                                   127 
128           Usage:                                  128           Usage:
129                                                   129 
130           Dynamic debugging is controlled via     130           Dynamic debugging is controlled via the 'dynamic_debug/control' file,
131           which is contained in the 'debugfs'     131           which is contained in the 'debugfs' filesystem or procfs.
132           Thus, the debugfs or procfs filesyst    132           Thus, the debugfs or procfs filesystem must first be mounted before
133           making use of this feature.             133           making use of this feature.
134           We refer the control file as: <debug    134           We refer the control file as: <debugfs>/dynamic_debug/control. This
135           file contains a list of the debug st    135           file contains a list of the debug statements that can be enabled. The
136           format for each line of the file is:    136           format for each line of the file is:
137                                                   137 
138                 filename:lineno [module]functi    138                 filename:lineno [module]function flags format
139                                                   139 
140           filename : source file of the debug     140           filename : source file of the debug statement
141           lineno : line number of the debug st    141           lineno : line number of the debug statement
142           module : module that contains the de    142           module : module that contains the debug statement
143           function : function that contains th    143           function : function that contains the debug statement
144           flags : '=p' means the line is turne    144           flags : '=p' means the line is turned 'on' for printing
145           format : the format used for the deb    145           format : the format used for the debug statement
146                                                   146 
147           From a live system:                     147           From a live system:
148                                                   148 
149                 nullarbor:~ # cat <debugfs>/dy    149                 nullarbor:~ # cat <debugfs>/dynamic_debug/control
150                 # filename:lineno [module]func    150                 # filename:lineno [module]function flags format
151                 fs/aio.c:222 [aio]__put_ioctx     151                 fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
152                 fs/aio.c:248 [aio]ioctx_alloc     152                 fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
153                 fs/aio.c:1770 [aio]sys_io_canc    153                 fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
154                                                   154 
155           Example usage:                          155           Example usage:
156                                                   156 
157                 // enable the message at line     157                 // enable the message at line 1603 of file svcsock.c
158                 nullarbor:~ # echo -n 'file sv    158                 nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
159                                                   159                                                 <debugfs>/dynamic_debug/control
160                                                   160 
161                 // enable all the messages in     161                 // enable all the messages in file svcsock.c
162                 nullarbor:~ # echo -n 'file sv    162                 nullarbor:~ # echo -n 'file svcsock.c +p' >
163                                                   163                                                 <debugfs>/dynamic_debug/control
164                                                   164 
165                 // enable all the messages in     165                 // enable all the messages in the NFS server module
166                 nullarbor:~ # echo -n 'module     166                 nullarbor:~ # echo -n 'module nfsd +p' >
167                                                   167                                                 <debugfs>/dynamic_debug/control
168                                                   168 
169                 // enable all 12 messages in t    169                 // enable all 12 messages in the function svc_process()
170                 nullarbor:~ # echo -n 'func sv    170                 nullarbor:~ # echo -n 'func svc_process +p' >
171                                                   171                                                 <debugfs>/dynamic_debug/control
172                                                   172 
173                 // disable all 12 messages in     173                 // disable all 12 messages in the function svc_process()
174                 nullarbor:~ # echo -n 'func sv    174                 nullarbor:~ # echo -n 'func svc_process -p' >
175                                                   175                                                 <debugfs>/dynamic_debug/control
176                                                   176 
177           See Documentation/admin-guide/dynami    177           See Documentation/admin-guide/dynamic-debug-howto.rst for additional
178           information.                            178           information.
179                                                   179 
180 config DYNAMIC_DEBUG_CORE                         180 config DYNAMIC_DEBUG_CORE
181         bool "Enable core function of dynamic     181         bool "Enable core function of dynamic debug support"
182         depends on PRINTK                         182         depends on PRINTK
183         depends on (DEBUG_FS || PROC_FS)          183         depends on (DEBUG_FS || PROC_FS)
184         help                                      184         help
185           Enable core functional support of dy    185           Enable core functional support of dynamic debug. It is useful
186           when you want to tie dynamic debug t    186           when you want to tie dynamic debug to your kernel modules with
187           DYNAMIC_DEBUG_MODULE defined for eac    187           DYNAMIC_DEBUG_MODULE defined for each of them, especially for
188           the case of embedded system where th    188           the case of embedded system where the kernel image size is
189           sensitive for people.                   189           sensitive for people.
190                                                   190 
191 config SYMBOLIC_ERRNAME                           191 config SYMBOLIC_ERRNAME
192         bool "Support symbolic error names in     192         bool "Support symbolic error names in printf"
193         default y if PRINTK                       193         default y if PRINTK
194         help                                      194         help
195           If you say Y here, the kernel's prin    195           If you say Y here, the kernel's printf implementation will
196           be able to print symbolic error name    196           be able to print symbolic error names such as ENOSPC instead
197           of the number 28. It makes the kerne    197           of the number 28. It makes the kernel image slightly larger
198           (about 3KB), but can make the kernel    198           (about 3KB), but can make the kernel logs easier to read.
199                                                   199 
200 config DEBUG_BUGVERBOSE                           200 config DEBUG_BUGVERBOSE
201         bool "Verbose BUG() reporting (adds 70    201         bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
202         depends on BUG && (GENERIC_BUG || HAVE    202         depends on BUG && (GENERIC_BUG || HAVE_DEBUG_BUGVERBOSE)
203         default y                                 203         default y
204         help                                      204         help
205           Say Y here to make BUG() panics outp    205           Say Y here to make BUG() panics output the file name and line number
206           of the BUG call as well as the EIP a    206           of the BUG call as well as the EIP and oops trace.  This aids
207           debugging but costs about 70-100K of    207           debugging but costs about 70-100K of memory.
208                                                   208 
209 endmenu # "printk and dmesg options"              209 endmenu # "printk and dmesg options"
210                                                   210 
211 config DEBUG_KERNEL                               211 config DEBUG_KERNEL
212         bool "Kernel debugging"                   212         bool "Kernel debugging"
213         help                                      213         help
214           Say Y here if you are developing dri    214           Say Y here if you are developing drivers or trying to debug and
215           identify kernel problems.               215           identify kernel problems.
216                                                   216 
217 config DEBUG_MISC                                 217 config DEBUG_MISC
218         bool "Miscellaneous debug code"           218         bool "Miscellaneous debug code"
219         default DEBUG_KERNEL                      219         default DEBUG_KERNEL
220         depends on DEBUG_KERNEL                   220         depends on DEBUG_KERNEL
221         help                                      221         help
222           Say Y here if you need to enable mis    222           Say Y here if you need to enable miscellaneous debug code that should
223           be under a more specific debug optio    223           be under a more specific debug option but isn't.
224                                                   224 
225 menu "Compile-time checks and compiler options    225 menu "Compile-time checks and compiler options"
226                                                   226 
227 config DEBUG_INFO                                 227 config DEBUG_INFO
228         bool                                      228         bool
229         help                                      229         help
230           A kernel debug info option other tha    230           A kernel debug info option other than "None" has been selected
231           in the "Debug information" choice be    231           in the "Debug information" choice below, indicating that debug
232           information will be generated for bu    232           information will be generated for build targets.
233                                                   233 
234 # Clang generates .uleb128 with label differen !! 234 # Clang is known to generate .{s,u}leb128 with symbol deltas with DWARF5, which
235 # older binutils ports do not support when uti !! 235 # some targets may not support: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
236 # relaxation: https://sourceware.org/bugzilla/ !! 236 config AS_HAS_NON_CONST_LEB128
237 config AS_HAS_NON_CONST_ULEB128                << 
238         def_bool $(as-instr,.uleb128 .Lexpr_en    237         def_bool $(as-instr,.uleb128 .Lexpr_end4 - .Lexpr_start3\n.Lexpr_start3:\n.Lexpr_end4:)
239                                                   238 
240 choice                                            239 choice
241         prompt "Debug information"                240         prompt "Debug information"
242         depends on DEBUG_KERNEL                   241         depends on DEBUG_KERNEL
243         help                                      242         help
244           Selecting something other than "None    243           Selecting something other than "None" results in a kernel image
245           that will include debugging info res    244           that will include debugging info resulting in a larger kernel image.
246           This adds debug symbols to the kerne    245           This adds debug symbols to the kernel and modules (gcc -g), and
247           is needed if you intend to use kerne    246           is needed if you intend to use kernel crashdump or binary object
248           tools like crash, kgdb, LKCD, gdb, e    247           tools like crash, kgdb, LKCD, gdb, etc on the kernel.
249                                                   248 
250           Choose which version of DWARF debug     249           Choose which version of DWARF debug info to emit. If unsure,
251           select "Toolchain default".             250           select "Toolchain default".
252                                                   251 
253 config DEBUG_INFO_NONE                            252 config DEBUG_INFO_NONE
254         bool "Disable debug information"          253         bool "Disable debug information"
255         help                                      254         help
256           Do not build the kernel with debuggi    255           Do not build the kernel with debugging information, which will
257           result in a faster and smaller build    256           result in a faster and smaller build.
258                                                   257 
259 config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT         258 config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
260         bool "Rely on the toolchain's implicit    259         bool "Rely on the toolchain's implicit default DWARF version"
261         select DEBUG_INFO                         260         select DEBUG_INFO
262         depends on !CC_IS_CLANG || AS_IS_LLVM  !! 261         depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
263         help                                      262         help
264           The implicit default version of DWAR    263           The implicit default version of DWARF debug info produced by a
265           toolchain changes over time.            264           toolchain changes over time.
266                                                   265 
267           This can break consumers of the debu    266           This can break consumers of the debug info that haven't upgraded to
268           support newer revisions, and prevent    267           support newer revisions, and prevent testing newer versions, but
269           those should be less common scenario    268           those should be less common scenarios.
270                                                   269 
271 config DEBUG_INFO_DWARF4                          270 config DEBUG_INFO_DWARF4
272         bool "Generate DWARF Version 4 debugin    271         bool "Generate DWARF Version 4 debuginfo"
273         select DEBUG_INFO                         272         select DEBUG_INFO
274         depends on !CC_IS_CLANG || AS_IS_LLVM     273         depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)
275         help                                      274         help
276           Generate DWARF v4 debug info. This r    275           Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
277           if using clang without clang's integ    276           if using clang without clang's integrated assembler, and gdb 7.0+.
278                                                   277 
279           If you have consumers of DWARF debug    278           If you have consumers of DWARF debug info that are not ready for
280           newer revisions of DWARF, you may wi    279           newer revisions of DWARF, you may wish to choose this or have your
281           config select this.                     280           config select this.
282                                                   281 
283 config DEBUG_INFO_DWARF5                          282 config DEBUG_INFO_DWARF5
284         bool "Generate DWARF Version 5 debugin    283         bool "Generate DWARF Version 5 debuginfo"
285         select DEBUG_INFO                         284         select DEBUG_INFO
286         depends on !ARCH_HAS_BROKEN_DWARF5     !! 285         depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
287         depends on !CC_IS_CLANG || AS_IS_LLVM  << 
288         help                                      286         help
289           Generate DWARF v5 debug info. Requir    287           Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc
290           5.0+ accepts the -gdwarf-5 flag but     288           5.0+ accepts the -gdwarf-5 flag but only had partial support for some
291           draft features until 7.0), and gdb 8    289           draft features until 7.0), and gdb 8.0+.
292                                                   290 
293           Changes to the structure of debug in    291           Changes to the structure of debug info in Version 5 allow for around
294           15-18% savings in resulting image an    292           15-18% savings in resulting image and debug info section sizes as
295           compared to DWARF Version 4. DWARF V    293           compared to DWARF Version 4. DWARF Version 5 standardizes previous
296           extensions such as accelerators for     294           extensions such as accelerators for symbol indexing and the format
297           for fission (.dwo/.dwp) files. Users    295           for fission (.dwo/.dwp) files. Users may not want to select this
298           config if they rely on tooling that     296           config if they rely on tooling that has not yet been updated to
299           support DWARF Version 5.                297           support DWARF Version 5.
300                                                   298 
301 endchoice # "Debug information"                   299 endchoice # "Debug information"
302                                                   300 
303 if DEBUG_INFO                                     301 if DEBUG_INFO
304                                                   302 
305 config DEBUG_INFO_REDUCED                         303 config DEBUG_INFO_REDUCED
306         bool "Reduce debugging information"       304         bool "Reduce debugging information"
307         help                                      305         help
308           If you say Y here gcc is instructed     306           If you say Y here gcc is instructed to generate less debugging
309           information for structure types. Thi    307           information for structure types. This means that tools that
310           need full debugging information (lik    308           need full debugging information (like kgdb or systemtap) won't
311           be happy. But if you merely need deb    309           be happy. But if you merely need debugging information to
312           resolve line numbers there is no los    310           resolve line numbers there is no loss. Advantage is that
313           build directory object sizes shrink     311           build directory object sizes shrink dramatically over a full
314           DEBUG_INFO build and compile times a    312           DEBUG_INFO build and compile times are reduced too.
315           Only works with newer gcc versions.     313           Only works with newer gcc versions.
316                                                   314 
317 choice                                            315 choice
318         prompt "Compressed Debug information"     316         prompt "Compressed Debug information"
319         help                                      317         help
320           Compress the resulting debug info. R    318           Compress the resulting debug info. Results in smaller debug info sections,
321           but requires that consumers are able    319           but requires that consumers are able to decompress the results.
322                                                   320 
323           If unsure, choose DEBUG_INFO_COMPRES    321           If unsure, choose DEBUG_INFO_COMPRESSED_NONE.
324                                                   322 
325 config DEBUG_INFO_COMPRESSED_NONE                 323 config DEBUG_INFO_COMPRESSED_NONE
326         bool "Don't compress debug information    324         bool "Don't compress debug information"
327         help                                      325         help
328           Don't compress debug info sections.     326           Don't compress debug info sections.
329                                                   327 
330 config DEBUG_INFO_COMPRESSED_ZLIB                 328 config DEBUG_INFO_COMPRESSED_ZLIB
331         bool "Compress debugging information w    329         bool "Compress debugging information with zlib"
332         depends on $(cc-option,-gz=zlib)          330         depends on $(cc-option,-gz=zlib)
333         depends on $(ld-option,--compress-debu    331         depends on $(ld-option,--compress-debug-sections=zlib)
334         help                                      332         help
335           Compress the debug information using    333           Compress the debug information using zlib.  Requires GCC 5.0+ or Clang
336           5.0+, binutils 2.26+, and zlib.         334           5.0+, binutils 2.26+, and zlib.
337                                                   335 
338           Users of dpkg-deb via scripts/packag    336           Users of dpkg-deb via scripts/package/builddeb may find an increase in
339           size of their debug .deb packages wi    337           size of their debug .deb packages with this config set, due to the
340           debug info being compressed with zli    338           debug info being compressed with zlib, then the object files being
341           recompressed with a different compre    339           recompressed with a different compression scheme. But this is still
342           preferable to setting $KDEB_COMPRESS    340           preferable to setting $KDEB_COMPRESS to "none" which would be even
343           larger.                                 341           larger.
344                                                   342 
345 config DEBUG_INFO_COMPRESSED_ZSTD                 343 config DEBUG_INFO_COMPRESSED_ZSTD
346         bool "Compress debugging information w    344         bool "Compress debugging information with zstd"
347         depends on $(cc-option,-gz=zstd)          345         depends on $(cc-option,-gz=zstd)
348         depends on $(ld-option,--compress-debu    346         depends on $(ld-option,--compress-debug-sections=zstd)
349         help                                      347         help
350           Compress the debug information using    348           Compress the debug information using zstd.  This may provide better
351           compression than zlib, for about the    349           compression than zlib, for about the same time costs, but requires newer
352           toolchain support.  Requires GCC 13.    350           toolchain support.  Requires GCC 13.0+ or Clang 16.0+, binutils 2.40+, and
353           zstd.                                   351           zstd.
354                                                   352 
355 endchoice # "Compressed Debug information"        353 endchoice # "Compressed Debug information"
356                                                   354 
357 config DEBUG_INFO_SPLIT                           355 config DEBUG_INFO_SPLIT
358         bool "Produce split debuginfo in .dwo     356         bool "Produce split debuginfo in .dwo files"
359         depends on $(cc-option,-gsplit-dwarf)     357         depends on $(cc-option,-gsplit-dwarf)
360         # RISC-V linker relaxation + -gsplit-d    358         # RISC-V linker relaxation + -gsplit-dwarf has issues with LLVM and GCC
361         # prior to 12.x:                          359         # prior to 12.x:
362         # https://github.com/llvm/llvm-project    360         # https://github.com/llvm/llvm-project/issues/56642
363         # https://gcc.gnu.org/bugzilla/show_bu    361         # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99090
364         depends on !RISCV || GCC_VERSION >= 12    362         depends on !RISCV || GCC_VERSION >= 120000
365         help                                      363         help
366           Generate debug info into separate .d    364           Generate debug info into separate .dwo files. This significantly
367           reduces the build directory size for    365           reduces the build directory size for builds with DEBUG_INFO,
368           because it stores the information on    366           because it stores the information only once on disk in .dwo
369           files instead of multiple times in o    367           files instead of multiple times in object files and executables.
370           In addition the debug information is    368           In addition the debug information is also compressed.
371                                                   369 
372           Requires recent gcc (4.7+) and recen    370           Requires recent gcc (4.7+) and recent gdb/binutils.
373           Any tool that packages or reads debu    371           Any tool that packages or reads debug information would need
374           to know about the .dwo files and inc    372           to know about the .dwo files and include them.
375           Incompatible with older versions of     373           Incompatible with older versions of ccache.
376                                                   374 
377 config DEBUG_INFO_BTF                             375 config DEBUG_INFO_BTF
378         bool "Generate BTF type information"      376         bool "Generate BTF type information"
379         depends on !DEBUG_INFO_SPLIT && !DEBUG    377         depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
380         depends on !GCC_PLUGIN_RANDSTRUCT || C    378         depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
381         depends on BPF_SYSCALL                    379         depends on BPF_SYSCALL
382         depends on !DEBUG_INFO_DWARF5 || PAHOL    380         depends on !DEBUG_INFO_DWARF5 || PAHOLE_VERSION >= 121
383         # pahole uses elfutils, which does not << 
384         depends on !HEXAGON                    << 
385         help                                      381         help
386           Generate deduplicated BTF type infor    382           Generate deduplicated BTF type information from DWARF debug info.
387           Turning this on expects presence of     383           Turning this on expects presence of pahole tool, which will convert
388           DWARF type info into equivalent dedu    384           DWARF type info into equivalent deduplicated BTF type info.
389                                                   385 
390 config PAHOLE_HAS_SPLIT_BTF                       386 config PAHOLE_HAS_SPLIT_BTF
391         def_bool PAHOLE_VERSION >= 119            387         def_bool PAHOLE_VERSION >= 119
392                                                   388 
393 config PAHOLE_HAS_BTF_TAG                         389 config PAHOLE_HAS_BTF_TAG
394         def_bool PAHOLE_VERSION >= 123            390         def_bool PAHOLE_VERSION >= 123
395         depends on CC_IS_CLANG                    391         depends on CC_IS_CLANG
396         help                                      392         help
397           Decide whether pahole emits btf_tag     393           Decide whether pahole emits btf_tag attributes (btf_type_tag and
398           btf_decl_tag) or not. Currently only    394           btf_decl_tag) or not. Currently only clang compiler implements
399           these attributes, so make the config    395           these attributes, so make the config depend on CC_IS_CLANG.
400                                                   396 
401 config PAHOLE_HAS_LANG_EXCLUDE                    397 config PAHOLE_HAS_LANG_EXCLUDE
402         def_bool PAHOLE_VERSION >= 124            398         def_bool PAHOLE_VERSION >= 124
403         help                                      399         help
404           Support for the --lang_exclude flag     400           Support for the --lang_exclude flag which makes pahole exclude
405           compilation units from the supplied     401           compilation units from the supplied language. Used in Kbuild to
406           omit Rust CUs which are not supporte    402           omit Rust CUs which are not supported in version 1.24 of pahole,
407           otherwise it would emit malformed ke    403           otherwise it would emit malformed kernel and module binaries when
408           using DEBUG_INFO_BTF_MODULES.           404           using DEBUG_INFO_BTF_MODULES.
409                                                   405 
410 config DEBUG_INFO_BTF_MODULES                     406 config DEBUG_INFO_BTF_MODULES
411         bool "Generate BTF type information fo    407         bool "Generate BTF type information for kernel modules"
412         default y                                 408         default y
413         depends on DEBUG_INFO_BTF && MODULES &    409         depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF
414         help                                      410         help
415           Generate compact split BTF type info    411           Generate compact split BTF type information for kernel modules.
416                                                   412 
417 config MODULE_ALLOW_BTF_MISMATCH                  413 config MODULE_ALLOW_BTF_MISMATCH
418         bool "Allow loading modules with non-m    414         bool "Allow loading modules with non-matching BTF type info"
419         depends on DEBUG_INFO_BTF_MODULES         415         depends on DEBUG_INFO_BTF_MODULES
420         help                                      416         help
421           For modules whose split BTF does not    417           For modules whose split BTF does not match vmlinux, load without
422           BTF rather than refusing to load. Th    418           BTF rather than refusing to load. The default behavior with
423           module BTF enabled is to reject modu    419           module BTF enabled is to reject modules with such mismatches;
424           this option will still load module B    420           this option will still load module BTF where possible but ignore
425           it when a mismatch is found.            421           it when a mismatch is found.
426                                                   422 
427 config GDB_SCRIPTS                                423 config GDB_SCRIPTS
428         bool "Provide GDB scripts for kernel d    424         bool "Provide GDB scripts for kernel debugging"
429         help                                      425         help
430           This creates the required links to G    426           This creates the required links to GDB helper scripts in the
431           build directory. If you load vmlinux    427           build directory. If you load vmlinux into gdb, the helper
432           scripts will be automatically import    428           scripts will be automatically imported by gdb as well, and
433           additional functions are available t    429           additional functions are available to analyze a Linux kernel
434           instance. See Documentation/dev-tool    430           instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
435           for further details.                    431           for further details.
436                                                   432 
437 endif # DEBUG_INFO                                433 endif # DEBUG_INFO
438                                                   434 
439 config FRAME_WARN                                 435 config FRAME_WARN
440         int "Warn for stack frames larger than    436         int "Warn for stack frames larger than"
441         range 0 8192                              437         range 0 8192
442         default 0 if KMSAN                        438         default 0 if KMSAN
443         default 2048 if GCC_PLUGIN_LATENT_ENTR    439         default 2048 if GCC_PLUGIN_LATENT_ENTROPY
444         default 2048 if PARISC                    440         default 2048 if PARISC
445         default 1536 if (!64BIT && XTENSA)        441         default 1536 if (!64BIT && XTENSA)
446         default 1280 if KASAN && !64BIT           442         default 1280 if KASAN && !64BIT
447         default 1024 if !64BIT                    443         default 1024 if !64BIT
448         default 2048 if 64BIT                     444         default 2048 if 64BIT
449         help                                      445         help
450           Tell the compiler to warn at build t    446           Tell the compiler to warn at build time for stack frames larger than this.
451           Setting this too low will cause a lo    447           Setting this too low will cause a lot of warnings.
452           Setting it to 0 disables the warning    448           Setting it to 0 disables the warning.
453                                                   449 
454 config STRIP_ASM_SYMS                             450 config STRIP_ASM_SYMS
455         bool "Strip assembler-generated symbol    451         bool "Strip assembler-generated symbols during link"
456         default n                                 452         default n
457         help                                      453         help
458           Strip internal assembler-generated s    454           Strip internal assembler-generated symbols during a link (symbols
459           that look like '.Lxxx') so they don'    455           that look like '.Lxxx') so they don't pollute the output of
460           get_wchan() and suchlike.               456           get_wchan() and suchlike.
461                                                   457 
462 config READABLE_ASM                               458 config READABLE_ASM
463         bool "Generate readable assembler code    459         bool "Generate readable assembler code"
464         depends on DEBUG_KERNEL                   460         depends on DEBUG_KERNEL
465         depends on CC_IS_GCC                      461         depends on CC_IS_GCC
466         help                                      462         help
467           Disable some compiler optimizations     463           Disable some compiler optimizations that tend to generate human unreadable
468           assembler output. This may make the     464           assembler output. This may make the kernel slightly slower, but it helps
469           to keep kernel developers who have t    465           to keep kernel developers who have to stare a lot at assembler listings
470           sane.                                   466           sane.
471                                                   467 
472 config HEADERS_INSTALL                            468 config HEADERS_INSTALL
473         bool "Install uapi headers to usr/incl    469         bool "Install uapi headers to usr/include"
474         depends on !UML                           470         depends on !UML
475         help                                      471         help
476           This option will install uapi header    472           This option will install uapi headers (headers exported to user-space)
477           into the usr/include directory for u    473           into the usr/include directory for use during the kernel build.
478           This is unneeded for building the ke    474           This is unneeded for building the kernel itself, but needed for some
479           user-space program samples. It is al    475           user-space program samples. It is also needed by some features such
480           as uapi header sanity checks.           476           as uapi header sanity checks.
481                                                   477 
482 config DEBUG_SECTION_MISMATCH                     478 config DEBUG_SECTION_MISMATCH
483         bool "Enable full Section mismatch ana    479         bool "Enable full Section mismatch analysis"
484         depends on CC_IS_GCC                      480         depends on CC_IS_GCC
485         help                                      481         help
486           The section mismatch analysis checks    482           The section mismatch analysis checks if there are illegal
487           references from one section to anoth    483           references from one section to another section.
488           During linktime or runtime, some sec    484           During linktime or runtime, some sections are dropped;
489           any use of code/data previously in t    485           any use of code/data previously in these sections would
490           most likely result in an oops.          486           most likely result in an oops.
491           In the code, functions and variables    487           In the code, functions and variables are annotated with
492           __init,, etc. (see the full list in     488           __init,, etc. (see the full list in include/linux/init.h),
493           which results in the code/data being    489           which results in the code/data being placed in specific sections.
494           The section mismatch analysis is alw    490           The section mismatch analysis is always performed after a full
495           kernel build, and enabling this opti    491           kernel build, and enabling this option causes the following
496           additional step to occur:               492           additional step to occur:
497           - Add the option -fno-inline-functio    493           - Add the option -fno-inline-functions-called-once to gcc commands.
498             When inlining a function annotated    494             When inlining a function annotated with __init in a non-init
499             function, we would lose the sectio    495             function, we would lose the section information and thus
500             the analysis would not catch the i    496             the analysis would not catch the illegal reference.
501             This option tells gcc to inline le    497             This option tells gcc to inline less (but it does result in
502             a larger kernel).                     498             a larger kernel).
503                                                   499 
504 config SECTION_MISMATCH_WARN_ONLY                 500 config SECTION_MISMATCH_WARN_ONLY
505         bool "Make section mismatch errors non    501         bool "Make section mismatch errors non-fatal"
506         default y                                 502         default y
507         help                                      503         help
508           If you say N here, the build process    504           If you say N here, the build process will fail if there are any
509           section mismatch, instead of just th    505           section mismatch, instead of just throwing warnings.
510                                                   506 
511           If unsure, say Y.                       507           If unsure, say Y.
512                                                   508 
513 config DEBUG_FORCE_FUNCTION_ALIGN_64B             509 config DEBUG_FORCE_FUNCTION_ALIGN_64B
514         bool "Force all function address 64B a    510         bool "Force all function address 64B aligned"
515         depends on EXPERT && (X86_64 || ARM64     511         depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC || RISCV || S390)
516         select FUNCTION_ALIGNMENT_64B             512         select FUNCTION_ALIGNMENT_64B
517         help                                      513         help
518           There are cases that a commit from o    514           There are cases that a commit from one domain changes the function
519           address alignment of other domains,     515           address alignment of other domains, and cause magic performance
520           bump (regression or improvement). En    516           bump (regression or improvement). Enable this option will help to
521           verify if the bump is caused by func    517           verify if the bump is caused by function alignment changes, while
522           it will slightly increase the kernel    518           it will slightly increase the kernel size and affect icache usage.
523                                                   519 
524           It is mainly for debug and performan    520           It is mainly for debug and performance tuning use.
525                                                   521 
526 #                                                 522 #
527 # Select this config option from the architect    523 # Select this config option from the architecture Kconfig, if it
528 # is preferred to always offer frame pointers     524 # is preferred to always offer frame pointers as a config
529 # option on the architecture (regardless of KE    525 # option on the architecture (regardless of KERNEL_DEBUG):
530 #                                                 526 #
531 config ARCH_WANT_FRAME_POINTERS                   527 config ARCH_WANT_FRAME_POINTERS
532         bool                                      528         bool
533                                                   529 
534 config FRAME_POINTER                              530 config FRAME_POINTER
535         bool "Compile the kernel with frame po    531         bool "Compile the kernel with frame pointers"
536         depends on DEBUG_KERNEL && (M68K || UM    532         depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS
537         default y if (DEBUG_INFO && UML) || AR    533         default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
538         help                                      534         help
539           If you say Y here the resulting kern    535           If you say Y here the resulting kernel image will be slightly
540           larger and slower, but it gives very    536           larger and slower, but it gives very useful debugging information
541           in case of kernel bugs. (precise oop    537           in case of kernel bugs. (precise oopses/stacktraces/warnings)
542                                                   538 
543 config OBJTOOL                                    539 config OBJTOOL
544         bool                                      540         bool
545                                                   541 
546 config STACK_VALIDATION                           542 config STACK_VALIDATION
547         bool "Compile-time stack metadata vali    543         bool "Compile-time stack metadata validation"
548         depends on HAVE_STACK_VALIDATION && UN    544         depends on HAVE_STACK_VALIDATION && UNWINDER_FRAME_POINTER
549         select OBJTOOL                            545         select OBJTOOL
550         default n                                 546         default n
551         help                                      547         help
552           Validate frame pointer rules at comp    548           Validate frame pointer rules at compile-time.  This helps ensure that
553           runtime stack traces are more reliab    549           runtime stack traces are more reliable.
554                                                   550 
555           For more information, see               551           For more information, see
556           tools/objtool/Documentation/objtool.    552           tools/objtool/Documentation/objtool.txt.
557                                                   553 
558 config NOINSTR_VALIDATION                         554 config NOINSTR_VALIDATION
559         bool                                      555         bool
560         depends on HAVE_NOINSTR_VALIDATION &&     556         depends on HAVE_NOINSTR_VALIDATION && DEBUG_ENTRY
561         select OBJTOOL                            557         select OBJTOOL
562         default y                                 558         default y
563                                                   559 
564 config VMLINUX_MAP                                560 config VMLINUX_MAP
565         bool "Generate vmlinux.map file when l    561         bool "Generate vmlinux.map file when linking"
566         depends on EXPERT                         562         depends on EXPERT
567         help                                      563         help
568           Selecting this option will pass "-Ma    564           Selecting this option will pass "-Map=vmlinux.map" to ld
569           when linking vmlinux. That file can     565           when linking vmlinux. That file can be useful for verifying
570           and debugging magic section games, a    566           and debugging magic section games, and for seeing which
571           pieces of code get eliminated with      567           pieces of code get eliminated with
572           CONFIG_LD_DEAD_CODE_DATA_ELIMINATION    568           CONFIG_LD_DEAD_CODE_DATA_ELIMINATION.
573                                                   569 
574 config DEBUG_FORCE_WEAK_PER_CPU                   570 config DEBUG_FORCE_WEAK_PER_CPU
575         bool "Force weak per-cpu definitions"     571         bool "Force weak per-cpu definitions"
576         depends on DEBUG_KERNEL                   572         depends on DEBUG_KERNEL
577         help                                      573         help
578           s390 and alpha require percpu variab    574           s390 and alpha require percpu variables in modules to be
579           defined weak to work around addressi    575           defined weak to work around addressing range issue which
580           puts the following two restrictions     576           puts the following two restrictions on percpu variable
581           definitions.                            577           definitions.
582                                                   578 
583           1. percpu symbols must be unique whe    579           1. percpu symbols must be unique whether static or not
584           2. percpu variables can't be defined    580           2. percpu variables can't be defined inside a function
585                                                   581 
586           To ensure that generic code follows     582           To ensure that generic code follows the above rules, this
587           option forces all percpu variables t    583           option forces all percpu variables to be defined as weak.
588                                                   584 
589 endmenu # "Compiler options"                      585 endmenu # "Compiler options"
590                                                   586 
591 menu "Generic Kernel Debugging Instruments"       587 menu "Generic Kernel Debugging Instruments"
592                                                   588 
593 config MAGIC_SYSRQ                                589 config MAGIC_SYSRQ
594         bool "Magic SysRq key"                    590         bool "Magic SysRq key"
595         depends on !UML                           591         depends on !UML
596         help                                      592         help
597           If you say Y here, you will have som    593           If you say Y here, you will have some control over the system even
598           if the system crashes for example du    594           if the system crashes for example during kernel debugging (e.g., you
599           will be able to flush the buffer cac    595           will be able to flush the buffer cache to disk, reboot the system
600           immediately or dump some status info    596           immediately or dump some status information). This is accomplished
601           by pressing various keys while holdi    597           by pressing various keys while holding SysRq (Alt+PrintScreen). It
602           also works on a serial console (on P    598           also works on a serial console (on PC hardware at least), if you
603           send a BREAK and then within 5 secon    599           send a BREAK and then within 5 seconds a command keypress. The
604           keys are documented in <file:Documen    600           keys are documented in <file:Documentation/admin-guide/sysrq.rst>.
605           Don't say Y unless you really know w    601           Don't say Y unless you really know what this hack does.
606                                                   602 
607 config MAGIC_SYSRQ_DEFAULT_ENABLE                 603 config MAGIC_SYSRQ_DEFAULT_ENABLE
608         hex "Enable magic SysRq key functions     604         hex "Enable magic SysRq key functions by default"
609         depends on MAGIC_SYSRQ                    605         depends on MAGIC_SYSRQ
610         default 0x1                               606         default 0x1
611         help                                      607         help
612           Specifies which SysRq key functions     608           Specifies which SysRq key functions are enabled by default.
613           This may be set to 1 or 0 to enable     609           This may be set to 1 or 0 to enable or disable them all, or
614           to a bitmask as described in Documen    610           to a bitmask as described in Documentation/admin-guide/sysrq.rst.
615                                                   611 
616 config MAGIC_SYSRQ_SERIAL                         612 config MAGIC_SYSRQ_SERIAL
617         bool "Enable magic SysRq key over seri    613         bool "Enable magic SysRq key over serial"
618         depends on MAGIC_SYSRQ                    614         depends on MAGIC_SYSRQ
619         default y                                 615         default y
620         help                                      616         help
621           Many embedded boards have a disconne    617           Many embedded boards have a disconnected TTL level serial which can
622           generate some garbage that can lead     618           generate some garbage that can lead to spurious false sysrq detects.
623           This option allows you to decide whe    619           This option allows you to decide whether you want to enable the
624           magic SysRq key.                        620           magic SysRq key.
625                                                   621 
626 config MAGIC_SYSRQ_SERIAL_SEQUENCE                622 config MAGIC_SYSRQ_SERIAL_SEQUENCE
627         string "Char sequence that enables mag    623         string "Char sequence that enables magic SysRq over serial"
628         depends on MAGIC_SYSRQ_SERIAL             624         depends on MAGIC_SYSRQ_SERIAL
629         default ""                                625         default ""
630         help                                      626         help
631           Specifies a sequence of characters t    627           Specifies a sequence of characters that can follow BREAK to enable
632           SysRq on a serial console.              628           SysRq on a serial console.
633                                                   629 
634           If unsure, leave an empty string and    630           If unsure, leave an empty string and the option will not be enabled.
635                                                   631 
636 config DEBUG_FS                                   632 config DEBUG_FS
637         bool "Debug Filesystem"                   633         bool "Debug Filesystem"
638         help                                      634         help
639           debugfs is a virtual file system tha    635           debugfs is a virtual file system that kernel developers use to put
640           debugging files into.  Enable this o    636           debugging files into.  Enable this option to be able to read and
641           write to these files.                   637           write to these files.
642                                                   638 
643           For detailed documentation on the de    639           For detailed documentation on the debugfs API, see
644           Documentation/filesystems/.             640           Documentation/filesystems/.
645                                                   641 
646           If unsure, say N.                       642           If unsure, say N.
647                                                   643 
648 choice                                            644 choice
649         prompt "Debugfs default access"           645         prompt "Debugfs default access"
650         depends on DEBUG_FS                       646         depends on DEBUG_FS
651         default DEBUG_FS_ALLOW_ALL                647         default DEBUG_FS_ALLOW_ALL
652         help                                      648         help
653           This selects the default access rest    649           This selects the default access restrictions for debugfs.
654           It can be overridden with kernel com    650           It can be overridden with kernel command line option
655           debugfs=[on,no-mount,off]. The restr    651           debugfs=[on,no-mount,off]. The restrictions apply for API access
656           and filesystem registration.            652           and filesystem registration.
657                                                   653 
658 config DEBUG_FS_ALLOW_ALL                         654 config DEBUG_FS_ALLOW_ALL
659         bool "Access normal"                      655         bool "Access normal"
660         help                                      656         help
661           No restrictions apply. Both API and     657           No restrictions apply. Both API and filesystem registration
662           is on. This is the normal default op    658           is on. This is the normal default operation.
663                                                   659 
664 config DEBUG_FS_DISALLOW_MOUNT                    660 config DEBUG_FS_DISALLOW_MOUNT
665         bool "Do not register debugfs as files    661         bool "Do not register debugfs as filesystem"
666         help                                      662         help
667           The API is open but filesystem is no    663           The API is open but filesystem is not loaded. Clients can still do
668           their work and read with debug tools    664           their work and read with debug tools that do not need
669           debugfs filesystem.                     665           debugfs filesystem.
670                                                   666 
671 config DEBUG_FS_ALLOW_NONE                        667 config DEBUG_FS_ALLOW_NONE
672         bool "No access"                          668         bool "No access"
673         help                                      669         help
674           Access is off. Clients get -PERM whe    670           Access is off. Clients get -PERM when trying to create nodes in
675           debugfs tree and debugfs is not regi    671           debugfs tree and debugfs is not registered as a filesystem.
676           Client can then back-off or continue    672           Client can then back-off or continue without debugfs access.
677                                                   673 
678 endchoice                                         674 endchoice
679                                                   675 
680 source "lib/Kconfig.kgdb"                         676 source "lib/Kconfig.kgdb"
681 source "lib/Kconfig.ubsan"                        677 source "lib/Kconfig.ubsan"
682 source "lib/Kconfig.kcsan"                        678 source "lib/Kconfig.kcsan"
683                                                   679 
684 endmenu                                           680 endmenu
685                                                   681 
686 menu "Networking Debugging"                       682 menu "Networking Debugging"
687                                                   683 
688 source "net/Kconfig.debug"                        684 source "net/Kconfig.debug"
689                                                   685 
690 endmenu # "Networking Debugging"                  686 endmenu # "Networking Debugging"
691                                                   687 
692 menu "Memory Debugging"                           688 menu "Memory Debugging"
693                                                   689 
694 source "mm/Kconfig.debug"                         690 source "mm/Kconfig.debug"
695                                                   691 
696 config DEBUG_OBJECTS                              692 config DEBUG_OBJECTS
697         bool "Debug object operations"            693         bool "Debug object operations"
698         depends on DEBUG_KERNEL                   694         depends on DEBUG_KERNEL
699         help                                      695         help
700           If you say Y here, additional code w    696           If you say Y here, additional code will be inserted into the
701           kernel to track the life time of var    697           kernel to track the life time of various objects and validate
702           the operations on those objects.        698           the operations on those objects.
703                                                   699 
704 config DEBUG_OBJECTS_SELFTEST                     700 config DEBUG_OBJECTS_SELFTEST
705         bool "Debug objects selftest"             701         bool "Debug objects selftest"
706         depends on DEBUG_OBJECTS                  702         depends on DEBUG_OBJECTS
707         help                                      703         help
708           This enables the selftest of the obj    704           This enables the selftest of the object debug code.
709                                                   705 
710 config DEBUG_OBJECTS_FREE                         706 config DEBUG_OBJECTS_FREE
711         bool "Debug objects in freed memory"      707         bool "Debug objects in freed memory"
712         depends on DEBUG_OBJECTS                  708         depends on DEBUG_OBJECTS
713         help                                      709         help
714           This enables checks whether a k/v fr    710           This enables checks whether a k/v free operation frees an area
715           which contains an object which has n    711           which contains an object which has not been deactivated
716           properly. This can make kmalloc/kfre    712           properly. This can make kmalloc/kfree-intensive workloads
717           much slower.                            713           much slower.
718                                                   714 
719 config DEBUG_OBJECTS_TIMERS                       715 config DEBUG_OBJECTS_TIMERS
720         bool "Debug timer objects"                716         bool "Debug timer objects"
721         depends on DEBUG_OBJECTS                  717         depends on DEBUG_OBJECTS
722         help                                      718         help
723           If you say Y here, additional code w    719           If you say Y here, additional code will be inserted into the
724           timer routines to track the life tim    720           timer routines to track the life time of timer objects and
725           validate the timer operations.          721           validate the timer operations.
726                                                   722 
727 config DEBUG_OBJECTS_WORK                         723 config DEBUG_OBJECTS_WORK
728         bool "Debug work objects"                 724         bool "Debug work objects"
729         depends on DEBUG_OBJECTS                  725         depends on DEBUG_OBJECTS
730         help                                      726         help
731           If you say Y here, additional code w    727           If you say Y here, additional code will be inserted into the
732           work queue routines to track the lif    728           work queue routines to track the life time of work objects and
733           validate the work operations.           729           validate the work operations.
734                                                   730 
735 config DEBUG_OBJECTS_RCU_HEAD                     731 config DEBUG_OBJECTS_RCU_HEAD
736         bool "Debug RCU callbacks objects"        732         bool "Debug RCU callbacks objects"
737         depends on DEBUG_OBJECTS                  733         depends on DEBUG_OBJECTS
738         help                                      734         help
739           Enable this to turn on debugging of     735           Enable this to turn on debugging of RCU list heads (call_rcu() usage).
740                                                   736 
741 config DEBUG_OBJECTS_PERCPU_COUNTER               737 config DEBUG_OBJECTS_PERCPU_COUNTER
742         bool "Debug percpu counter objects"       738         bool "Debug percpu counter objects"
743         depends on DEBUG_OBJECTS                  739         depends on DEBUG_OBJECTS
744         help                                      740         help
745           If you say Y here, additional code w    741           If you say Y here, additional code will be inserted into the
746           percpu counter routines to track the    742           percpu counter routines to track the life time of percpu counter
747           objects and validate the percpu coun    743           objects and validate the percpu counter operations.
748                                                   744 
749 config DEBUG_OBJECTS_ENABLE_DEFAULT               745 config DEBUG_OBJECTS_ENABLE_DEFAULT
750         int "debug_objects bootup default valu    746         int "debug_objects bootup default value (0-1)"
751         range 0 1                                 747         range 0 1
752         default "1"                               748         default "1"
753         depends on DEBUG_OBJECTS                  749         depends on DEBUG_OBJECTS
754         help                                      750         help
755           Debug objects boot parameter default    751           Debug objects boot parameter default value
756                                                   752 
757 config SHRINKER_DEBUG                             753 config SHRINKER_DEBUG
758         bool "Enable shrinker debugging suppor    754         bool "Enable shrinker debugging support"
759         depends on DEBUG_FS                       755         depends on DEBUG_FS
760         help                                      756         help
761           Say Y to enable the shrinker debugfs    757           Say Y to enable the shrinker debugfs interface which provides
762           visibility into the kernel memory sh    758           visibility into the kernel memory shrinkers subsystem.
763           Disable it to avoid an extra memory     759           Disable it to avoid an extra memory footprint.
764                                                   760 
765 config DEBUG_STACK_USAGE                          761 config DEBUG_STACK_USAGE
766         bool "Stack utilization instrumentatio    762         bool "Stack utilization instrumentation"
767         depends on DEBUG_KERNEL                !! 763         depends on DEBUG_KERNEL && !IA64
768         help                                      764         help
769           Enables the display of the minimum a    765           Enables the display of the minimum amount of free stack which each
770           task has ever had available in the s    766           task has ever had available in the sysrq-T and sysrq-P debug output.
771           Also emits a message to dmesg when a << 
772           used more stack space than previousl << 
773                                                   767 
774           This option will slow down process c    768           This option will slow down process creation somewhat.
775                                                   769 
776 config SCHED_STACK_END_CHECK                      770 config SCHED_STACK_END_CHECK
777         bool "Detect stack corruption on calls    771         bool "Detect stack corruption on calls to schedule()"
778         depends on DEBUG_KERNEL                   772         depends on DEBUG_KERNEL
779         default n                                 773         default n
780         help                                      774         help
781           This option checks for a stack overr    775           This option checks for a stack overrun on calls to schedule().
782           If the stack end location is found t    776           If the stack end location is found to be over written always panic as
783           the content of the corrupted region     777           the content of the corrupted region can no longer be trusted.
784           This is to ensure no erroneous behav    778           This is to ensure no erroneous behaviour occurs which could result in
785           data corruption or a sporadic crash     779           data corruption or a sporadic crash at a later stage once the region
786           is examined. The runtime overhead in    780           is examined. The runtime overhead introduced is minimal.
787                                                   781 
788 config ARCH_HAS_DEBUG_VM_PGTABLE                  782 config ARCH_HAS_DEBUG_VM_PGTABLE
789         bool                                      783         bool
790         help                                      784         help
791           An architecture should select this w    785           An architecture should select this when it can successfully
792           build and run DEBUG_VM_PGTABLE.         786           build and run DEBUG_VM_PGTABLE.
793                                                   787 
794 config DEBUG_VM_IRQSOFF                           788 config DEBUG_VM_IRQSOFF
795         def_bool DEBUG_VM && !PREEMPT_RT          789         def_bool DEBUG_VM && !PREEMPT_RT
796                                                   790 
797 config DEBUG_VM                                   791 config DEBUG_VM
798         bool "Debug VM"                           792         bool "Debug VM"
799         depends on DEBUG_KERNEL                   793         depends on DEBUG_KERNEL
800         help                                      794         help
801           Enable this to turn on extended chec    795           Enable this to turn on extended checks in the virtual-memory system
802           that may impact performance.            796           that may impact performance.
803                                                   797 
804           If unsure, say N.                       798           If unsure, say N.
805                                                   799 
806 config DEBUG_VM_SHOOT_LAZIES                      800 config DEBUG_VM_SHOOT_LAZIES
807         bool "Debug MMU_LAZY_TLB_SHOOTDOWN imp    801         bool "Debug MMU_LAZY_TLB_SHOOTDOWN implementation"
808         depends on DEBUG_VM                       802         depends on DEBUG_VM
809         depends on MMU_LAZY_TLB_SHOOTDOWN         803         depends on MMU_LAZY_TLB_SHOOTDOWN
810         help                                      804         help
811           Enable additional IPIs that ensure l    805           Enable additional IPIs that ensure lazy tlb mm references are removed
812           before the mm is freed.                 806           before the mm is freed.
813                                                   807 
814           If unsure, say N.                       808           If unsure, say N.
815                                                   809 
816 config DEBUG_VM_MAPLE_TREE                        810 config DEBUG_VM_MAPLE_TREE
817         bool "Debug VM maple trees"               811         bool "Debug VM maple trees"
818         depends on DEBUG_VM                       812         depends on DEBUG_VM
819         select DEBUG_MAPLE_TREE                   813         select DEBUG_MAPLE_TREE
820         help                                      814         help
821           Enable VM maple tree debugging infor    815           Enable VM maple tree debugging information and extra validations.
822                                                   816 
823           If unsure, say N.                       817           If unsure, say N.
824                                                   818 
825 config DEBUG_VM_RB                                819 config DEBUG_VM_RB
826         bool "Debug VM red-black trees"           820         bool "Debug VM red-black trees"
827         depends on DEBUG_VM                       821         depends on DEBUG_VM
828         help                                      822         help
829           Enable VM red-black tree debugging i    823           Enable VM red-black tree debugging information and extra validations.
830                                                   824 
831           If unsure, say N.                       825           If unsure, say N.
832                                                   826 
833 config DEBUG_VM_PGFLAGS                           827 config DEBUG_VM_PGFLAGS
834         bool "Debug page-flags operations"        828         bool "Debug page-flags operations"
835         depends on DEBUG_VM                       829         depends on DEBUG_VM
836         help                                      830         help
837           Enables extra validation on page fla    831           Enables extra validation on page flags operations.
838                                                   832 
839           If unsure, say N.                       833           If unsure, say N.
840                                                   834 
841 config DEBUG_VM_PGTABLE                           835 config DEBUG_VM_PGTABLE
842         bool "Debug arch page table for semant    836         bool "Debug arch page table for semantics compliance"
843         depends on MMU                            837         depends on MMU
844         depends on ARCH_HAS_DEBUG_VM_PGTABLE      838         depends on ARCH_HAS_DEBUG_VM_PGTABLE
845         default y if DEBUG_VM                     839         default y if DEBUG_VM
846         help                                      840         help
847           This option provides a debug method     841           This option provides a debug method which can be used to test
848           architecture page table helper funct    842           architecture page table helper functions on various platforms in
849           verifying if they comply with expect    843           verifying if they comply with expected generic MM semantics. This
850           will help architecture code in makin    844           will help architecture code in making sure that any changes or
851           new additions of these helpers still    845           new additions of these helpers still conform to expected
852           semantics of the generic MM. Platfor    846           semantics of the generic MM. Platforms will have to opt in for
853           this through ARCH_HAS_DEBUG_VM_PGTAB    847           this through ARCH_HAS_DEBUG_VM_PGTABLE.
854                                                   848 
855           If unsure, say N.                       849           If unsure, say N.
856                                                   850 
857 config ARCH_HAS_DEBUG_VIRTUAL                     851 config ARCH_HAS_DEBUG_VIRTUAL
858         bool                                      852         bool
859                                                   853 
860 config DEBUG_VIRTUAL                              854 config DEBUG_VIRTUAL
861         bool "Debug VM translations"              855         bool "Debug VM translations"
862         depends on DEBUG_KERNEL && ARCH_HAS_DE    856         depends on DEBUG_KERNEL && ARCH_HAS_DEBUG_VIRTUAL
863         help                                      857         help
864           Enable some costly sanity checks in     858           Enable some costly sanity checks in virtual to page code. This can
865           catch mistakes with virt_to_page() a    859           catch mistakes with virt_to_page() and friends.
866                                                   860 
867           If unsure, say N.                       861           If unsure, say N.
868                                                   862 
869 config DEBUG_NOMMU_REGIONS                        863 config DEBUG_NOMMU_REGIONS
870         bool "Debug the global anon/private NO    864         bool "Debug the global anon/private NOMMU mapping region tree"
871         depends on DEBUG_KERNEL && !MMU           865         depends on DEBUG_KERNEL && !MMU
872         help                                      866         help
873           This option causes the global tree o    867           This option causes the global tree of anonymous and private mapping
874           regions to be regularly checked for     868           regions to be regularly checked for invalid topology.
875                                                   869 
876 config DEBUG_MEMORY_INIT                          870 config DEBUG_MEMORY_INIT
877         bool "Debug memory initialisation" if     871         bool "Debug memory initialisation" if EXPERT
878         default !EXPERT                           872         default !EXPERT
879         help                                      873         help
880           Enable this for additional checks du    874           Enable this for additional checks during memory initialisation.
881           The sanity checks verify aspects of     875           The sanity checks verify aspects of the VM such as the memory model
882           and other information provided by th    876           and other information provided by the architecture. Verbose
883           information will be printed at KERN_    877           information will be printed at KERN_DEBUG loglevel depending
884           on the mminit_loglevel= command-line    878           on the mminit_loglevel= command-line option.
885                                                   879 
886           If unsure, say Y                        880           If unsure, say Y
887                                                   881 
888 config MEMORY_NOTIFIER_ERROR_INJECT               882 config MEMORY_NOTIFIER_ERROR_INJECT
889         tristate "Memory hotplug notifier erro    883         tristate "Memory hotplug notifier error injection module"
890         depends on MEMORY_HOTPLUG && NOTIFIER_    884         depends on MEMORY_HOTPLUG && NOTIFIER_ERROR_INJECTION
891         help                                      885         help
892           This option provides the ability to     886           This option provides the ability to inject artificial errors to
893           memory hotplug notifier chain callba    887           memory hotplug notifier chain callbacks.  It is controlled through
894           debugfs interface under /sys/kernel/    888           debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
895                                                   889 
896           If the notifier call chain should be    890           If the notifier call chain should be failed with some events
897           notified, write the error code to "a    891           notified, write the error code to "actions/<notifier event>/error".
898                                                   892 
899           Example: Inject memory hotplug offli    893           Example: Inject memory hotplug offline error (-12 == -ENOMEM)
900                                                   894 
901           # cd /sys/kernel/debug/notifier-erro    895           # cd /sys/kernel/debug/notifier-error-inject/memory
902           # echo -12 > actions/MEM_GOING_OFFLI    896           # echo -12 > actions/MEM_GOING_OFFLINE/error
903           # echo offline > /sys/devices/system    897           # echo offline > /sys/devices/system/memory/memoryXXX/state
904           bash: echo: write error: Cannot allo    898           bash: echo: write error: Cannot allocate memory
905                                                   899 
906           To compile this code as a module, ch    900           To compile this code as a module, choose M here: the module will
907           be called memory-notifier-error-inje    901           be called memory-notifier-error-inject.
908                                                   902 
909           If unsure, say N.                       903           If unsure, say N.
910                                                   904 
911 config DEBUG_PER_CPU_MAPS                         905 config DEBUG_PER_CPU_MAPS
912         bool "Debug access to per_cpu maps"       906         bool "Debug access to per_cpu maps"
913         depends on DEBUG_KERNEL                   907         depends on DEBUG_KERNEL
914         depends on SMP                            908         depends on SMP
915         help                                      909         help
916           Say Y to verify that the per_cpu map    910           Say Y to verify that the per_cpu map being accessed has
917           been set up. This adds a fair amount    911           been set up. This adds a fair amount of code to kernel memory
918           and decreases performance.              912           and decreases performance.
919                                                   913 
920           Say N if unsure.                        914           Say N if unsure.
921                                                   915 
922 config DEBUG_KMAP_LOCAL                           916 config DEBUG_KMAP_LOCAL
923         bool "Debug kmap_local temporary mappi    917         bool "Debug kmap_local temporary mappings"
924         depends on DEBUG_KERNEL && KMAP_LOCAL     918         depends on DEBUG_KERNEL && KMAP_LOCAL
925         help                                      919         help
926           This option enables additional error    920           This option enables additional error checking for the kmap_local
927           infrastructure.  Disable for product    921           infrastructure.  Disable for production use.
928                                                   922 
929 config ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP         923 config ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
930         bool                                      924         bool
931                                                   925 
932 config DEBUG_KMAP_LOCAL_FORCE_MAP                 926 config DEBUG_KMAP_LOCAL_FORCE_MAP
933         bool "Enforce kmap_local temporary map    927         bool "Enforce kmap_local temporary mappings"
934         depends on DEBUG_KERNEL && ARCH_SUPPOR    928         depends on DEBUG_KERNEL && ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
935         select KMAP_LOCAL                         929         select KMAP_LOCAL
936         select DEBUG_KMAP_LOCAL                   930         select DEBUG_KMAP_LOCAL
937         help                                      931         help
938           This option enforces temporary mappi    932           This option enforces temporary mappings through the kmap_local
939           mechanism for non-highmem pages and     933           mechanism for non-highmem pages and on non-highmem systems.
940           Disable this for production systems!    934           Disable this for production systems!
941                                                   935 
942 config DEBUG_HIGHMEM                              936 config DEBUG_HIGHMEM
943         bool "Highmem debugging"                  937         bool "Highmem debugging"
944         depends on DEBUG_KERNEL && HIGHMEM        938         depends on DEBUG_KERNEL && HIGHMEM
945         select DEBUG_KMAP_LOCAL_FORCE_MAP if A    939         select DEBUG_KMAP_LOCAL_FORCE_MAP if ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
946         select DEBUG_KMAP_LOCAL                   940         select DEBUG_KMAP_LOCAL
947         help                                      941         help
948           This option enables additional error    942           This option enables additional error checking for high memory
949           systems.  Disable for production sys    943           systems.  Disable for production systems.
950                                                   944 
951 config HAVE_DEBUG_STACKOVERFLOW                   945 config HAVE_DEBUG_STACKOVERFLOW
952         bool                                      946         bool
953                                                   947 
954 config DEBUG_STACKOVERFLOW                        948 config DEBUG_STACKOVERFLOW
955         bool "Check for stack overflows"          949         bool "Check for stack overflows"
956         depends on DEBUG_KERNEL && HAVE_DEBUG_    950         depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
957         help                                      951         help
958           Say Y here if you want to check for     952           Say Y here if you want to check for overflows of kernel, IRQ
959           and exception stacks (if your archit    953           and exception stacks (if your architecture uses them). This
960           option will show detailed messages i    954           option will show detailed messages if free stack space drops
961           below a certain limit.                  955           below a certain limit.
962                                                   956 
963           These kinds of bugs usually occur wh    957           These kinds of bugs usually occur when call-chains in the
964           kernel get too deep, especially when    958           kernel get too deep, especially when interrupts are
965           involved.                               959           involved.
966                                                   960 
967           Use this in cases where you see appa    961           Use this in cases where you see apparently random memory
968           corruption, especially if it appears    962           corruption, especially if it appears in 'struct thread_info'
969                                                   963 
970           If in doubt, say "N".                   964           If in doubt, say "N".
971                                                   965 
972 config CODE_TAGGING                            << 
973         bool                                   << 
974         select KALLSYMS                        << 
975                                                << 
976 config MEM_ALLOC_PROFILING                     << 
977         bool "Enable memory allocation profili << 
978         default n                              << 
979         depends on PROC_FS                     << 
980         depends on !DEBUG_FORCE_WEAK_PER_CPU   << 
981         select CODE_TAGGING                    << 
982         select PAGE_EXTENSION                  << 
983         select SLAB_OBJ_EXT                    << 
984         help                                   << 
985           Track allocation source code and rec << 
986           initiated at that code location. The << 
987           memory leaks with a low performance  << 
988                                                << 
989 config MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT  << 
990         bool "Enable memory allocation profili << 
991         default y                              << 
992         depends on MEM_ALLOC_PROFILING         << 
993                                                << 
994 config MEM_ALLOC_PROFILING_DEBUG               << 
995         bool "Memory allocation profiler debug << 
996         default n                              << 
997         depends on MEM_ALLOC_PROFILING         << 
998         select MEM_ALLOC_PROFILING_ENABLED_BY_ << 
999         help                                   << 
1000           Adds warnings with helpful error me << 
1001           profiling.                          << 
1002                                               << 
1003 source "lib/Kconfig.kasan"                       966 source "lib/Kconfig.kasan"
1004 source "lib/Kconfig.kfence"                      967 source "lib/Kconfig.kfence"
1005 source "lib/Kconfig.kmsan"                       968 source "lib/Kconfig.kmsan"
1006                                                  969 
1007 endmenu # "Memory Debugging"                     970 endmenu # "Memory Debugging"
1008                                                  971 
1009 config DEBUG_SHIRQ                               972 config DEBUG_SHIRQ
1010         bool "Debug shared IRQ handlers"         973         bool "Debug shared IRQ handlers"
1011         depends on DEBUG_KERNEL                  974         depends on DEBUG_KERNEL
1012         help                                     975         help
1013           Enable this to generate a spurious     976           Enable this to generate a spurious interrupt just before a shared
1014           interrupt handler is deregistered (    977           interrupt handler is deregistered (generating one when registering
1015           is currently disabled). Drivers nee    978           is currently disabled). Drivers need to handle this correctly. Some
1016           don't and need to be caught.           979           don't and need to be caught.
1017                                                  980 
1018 menu "Debug Oops, Lockups and Hangs"             981 menu "Debug Oops, Lockups and Hangs"
1019                                                  982 
1020 config PANIC_ON_OOPS                             983 config PANIC_ON_OOPS
1021         bool "Panic on Oops"                     984         bool "Panic on Oops"
1022         help                                     985         help
1023           Say Y here to enable the kernel to     986           Say Y here to enable the kernel to panic when it oopses. This
1024           has the same effect as setting oops    987           has the same effect as setting oops=panic on the kernel command
1025           line.                                  988           line.
1026                                                  989 
1027           This feature is useful to ensure th    990           This feature is useful to ensure that the kernel does not do
1028           anything erroneous after an oops wh    991           anything erroneous after an oops which could result in data
1029           corruption or other issues.            992           corruption or other issues.
1030                                                  993 
1031           Say N if unsure.                       994           Say N if unsure.
1032                                                  995 
1033 config PANIC_ON_OOPS_VALUE                       996 config PANIC_ON_OOPS_VALUE
1034         int                                      997         int
1035         range 0 1                                998         range 0 1
1036         default 0 if !PANIC_ON_OOPS              999         default 0 if !PANIC_ON_OOPS
1037         default 1 if PANIC_ON_OOPS               1000         default 1 if PANIC_ON_OOPS
1038                                                  1001 
1039 config PANIC_TIMEOUT                             1002 config PANIC_TIMEOUT
1040         int "panic timeout"                      1003         int "panic timeout"
1041         default 0                                1004         default 0
1042         help                                     1005         help
1043           Set the timeout value (in seconds)     1006           Set the timeout value (in seconds) until a reboot occurs when
1044           the kernel panics. If n = 0, then w    1007           the kernel panics. If n = 0, then we wait forever. A timeout
1045           value n > 0 will wait n seconds bef    1008           value n > 0 will wait n seconds before rebooting, while a timeout
1046           value n < 0 will reboot immediately !! 1009           value n < 0 will reboot immediately.
1047           with the kernel command line option << 
1048           /proc/sys/kernel/panic.             << 
1049                                                  1010 
1050 config LOCKUP_DETECTOR                           1011 config LOCKUP_DETECTOR
1051         bool                                     1012         bool
1052                                                  1013 
1053 config SOFTLOCKUP_DETECTOR                       1014 config SOFTLOCKUP_DETECTOR
1054         bool "Detect Soft Lockups"               1015         bool "Detect Soft Lockups"
1055         depends on DEBUG_KERNEL && !S390         1016         depends on DEBUG_KERNEL && !S390
1056         select LOCKUP_DETECTOR                   1017         select LOCKUP_DETECTOR
1057         help                                     1018         help
1058           Say Y here to enable the kernel to     1019           Say Y here to enable the kernel to act as a watchdog to detect
1059           soft lockups.                          1020           soft lockups.
1060                                                  1021 
1061           Softlockups are bugs that cause the    1022           Softlockups are bugs that cause the kernel to loop in kernel
1062           mode for more than 20 seconds, with    1023           mode for more than 20 seconds, without giving other tasks a
1063           chance to run.  The current stack t    1024           chance to run.  The current stack trace is displayed upon
1064           detection and the system will stay     1025           detection and the system will stay locked up.
1065                                                  1026 
1066 config SOFTLOCKUP_DETECTOR_INTR_STORM         << 
1067         bool "Detect Interrupt Storm in Soft  << 
1068         depends on SOFTLOCKUP_DETECTOR && IRQ << 
1069         select GENERIC_IRQ_STAT_SNAPSHOT      << 
1070         default y if NR_CPUS <= 128           << 
1071         help                                  << 
1072           Say Y here to enable the kernel to  << 
1073           during "soft lockups".              << 
1074                                               << 
1075           "soft lockups" can be caused by a v << 
1076           caused by an interrupt storm, then  << 
1077           be on the callstack. To detect this << 
1078           the CPU stats and the interrupt cou << 
1079                                               << 
1080 config BOOTPARAM_SOFTLOCKUP_PANIC                1027 config BOOTPARAM_SOFTLOCKUP_PANIC
1081         bool "Panic (Reboot) On Soft Lockups"    1028         bool "Panic (Reboot) On Soft Lockups"
1082         depends on SOFTLOCKUP_DETECTOR           1029         depends on SOFTLOCKUP_DETECTOR
1083         help                                     1030         help
1084           Say Y here to enable the kernel to     1031           Say Y here to enable the kernel to panic on "soft lockups",
1085           which are bugs that cause the kerne    1032           which are bugs that cause the kernel to loop in kernel
1086           mode for more than 20 seconds (conf    1033           mode for more than 20 seconds (configurable using the watchdog_thresh
1087           sysctl), without giving other tasks    1034           sysctl), without giving other tasks a chance to run.
1088                                                  1035 
1089           The panic can be used in combinatio    1036           The panic can be used in combination with panic_timeout,
1090           to cause the system to reboot autom    1037           to cause the system to reboot automatically after a
1091           lockup has been detected. This feat    1038           lockup has been detected. This feature is useful for
1092           high-availability systems that have    1039           high-availability systems that have uptime guarantees and
1093           where a lockup must be resolved ASA    1040           where a lockup must be resolved ASAP.
1094                                                  1041 
1095           Say N if unsure.                       1042           Say N if unsure.
1096                                                  1043 
1097 config HAVE_HARDLOCKUP_DETECTOR_BUDDY            1044 config HAVE_HARDLOCKUP_DETECTOR_BUDDY
1098         bool                                     1045         bool
1099         depends on SMP                           1046         depends on SMP
1100         default y                                1047         default y
1101                                                  1048 
1102 #                                                1049 #
1103 # Global switch whether to build a hardlockup    1050 # Global switch whether to build a hardlockup detector at all. It is available
1104 # only when the architecture supports at leas    1051 # only when the architecture supports at least one implementation. There are
1105 # two exceptions. The hardlockup detector is     1052 # two exceptions. The hardlockup detector is never enabled on:
1106 #                                                1053 #
1107 #       s390: it reported many false positive    1054 #       s390: it reported many false positives there
1108 #                                                1055 #
1109 #       sparc64: has a custom implementation     1056 #       sparc64: has a custom implementation which is not using the common
1110 #               hardlockup command line optio    1057 #               hardlockup command line options and sysctl interface.
1111 #                                                1058 #
1112 config HARDLOCKUP_DETECTOR                       1059 config HARDLOCKUP_DETECTOR
1113         bool "Detect Hard Lockups"               1060         bool "Detect Hard Lockups"
1114         depends on DEBUG_KERNEL && !S390 && !    1061         depends on DEBUG_KERNEL && !S390 && !HARDLOCKUP_DETECTOR_SPARC64
1115         depends on HAVE_HARDLOCKUP_DETECTOR_P    1062         depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY || HAVE_HARDLOCKUP_DETECTOR_ARCH
1116         imply HARDLOCKUP_DETECTOR_PERF           1063         imply HARDLOCKUP_DETECTOR_PERF
1117         imply HARDLOCKUP_DETECTOR_BUDDY          1064         imply HARDLOCKUP_DETECTOR_BUDDY
1118         imply HARDLOCKUP_DETECTOR_ARCH           1065         imply HARDLOCKUP_DETECTOR_ARCH
1119         select LOCKUP_DETECTOR                   1066         select LOCKUP_DETECTOR
1120                                                  1067 
1121         help                                     1068         help
1122           Say Y here to enable the kernel to     1069           Say Y here to enable the kernel to act as a watchdog to detect
1123           hard lockups.                          1070           hard lockups.
1124                                                  1071 
1125           Hardlockups are bugs that cause the    1072           Hardlockups are bugs that cause the CPU to loop in kernel mode
1126           for more than 10 seconds, without l    1073           for more than 10 seconds, without letting other interrupts have a
1127           chance to run.  The current stack t    1074           chance to run.  The current stack trace is displayed upon detection
1128           and the system will stay locked up.    1075           and the system will stay locked up.
1129                                                  1076 
1130 #                                                1077 #
1131 # Note that arch-specific variants are always    1078 # Note that arch-specific variants are always preferred.
1132 #                                                1079 #
1133 config HARDLOCKUP_DETECTOR_PREFER_BUDDY          1080 config HARDLOCKUP_DETECTOR_PREFER_BUDDY
1134         bool "Prefer the buddy CPU hardlockup    1081         bool "Prefer the buddy CPU hardlockup detector"
1135         depends on HARDLOCKUP_DETECTOR           1082         depends on HARDLOCKUP_DETECTOR
1136         depends on HAVE_HARDLOCKUP_DETECTOR_P    1083         depends on HAVE_HARDLOCKUP_DETECTOR_PERF && HAVE_HARDLOCKUP_DETECTOR_BUDDY
1137         depends on !HAVE_HARDLOCKUP_DETECTOR_    1084         depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
1138         help                                     1085         help
1139           Say Y here to prefer the buddy hard    1086           Say Y here to prefer the buddy hardlockup detector over the perf one.
1140                                                  1087 
1141           With the buddy detector, each CPU u    1088           With the buddy detector, each CPU uses its softlockup hrtimer
1142           to check that the next CPU is proce    1089           to check that the next CPU is processing hrtimer interrupts by
1143           verifying that a counter is increas    1090           verifying that a counter is increasing.
1144                                                  1091 
1145           This hardlockup detector is useful     1092           This hardlockup detector is useful on systems that don't have
1146           an arch-specific hardlockup detecto    1093           an arch-specific hardlockup detector or if resources needed
1147           for the hardlockup detector are bet    1094           for the hardlockup detector are better used for other things.
1148                                                  1095 
1149 config HARDLOCKUP_DETECTOR_PERF                  1096 config HARDLOCKUP_DETECTOR_PERF
1150         bool                                     1097         bool
1151         depends on HARDLOCKUP_DETECTOR           1098         depends on HARDLOCKUP_DETECTOR
1152         depends on HAVE_HARDLOCKUP_DETECTOR_P    1099         depends on HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY
1153         depends on !HAVE_HARDLOCKUP_DETECTOR_    1100         depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
1154         select HARDLOCKUP_DETECTOR_COUNTS_HRT    1101         select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
1155                                                  1102 
1156 config HARDLOCKUP_DETECTOR_BUDDY                 1103 config HARDLOCKUP_DETECTOR_BUDDY
1157         bool                                     1104         bool
1158         depends on HARDLOCKUP_DETECTOR           1105         depends on HARDLOCKUP_DETECTOR
1159         depends on HAVE_HARDLOCKUP_DETECTOR_B    1106         depends on HAVE_HARDLOCKUP_DETECTOR_BUDDY
1160         depends on !HAVE_HARDLOCKUP_DETECTOR_    1107         depends on !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY
1161         depends on !HAVE_HARDLOCKUP_DETECTOR_    1108         depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
1162         select HARDLOCKUP_DETECTOR_COUNTS_HRT    1109         select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
1163                                                  1110 
1164 config HARDLOCKUP_DETECTOR_ARCH                  1111 config HARDLOCKUP_DETECTOR_ARCH
1165         bool                                     1112         bool
1166         depends on HARDLOCKUP_DETECTOR           1113         depends on HARDLOCKUP_DETECTOR
1167         depends on HAVE_HARDLOCKUP_DETECTOR_A    1114         depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
1168         help                                     1115         help
1169           The arch-specific implementation of    1116           The arch-specific implementation of the hardlockup detector will
1170           be used.                               1117           be used.
1171                                                  1118 
1172 #                                                1119 #
1173 # Both the "perf" and "buddy" hardlockup dete    1120 # Both the "perf" and "buddy" hardlockup detectors count hrtimer
1174 # interrupts. This config enables functions m    1121 # interrupts. This config enables functions managing this common code.
1175 #                                                1122 #
1176 config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER        1123 config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
1177         bool                                     1124         bool
1178         select SOFTLOCKUP_DETECTOR               1125         select SOFTLOCKUP_DETECTOR
1179                                                  1126 
1180 #                                                1127 #
1181 # Enables a timestamp based low pass filter t    1128 # Enables a timestamp based low pass filter to compensate for perf based
1182 # hard lockup detection which runs too fast d    1129 # hard lockup detection which runs too fast due to turbo modes.
1183 #                                                1130 #
1184 config HARDLOCKUP_CHECK_TIMESTAMP                1131 config HARDLOCKUP_CHECK_TIMESTAMP
1185         bool                                     1132         bool
1186                                                  1133 
1187 config BOOTPARAM_HARDLOCKUP_PANIC                1134 config BOOTPARAM_HARDLOCKUP_PANIC
1188         bool "Panic (Reboot) On Hard Lockups"    1135         bool "Panic (Reboot) On Hard Lockups"
1189         depends on HARDLOCKUP_DETECTOR           1136         depends on HARDLOCKUP_DETECTOR
1190         help                                     1137         help
1191           Say Y here to enable the kernel to     1138           Say Y here to enable the kernel to panic on "hard lockups",
1192           which are bugs that cause the kerne    1139           which are bugs that cause the kernel to loop in kernel
1193           mode with interrupts disabled for m    1140           mode with interrupts disabled for more than 10 seconds (configurable
1194           using the watchdog_thresh sysctl).     1141           using the watchdog_thresh sysctl).
1195                                                  1142 
1196           Say N if unsure.                       1143           Say N if unsure.
1197                                                  1144 
1198 config DETECT_HUNG_TASK                          1145 config DETECT_HUNG_TASK
1199         bool "Detect Hung Tasks"                 1146         bool "Detect Hung Tasks"
1200         depends on DEBUG_KERNEL                  1147         depends on DEBUG_KERNEL
1201         default SOFTLOCKUP_DETECTOR              1148         default SOFTLOCKUP_DETECTOR
1202         help                                     1149         help
1203           Say Y here to enable the kernel to     1150           Say Y here to enable the kernel to detect "hung tasks",
1204           which are bugs that cause the task     1151           which are bugs that cause the task to be stuck in
1205           uninterruptible "D" state indefinit    1152           uninterruptible "D" state indefinitely.
1206                                                  1153 
1207           When a hung task is detected, the k    1154           When a hung task is detected, the kernel will print the
1208           current stack trace (which you shou    1155           current stack trace (which you should report), but the
1209           task will stay in uninterruptible s    1156           task will stay in uninterruptible state. If lockdep is
1210           enabled then all held locks will al    1157           enabled then all held locks will also be reported. This
1211           feature has negligible overhead.       1158           feature has negligible overhead.
1212                                                  1159 
1213 config DEFAULT_HUNG_TASK_TIMEOUT                 1160 config DEFAULT_HUNG_TASK_TIMEOUT
1214         int "Default timeout for hung task de    1161         int "Default timeout for hung task detection (in seconds)"
1215         depends on DETECT_HUNG_TASK              1162         depends on DETECT_HUNG_TASK
1216         default 120                              1163         default 120
1217         help                                     1164         help
1218           This option controls the default ti    1165           This option controls the default timeout (in seconds) used
1219           to determine when a task has become    1166           to determine when a task has become non-responsive and should
1220           be considered hung.                    1167           be considered hung.
1221                                                  1168 
1222           It can be adjusted at runtime via t    1169           It can be adjusted at runtime via the kernel.hung_task_timeout_secs
1223           sysctl or by writing a value to        1170           sysctl or by writing a value to
1224           /proc/sys/kernel/hung_task_timeout_    1171           /proc/sys/kernel/hung_task_timeout_secs.
1225                                                  1172 
1226           A timeout of 0 disables the check.     1173           A timeout of 0 disables the check.  The default is two minutes.
1227           Keeping the default should be fine     1174           Keeping the default should be fine in most cases.
1228                                                  1175 
1229 config BOOTPARAM_HUNG_TASK_PANIC                 1176 config BOOTPARAM_HUNG_TASK_PANIC
1230         bool "Panic (Reboot) On Hung Tasks"      1177         bool "Panic (Reboot) On Hung Tasks"
1231         depends on DETECT_HUNG_TASK              1178         depends on DETECT_HUNG_TASK
1232         help                                     1179         help
1233           Say Y here to enable the kernel to     1180           Say Y here to enable the kernel to panic on "hung tasks",
1234           which are bugs that cause the kerne    1181           which are bugs that cause the kernel to leave a task stuck
1235           in uninterruptible "D" state.          1182           in uninterruptible "D" state.
1236                                                  1183 
1237           The panic can be used in combinatio    1184           The panic can be used in combination with panic_timeout,
1238           to cause the system to reboot autom    1185           to cause the system to reboot automatically after a
1239           hung task has been detected. This f    1186           hung task has been detected. This feature is useful for
1240           high-availability systems that have    1187           high-availability systems that have uptime guarantees and
1241           where a hung tasks must be resolved    1188           where a hung tasks must be resolved ASAP.
1242                                                  1189 
1243           Say N if unsure.                       1190           Say N if unsure.
1244                                                  1191 
1245 config WQ_WATCHDOG                               1192 config WQ_WATCHDOG
1246         bool "Detect Workqueue Stalls"           1193         bool "Detect Workqueue Stalls"
1247         depends on DEBUG_KERNEL                  1194         depends on DEBUG_KERNEL
1248         help                                     1195         help
1249           Say Y here to enable stall detectio    1196           Say Y here to enable stall detection on workqueues.  If a
1250           worker pool doesn't make forward pr    1197           worker pool doesn't make forward progress on a pending work
1251           item for over a given amount of tim    1198           item for over a given amount of time, 30s by default, a
1252           warning message is printed along wi    1199           warning message is printed along with dump of workqueue
1253           state.  This can be configured thro    1200           state.  This can be configured through kernel parameter
1254           "workqueue.watchdog_thresh" and its    1201           "workqueue.watchdog_thresh" and its sysfs counterpart.
1255                                                  1202 
1256 config WQ_CPU_INTENSIVE_REPORT                   1203 config WQ_CPU_INTENSIVE_REPORT
1257         bool "Report per-cpu work items which    1204         bool "Report per-cpu work items which hog CPU for too long"
1258         depends on DEBUG_KERNEL                  1205         depends on DEBUG_KERNEL
1259         help                                     1206         help
1260           Say Y here to enable reporting of c    1207           Say Y here to enable reporting of concurrency-managed per-cpu work
1261           items that hog CPUs for longer than    1208           items that hog CPUs for longer than
1262           workqueue.cpu_intensive_thresh_us.     1209           workqueue.cpu_intensive_thresh_us. Workqueue automatically
1263           detects and excludes them from conc    1210           detects and excludes them from concurrency management to prevent
1264           them from stalling other per-cpu wo    1211           them from stalling other per-cpu work items. Occassional
1265           triggering may not necessarily indi    1212           triggering may not necessarily indicate a problem. Repeated
1266           triggering likely indicates that th    1213           triggering likely indicates that the work item should be switched
1267           to use an unbound workqueue.           1214           to use an unbound workqueue.
1268                                                  1215 
1269 config TEST_LOCKUP                               1216 config TEST_LOCKUP
1270         tristate "Test module to generate loc    1217         tristate "Test module to generate lockups"
1271         depends on m                             1218         depends on m
1272         help                                     1219         help
1273           This builds the "test_lockup" modul    1220           This builds the "test_lockup" module that helps to make sure
1274           that watchdogs and lockup detectors    1221           that watchdogs and lockup detectors are working properly.
1275                                                  1222 
1276           Depending on module parameters it c    1223           Depending on module parameters it could emulate soft or hard
1277           lockup, "hung task", or locking arb    1224           lockup, "hung task", or locking arbitrary lock for a long time.
1278           Also it could generate series of lo    1225           Also it could generate series of lockups with cooling-down periods.
1279                                                  1226 
1280           If unsure, say N.                      1227           If unsure, say N.
1281                                                  1228 
1282 endmenu # "Debug lockups and hangs"              1229 endmenu # "Debug lockups and hangs"
1283                                                  1230 
1284 menu "Scheduler Debugging"                       1231 menu "Scheduler Debugging"
1285                                                  1232 
1286 config SCHED_DEBUG                               1233 config SCHED_DEBUG
1287         bool "Collect scheduler debugging inf    1234         bool "Collect scheduler debugging info"
1288         depends on DEBUG_KERNEL && DEBUG_FS      1235         depends on DEBUG_KERNEL && DEBUG_FS
1289         default y                                1236         default y
1290         help                                     1237         help
1291           If you say Y here, the /sys/kernel/    1238           If you say Y here, the /sys/kernel/debug/sched file will be provided
1292           that can help debug the scheduler.     1239           that can help debug the scheduler. The runtime overhead of this
1293           option is minimal.                     1240           option is minimal.
1294                                                  1241 
1295 config SCHED_INFO                                1242 config SCHED_INFO
1296         bool                                     1243         bool
1297         default n                                1244         default n
1298                                                  1245 
1299 config SCHEDSTATS                                1246 config SCHEDSTATS
1300         bool "Collect scheduler statistics"      1247         bool "Collect scheduler statistics"
1301         depends on PROC_FS                    !! 1248         depends on DEBUG_KERNEL && PROC_FS
1302         select SCHED_INFO                        1249         select SCHED_INFO
1303         help                                     1250         help
1304           If you say Y here, additional code     1251           If you say Y here, additional code will be inserted into the
1305           scheduler and related routines to c    1252           scheduler and related routines to collect statistics about
1306           scheduler behavior and provide them    1253           scheduler behavior and provide them in /proc/schedstat.  These
1307           stats may be useful for both tuning    1254           stats may be useful for both tuning and debugging the scheduler
1308           If you aren't debugging the schedul    1255           If you aren't debugging the scheduler or trying to tune a specific
1309           application, you can say N to avoid    1256           application, you can say N to avoid the very slight overhead
1310           this adds.                             1257           this adds.
1311                                                  1258 
1312 endmenu                                          1259 endmenu
1313                                                  1260 
1314 config DEBUG_TIMEKEEPING                         1261 config DEBUG_TIMEKEEPING
1315         bool "Enable extra timekeeping sanity    1262         bool "Enable extra timekeeping sanity checking"
1316         help                                     1263         help
1317           This option will enable additional     1264           This option will enable additional timekeeping sanity checks
1318           which may be helpful when diagnosin    1265           which may be helpful when diagnosing issues where timekeeping
1319           problems are suspected.                1266           problems are suspected.
1320                                                  1267 
1321           This may include checks in the time    1268           This may include checks in the timekeeping hotpaths, so this
1322           option may have a (very small) perf    1269           option may have a (very small) performance impact to some
1323           workloads.                             1270           workloads.
1324                                                  1271 
1325           If unsure, say N.                      1272           If unsure, say N.
1326                                                  1273 
1327 config DEBUG_PREEMPT                             1274 config DEBUG_PREEMPT
1328         bool "Debug preemptible kernel"          1275         bool "Debug preemptible kernel"
1329         depends on DEBUG_KERNEL && PREEMPTION    1276         depends on DEBUG_KERNEL && PREEMPTION && TRACE_IRQFLAGS_SUPPORT
1330         help                                     1277         help
1331           If you say Y here then the kernel w    1278           If you say Y here then the kernel will use a debug variant of the
1332           commonly used smp_processor_id() fu    1279           commonly used smp_processor_id() function and will print warnings
1333           if kernel code uses it in a preempt    1280           if kernel code uses it in a preemption-unsafe way. Also, the kernel
1334           will detect preemption count underf    1281           will detect preemption count underflows.
1335                                                  1282 
1336           This option has potential to introd    1283           This option has potential to introduce high runtime overhead,
1337           depending on workload as it trigger    1284           depending on workload as it triggers debugging routines for each
1338           this_cpu operation. It should only     1285           this_cpu operation. It should only be used for debugging purposes.
1339                                                  1286 
1340 menu "Lock Debugging (spinlocks, mutexes, etc    1287 menu "Lock Debugging (spinlocks, mutexes, etc...)"
1341                                                  1288 
1342 config LOCK_DEBUGGING_SUPPORT                    1289 config LOCK_DEBUGGING_SUPPORT
1343         bool                                     1290         bool
1344         depends on TRACE_IRQFLAGS_SUPPORT &&     1291         depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
1345         default y                                1292         default y
1346                                                  1293 
1347 config PROVE_LOCKING                             1294 config PROVE_LOCKING
1348         bool "Lock debugging: prove locking c    1295         bool "Lock debugging: prove locking correctness"
1349         depends on DEBUG_KERNEL && LOCK_DEBUG    1296         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1350         select LOCKDEP                           1297         select LOCKDEP
1351         select DEBUG_SPINLOCK                    1298         select DEBUG_SPINLOCK
1352         select DEBUG_MUTEXES if !PREEMPT_RT      1299         select DEBUG_MUTEXES if !PREEMPT_RT
1353         select DEBUG_RT_MUTEXES if RT_MUTEXES    1300         select DEBUG_RT_MUTEXES if RT_MUTEXES
1354         select DEBUG_RWSEMS if !PREEMPT_RT    !! 1301         select DEBUG_RWSEMS
1355         select DEBUG_WW_MUTEX_SLOWPATH           1302         select DEBUG_WW_MUTEX_SLOWPATH
1356         select DEBUG_LOCK_ALLOC                  1303         select DEBUG_LOCK_ALLOC
1357         select PREEMPT_COUNT if !ARCH_NO_PREE    1304         select PREEMPT_COUNT if !ARCH_NO_PREEMPT
1358         select TRACE_IRQFLAGS                    1305         select TRACE_IRQFLAGS
1359         default n                                1306         default n
1360         help                                     1307         help
1361          This feature enables the kernel to p    1308          This feature enables the kernel to prove that all locking
1362          that occurs in the kernel runtime is    1309          that occurs in the kernel runtime is mathematically
1363          correct: that under no circumstance     1310          correct: that under no circumstance could an arbitrary (and
1364          not yet triggered) combination of ob    1311          not yet triggered) combination of observed locking
1365          sequences (on an arbitrary number of    1312          sequences (on an arbitrary number of CPUs, running an
1366          arbitrary number of tasks and interr    1313          arbitrary number of tasks and interrupt contexts) cause a
1367          deadlock.                               1314          deadlock.
1368                                                  1315 
1369          In short, this feature enables the k    1316          In short, this feature enables the kernel to report locking
1370          related deadlocks before they actual    1317          related deadlocks before they actually occur.
1371                                                  1318 
1372          The proof does not depend on how har    1319          The proof does not depend on how hard and complex a
1373          deadlock scenario would be to trigge    1320          deadlock scenario would be to trigger: how many
1374          participant CPUs, tasks and irq-cont    1321          participant CPUs, tasks and irq-contexts would be needed
1375          for it to trigger. The proof also do    1322          for it to trigger. The proof also does not depend on
1376          timing: if a race and a resulting de    1323          timing: if a race and a resulting deadlock is possible
1377          theoretically (no matter how unlikel    1324          theoretically (no matter how unlikely the race scenario
1378          is), it will be proven so and will i    1325          is), it will be proven so and will immediately be
1379          reported by the kernel (once the eve    1326          reported by the kernel (once the event is observed that
1380          makes the deadlock theoretically pos    1327          makes the deadlock theoretically possible).
1381                                                  1328 
1382          If a deadlock is impossible (i.e. th    1329          If a deadlock is impossible (i.e. the locking rules, as
1383          observed by the kernel, are mathemat    1330          observed by the kernel, are mathematically correct), the
1384          kernel reports nothing.                 1331          kernel reports nothing.
1385                                                  1332 
1386          NOTE: this feature can also be enabl    1333          NOTE: this feature can also be enabled for rwlocks, mutexes
1387          and rwsems - in which case all depen    1334          and rwsems - in which case all dependencies between these
1388          different locking variants are obser    1335          different locking variants are observed and mapped too, and
1389          the proof of observed correctness is    1336          the proof of observed correctness is also maintained for an
1390          arbitrary combination of these separ    1337          arbitrary combination of these separate locking variants.
1391                                                  1338 
1392          For more details, see Documentation/    1339          For more details, see Documentation/locking/lockdep-design.rst.
1393                                                  1340 
1394 config PROVE_RAW_LOCK_NESTING                    1341 config PROVE_RAW_LOCK_NESTING
1395         bool "Enable raw_spinlock - spinlock     1342         bool "Enable raw_spinlock - spinlock nesting checks"
1396         depends on PROVE_LOCKING                 1343         depends on PROVE_LOCKING
1397         default n                                1344         default n
1398         help                                     1345         help
1399          Enable the raw_spinlock vs. spinlock    1346          Enable the raw_spinlock vs. spinlock nesting checks which ensure
1400          that the lock nesting rules for PREE    1347          that the lock nesting rules for PREEMPT_RT enabled kernels are
1401          not violated.                           1348          not violated.
1402                                                  1349 
1403          NOTE: There are known nesting proble    1350          NOTE: There are known nesting problems. So if you enable this
1404          option expect lockdep splats until t    1351          option expect lockdep splats until these problems have been fully
1405          addressed which is work in progress.    1352          addressed which is work in progress. This config switch allows to
1406          identify and analyze these problems.    1353          identify and analyze these problems. It will be removed and the
1407          check permanently enabled once the m    1354          check permanently enabled once the main issues have been fixed.
1408                                                  1355 
1409          If unsure, select N.                    1356          If unsure, select N.
1410                                                  1357 
1411 config LOCK_STAT                                 1358 config LOCK_STAT
1412         bool "Lock usage statistics"             1359         bool "Lock usage statistics"
1413         depends on DEBUG_KERNEL && LOCK_DEBUG    1360         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1414         select LOCKDEP                           1361         select LOCKDEP
1415         select DEBUG_SPINLOCK                    1362         select DEBUG_SPINLOCK
1416         select DEBUG_MUTEXES if !PREEMPT_RT      1363         select DEBUG_MUTEXES if !PREEMPT_RT
1417         select DEBUG_RT_MUTEXES if RT_MUTEXES    1364         select DEBUG_RT_MUTEXES if RT_MUTEXES
1418         select DEBUG_LOCK_ALLOC                  1365         select DEBUG_LOCK_ALLOC
1419         default n                                1366         default n
1420         help                                     1367         help
1421          This feature enables tracking lock c    1368          This feature enables tracking lock contention points
1422                                                  1369 
1423          For more details, see Documentation/    1370          For more details, see Documentation/locking/lockstat.rst
1424                                                  1371 
1425          This also enables lock events requir    1372          This also enables lock events required by "perf lock",
1426          subcommand of perf.                     1373          subcommand of perf.
1427          If you want to use "perf lock", you     1374          If you want to use "perf lock", you also need to turn on
1428          CONFIG_EVENT_TRACING.                   1375          CONFIG_EVENT_TRACING.
1429                                                  1376 
1430          CONFIG_LOCK_STAT defines "contended"    1377          CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
1431          (CONFIG_LOCKDEP defines "acquire" an    1378          (CONFIG_LOCKDEP defines "acquire" and "release" events.)
1432                                                  1379 
1433 config DEBUG_RT_MUTEXES                          1380 config DEBUG_RT_MUTEXES
1434         bool "RT Mutex debugging, deadlock de    1381         bool "RT Mutex debugging, deadlock detection"
1435         depends on DEBUG_KERNEL && RT_MUTEXES    1382         depends on DEBUG_KERNEL && RT_MUTEXES
1436         help                                     1383         help
1437          This allows rt mutex semantics viola    1384          This allows rt mutex semantics violations and rt mutex related
1438          deadlocks (lockups) to be detected a    1385          deadlocks (lockups) to be detected and reported automatically.
1439                                                  1386 
1440 config DEBUG_SPINLOCK                            1387 config DEBUG_SPINLOCK
1441         bool "Spinlock and rw-lock debugging:    1388         bool "Spinlock and rw-lock debugging: basic checks"
1442         depends on DEBUG_KERNEL                  1389         depends on DEBUG_KERNEL
1443         select UNINLINE_SPIN_UNLOCK              1390         select UNINLINE_SPIN_UNLOCK
1444         help                                     1391         help
1445           Say Y here and build SMP to catch m    1392           Say Y here and build SMP to catch missing spinlock initialization
1446           and certain other kinds of spinlock    1393           and certain other kinds of spinlock errors commonly made.  This is
1447           best used in conjunction with the N    1394           best used in conjunction with the NMI watchdog so that spinlock
1448           deadlocks are also debuggable.         1395           deadlocks are also debuggable.
1449                                                  1396 
1450 config DEBUG_MUTEXES                             1397 config DEBUG_MUTEXES
1451         bool "Mutex debugging: basic checks"     1398         bool "Mutex debugging: basic checks"
1452         depends on DEBUG_KERNEL && !PREEMPT_R    1399         depends on DEBUG_KERNEL && !PREEMPT_RT
1453         help                                     1400         help
1454          This feature allows mutex semantics     1401          This feature allows mutex semantics violations to be detected and
1455          reported.                               1402          reported.
1456                                                  1403 
1457 config DEBUG_WW_MUTEX_SLOWPATH                   1404 config DEBUG_WW_MUTEX_SLOWPATH
1458         bool "Wait/wound mutex debugging: Slo    1405         bool "Wait/wound mutex debugging: Slowpath testing"
1459         depends on DEBUG_KERNEL && LOCK_DEBUG    1406         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1460         select DEBUG_LOCK_ALLOC                  1407         select DEBUG_LOCK_ALLOC
1461         select DEBUG_SPINLOCK                    1408         select DEBUG_SPINLOCK
1462         select DEBUG_MUTEXES if !PREEMPT_RT      1409         select DEBUG_MUTEXES if !PREEMPT_RT
1463         select DEBUG_RT_MUTEXES if PREEMPT_RT    1410         select DEBUG_RT_MUTEXES if PREEMPT_RT
1464         help                                     1411         help
1465          This feature enables slowpath testin    1412          This feature enables slowpath testing for w/w mutex users by
1466          injecting additional -EDEADLK wound/    1413          injecting additional -EDEADLK wound/backoff cases. Together with
1467          the full mutex checks enabled with (    1414          the full mutex checks enabled with (CONFIG_PROVE_LOCKING) this
1468          will test all possible w/w mutex int    1415          will test all possible w/w mutex interface abuse with the
1469          exception of simply not acquiring al    1416          exception of simply not acquiring all the required locks.
1470          Note that this feature can introduce    1417          Note that this feature can introduce significant overhead, so
1471          it really should not be enabled in a    1418          it really should not be enabled in a production or distro kernel,
1472          even a debug kernel.  If you are a d    1419          even a debug kernel.  If you are a driver writer, enable it.  If
1473          you are a distro, do not.               1420          you are a distro, do not.
1474                                                  1421 
1475 config DEBUG_RWSEMS                              1422 config DEBUG_RWSEMS
1476         bool "RW Semaphore debugging: basic c    1423         bool "RW Semaphore debugging: basic checks"
1477         depends on DEBUG_KERNEL && !PREEMPT_R !! 1424         depends on DEBUG_KERNEL
1478         help                                     1425         help
1479           This debugging feature allows misma    1426           This debugging feature allows mismatched rw semaphore locks
1480           and unlocks to be detected and repo    1427           and unlocks to be detected and reported.
1481                                                  1428 
1482 config DEBUG_LOCK_ALLOC                          1429 config DEBUG_LOCK_ALLOC
1483         bool "Lock debugging: detect incorrec    1430         bool "Lock debugging: detect incorrect freeing of live locks"
1484         depends on DEBUG_KERNEL && LOCK_DEBUG    1431         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1485         select DEBUG_SPINLOCK                    1432         select DEBUG_SPINLOCK
1486         select DEBUG_MUTEXES if !PREEMPT_RT      1433         select DEBUG_MUTEXES if !PREEMPT_RT
1487         select DEBUG_RT_MUTEXES if RT_MUTEXES    1434         select DEBUG_RT_MUTEXES if RT_MUTEXES
1488         select LOCKDEP                           1435         select LOCKDEP
1489         help                                     1436         help
1490          This feature will check whether any     1437          This feature will check whether any held lock (spinlock, rwlock,
1491          mutex or rwsem) is incorrectly freed    1438          mutex or rwsem) is incorrectly freed by the kernel, via any of the
1492          memory-freeing routines (kfree(), km    1439          memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
1493          vfree(), etc.), whether a live lock     1440          vfree(), etc.), whether a live lock is incorrectly reinitialized via
1494          spin_lock_init()/mutex_init()/etc.,     1441          spin_lock_init()/mutex_init()/etc., or whether there is any lock
1495          held during task exit.                  1442          held during task exit.
1496                                                  1443 
1497 config LOCKDEP                                   1444 config LOCKDEP
1498         bool                                     1445         bool
1499         depends on DEBUG_KERNEL && LOCK_DEBUG    1446         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1500         select STACKTRACE                        1447         select STACKTRACE
1501         select KALLSYMS                          1448         select KALLSYMS
1502         select KALLSYMS_ALL                      1449         select KALLSYMS_ALL
1503                                                  1450 
1504 config LOCKDEP_SMALL                             1451 config LOCKDEP_SMALL
1505         bool                                     1452         bool
1506                                                  1453 
1507 config LOCKDEP_BITS                              1454 config LOCKDEP_BITS
1508         int "Bitsize for MAX_LOCKDEP_ENTRIES"    1455         int "Bitsize for MAX_LOCKDEP_ENTRIES"
1509         depends on LOCKDEP && !LOCKDEP_SMALL     1456         depends on LOCKDEP && !LOCKDEP_SMALL
1510         range 10 30                              1457         range 10 30
1511         default 15                               1458         default 15
1512         help                                     1459         help
1513           Try increasing this value if you hi    1460           Try increasing this value if you hit "BUG: MAX_LOCKDEP_ENTRIES too low!" message.
1514                                                  1461 
1515 config LOCKDEP_CHAINS_BITS                       1462 config LOCKDEP_CHAINS_BITS
1516         int "Bitsize for MAX_LOCKDEP_CHAINS"     1463         int "Bitsize for MAX_LOCKDEP_CHAINS"
1517         depends on LOCKDEP && !LOCKDEP_SMALL     1464         depends on LOCKDEP && !LOCKDEP_SMALL
1518         range 10 30                              1465         range 10 30
1519         default 16                               1466         default 16
1520         help                                     1467         help
1521           Try increasing this value if you hi    1468           Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
1522                                                  1469 
1523 config LOCKDEP_STACK_TRACE_BITS                  1470 config LOCKDEP_STACK_TRACE_BITS
1524         int "Bitsize for MAX_STACK_TRACE_ENTR    1471         int "Bitsize for MAX_STACK_TRACE_ENTRIES"
1525         depends on LOCKDEP && !LOCKDEP_SMALL     1472         depends on LOCKDEP && !LOCKDEP_SMALL
1526         range 10 30                              1473         range 10 30
1527         default 19                               1474         default 19
1528         help                                     1475         help
1529           Try increasing this value if you hi    1476           Try increasing this value if you hit "BUG: MAX_STACK_TRACE_ENTRIES too low!" message.
1530                                                  1477 
1531 config LOCKDEP_STACK_TRACE_HASH_BITS             1478 config LOCKDEP_STACK_TRACE_HASH_BITS
1532         int "Bitsize for STACK_TRACE_HASH_SIZ    1479         int "Bitsize for STACK_TRACE_HASH_SIZE"
1533         depends on LOCKDEP && !LOCKDEP_SMALL     1480         depends on LOCKDEP && !LOCKDEP_SMALL
1534         range 10 30                              1481         range 10 30
1535         default 14                               1482         default 14
1536         help                                     1483         help
1537           Try increasing this value if you ne    1484           Try increasing this value if you need large STACK_TRACE_HASH_SIZE.
1538                                                  1485 
1539 config LOCKDEP_CIRCULAR_QUEUE_BITS               1486 config LOCKDEP_CIRCULAR_QUEUE_BITS
1540         int "Bitsize for elements in circular    1487         int "Bitsize for elements in circular_queue struct"
1541         depends on LOCKDEP                       1488         depends on LOCKDEP
1542         range 10 30                              1489         range 10 30
1543         default 12                               1490         default 12
1544         help                                     1491         help
1545           Try increasing this value if you hi    1492           Try increasing this value if you hit "lockdep bfs error:-1" warning due to __cq_enqueue() failure.
1546                                                  1493 
1547 config DEBUG_LOCKDEP                             1494 config DEBUG_LOCKDEP
1548         bool "Lock dependency engine debuggin    1495         bool "Lock dependency engine debugging"
1549         depends on DEBUG_KERNEL && LOCKDEP       1496         depends on DEBUG_KERNEL && LOCKDEP
1550         select DEBUG_IRQFLAGS                    1497         select DEBUG_IRQFLAGS
1551         help                                     1498         help
1552           If you say Y here, the lock depende    1499           If you say Y here, the lock dependency engine will do
1553           additional runtime checks to debug     1500           additional runtime checks to debug itself, at the price
1554           of more runtime overhead.              1501           of more runtime overhead.
1555                                                  1502 
1556 config DEBUG_ATOMIC_SLEEP                        1503 config DEBUG_ATOMIC_SLEEP
1557         bool "Sleep inside atomic section che    1504         bool "Sleep inside atomic section checking"
1558         select PREEMPT_COUNT                     1505         select PREEMPT_COUNT
1559         depends on DEBUG_KERNEL                  1506         depends on DEBUG_KERNEL
1560         depends on !ARCH_NO_PREEMPT              1507         depends on !ARCH_NO_PREEMPT
1561         help                                     1508         help
1562           If you say Y here, various routines    1509           If you say Y here, various routines which may sleep will become very
1563           noisy if they are called inside ato    1510           noisy if they are called inside atomic sections: when a spinlock is
1564           held, inside an rcu read side criti    1511           held, inside an rcu read side critical section, inside preempt disabled
1565           sections, inside an interrupt, etc.    1512           sections, inside an interrupt, etc...
1566                                                  1513 
1567 config DEBUG_LOCKING_API_SELFTESTS               1514 config DEBUG_LOCKING_API_SELFTESTS
1568         bool "Locking API boot-time self-test    1515         bool "Locking API boot-time self-tests"
1569         depends on DEBUG_KERNEL                  1516         depends on DEBUG_KERNEL
1570         help                                     1517         help
1571           Say Y here if you want the kernel t    1518           Say Y here if you want the kernel to run a short self-test during
1572           bootup. The self-test checks whethe    1519           bootup. The self-test checks whether common types of locking bugs
1573           are detected by debugging mechanism    1520           are detected by debugging mechanisms or not. (if you disable
1574           lock debugging then those bugs won'    1521           lock debugging then those bugs won't be detected of course.)
1575           The following locking APIs are cove    1522           The following locking APIs are covered: spinlocks, rwlocks,
1576           mutexes and rwsems.                    1523           mutexes and rwsems.
1577                                                  1524 
1578 config LOCK_TORTURE_TEST                         1525 config LOCK_TORTURE_TEST
1579         tristate "torture tests for locking"     1526         tristate "torture tests for locking"
1580         depends on DEBUG_KERNEL                  1527         depends on DEBUG_KERNEL
1581         select TORTURE_TEST                      1528         select TORTURE_TEST
1582         help                                     1529         help
1583           This option provides a kernel modul    1530           This option provides a kernel module that runs torture tests
1584           on kernel locking primitives.  The     1531           on kernel locking primitives.  The kernel module may be built
1585           after the fact on the running kerne    1532           after the fact on the running kernel to be tested, if desired.
1586                                                  1533 
1587           Say Y here if you want kernel locki    1534           Say Y here if you want kernel locking-primitive torture tests
1588           to be built into the kernel.           1535           to be built into the kernel.
1589           Say M if you want these torture tes    1536           Say M if you want these torture tests to build as a module.
1590           Say N if you are unsure.               1537           Say N if you are unsure.
1591                                                  1538 
1592 config WW_MUTEX_SELFTEST                         1539 config WW_MUTEX_SELFTEST
1593         tristate "Wait/wound mutex selftests"    1540         tristate "Wait/wound mutex selftests"
1594         help                                     1541         help
1595           This option provides a kernel modul    1542           This option provides a kernel module that runs tests on the
1596           on the struct ww_mutex locking API.    1543           on the struct ww_mutex locking API.
1597                                                  1544 
1598           It is recommended to enable DEBUG_W    1545           It is recommended to enable DEBUG_WW_MUTEX_SLOWPATH in conjunction
1599           with this test harness.                1546           with this test harness.
1600                                                  1547 
1601           Say M if you want these self tests     1548           Say M if you want these self tests to build as a module.
1602           Say N if you are unsure.               1549           Say N if you are unsure.
1603                                                  1550 
1604 config SCF_TORTURE_TEST                          1551 config SCF_TORTURE_TEST
1605         tristate "torture tests for smp_call_    1552         tristate "torture tests for smp_call_function*()"
1606         depends on DEBUG_KERNEL                  1553         depends on DEBUG_KERNEL
1607         select TORTURE_TEST                      1554         select TORTURE_TEST
1608         help                                     1555         help
1609           This option provides a kernel modul    1556           This option provides a kernel module that runs torture tests
1610           on the smp_call_function() family o    1557           on the smp_call_function() family of primitives.  The kernel
1611           module may be built after the fact     1558           module may be built after the fact on the running kernel to
1612           be tested, if desired.                 1559           be tested, if desired.
1613                                                  1560 
1614 config CSD_LOCK_WAIT_DEBUG                       1561 config CSD_LOCK_WAIT_DEBUG
1615         bool "Debugging for csd_lock_wait(),     1562         bool "Debugging for csd_lock_wait(), called from smp_call_function*()"
1616         depends on DEBUG_KERNEL                  1563         depends on DEBUG_KERNEL
1617         depends on 64BIT                         1564         depends on 64BIT
1618         default n                                1565         default n
1619         help                                     1566         help
1620           This option enables debug prints wh    1567           This option enables debug prints when CPUs are slow to respond
1621           to the smp_call_function*() IPI wra    1568           to the smp_call_function*() IPI wrappers.  These debug prints
1622           include the IPI handler function cu    1569           include the IPI handler function currently executing (if any)
1623           and relevant stack traces.             1570           and relevant stack traces.
1624                                                  1571 
1625 config CSD_LOCK_WAIT_DEBUG_DEFAULT               1572 config CSD_LOCK_WAIT_DEBUG_DEFAULT
1626         bool "Default csd_lock_wait() debuggi    1573         bool "Default csd_lock_wait() debugging on at boot time"
1627         depends on CSD_LOCK_WAIT_DEBUG           1574         depends on CSD_LOCK_WAIT_DEBUG
1628         depends on 64BIT                         1575         depends on 64BIT
1629         default n                                1576         default n
1630         help                                     1577         help
1631           This option causes the csdlock_debu    1578           This option causes the csdlock_debug= kernel boot parameter to
1632           default to 1 (basic debugging) inst    1579           default to 1 (basic debugging) instead of 0 (no debugging).
1633                                                  1580 
1634 endmenu # lock debugging                         1581 endmenu # lock debugging
1635                                                  1582 
1636 config TRACE_IRQFLAGS                            1583 config TRACE_IRQFLAGS
1637         depends on TRACE_IRQFLAGS_SUPPORT        1584         depends on TRACE_IRQFLAGS_SUPPORT
1638         bool                                     1585         bool
1639         help                                     1586         help
1640           Enables hooks to interrupt enabling    1587           Enables hooks to interrupt enabling and disabling for
1641           either tracing or lock debugging.      1588           either tracing or lock debugging.
1642                                                  1589 
1643 config TRACE_IRQFLAGS_NMI                        1590 config TRACE_IRQFLAGS_NMI
1644         def_bool y                               1591         def_bool y
1645         depends on TRACE_IRQFLAGS                1592         depends on TRACE_IRQFLAGS
1646         depends on TRACE_IRQFLAGS_NMI_SUPPORT    1593         depends on TRACE_IRQFLAGS_NMI_SUPPORT
1647                                                  1594 
1648 config NMI_CHECK_CPU                             1595 config NMI_CHECK_CPU
1649         bool "Debugging for CPUs failing to r    1596         bool "Debugging for CPUs failing to respond to backtrace requests"
1650         depends on DEBUG_KERNEL                  1597         depends on DEBUG_KERNEL
1651         depends on X86                           1598         depends on X86
1652         default n                                1599         default n
1653         help                                     1600         help
1654           Enables debug prints when a CPU fai    1601           Enables debug prints when a CPU fails to respond to a given
1655           backtrace NMI.  These prints provid    1602           backtrace NMI.  These prints provide some reasons why a CPU
1656           might legitimately be failing to re    1603           might legitimately be failing to respond, for example, if it
1657           is offline of if ignore_nmis is set    1604           is offline of if ignore_nmis is set.
1658                                                  1605 
1659 config DEBUG_IRQFLAGS                            1606 config DEBUG_IRQFLAGS
1660         bool "Debug IRQ flag manipulation"       1607         bool "Debug IRQ flag manipulation"
1661         help                                     1608         help
1662           Enables checks for potentially unsa    1609           Enables checks for potentially unsafe enabling or disabling of
1663           interrupts, such as calling raw_loc    1610           interrupts, such as calling raw_local_irq_restore() when interrupts
1664           are enabled.                           1611           are enabled.
1665                                                  1612 
1666 config STACKTRACE                                1613 config STACKTRACE
1667         bool "Stack backtrace support"           1614         bool "Stack backtrace support"
1668         depends on STACKTRACE_SUPPORT            1615         depends on STACKTRACE_SUPPORT
1669         help                                     1616         help
1670           This option causes the kernel to cr    1617           This option causes the kernel to create a /proc/pid/stack for
1671           every process, showing its current     1618           every process, showing its current stack trace.
1672           It is also used by various kernel d    1619           It is also used by various kernel debugging features that require
1673           stack trace generation.                1620           stack trace generation.
1674                                                  1621 
1675 config WARN_ALL_UNSEEDED_RANDOM                  1622 config WARN_ALL_UNSEEDED_RANDOM
1676         bool "Warn for all uses of unseeded r    1623         bool "Warn for all uses of unseeded randomness"
1677         default n                                1624         default n
1678         help                                     1625         help
1679           Some parts of the kernel contain bu    1626           Some parts of the kernel contain bugs relating to their use of
1680           cryptographically secure random num    1627           cryptographically secure random numbers before it's actually possible
1681           to generate those numbers securely.    1628           to generate those numbers securely. This setting ensures that these
1682           flaws don't go unnoticed, by enabli    1629           flaws don't go unnoticed, by enabling a message, should this ever
1683           occur. This will allow people with     1630           occur. This will allow people with obscure setups to know when things
1684           are going wrong, so that they might    1631           are going wrong, so that they might contact developers about fixing
1685           it.                                    1632           it.
1686                                                  1633 
1687           Unfortunately, on some models of so    1634           Unfortunately, on some models of some architectures getting
1688           a fully seeded CRNG is extremely di    1635           a fully seeded CRNG is extremely difficult, and so this can
1689           result in dmesg getting spammed for    1636           result in dmesg getting spammed for a surprisingly long
1690           time.  This is really bad from a se    1637           time.  This is really bad from a security perspective, and
1691           so architecture maintainers really     1638           so architecture maintainers really need to do what they can
1692           to get the CRNG seeded sooner after    1639           to get the CRNG seeded sooner after the system is booted.
1693           However, since users cannot do anyt    1640           However, since users cannot do anything actionable to
1694           address this, by default this optio    1641           address this, by default this option is disabled.
1695                                                  1642 
1696           Say Y here if you want to receive w    1643           Say Y here if you want to receive warnings for all uses of
1697           unseeded randomness.  This will be     1644           unseeded randomness.  This will be of use primarily for
1698           those developers interested in impr    1645           those developers interested in improving the security of
1699           Linux kernels running on their arch    1646           Linux kernels running on their architecture (or
1700           subarchitecture).                      1647           subarchitecture).
1701                                                  1648 
1702 config DEBUG_KOBJECT                             1649 config DEBUG_KOBJECT
1703         bool "kobject debugging"                 1650         bool "kobject debugging"
1704         depends on DEBUG_KERNEL                  1651         depends on DEBUG_KERNEL
1705         help                                     1652         help
1706           If you say Y here, some extra kobje    1653           If you say Y here, some extra kobject debugging messages will be sent
1707           to the syslog.                         1654           to the syslog.
1708                                                  1655 
1709 config DEBUG_KOBJECT_RELEASE                     1656 config DEBUG_KOBJECT_RELEASE
1710         bool "kobject release debugging"         1657         bool "kobject release debugging"
1711         depends on DEBUG_OBJECTS_TIMERS          1658         depends on DEBUG_OBJECTS_TIMERS
1712         help                                     1659         help
1713           kobjects are reference counted obje    1660           kobjects are reference counted objects.  This means that their
1714           last reference count put is not pre    1661           last reference count put is not predictable, and the kobject can
1715           live on past the point at which a d    1662           live on past the point at which a driver decides to drop its
1716           initial reference to the kobject ga    1663           initial reference to the kobject gained on allocation.  An
1717           example of this would be a struct d    1664           example of this would be a struct device which has just been
1718           unregistered.                          1665           unregistered.
1719                                                  1666 
1720           However, some buggy drivers assume     1667           However, some buggy drivers assume that after such an operation,
1721           the memory backing the kobject can     1668           the memory backing the kobject can be immediately freed.  This
1722           goes completely against the princip    1669           goes completely against the principles of a refcounted object.
1723                                                  1670 
1724           If you say Y here, the kernel will     1671           If you say Y here, the kernel will delay the release of kobjects
1725           on the last reference count to impr    1672           on the last reference count to improve the visibility of this
1726           kind of kobject release bug.           1673           kind of kobject release bug.
1727                                                  1674 
1728 config HAVE_DEBUG_BUGVERBOSE                     1675 config HAVE_DEBUG_BUGVERBOSE
1729         bool                                     1676         bool
1730                                                  1677 
1731 menu "Debug kernel data structures"              1678 menu "Debug kernel data structures"
1732                                                  1679 
1733 config DEBUG_LIST                                1680 config DEBUG_LIST
1734         bool "Debug linked list manipulation"    1681         bool "Debug linked list manipulation"
1735         depends on DEBUG_KERNEL                  1682         depends on DEBUG_KERNEL
1736         select LIST_HARDENED                     1683         select LIST_HARDENED
1737         help                                     1684         help
1738           Enable this to turn on extended che    1685           Enable this to turn on extended checks in the linked-list walking
1739           routines.                              1686           routines.
1740                                                  1687 
1741           This option trades better quality e    1688           This option trades better quality error reports for performance, and
1742           is more suitable for kernel debuggi    1689           is more suitable for kernel debugging. If you care about performance,
1743           you should only enable CONFIG_LIST_    1690           you should only enable CONFIG_LIST_HARDENED instead.
1744                                                  1691 
1745           If unsure, say N.                      1692           If unsure, say N.
1746                                                  1693 
1747 config DEBUG_PLIST                               1694 config DEBUG_PLIST
1748         bool "Debug priority linked list mani    1695         bool "Debug priority linked list manipulation"
1749         depends on DEBUG_KERNEL                  1696         depends on DEBUG_KERNEL
1750         help                                     1697         help
1751           Enable this to turn on extended che    1698           Enable this to turn on extended checks in the priority-ordered
1752           linked-list (plist) walking routine    1699           linked-list (plist) walking routines.  This checks the entire
1753           list multiple times during each man    1700           list multiple times during each manipulation.
1754                                                  1701 
1755           If unsure, say N.                      1702           If unsure, say N.
1756                                                  1703 
1757 config DEBUG_SG                                  1704 config DEBUG_SG
1758         bool "Debug SG table operations"         1705         bool "Debug SG table operations"
1759         depends on DEBUG_KERNEL                  1706         depends on DEBUG_KERNEL
1760         help                                     1707         help
1761           Enable this to turn on checks on sc    1708           Enable this to turn on checks on scatter-gather tables. This can
1762           help find problems with drivers tha    1709           help find problems with drivers that do not properly initialize
1763           their sg tables.                       1710           their sg tables.
1764                                                  1711 
1765           If unsure, say N.                      1712           If unsure, say N.
1766                                                  1713 
1767 config DEBUG_NOTIFIERS                           1714 config DEBUG_NOTIFIERS
1768         bool "Debug notifier call chains"        1715         bool "Debug notifier call chains"
1769         depends on DEBUG_KERNEL                  1716         depends on DEBUG_KERNEL
1770         help                                     1717         help
1771           Enable this to turn on sanity check    1718           Enable this to turn on sanity checking for notifier call chains.
1772           This is most useful for kernel deve    1719           This is most useful for kernel developers to make sure that
1773           modules properly unregister themsel    1720           modules properly unregister themselves from notifier chains.
1774           This is a relatively cheap check bu    1721           This is a relatively cheap check but if you care about maximum
1775           performance, say N.                    1722           performance, say N.
1776                                                  1723 
1777 config DEBUG_CLOSURES                         << 
1778         bool "Debug closures (bcache async wi << 
1779         depends on CLOSURES                   << 
1780         select DEBUG_FS                       << 
1781         help                                  << 
1782           Keeps all active closures in a link << 
1783           interface to list them, which makes << 
1784           operations that get stuck.          << 
1785                                               << 
1786 config DEBUG_MAPLE_TREE                          1724 config DEBUG_MAPLE_TREE
1787         bool "Debug maple trees"                 1725         bool "Debug maple trees"
1788         depends on DEBUG_KERNEL                  1726         depends on DEBUG_KERNEL
1789         help                                     1727         help
1790           Enable maple tree debugging informa    1728           Enable maple tree debugging information and extra validations.
1791                                                  1729 
1792           If unsure, say N.                      1730           If unsure, say N.
1793                                                  1731 
1794 endmenu                                          1732 endmenu
1795                                                  1733 
1796 source "kernel/rcu/Kconfig.debug"                1734 source "kernel/rcu/Kconfig.debug"
1797                                                  1735 
1798 config DEBUG_WQ_FORCE_RR_CPU                     1736 config DEBUG_WQ_FORCE_RR_CPU
1799         bool "Force round-robin CPU selection    1737         bool "Force round-robin CPU selection for unbound work items"
1800         depends on DEBUG_KERNEL                  1738         depends on DEBUG_KERNEL
1801         default n                                1739         default n
1802         help                                     1740         help
1803           Workqueue used to implicitly guaran    1741           Workqueue used to implicitly guarantee that work items queued
1804           without explicit CPU specified are     1742           without explicit CPU specified are put on the local CPU.  This
1805           guarantee is no longer true and whi    1743           guarantee is no longer true and while local CPU is still
1806           preferred work items may be put on     1744           preferred work items may be put on foreign CPUs.  Kernel
1807           parameter "workqueue.debug_force_rr    1745           parameter "workqueue.debug_force_rr_cpu" is added to force
1808           round-robin CPU selection to flush     1746           round-robin CPU selection to flush out usages which depend on the
1809           now broken guarantee.  This config     1747           now broken guarantee.  This config option enables the debug
1810           feature by default.  When enabled,     1748           feature by default.  When enabled, memory and cache locality will
1811           be impacted.                           1749           be impacted.
1812                                                  1750 
1813 config CPU_HOTPLUG_STATE_CONTROL                 1751 config CPU_HOTPLUG_STATE_CONTROL
1814         bool "Enable CPU hotplug state contro    1752         bool "Enable CPU hotplug state control"
1815         depends on DEBUG_KERNEL                  1753         depends on DEBUG_KERNEL
1816         depends on HOTPLUG_CPU                   1754         depends on HOTPLUG_CPU
1817         default n                                1755         default n
1818         help                                     1756         help
1819           Allows to write steps between "offl    1757           Allows to write steps between "offline" and "online" to the CPUs
1820           sysfs target file so states can be     1758           sysfs target file so states can be stepped granular. This is a debug
1821           option for now as the hotplug machi    1759           option for now as the hotplug machinery cannot be stopped and
1822           restarted at arbitrary points yet.     1760           restarted at arbitrary points yet.
1823                                                  1761 
1824           Say N if your are unsure.              1762           Say N if your are unsure.
1825                                                  1763 
1826 config LATENCYTOP                                1764 config LATENCYTOP
1827         bool "Latency measuring infrastructur    1765         bool "Latency measuring infrastructure"
1828         depends on DEBUG_KERNEL                  1766         depends on DEBUG_KERNEL
1829         depends on STACKTRACE_SUPPORT            1767         depends on STACKTRACE_SUPPORT
1830         depends on PROC_FS                       1768         depends on PROC_FS
1831         depends on FRAME_POINTER || MIPS || P    1769         depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
1832         select KALLSYMS                          1770         select KALLSYMS
1833         select KALLSYMS_ALL                      1771         select KALLSYMS_ALL
1834         select STACKTRACE                        1772         select STACKTRACE
1835         select SCHEDSTATS                        1773         select SCHEDSTATS
1836         help                                     1774         help
1837           Enable this option if you want to u    1775           Enable this option if you want to use the LatencyTOP tool
1838           to find out which userspace is bloc    1776           to find out which userspace is blocking on what kernel operations.
1839                                                  1777 
1840 config DEBUG_CGROUP_REF                          1778 config DEBUG_CGROUP_REF
1841         bool "Disable inlining of cgroup css     1779         bool "Disable inlining of cgroup css reference count functions"
1842         depends on DEBUG_KERNEL                  1780         depends on DEBUG_KERNEL
1843         depends on CGROUPS                       1781         depends on CGROUPS
1844         depends on KPROBES                       1782         depends on KPROBES
1845         default n                                1783         default n
1846         help                                     1784         help
1847           Force cgroup css reference count fu    1785           Force cgroup css reference count functions to not be inlined so
1848           that they can be kprobed for debugg    1786           that they can be kprobed for debugging.
1849                                                  1787 
1850 source "kernel/trace/Kconfig"                    1788 source "kernel/trace/Kconfig"
1851                                                  1789 
1852 config PROVIDE_OHCI1394_DMA_INIT                 1790 config PROVIDE_OHCI1394_DMA_INIT
1853         bool "Remote debugging over FireWire     1791         bool "Remote debugging over FireWire early on boot"
1854         depends on PCI && X86                    1792         depends on PCI && X86
1855         help                                     1793         help
1856           If you want to debug problems which    1794           If you want to debug problems which hang or crash the kernel early
1857           on boot and the crashing machine ha    1795           on boot and the crashing machine has a FireWire port, you can use
1858           this feature to remotely access the    1796           this feature to remotely access the memory of the crashed machine
1859           over FireWire. This employs remote     1797           over FireWire. This employs remote DMA as part of the OHCI1394
1860           specification which is now the stan    1798           specification which is now the standard for FireWire controllers.
1861                                                  1799 
1862           With remote DMA, you can monitor th    1800           With remote DMA, you can monitor the printk buffer remotely using
1863           firescope and access all memory bel    1801           firescope and access all memory below 4GB using fireproxy from gdb.
1864           Even controlling a kernel debugger     1802           Even controlling a kernel debugger is possible using remote DMA.
1865                                                  1803 
1866           Usage:                                 1804           Usage:
1867                                                  1805 
1868           If ohci1394_dma=early is used as bo    1806           If ohci1394_dma=early is used as boot parameter, it will initialize
1869           all OHCI1394 controllers which are     1807           all OHCI1394 controllers which are found in the PCI config space.
1870                                                  1808 
1871           As all changes to the FireWire bus     1809           As all changes to the FireWire bus such as enabling and disabling
1872           devices cause a bus reset and there    1810           devices cause a bus reset and thereby disable remote DMA for all
1873           devices, be sure to have the cable     1811           devices, be sure to have the cable plugged and FireWire enabled on
1874           the debugging host before booting t    1812           the debugging host before booting the debug target for debugging.
1875                                                  1813 
1876           This code (~1k) is freed after boot    1814           This code (~1k) is freed after boot. By then, the firewire stack
1877           in charge of the OHCI-1394 controll    1815           in charge of the OHCI-1394 controllers should be used instead.
1878                                                  1816 
1879           See Documentation/core-api/debuggin    1817           See Documentation/core-api/debugging-via-ohci1394.rst for more information.
1880                                                  1818 
1881 source "samples/Kconfig"                         1819 source "samples/Kconfig"
1882                                                  1820 
1883 config ARCH_HAS_DEVMEM_IS_ALLOWED                1821 config ARCH_HAS_DEVMEM_IS_ALLOWED
1884         bool                                     1822         bool
1885                                                  1823 
1886 config STRICT_DEVMEM                             1824 config STRICT_DEVMEM
1887         bool "Filter access to /dev/mem"         1825         bool "Filter access to /dev/mem"
1888         depends on MMU && DEVMEM                 1826         depends on MMU && DEVMEM
1889         depends on ARCH_HAS_DEVMEM_IS_ALLOWED    1827         depends on ARCH_HAS_DEVMEM_IS_ALLOWED || GENERIC_LIB_DEVMEM_IS_ALLOWED
1890         default y if PPC || X86 || ARM64         1828         default y if PPC || X86 || ARM64
1891         help                                     1829         help
1892           If this option is disabled, you all    1830           If this option is disabled, you allow userspace (root) access to all
1893           of memory, including kernel and use    1831           of memory, including kernel and userspace memory. Accidental
1894           access to this is obviously disastr    1832           access to this is obviously disastrous, but specific access can
1895           be used by people debugging the ker    1833           be used by people debugging the kernel. Note that with PAT support
1896           enabled, even in this case there ar    1834           enabled, even in this case there are restrictions on /dev/mem
1897           use due to the cache aliasing requi    1835           use due to the cache aliasing requirements.
1898                                                  1836 
1899           If this option is switched on, and     1837           If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
1900           file only allows userspace access t    1838           file only allows userspace access to PCI space and the BIOS code and
1901           data regions.  This is sufficient f    1839           data regions.  This is sufficient for dosemu and X and all common
1902           users of /dev/mem.                     1840           users of /dev/mem.
1903                                                  1841 
1904           If in doubt, say Y.                    1842           If in doubt, say Y.
1905                                                  1843 
1906 config IO_STRICT_DEVMEM                          1844 config IO_STRICT_DEVMEM
1907         bool "Filter I/O access to /dev/mem"     1845         bool "Filter I/O access to /dev/mem"
1908         depends on STRICT_DEVMEM                 1846         depends on STRICT_DEVMEM
1909         help                                     1847         help
1910           If this option is disabled, you all    1848           If this option is disabled, you allow userspace (root) access to all
1911           io-memory regardless of whether a d    1849           io-memory regardless of whether a driver is actively using that
1912           range.  Accidental access to this i    1850           range.  Accidental access to this is obviously disastrous, but
1913           specific access can be used by peop    1851           specific access can be used by people debugging kernel drivers.
1914                                                  1852 
1915           If this option is switched on, the     1853           If this option is switched on, the /dev/mem file only allows
1916           userspace access to *idle* io-memor    1854           userspace access to *idle* io-memory ranges (see /proc/iomem) This
1917           may break traditional users of /dev    1855           may break traditional users of /dev/mem (dosemu, legacy X, etc...)
1918           if the driver using a given range c    1856           if the driver using a given range cannot be disabled.
1919                                                  1857 
1920           If in doubt, say Y.                    1858           If in doubt, say Y.
1921                                                  1859 
1922 menu "$(SRCARCH) Debugging"                      1860 menu "$(SRCARCH) Debugging"
1923                                                  1861 
1924 source "arch/$(SRCARCH)/Kconfig.debug"           1862 source "arch/$(SRCARCH)/Kconfig.debug"
1925                                                  1863 
1926 endmenu                                          1864 endmenu
1927                                                  1865 
1928 menu "Kernel Testing and Coverage"               1866 menu "Kernel Testing and Coverage"
1929                                                  1867 
1930 source "lib/kunit/Kconfig"                       1868 source "lib/kunit/Kconfig"
1931                                                  1869 
1932 config NOTIFIER_ERROR_INJECTION                  1870 config NOTIFIER_ERROR_INJECTION
1933         tristate "Notifier error injection"      1871         tristate "Notifier error injection"
1934         depends on DEBUG_KERNEL                  1872         depends on DEBUG_KERNEL
1935         select DEBUG_FS                          1873         select DEBUG_FS
1936         help                                     1874         help
1937           This option provides the ability to    1875           This option provides the ability to inject artificial errors to
1938           specified notifier chain callbacks.    1876           specified notifier chain callbacks. It is useful to test the error
1939           handling of notifier call chain fai    1877           handling of notifier call chain failures.
1940                                                  1878 
1941           Say N if unsure.                       1879           Say N if unsure.
1942                                                  1880 
1943 config PM_NOTIFIER_ERROR_INJECT                  1881 config PM_NOTIFIER_ERROR_INJECT
1944         tristate "PM notifier error injection    1882         tristate "PM notifier error injection module"
1945         depends on PM && NOTIFIER_ERROR_INJEC    1883         depends on PM && NOTIFIER_ERROR_INJECTION
1946         default m if PM_DEBUG                    1884         default m if PM_DEBUG
1947         help                                     1885         help
1948           This option provides the ability to    1886           This option provides the ability to inject artificial errors to
1949           PM notifier chain callbacks.  It is    1887           PM notifier chain callbacks.  It is controlled through debugfs
1950           interface /sys/kernel/debug/notifie    1888           interface /sys/kernel/debug/notifier-error-inject/pm
1951                                                  1889 
1952           If the notifier call chain should b    1890           If the notifier call chain should be failed with some events
1953           notified, write the error code to "    1891           notified, write the error code to "actions/<notifier event>/error".
1954                                                  1892 
1955           Example: Inject PM suspend error (-    1893           Example: Inject PM suspend error (-12 = -ENOMEM)
1956                                                  1894 
1957           # cd /sys/kernel/debug/notifier-err    1895           # cd /sys/kernel/debug/notifier-error-inject/pm/
1958           # echo -12 > actions/PM_SUSPEND_PRE    1896           # echo -12 > actions/PM_SUSPEND_PREPARE/error
1959           # echo mem > /sys/power/state          1897           # echo mem > /sys/power/state
1960           bash: echo: write error: Cannot all    1898           bash: echo: write error: Cannot allocate memory
1961                                                  1899 
1962           To compile this code as a module, c    1900           To compile this code as a module, choose M here: the module will
1963           be called pm-notifier-error-inject.    1901           be called pm-notifier-error-inject.
1964                                                  1902 
1965           If unsure, say N.                      1903           If unsure, say N.
1966                                                  1904 
1967 config OF_RECONFIG_NOTIFIER_ERROR_INJECT         1905 config OF_RECONFIG_NOTIFIER_ERROR_INJECT
1968         tristate "OF reconfig notifier error     1906         tristate "OF reconfig notifier error injection module"
1969         depends on OF_DYNAMIC && NOTIFIER_ERR    1907         depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
1970         help                                     1908         help
1971           This option provides the ability to    1909           This option provides the ability to inject artificial errors to
1972           OF reconfig notifier chain callback    1910           OF reconfig notifier chain callbacks.  It is controlled
1973           through debugfs interface under        1911           through debugfs interface under
1974           /sys/kernel/debug/notifier-error-in    1912           /sys/kernel/debug/notifier-error-inject/OF-reconfig/
1975                                                  1913 
1976           If the notifier call chain should b    1914           If the notifier call chain should be failed with some events
1977           notified, write the error code to "    1915           notified, write the error code to "actions/<notifier event>/error".
1978                                                  1916 
1979           To compile this code as a module, c    1917           To compile this code as a module, choose M here: the module will
1980           be called of-reconfig-notifier-erro    1918           be called of-reconfig-notifier-error-inject.
1981                                                  1919 
1982           If unsure, say N.                      1920           If unsure, say N.
1983                                                  1921 
1984 config NETDEV_NOTIFIER_ERROR_INJECT              1922 config NETDEV_NOTIFIER_ERROR_INJECT
1985         tristate "Netdev notifier error injec    1923         tristate "Netdev notifier error injection module"
1986         depends on NET && NOTIFIER_ERROR_INJE    1924         depends on NET && NOTIFIER_ERROR_INJECTION
1987         help                                     1925         help
1988           This option provides the ability to    1926           This option provides the ability to inject artificial errors to
1989           netdevice notifier chain callbacks.    1927           netdevice notifier chain callbacks.  It is controlled through debugfs
1990           interface /sys/kernel/debug/notifie    1928           interface /sys/kernel/debug/notifier-error-inject/netdev
1991                                                  1929 
1992           If the notifier call chain should b    1930           If the notifier call chain should be failed with some events
1993           notified, write the error code to "    1931           notified, write the error code to "actions/<notifier event>/error".
1994                                                  1932 
1995           Example: Inject netdevice mtu chang    1933           Example: Inject netdevice mtu change error (-22 = -EINVAL)
1996                                                  1934 
1997           # cd /sys/kernel/debug/notifier-err    1935           # cd /sys/kernel/debug/notifier-error-inject/netdev
1998           # echo -22 > actions/NETDEV_CHANGEM    1936           # echo -22 > actions/NETDEV_CHANGEMTU/error
1999           # ip link set eth0 mtu 1024            1937           # ip link set eth0 mtu 1024
2000           RTNETLINK answers: Invalid argument    1938           RTNETLINK answers: Invalid argument
2001                                                  1939 
2002           To compile this code as a module, c    1940           To compile this code as a module, choose M here: the module will
2003           be called netdev-notifier-error-inj    1941           be called netdev-notifier-error-inject.
2004                                                  1942 
2005           If unsure, say N.                      1943           If unsure, say N.
2006                                                  1944 
2007 config FUNCTION_ERROR_INJECTION                  1945 config FUNCTION_ERROR_INJECTION
2008         bool "Fault-injections of functions"     1946         bool "Fault-injections of functions"
2009         depends on HAVE_FUNCTION_ERROR_INJECT    1947         depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
2010         help                                     1948         help
2011           Add fault injections into various f    1949           Add fault injections into various functions that are annotated with
2012           ALLOW_ERROR_INJECTION() in the kern    1950           ALLOW_ERROR_INJECTION() in the kernel. BPF may also modify the return
2013           value of these functions. This is u    1951           value of these functions. This is useful to test error paths of code.
2014                                                  1952 
2015           If unsure, say N                       1953           If unsure, say N
2016                                                  1954 
2017 config FAULT_INJECTION                           1955 config FAULT_INJECTION
2018         bool "Fault-injection framework"         1956         bool "Fault-injection framework"
2019         depends on DEBUG_KERNEL                  1957         depends on DEBUG_KERNEL
2020         help                                     1958         help
2021           Provide fault-injection framework.     1959           Provide fault-injection framework.
2022           For more details, see Documentation    1960           For more details, see Documentation/fault-injection/.
2023                                                  1961 
2024 config FAILSLAB                                  1962 config FAILSLAB
2025         bool "Fault-injection capability for     1963         bool "Fault-injection capability for kmalloc"
2026         depends on FAULT_INJECTION               1964         depends on FAULT_INJECTION
                                                   >> 1965         depends on SLAB || SLUB
2027         help                                     1966         help
2028           Provide fault-injection capability     1967           Provide fault-injection capability for kmalloc.
2029                                                  1968 
2030 config FAIL_PAGE_ALLOC                           1969 config FAIL_PAGE_ALLOC
2031         bool "Fault-injection capability for     1970         bool "Fault-injection capability for alloc_pages()"
2032         depends on FAULT_INJECTION               1971         depends on FAULT_INJECTION
2033         help                                     1972         help
2034           Provide fault-injection capability     1973           Provide fault-injection capability for alloc_pages().
2035                                                  1974 
2036 config FAULT_INJECTION_USERCOPY                  1975 config FAULT_INJECTION_USERCOPY
2037         bool "Fault injection capability for     1976         bool "Fault injection capability for usercopy functions"
2038         depends on FAULT_INJECTION               1977         depends on FAULT_INJECTION
2039         help                                     1978         help
2040           Provides fault-injection capability    1979           Provides fault-injection capability to inject failures
2041           in usercopy functions (copy_from_us    1980           in usercopy functions (copy_from_user(), get_user(), ...).
2042                                                  1981 
2043 config FAIL_MAKE_REQUEST                         1982 config FAIL_MAKE_REQUEST
2044         bool "Fault-injection capability for     1983         bool "Fault-injection capability for disk IO"
2045         depends on FAULT_INJECTION && BLOCK      1984         depends on FAULT_INJECTION && BLOCK
2046         help                                     1985         help
2047           Provide fault-injection capability     1986           Provide fault-injection capability for disk IO.
2048                                                  1987 
2049 config FAIL_IO_TIMEOUT                           1988 config FAIL_IO_TIMEOUT
2050         bool "Fault-injection capability for     1989         bool "Fault-injection capability for faking disk interrupts"
2051         depends on FAULT_INJECTION && BLOCK      1990         depends on FAULT_INJECTION && BLOCK
2052         help                                     1991         help
2053           Provide fault-injection capability     1992           Provide fault-injection capability on end IO handling. This
2054           will make the block layer "forget"     1993           will make the block layer "forget" an interrupt as configured,
2055           thus exercising the error handling.    1994           thus exercising the error handling.
2056                                                  1995 
2057           Only works with drivers that use th    1996           Only works with drivers that use the generic timeout handling,
2058           for others it won't do anything.       1997           for others it won't do anything.
2059                                                  1998 
2060 config FAIL_FUTEX                                1999 config FAIL_FUTEX
2061         bool "Fault-injection capability for     2000         bool "Fault-injection capability for futexes"
2062         select DEBUG_FS                          2001         select DEBUG_FS
2063         depends on FAULT_INJECTION && FUTEX      2002         depends on FAULT_INJECTION && FUTEX
2064         help                                     2003         help
2065           Provide fault-injection capability     2004           Provide fault-injection capability for futexes.
2066                                                  2005 
2067 config FAULT_INJECTION_DEBUG_FS                  2006 config FAULT_INJECTION_DEBUG_FS
2068         bool "Debugfs entries for fault-injec    2007         bool "Debugfs entries for fault-injection capabilities"
2069         depends on FAULT_INJECTION && SYSFS &    2008         depends on FAULT_INJECTION && SYSFS && DEBUG_FS
2070         help                                     2009         help
2071           Enable configuration of fault-injec    2010           Enable configuration of fault-injection capabilities via debugfs.
2072                                                  2011 
2073 config FAIL_FUNCTION                             2012 config FAIL_FUNCTION
2074         bool "Fault-injection capability for     2013         bool "Fault-injection capability for functions"
2075         depends on FAULT_INJECTION_DEBUG_FS &    2014         depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
2076         help                                     2015         help
2077           Provide function-based fault-inject    2016           Provide function-based fault-injection capability.
2078           This will allow you to override a s    2017           This will allow you to override a specific function with a return
2079           with given return value. As a resul    2018           with given return value. As a result, function caller will see
2080           an error value and have to handle i    2019           an error value and have to handle it. This is useful to test the
2081           error handling in various subsystem    2020           error handling in various subsystems.
2082                                                  2021 
2083 config FAIL_MMC_REQUEST                          2022 config FAIL_MMC_REQUEST
2084         bool "Fault-injection capability for     2023         bool "Fault-injection capability for MMC IO"
2085         depends on FAULT_INJECTION_DEBUG_FS &    2024         depends on FAULT_INJECTION_DEBUG_FS && MMC
2086         help                                     2025         help
2087           Provide fault-injection capability     2026           Provide fault-injection capability for MMC IO.
2088           This will make the mmc core return     2027           This will make the mmc core return data errors. This is
2089           useful to test the error handling i    2028           useful to test the error handling in the mmc block device
2090           and to test how the mmc host driver    2029           and to test how the mmc host driver handles retries from
2091           the block device.                      2030           the block device.
2092                                                  2031 
2093 config FAIL_SUNRPC                               2032 config FAIL_SUNRPC
2094         bool "Fault-injection capability for     2033         bool "Fault-injection capability for SunRPC"
2095         depends on FAULT_INJECTION_DEBUG_FS &    2034         depends on FAULT_INJECTION_DEBUG_FS && SUNRPC_DEBUG
2096         help                                     2035         help
2097           Provide fault-injection capability     2036           Provide fault-injection capability for SunRPC and
2098           its consumers.                         2037           its consumers.
2099                                                  2038 
2100 config FAULT_INJECTION_CONFIGFS                  2039 config FAULT_INJECTION_CONFIGFS
2101         bool "Configfs interface for fault-in    2040         bool "Configfs interface for fault-injection capabilities"
2102         depends on FAULT_INJECTION               2041         depends on FAULT_INJECTION
2103         select CONFIGFS_FS                       2042         select CONFIGFS_FS
2104         help                                     2043         help
2105           This option allows configfs-based d    2044           This option allows configfs-based drivers to dynamically configure
2106           fault-injection via configfs.  Each    2045           fault-injection via configfs.  Each parameter for driver-specific
2107           fault-injection can be made visible    2046           fault-injection can be made visible as a configfs attribute in a
2108           configfs group.                        2047           configfs group.
2109                                                  2048 
2110                                                  2049 
2111 config FAULT_INJECTION_STACKTRACE_FILTER         2050 config FAULT_INJECTION_STACKTRACE_FILTER
2112         bool "stacktrace filter for fault-inj    2051         bool "stacktrace filter for fault-injection capabilities"
2113         depends on FAULT_INJECTION               2052         depends on FAULT_INJECTION
2114         depends on (FAULT_INJECTION_DEBUG_FS     2053         depends on (FAULT_INJECTION_DEBUG_FS || FAULT_INJECTION_CONFIGFS) && STACKTRACE_SUPPORT
2115         select STACKTRACE                        2054         select STACKTRACE
2116         depends on FRAME_POINTER || MIPS || P    2055         depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
2117         help                                     2056         help
2118           Provide stacktrace filter for fault    2057           Provide stacktrace filter for fault-injection capabilities
2119                                                  2058 
2120 config ARCH_HAS_KCOV                             2059 config ARCH_HAS_KCOV
2121         bool                                     2060         bool
2122         help                                     2061         help
2123           An architecture should select this     2062           An architecture should select this when it can successfully
2124           build and run with CONFIG_KCOV. Thi    2063           build and run with CONFIG_KCOV. This typically requires
2125           disabling instrumentation for some     2064           disabling instrumentation for some early boot code.
2126                                                  2065 
2127 config CC_HAS_SANCOV_TRACE_PC                    2066 config CC_HAS_SANCOV_TRACE_PC
2128         def_bool $(cc-option,-fsanitize-cover    2067         def_bool $(cc-option,-fsanitize-coverage=trace-pc)
2129                                                  2068 
2130                                                  2069 
2131 config KCOV                                      2070 config KCOV
2132         bool "Code coverage for fuzzing"         2071         bool "Code coverage for fuzzing"
2133         depends on ARCH_HAS_KCOV                 2072         depends on ARCH_HAS_KCOV
2134         depends on CC_HAS_SANCOV_TRACE_PC ||     2073         depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
2135         depends on !ARCH_WANTS_NO_INSTR || HA    2074         depends on !ARCH_WANTS_NO_INSTR || HAVE_NOINSTR_HACK || \
2136                    GCC_VERSION >= 120000 || C !! 2075                    GCC_VERSION >= 120000 || CLANG_VERSION >= 130000
2137         select DEBUG_FS                          2076         select DEBUG_FS
2138         select GCC_PLUGIN_SANCOV if !CC_HAS_S    2077         select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
2139         select OBJTOOL if HAVE_NOINSTR_HACK      2078         select OBJTOOL if HAVE_NOINSTR_HACK
2140         help                                     2079         help
2141           KCOV exposes kernel code coverage i    2080           KCOV exposes kernel code coverage information in a form suitable
2142           for coverage-guided fuzzing (random    2081           for coverage-guided fuzzing (randomized testing).
2143                                                  2082 
                                                   >> 2083           If RANDOMIZE_BASE is enabled, PC values will not be stable across
                                                   >> 2084           different machines and across reboots. If you need stable PC values,
                                                   >> 2085           disable RANDOMIZE_BASE.
                                                   >> 2086 
2144           For more details, see Documentation    2087           For more details, see Documentation/dev-tools/kcov.rst.
2145                                                  2088 
2146 config KCOV_ENABLE_COMPARISONS                   2089 config KCOV_ENABLE_COMPARISONS
2147         bool "Enable comparison operands coll    2090         bool "Enable comparison operands collection by KCOV"
2148         depends on KCOV                          2091         depends on KCOV
2149         depends on $(cc-option,-fsanitize-cov    2092         depends on $(cc-option,-fsanitize-coverage=trace-cmp)
2150         help                                     2093         help
2151           KCOV also exposes operands of every    2094           KCOV also exposes operands of every comparison in the instrumented
2152           code along with operand sizes and P    2095           code along with operand sizes and PCs of the comparison instructions.
2153           These operands can be used by fuzzi    2096           These operands can be used by fuzzing engines to improve the quality
2154           of fuzzing coverage.                   2097           of fuzzing coverage.
2155                                                  2098 
2156 config KCOV_INSTRUMENT_ALL                       2099 config KCOV_INSTRUMENT_ALL
2157         bool "Instrument all code by default"    2100         bool "Instrument all code by default"
2158         depends on KCOV                          2101         depends on KCOV
2159         default y                                2102         default y
2160         help                                     2103         help
2161           If you are doing generic system cal    2104           If you are doing generic system call fuzzing (like e.g. syzkaller),
2162           then you will want to instrument th    2105           then you will want to instrument the whole kernel and you should
2163           say y here. If you are doing more t    2106           say y here. If you are doing more targeted fuzzing (like e.g.
2164           filesystem fuzzing with AFL) then y    2107           filesystem fuzzing with AFL) then you will want to enable coverage
2165           for more specific subsets of files,    2108           for more specific subsets of files, and should say n here.
2166                                                  2109 
2167 config KCOV_IRQ_AREA_SIZE                        2110 config KCOV_IRQ_AREA_SIZE
2168         hex "Size of interrupt coverage colle    2111         hex "Size of interrupt coverage collection area in words"
2169         depends on KCOV                          2112         depends on KCOV
2170         default 0x40000                          2113         default 0x40000
2171         help                                     2114         help
2172           KCOV uses preallocated per-cpu area    2115           KCOV uses preallocated per-cpu areas to collect coverage from
2173           soft interrupts. This specifies the    2116           soft interrupts. This specifies the size of those areas in the
2174           number of unsigned long words.         2117           number of unsigned long words.
2175                                                  2118 
2176 menuconfig RUNTIME_TESTING_MENU                  2119 menuconfig RUNTIME_TESTING_MENU
2177         bool "Runtime Testing"                   2120         bool "Runtime Testing"
2178         default y                             !! 2121         def_bool y
2179                                                  2122 
2180 if RUNTIME_TESTING_MENU                          2123 if RUNTIME_TESTING_MENU
2181                                                  2124 
2182 config TEST_DHRY                                 2125 config TEST_DHRY
2183         tristate "Dhrystone benchmark test"      2126         tristate "Dhrystone benchmark test"
2184         help                                     2127         help
2185           Enable this to include the Dhryston    2128           Enable this to include the Dhrystone 2.1 benchmark.  This test
2186           calculates the number of Dhrystones    2129           calculates the number of Dhrystones per second, and the number of
2187           DMIPS (Dhrystone MIPS) obtained whe    2130           DMIPS (Dhrystone MIPS) obtained when the Dhrystone score is divided
2188           by 1757 (the number of Dhrystones p    2131           by 1757 (the number of Dhrystones per second obtained on the VAX
2189           11/780, nominally a 1 MIPS machine)    2132           11/780, nominally a 1 MIPS machine).
2190                                                  2133 
2191           To run the benchmark, it needs to b    2134           To run the benchmark, it needs to be enabled explicitly, either from
2192           the kernel command line (when built    2135           the kernel command line (when built-in), or from userspace (when
2193           built-in or modular).               !! 2136           built-in or modular.
2194                                                  2137 
2195           Run once during kernel boot:           2138           Run once during kernel boot:
2196                                                  2139 
2197               test_dhry.run                      2140               test_dhry.run
2198                                                  2141 
2199           Set number of iterations from kerne    2142           Set number of iterations from kernel command line:
2200                                                  2143 
2201               test_dhry.iterations=<n>           2144               test_dhry.iterations=<n>
2202                                                  2145 
2203           Set number of iterations from users    2146           Set number of iterations from userspace:
2204                                                  2147 
2205               echo <n> > /sys/module/test_dhr    2148               echo <n> > /sys/module/test_dhry/parameters/iterations
2206                                                  2149 
2207           Trigger manual run from userspace:     2150           Trigger manual run from userspace:
2208                                                  2151 
2209               echo y > /sys/module/test_dhry/    2152               echo y > /sys/module/test_dhry/parameters/run
2210                                                  2153 
2211           If the number of iterations is <= 0    2154           If the number of iterations is <= 0, the test will devise a suitable
2212           number of iterations (test runs for    2155           number of iterations (test runs for at least 2s) automatically.
2213           This process takes ca. 4s.             2156           This process takes ca. 4s.
2214                                                  2157 
2215           If unsure, say N.                      2158           If unsure, say N.
2216                                                  2159 
2217 config LKDTM                                     2160 config LKDTM
2218         tristate "Linux Kernel Dump Test Tool    2161         tristate "Linux Kernel Dump Test Tool Module"
2219         depends on DEBUG_FS                      2162         depends on DEBUG_FS
2220         help                                     2163         help
2221         This module enables testing of the di    2164         This module enables testing of the different dumping mechanisms by
2222         inducing system failures at predefine    2165         inducing system failures at predefined crash points.
2223         If you don't need it: say N              2166         If you don't need it: say N
2224         Choose M here to compile this code as    2167         Choose M here to compile this code as a module. The module will be
2225         called lkdtm.                            2168         called lkdtm.
2226                                                  2169 
2227         Documentation on how to use the modul    2170         Documentation on how to use the module can be found in
2228         Documentation/fault-injection/provoke    2171         Documentation/fault-injection/provoke-crashes.rst
2229                                                  2172 
2230 config CPUMASK_KUNIT_TEST                        2173 config CPUMASK_KUNIT_TEST
2231         tristate "KUnit test for cpumask" if     2174         tristate "KUnit test for cpumask" if !KUNIT_ALL_TESTS
2232         depends on KUNIT                         2175         depends on KUNIT
2233         default KUNIT_ALL_TESTS                  2176         default KUNIT_ALL_TESTS
2234         help                                     2177         help
2235           Enable to turn on cpumask tests, ru    2178           Enable to turn on cpumask tests, running at boot or module load time.
2236                                                  2179 
2237           For more information on KUnit and u    2180           For more information on KUnit and unit tests in general, please refer
2238           to the KUnit documentation in Docum    2181           to the KUnit documentation in Documentation/dev-tools/kunit/.
2239                                                  2182 
2240           If unsure, say N.                      2183           If unsure, say N.
2241                                                  2184 
2242 config TEST_LIST_SORT                            2185 config TEST_LIST_SORT
2243         tristate "Linked list sorting test" i    2186         tristate "Linked list sorting test" if !KUNIT_ALL_TESTS
2244         depends on KUNIT                         2187         depends on KUNIT
2245         default KUNIT_ALL_TESTS                  2188         default KUNIT_ALL_TESTS
2246         help                                     2189         help
2247           Enable this to turn on 'list_sort()    2190           Enable this to turn on 'list_sort()' function test. This test is
2248           executed only once during system bo    2191           executed only once during system boot (so affects only boot time),
2249           or at module load time.                2192           or at module load time.
2250                                                  2193 
2251           If unsure, say N.                      2194           If unsure, say N.
2252                                                  2195 
2253 config TEST_MIN_HEAP                             2196 config TEST_MIN_HEAP
2254         tristate "Min heap test"                 2197         tristate "Min heap test"
2255         depends on DEBUG_KERNEL || m             2198         depends on DEBUG_KERNEL || m
2256         help                                     2199         help
2257           Enable this to turn on min heap fun    2200           Enable this to turn on min heap function tests. This test is
2258           executed only once during system bo    2201           executed only once during system boot (so affects only boot time),
2259           or at module load time.                2202           or at module load time.
2260                                                  2203 
2261           If unsure, say N.                      2204           If unsure, say N.
2262                                                  2205 
2263 config TEST_SORT                                 2206 config TEST_SORT
2264         tristate "Array-based sort test" if !    2207         tristate "Array-based sort test" if !KUNIT_ALL_TESTS
2265         depends on KUNIT                         2208         depends on KUNIT
2266         default KUNIT_ALL_TESTS                  2209         default KUNIT_ALL_TESTS
2267         help                                     2210         help
2268           This option enables the self-test f    2211           This option enables the self-test function of 'sort()' at boot,
2269           or at module load time.                2212           or at module load time.
2270                                                  2213 
2271           If unsure, say N.                      2214           If unsure, say N.
2272                                                  2215 
2273 config TEST_DIV64                                2216 config TEST_DIV64
2274         tristate "64bit/32bit division and mo    2217         tristate "64bit/32bit division and modulo test"
2275         depends on DEBUG_KERNEL || m             2218         depends on DEBUG_KERNEL || m
2276         help                                     2219         help
2277           Enable this to turn on 'do_div()' f    2220           Enable this to turn on 'do_div()' function test. This test is
2278           executed only once during system bo    2221           executed only once during system boot (so affects only boot time),
2279           or at module load time.                2222           or at module load time.
2280                                                  2223 
2281           If unsure, say N.                      2224           If unsure, say N.
2282                                                  2225 
2283 config TEST_IOV_ITER                             2226 config TEST_IOV_ITER
2284         tristate "Test iov_iter operation" if    2227         tristate "Test iov_iter operation" if !KUNIT_ALL_TESTS
2285         depends on KUNIT                         2228         depends on KUNIT
2286         depends on MMU                           2229         depends on MMU
2287         default KUNIT_ALL_TESTS                  2230         default KUNIT_ALL_TESTS
2288         help                                     2231         help
2289           Enable this to turn on testing of t    2232           Enable this to turn on testing of the operation of the I/O iterator
2290           (iov_iter). This test is executed o    2233           (iov_iter). This test is executed only once during system boot (so
2291           affects only boot time), or at modu    2234           affects only boot time), or at module load time.
2292                                                  2235 
2293           If unsure, say N.                      2236           If unsure, say N.
2294                                                  2237 
2295 config KPROBES_SANITY_TEST                       2238 config KPROBES_SANITY_TEST
2296         tristate "Kprobes sanity tests" if !K    2239         tristate "Kprobes sanity tests" if !KUNIT_ALL_TESTS
2297         depends on DEBUG_KERNEL                  2240         depends on DEBUG_KERNEL
2298         depends on KPROBES                       2241         depends on KPROBES
2299         depends on KUNIT                         2242         depends on KUNIT
2300         select STACKTRACE if ARCH_CORRECT_STA    2243         select STACKTRACE if ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
2301         default KUNIT_ALL_TESTS                  2244         default KUNIT_ALL_TESTS
2302         help                                     2245         help
2303           This option provides for testing ba    2246           This option provides for testing basic kprobes functionality on
2304           boot. Samples of kprobe and kretpro    2247           boot. Samples of kprobe and kretprobe are inserted and
2305           verified for functionality.            2248           verified for functionality.
2306                                                  2249 
2307           Say N if you are unsure.               2250           Say N if you are unsure.
2308                                                  2251 
2309 config FPROBE_SANITY_TEST                        2252 config FPROBE_SANITY_TEST
2310         bool "Self test for fprobe"              2253         bool "Self test for fprobe"
2311         depends on DEBUG_KERNEL                  2254         depends on DEBUG_KERNEL
2312         depends on FPROBE                        2255         depends on FPROBE
2313         depends on KUNIT=y                       2256         depends on KUNIT=y
2314         help                                     2257         help
2315           This option will enable testing the    2258           This option will enable testing the fprobe when the system boot.
2316           A series of tests are made to verif    2259           A series of tests are made to verify that the fprobe is functioning
2317           properly.                              2260           properly.
2318                                                  2261 
2319           Say N if you are unsure.               2262           Say N if you are unsure.
2320                                                  2263 
2321 config BACKTRACE_SELF_TEST                       2264 config BACKTRACE_SELF_TEST
2322         tristate "Self test for the backtrace    2265         tristate "Self test for the backtrace code"
2323         depends on DEBUG_KERNEL                  2266         depends on DEBUG_KERNEL
2324         help                                     2267         help
2325           This option provides a kernel modul    2268           This option provides a kernel module that can be used to test
2326           the kernel stack backtrace code. Th    2269           the kernel stack backtrace code. This option is not useful
2327           for distributions or general kernel    2270           for distributions or general kernels, but only for kernel
2328           developers working on architecture     2271           developers working on architecture code.
2329                                                  2272 
2330           Note that if you want to also test     2273           Note that if you want to also test saved backtraces, you will
2331           have to enable STACKTRACE as well.     2274           have to enable STACKTRACE as well.
2332                                                  2275 
2333           Say N if you are unsure.               2276           Say N if you are unsure.
2334                                                  2277 
2335 config TEST_REF_TRACKER                          2278 config TEST_REF_TRACKER
2336         tristate "Self test for reference tra    2279         tristate "Self test for reference tracker"
2337         depends on DEBUG_KERNEL && STACKTRACE    2280         depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
2338         select REF_TRACKER                       2281         select REF_TRACKER
2339         help                                     2282         help
2340           This option provides a kernel modul    2283           This option provides a kernel module performing tests
2341           using reference tracker infrastruct    2284           using reference tracker infrastructure.
2342                                                  2285 
2343           Say N if you are unsure.               2286           Say N if you are unsure.
2344                                                  2287 
2345 config RBTREE_TEST                               2288 config RBTREE_TEST
2346         tristate "Red-Black tree test"           2289         tristate "Red-Black tree test"
2347         depends on DEBUG_KERNEL                  2290         depends on DEBUG_KERNEL
2348         help                                     2291         help
2349           A benchmark measuring the performan    2292           A benchmark measuring the performance of the rbtree library.
2350           Also includes rbtree invariant chec    2293           Also includes rbtree invariant checks.
2351                                                  2294 
2352 config REED_SOLOMON_TEST                         2295 config REED_SOLOMON_TEST
2353         tristate "Reed-Solomon library test"     2296         tristate "Reed-Solomon library test"
2354         depends on DEBUG_KERNEL || m             2297         depends on DEBUG_KERNEL || m
2355         select REED_SOLOMON                      2298         select REED_SOLOMON
2356         select REED_SOLOMON_ENC16                2299         select REED_SOLOMON_ENC16
2357         select REED_SOLOMON_DEC16                2300         select REED_SOLOMON_DEC16
2358         help                                     2301         help
2359           This option enables the self-test f    2302           This option enables the self-test function of rslib at boot,
2360           or at module load time.                2303           or at module load time.
2361                                                  2304 
2362           If unsure, say N.                      2305           If unsure, say N.
2363                                                  2306 
2364 config INTERVAL_TREE_TEST                        2307 config INTERVAL_TREE_TEST
2365         tristate "Interval tree test"            2308         tristate "Interval tree test"
2366         depends on DEBUG_KERNEL                  2309         depends on DEBUG_KERNEL
2367         select INTERVAL_TREE                     2310         select INTERVAL_TREE
2368         help                                     2311         help
2369           A benchmark measuring the performan    2312           A benchmark measuring the performance of the interval tree library
2370                                                  2313 
2371 config PERCPU_TEST                               2314 config PERCPU_TEST
2372         tristate "Per cpu operations test"       2315         tristate "Per cpu operations test"
2373         depends on m && DEBUG_KERNEL             2316         depends on m && DEBUG_KERNEL
2374         help                                     2317         help
2375           Enable this option to build test mo    2318           Enable this option to build test module which validates per-cpu
2376           operations.                            2319           operations.
2377                                                  2320 
2378           If unsure, say N.                      2321           If unsure, say N.
2379                                                  2322 
2380 config ATOMIC64_SELFTEST                         2323 config ATOMIC64_SELFTEST
2381         tristate "Perform an atomic64_t self-    2324         tristate "Perform an atomic64_t self-test"
2382         help                                     2325         help
2383           Enable this option to test the atom    2326           Enable this option to test the atomic64_t functions at boot or
2384           at module load time.                   2327           at module load time.
2385                                                  2328 
2386           If unsure, say N.                      2329           If unsure, say N.
2387                                                  2330 
2388 config ASYNC_RAID6_TEST                          2331 config ASYNC_RAID6_TEST
2389         tristate "Self test for hardware acce    2332         tristate "Self test for hardware accelerated raid6 recovery"
2390         depends on ASYNC_RAID6_RECOV             2333         depends on ASYNC_RAID6_RECOV
2391         select ASYNC_MEMCPY                      2334         select ASYNC_MEMCPY
2392         help                                     2335         help
2393           This is a one-shot self test that p    2336           This is a one-shot self test that permutes through the
2394           recovery of all the possible two di    2337           recovery of all the possible two disk failure scenarios for a
2395           N-disk array.  Recovery is performe    2338           N-disk array.  Recovery is performed with the asynchronous
2396           raid6 recovery routines, and will o    2339           raid6 recovery routines, and will optionally use an offload
2397           engine if one is available.            2340           engine if one is available.
2398                                                  2341 
2399           If unsure, say N.                      2342           If unsure, say N.
2400                                                  2343 
2401 config TEST_HEXDUMP                              2344 config TEST_HEXDUMP
2402         tristate "Test functions located in t    2345         tristate "Test functions located in the hexdump module at runtime"
2403                                                  2346 
2404 config STRING_KUNIT_TEST                      !! 2347 config STRING_SELFTEST
2405         tristate "KUnit test string functions !! 2348         tristate "Test string functions at runtime"
2406         depends on KUNIT                      << 
2407         default KUNIT_ALL_TESTS               << 
2408                                                  2349 
2409 config STRING_HELPERS_KUNIT_TEST              !! 2350 config TEST_STRING_HELPERS
2410         tristate "KUnit test string helpers a !! 2351         tristate "Test functions located in the string_helpers module at runtime"
2411         depends on KUNIT                      << 
2412         default KUNIT_ALL_TESTS               << 
2413                                                  2352 
2414 config TEST_KSTRTOX                              2353 config TEST_KSTRTOX
2415         tristate "Test kstrto*() family of fu    2354         tristate "Test kstrto*() family of functions at runtime"
2416                                                  2355 
2417 config TEST_PRINTF                               2356 config TEST_PRINTF
2418         tristate "Test printf() family of fun    2357         tristate "Test printf() family of functions at runtime"
2419                                                  2358 
2420 config TEST_SCANF                                2359 config TEST_SCANF
2421         tristate "Test scanf() family of func    2360         tristate "Test scanf() family of functions at runtime"
2422                                                  2361 
2423 config TEST_BITMAP                               2362 config TEST_BITMAP
2424         tristate "Test bitmap_*() family of f    2363         tristate "Test bitmap_*() family of functions at runtime"
2425         help                                     2364         help
2426           Enable this option to test the bitm    2365           Enable this option to test the bitmap functions at boot.
2427                                                  2366 
2428           If unsure, say N.                      2367           If unsure, say N.
2429                                                  2368 
2430 config TEST_UUID                                 2369 config TEST_UUID
2431         tristate "Test functions located in t    2370         tristate "Test functions located in the uuid module at runtime"
2432                                                  2371 
2433 config TEST_XARRAY                               2372 config TEST_XARRAY
2434         tristate "Test the XArray code at run    2373         tristate "Test the XArray code at runtime"
2435                                                  2374 
2436 config TEST_MAPLE_TREE                           2375 config TEST_MAPLE_TREE
2437         tristate "Test the Maple Tree code at    2376         tristate "Test the Maple Tree code at runtime or module load"
2438         help                                     2377         help
2439           Enable this option to test the mapl    2378           Enable this option to test the maple tree code functions at boot, or
2440           when the module is loaded. Enable "    2379           when the module is loaded. Enable "Debug Maple Trees" will enable
2441           more verbose output on failures.       2380           more verbose output on failures.
2442                                                  2381 
2443           If unsure, say N.                      2382           If unsure, say N.
2444                                                  2383 
2445 config TEST_RHASHTABLE                           2384 config TEST_RHASHTABLE
2446         tristate "Perform selftest on resizab    2385         tristate "Perform selftest on resizable hash table"
2447         help                                     2386         help
2448           Enable this option to test the rhas    2387           Enable this option to test the rhashtable functions at boot.
2449                                                  2388 
2450           If unsure, say N.                      2389           If unsure, say N.
2451                                                  2390 
2452 config TEST_IDA                                  2391 config TEST_IDA
2453         tristate "Perform selftest on IDA fun    2392         tristate "Perform selftest on IDA functions"
2454                                                  2393 
2455 config TEST_PARMAN                               2394 config TEST_PARMAN
2456         tristate "Perform selftest on priorit    2395         tristate "Perform selftest on priority array manager"
2457         depends on PARMAN                        2396         depends on PARMAN
2458         help                                     2397         help
2459           Enable this option to test priority    2398           Enable this option to test priority array manager on boot
2460           (or module load).                      2399           (or module load).
2461                                                  2400 
2462           If unsure, say N.                      2401           If unsure, say N.
2463                                                  2402 
2464 config TEST_IRQ_TIMINGS                          2403 config TEST_IRQ_TIMINGS
2465         bool "IRQ timings selftest"              2404         bool "IRQ timings selftest"
2466         depends on IRQ_TIMINGS                   2405         depends on IRQ_TIMINGS
2467         help                                     2406         help
2468           Enable this option to test the irq     2407           Enable this option to test the irq timings code on boot.
2469                                                  2408 
2470           If unsure, say N.                      2409           If unsure, say N.
2471                                                  2410 
2472 config TEST_LKM                                  2411 config TEST_LKM
2473         tristate "Test module loading with 'h    2412         tristate "Test module loading with 'hello world' module"
2474         depends on m                             2413         depends on m
2475         help                                     2414         help
2476           This builds the "test_module" modul    2415           This builds the "test_module" module that emits "Hello, world"
2477           on printk when loaded. It is design    2416           on printk when loaded. It is designed to be used for basic
2478           evaluation of the module loading su    2417           evaluation of the module loading subsystem (for example when
2479           validating module verification). It    2418           validating module verification). It lacks any extra dependencies,
2480           and will not normally be loaded by     2419           and will not normally be loaded by the system unless explicitly
2481           requested by name.                     2420           requested by name.
2482                                                  2421 
2483           If unsure, say N.                      2422           If unsure, say N.
2484                                                  2423 
2485 config TEST_BITOPS                               2424 config TEST_BITOPS
2486         tristate "Test module for compilation    2425         tristate "Test module for compilation of bitops operations"
                                                   >> 2426         depends on m
2487         help                                     2427         help
2488           This builds the "test_bitops" modul    2428           This builds the "test_bitops" module that is much like the
2489           TEST_LKM module except that it does    2429           TEST_LKM module except that it does a basic exercise of the
2490           set/clear_bit macros and get_count_    2430           set/clear_bit macros and get_count_order/long to make sure there are
2491           no compiler warnings from C=1 spars    2431           no compiler warnings from C=1 sparse checker or -Wextra
2492           compilations. It has no dependencie    2432           compilations. It has no dependencies and doesn't run or load unless
2493           explicitly requested by name.  for     2433           explicitly requested by name.  for example: modprobe test_bitops.
2494                                                  2434 
2495           If unsure, say N.                      2435           If unsure, say N.
2496                                                  2436 
2497 config TEST_VMALLOC                              2437 config TEST_VMALLOC
2498         tristate "Test module for stress/perf    2438         tristate "Test module for stress/performance analysis of vmalloc allocator"
2499         default n                                2439         default n
2500        depends on MMU                            2440        depends on MMU
2501         depends on m                             2441         depends on m
2502         help                                     2442         help
2503           This builds the "test_vmalloc" modu    2443           This builds the "test_vmalloc" module that should be used for
2504           stress and performance analysis. So    2444           stress and performance analysis. So, any new change for vmalloc
2505           subsystem can be evaluated from per    2445           subsystem can be evaluated from performance and stability point
2506           of view.                               2446           of view.
2507                                                  2447 
2508           If unsure, say N.                      2448           If unsure, say N.
2509                                                  2449 
                                                   >> 2450 config TEST_USER_COPY
                                                   >> 2451         tristate "Test user/kernel boundary protections"
                                                   >> 2452         depends on m
                                                   >> 2453         help
                                                   >> 2454           This builds the "test_user_copy" module that runs sanity checks
                                                   >> 2455           on the copy_to/from_user infrastructure, making sure basic
                                                   >> 2456           user/kernel boundary testing is working. If it fails to load,
                                                   >> 2457           a regression has been detected in the user/kernel memory boundary
                                                   >> 2458           protections.
                                                   >> 2459 
                                                   >> 2460           If unsure, say N.
                                                   >> 2461 
2510 config TEST_BPF                                  2462 config TEST_BPF
2511         tristate "Test BPF filter functionali    2463         tristate "Test BPF filter functionality"
2512         depends on m && NET                      2464         depends on m && NET
2513         help                                     2465         help
2514           This builds the "test_bpf" module t    2466           This builds the "test_bpf" module that runs various test vectors
2515           against the BPF interpreter or BPF     2467           against the BPF interpreter or BPF JIT compiler depending on the
2516           current setting. This is in particu    2468           current setting. This is in particular useful for BPF JIT compiler
2517           development, but also to run regres    2469           development, but also to run regression tests against changes in
2518           the interpreter code. It also enabl    2470           the interpreter code. It also enables test stubs for eBPF maps and
2519           verifier used by user space verifie    2471           verifier used by user space verifier testsuite.
2520                                                  2472 
2521           If unsure, say N.                      2473           If unsure, say N.
2522                                                  2474 
2523 config TEST_BLACKHOLE_DEV                        2475 config TEST_BLACKHOLE_DEV
2524         tristate "Test blackhole netdev funct    2476         tristate "Test blackhole netdev functionality"
2525         depends on m && NET                      2477         depends on m && NET
2526         help                                     2478         help
2527           This builds the "test_blackhole_dev    2479           This builds the "test_blackhole_dev" module that validates the
2528           data path through this blackhole ne    2480           data path through this blackhole netdev.
2529                                                  2481 
2530           If unsure, say N.                      2482           If unsure, say N.
2531                                                  2483 
2532 config FIND_BIT_BENCHMARK                        2484 config FIND_BIT_BENCHMARK
2533         tristate "Test find_bit functions"       2485         tristate "Test find_bit functions"
2534         help                                     2486         help
2535           This builds the "test_find_bit" mod    2487           This builds the "test_find_bit" module that measure find_*_bit()
2536           functions performance.                 2488           functions performance.
2537                                                  2489 
2538           If unsure, say N.                      2490           If unsure, say N.
2539                                                  2491 
2540 config TEST_FIRMWARE                             2492 config TEST_FIRMWARE
2541         tristate "Test firmware loading via u    2493         tristate "Test firmware loading via userspace interface"
2542         depends on FW_LOADER                     2494         depends on FW_LOADER
2543         help                                     2495         help
2544           This builds the "test_firmware" mod    2496           This builds the "test_firmware" module that creates a userspace
2545           interface for testing firmware load    2497           interface for testing firmware loading. This can be used to
2546           control the triggering of firmware     2498           control the triggering of firmware loading without needing an
2547           actual firmware-using device. The c    2499           actual firmware-using device. The contents can be rechecked by
2548           userspace.                             2500           userspace.
2549                                                  2501 
2550           If unsure, say N.                      2502           If unsure, say N.
2551                                                  2503 
2552 config TEST_SYSCTL                               2504 config TEST_SYSCTL
2553         tristate "sysctl test driver"            2505         tristate "sysctl test driver"
2554         depends on PROC_SYSCTL                   2506         depends on PROC_SYSCTL
2555         help                                     2507         help
2556           This builds the "test_sysctl" modul    2508           This builds the "test_sysctl" module. This driver enables to test the
2557           proc sysctl interfaces available to    2509           proc sysctl interfaces available to drivers safely without affecting
2558           production knobs which might alter     2510           production knobs which might alter system functionality.
2559                                                  2511 
2560           If unsure, say N.                      2512           If unsure, say N.
2561                                                  2513 
2562 config BITFIELD_KUNIT                            2514 config BITFIELD_KUNIT
2563         tristate "KUnit test bitfield functio    2515         tristate "KUnit test bitfield functions at runtime" if !KUNIT_ALL_TESTS
2564         depends on KUNIT                         2516         depends on KUNIT
2565         default KUNIT_ALL_TESTS                  2517         default KUNIT_ALL_TESTS
2566         help                                     2518         help
2567           Enable this option to test the bitf    2519           Enable this option to test the bitfield functions at boot.
2568                                                  2520 
2569           KUnit tests run during boot and out    2521           KUnit tests run during boot and output the results to the debug log
2570           in TAP format (http://testanything.    2522           in TAP format (http://testanything.org/). Only useful for kernel devs
2571           running the KUnit test harness, and    2523           running the KUnit test harness, and not intended for inclusion into a
2572           production build.                      2524           production build.
2573                                                  2525 
2574           For more information on KUnit and u    2526           For more information on KUnit and unit tests in general please refer
2575           to the KUnit documentation in Docum    2527           to the KUnit documentation in Documentation/dev-tools/kunit/.
2576                                                  2528 
2577           If unsure, say N.                      2529           If unsure, say N.
2578                                                  2530 
2579 config CHECKSUM_KUNIT                            2531 config CHECKSUM_KUNIT
2580         tristate "KUnit test checksum functio    2532         tristate "KUnit test checksum functions at runtime" if !KUNIT_ALL_TESTS
2581         depends on KUNIT                         2533         depends on KUNIT
2582         default KUNIT_ALL_TESTS                  2534         default KUNIT_ALL_TESTS
2583         help                                     2535         help
2584           Enable this option to test the chec    2536           Enable this option to test the checksum functions at boot.
2585                                                  2537 
2586           KUnit tests run during boot and out    2538           KUnit tests run during boot and output the results to the debug log
2587           in TAP format (http://testanything.    2539           in TAP format (http://testanything.org/). Only useful for kernel devs
2588           running the KUnit test harness, and    2540           running the KUnit test harness, and not intended for inclusion into a
2589           production build.                      2541           production build.
2590                                                  2542 
2591           For more information on KUnit and u    2543           For more information on KUnit and unit tests in general please refer
2592           to the KUnit documentation in Docum    2544           to the KUnit documentation in Documentation/dev-tools/kunit/.
2593                                                  2545 
2594           If unsure, say N.                      2546           If unsure, say N.
2595                                                  2547 
2596 config HASH_KUNIT_TEST                           2548 config HASH_KUNIT_TEST
2597         tristate "KUnit Test for integer hash    2549         tristate "KUnit Test for integer hash functions" if !KUNIT_ALL_TESTS
2598         depends on KUNIT                         2550         depends on KUNIT
2599         default KUNIT_ALL_TESTS                  2551         default KUNIT_ALL_TESTS
2600         help                                     2552         help
2601           Enable this option to test the kern    2553           Enable this option to test the kernel's string (<linux/stringhash.h>), and
2602           integer (<linux/hash.h>) hash funct    2554           integer (<linux/hash.h>) hash functions on boot.
2603                                                  2555 
2604           KUnit tests run during boot and out    2556           KUnit tests run during boot and output the results to the debug log
2605           in TAP format (https://testanything    2557           in TAP format (https://testanything.org/). Only useful for kernel devs
2606           running the KUnit test harness, and    2558           running the KUnit test harness, and not intended for inclusion into a
2607           production build.                      2559           production build.
2608                                                  2560 
2609           For more information on KUnit and u    2561           For more information on KUnit and unit tests in general please refer
2610           to the KUnit documentation in Docum    2562           to the KUnit documentation in Documentation/dev-tools/kunit/.
2611                                                  2563 
2612           This is intended to help people wri    2564           This is intended to help people writing architecture-specific
2613           optimized versions. If unsure, say     2565           optimized versions. If unsure, say N.
2614                                                  2566 
2615 config RESOURCE_KUNIT_TEST                       2567 config RESOURCE_KUNIT_TEST
2616         tristate "KUnit test for resource API    2568         tristate "KUnit test for resource API" if !KUNIT_ALL_TESTS
2617         depends on KUNIT                         2569         depends on KUNIT
2618         default KUNIT_ALL_TESTS                  2570         default KUNIT_ALL_TESTS
2619         help                                     2571         help
2620           This builds the resource API unit t    2572           This builds the resource API unit test.
2621           Tests the logic of API provided by     2573           Tests the logic of API provided by resource.c and ioport.h.
2622           For more information on KUnit and u    2574           For more information on KUnit and unit tests in general please refer
2623           to the KUnit documentation in Docum    2575           to the KUnit documentation in Documentation/dev-tools/kunit/.
2624                                                  2576 
2625           If unsure, say N.                      2577           If unsure, say N.
2626                                                  2578 
2627 config SYSCTL_KUNIT_TEST                         2579 config SYSCTL_KUNIT_TEST
2628         tristate "KUnit test for sysctl" if !    2580         tristate "KUnit test for sysctl" if !KUNIT_ALL_TESTS
2629         depends on KUNIT                         2581         depends on KUNIT
2630         default KUNIT_ALL_TESTS                  2582         default KUNIT_ALL_TESTS
2631         help                                     2583         help
2632           This builds the proc sysctl unit te    2584           This builds the proc sysctl unit test, which runs on boot.
2633           Tests the API contract and implemen    2585           Tests the API contract and implementation correctness of sysctl.
2634           For more information on KUnit and u    2586           For more information on KUnit and unit tests in general please refer
2635           to the KUnit documentation in Docum    2587           to the KUnit documentation in Documentation/dev-tools/kunit/.
2636                                                  2588 
2637           If unsure, say N.                      2589           If unsure, say N.
2638                                                  2590 
2639 config LIST_KUNIT_TEST                           2591 config LIST_KUNIT_TEST
2640         tristate "KUnit Test for Kernel Linke    2592         tristate "KUnit Test for Kernel Linked-list structures" if !KUNIT_ALL_TESTS
2641         depends on KUNIT                         2593         depends on KUNIT
2642         default KUNIT_ALL_TESTS                  2594         default KUNIT_ALL_TESTS
2643         help                                     2595         help
2644           This builds the linked list KUnit t    2596           This builds the linked list KUnit test suite.
2645           It tests that the API and basic fun    2597           It tests that the API and basic functionality of the list_head type
2646           and associated macros.                 2598           and associated macros.
2647                                                  2599 
2648           KUnit tests run during boot and out    2600           KUnit tests run during boot and output the results to the debug log
2649           in TAP format (https://testanything    2601           in TAP format (https://testanything.org/). Only useful for kernel devs
2650           running the KUnit test harness, and    2602           running the KUnit test harness, and not intended for inclusion into a
2651           production build.                      2603           production build.
2652                                                  2604 
2653           For more information on KUnit and u    2605           For more information on KUnit and unit tests in general please refer
2654           to the KUnit documentation in Docum    2606           to the KUnit documentation in Documentation/dev-tools/kunit/.
2655                                                  2607 
2656           If unsure, say N.                      2608           If unsure, say N.
2657                                                  2609 
2658 config HASHTABLE_KUNIT_TEST                      2610 config HASHTABLE_KUNIT_TEST
2659         tristate "KUnit Test for Kernel Hasht    2611         tristate "KUnit Test for Kernel Hashtable structures" if !KUNIT_ALL_TESTS
2660         depends on KUNIT                         2612         depends on KUNIT
2661         default KUNIT_ALL_TESTS                  2613         default KUNIT_ALL_TESTS
2662         help                                     2614         help
2663           This builds the hashtable KUnit tes    2615           This builds the hashtable KUnit test suite.
2664           It tests the basic functionality of    2616           It tests the basic functionality of the API defined in
2665           include/linux/hashtable.h. For more    2617           include/linux/hashtable.h. For more information on KUnit and
2666           unit tests in general please refer     2618           unit tests in general please refer to the KUnit documentation
2667           in Documentation/dev-tools/kunit/.     2619           in Documentation/dev-tools/kunit/.
2668                                                  2620 
2669           If unsure, say N.                      2621           If unsure, say N.
2670                                                  2622 
2671 config LINEAR_RANGES_TEST                        2623 config LINEAR_RANGES_TEST
2672         tristate "KUnit test for linear_range    2624         tristate "KUnit test for linear_ranges"
2673         depends on KUNIT                         2625         depends on KUNIT
2674         select LINEAR_RANGES                     2626         select LINEAR_RANGES
2675         help                                     2627         help
2676           This builds the linear_ranges unit     2628           This builds the linear_ranges unit test, which runs on boot.
2677           Tests the linear_ranges logic corre    2629           Tests the linear_ranges logic correctness.
2678           For more information on KUnit and u    2630           For more information on KUnit and unit tests in general please refer
2679           to the KUnit documentation in Docum    2631           to the KUnit documentation in Documentation/dev-tools/kunit/.
2680                                                  2632 
2681           If unsure, say N.                      2633           If unsure, say N.
2682                                                  2634 
2683 config CMDLINE_KUNIT_TEST                        2635 config CMDLINE_KUNIT_TEST
2684         tristate "KUnit test for cmdline API"    2636         tristate "KUnit test for cmdline API" if !KUNIT_ALL_TESTS
2685         depends on KUNIT                         2637         depends on KUNIT
2686         default KUNIT_ALL_TESTS                  2638         default KUNIT_ALL_TESTS
2687         help                                     2639         help
2688           This builds the cmdline API unit te    2640           This builds the cmdline API unit test.
2689           Tests the logic of API provided by     2641           Tests the logic of API provided by cmdline.c.
2690           For more information on KUnit and u    2642           For more information on KUnit and unit tests in general please refer
2691           to the KUnit documentation in Docum    2643           to the KUnit documentation in Documentation/dev-tools/kunit/.
2692                                                  2644 
2693           If unsure, say N.                      2645           If unsure, say N.
2694                                                  2646 
2695 config BITS_TEST                                 2647 config BITS_TEST
2696         tristate "KUnit test for bits.h" if !    2648         tristate "KUnit test for bits.h" if !KUNIT_ALL_TESTS
2697         depends on KUNIT                         2649         depends on KUNIT
2698         default KUNIT_ALL_TESTS                  2650         default KUNIT_ALL_TESTS
2699         help                                     2651         help
2700           This builds the bits unit test.        2652           This builds the bits unit test.
2701           Tests the logic of macros defined i    2653           Tests the logic of macros defined in bits.h.
2702           For more information on KUnit and u    2654           For more information on KUnit and unit tests in general please refer
2703           to the KUnit documentation in Docum    2655           to the KUnit documentation in Documentation/dev-tools/kunit/.
2704                                                  2656 
2705           If unsure, say N.                      2657           If unsure, say N.
2706                                                  2658 
2707 config SLUB_KUNIT_TEST                           2659 config SLUB_KUNIT_TEST
2708         tristate "KUnit test for SLUB cache e    2660         tristate "KUnit test for SLUB cache error detection" if !KUNIT_ALL_TESTS
2709         depends on SLUB_DEBUG && KUNIT           2661         depends on SLUB_DEBUG && KUNIT
2710         default KUNIT_ALL_TESTS                  2662         default KUNIT_ALL_TESTS
2711         help                                     2663         help
2712           This builds SLUB allocator unit tes    2664           This builds SLUB allocator unit test.
2713           Tests SLUB cache debugging function    2665           Tests SLUB cache debugging functionality.
2714           For more information on KUnit and u    2666           For more information on KUnit and unit tests in general please refer
2715           to the KUnit documentation in Docum    2667           to the KUnit documentation in Documentation/dev-tools/kunit/.
2716                                                  2668 
2717           If unsure, say N.                      2669           If unsure, say N.
2718                                                  2670 
2719 config RATIONAL_KUNIT_TEST                       2671 config RATIONAL_KUNIT_TEST
2720         tristate "KUnit test for rational.c"     2672         tristate "KUnit test for rational.c" if !KUNIT_ALL_TESTS
2721         depends on KUNIT && RATIONAL             2673         depends on KUNIT && RATIONAL
2722         default KUNIT_ALL_TESTS                  2674         default KUNIT_ALL_TESTS
2723         help                                     2675         help
2724           This builds the rational math unit     2676           This builds the rational math unit test.
2725           For more information on KUnit and u    2677           For more information on KUnit and unit tests in general please refer
2726           to the KUnit documentation in Docum    2678           to the KUnit documentation in Documentation/dev-tools/kunit/.
2727                                                  2679 
2728           If unsure, say N.                      2680           If unsure, say N.
2729                                                  2681 
2730 config MEMCPY_KUNIT_TEST                         2682 config MEMCPY_KUNIT_TEST
2731         tristate "Test memcpy(), memmove(), a    2683         tristate "Test memcpy(), memmove(), and memset() functions at runtime" if !KUNIT_ALL_TESTS
2732         depends on KUNIT                         2684         depends on KUNIT
2733         default KUNIT_ALL_TESTS                  2685         default KUNIT_ALL_TESTS
2734         help                                     2686         help
2735           Builds unit tests for memcpy(), mem    2687           Builds unit tests for memcpy(), memmove(), and memset() functions.
2736           For more information on KUnit and u    2688           For more information on KUnit and unit tests in general please refer
2737           to the KUnit documentation in Docum    2689           to the KUnit documentation in Documentation/dev-tools/kunit/.
2738                                                  2690 
2739           If unsure, say N.                      2691           If unsure, say N.
2740                                                  2692 
                                                   >> 2693 config MEMCPY_SLOW_KUNIT_TEST
                                                   >> 2694         bool "Include exhaustive memcpy tests"
                                                   >> 2695         depends on MEMCPY_KUNIT_TEST
                                                   >> 2696         default y
                                                   >> 2697         help
                                                   >> 2698           Some memcpy tests are quite exhaustive in checking for overlaps
                                                   >> 2699           and bit ranges. These can be very slow, so they are split out
                                                   >> 2700           as a separate config, in case they need to be disabled.
                                                   >> 2701 
                                                   >> 2702           Note this config option will be replaced by the use of KUnit test
                                                   >> 2703           attributes.
                                                   >> 2704 
2741 config IS_SIGNED_TYPE_KUNIT_TEST                 2705 config IS_SIGNED_TYPE_KUNIT_TEST
2742         tristate "Test is_signed_type() macro    2706         tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
2743         depends on KUNIT                         2707         depends on KUNIT
2744         default KUNIT_ALL_TESTS                  2708         default KUNIT_ALL_TESTS
2745         help                                     2709         help
2746           Builds unit tests for the is_signed    2710           Builds unit tests for the is_signed_type() macro.
2747                                                  2711 
2748           For more information on KUnit and u    2712           For more information on KUnit and unit tests in general please refer
2749           to the KUnit documentation in Docum    2713           to the KUnit documentation in Documentation/dev-tools/kunit/.
2750                                                  2714 
2751           If unsure, say N.                      2715           If unsure, say N.
2752                                                  2716 
2753 config OVERFLOW_KUNIT_TEST                       2717 config OVERFLOW_KUNIT_TEST
2754         tristate "Test check_*_overflow() fun    2718         tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
2755         depends on KUNIT                         2719         depends on KUNIT
2756         default KUNIT_ALL_TESTS                  2720         default KUNIT_ALL_TESTS
2757         help                                     2721         help
2758           Builds unit tests for the check_*_o    2722           Builds unit tests for the check_*_overflow(), size_*(), allocation, and
2759           related functions.                     2723           related functions.
2760                                                  2724 
2761           For more information on KUnit and u    2725           For more information on KUnit and unit tests in general please refer
2762           to the KUnit documentation in Docum    2726           to the KUnit documentation in Documentation/dev-tools/kunit/.
2763                                                  2727 
2764           If unsure, say N.                      2728           If unsure, say N.
2765                                                  2729 
2766 config STACKINIT_KUNIT_TEST                      2730 config STACKINIT_KUNIT_TEST
2767         tristate "Test level of stack variabl    2731         tristate "Test level of stack variable initialization" if !KUNIT_ALL_TESTS
2768         depends on KUNIT                         2732         depends on KUNIT
2769         default KUNIT_ALL_TESTS                  2733         default KUNIT_ALL_TESTS
2770         help                                     2734         help
2771           Test if the kernel is zero-initiali    2735           Test if the kernel is zero-initializing stack variables and
2772           padding. Coverage is controlled by     2736           padding. Coverage is controlled by compiler flags,
2773           CONFIG_INIT_STACK_ALL_PATTERN, CONF    2737           CONFIG_INIT_STACK_ALL_PATTERN, CONFIG_INIT_STACK_ALL_ZERO,
2774           CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFI    2738           CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
2775           or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYR    2739           or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
2776                                                  2740 
2777 config FORTIFY_KUNIT_TEST                        2741 config FORTIFY_KUNIT_TEST
2778         tristate "Test fortified str*() and m    2742         tristate "Test fortified str*() and mem*() function internals at runtime" if !KUNIT_ALL_TESTS
2779         depends on KUNIT                      !! 2743         depends on KUNIT && FORTIFY_SOURCE
2780         default KUNIT_ALL_TESTS                  2744         default KUNIT_ALL_TESTS
2781         help                                     2745         help
2782           Builds unit tests for checking inte    2746           Builds unit tests for checking internals of FORTIFY_SOURCE as used
2783           by the str*() and mem*() family of     2747           by the str*() and mem*() family of functions. For testing runtime
2784           traps of FORTIFY_SOURCE, see LKDTM'    2748           traps of FORTIFY_SOURCE, see LKDTM's "FORTIFY_*" tests.
2785                                                  2749 
2786 config HW_BREAKPOINT_KUNIT_TEST                  2750 config HW_BREAKPOINT_KUNIT_TEST
2787         bool "Test hw_breakpoint constraints     2751         bool "Test hw_breakpoint constraints accounting" if !KUNIT_ALL_TESTS
2788         depends on HAVE_HW_BREAKPOINT            2752         depends on HAVE_HW_BREAKPOINT
2789         depends on KUNIT=y                       2753         depends on KUNIT=y
2790         default KUNIT_ALL_TESTS                  2754         default KUNIT_ALL_TESTS
2791         help                                     2755         help
2792           Tests for hw_breakpoint constraints    2756           Tests for hw_breakpoint constraints accounting.
2793                                                  2757 
2794           If unsure, say N.                      2758           If unsure, say N.
2795                                                  2759 
                                                   >> 2760 config STRCAT_KUNIT_TEST
                                                   >> 2761         tristate "Test strcat() family of functions at runtime" if !KUNIT_ALL_TESTS
                                                   >> 2762         depends on KUNIT
                                                   >> 2763         default KUNIT_ALL_TESTS
                                                   >> 2764 
                                                   >> 2765 config STRSCPY_KUNIT_TEST
                                                   >> 2766         tristate "Test strscpy*() family of functions at runtime" if !KUNIT_ALL_TESTS
                                                   >> 2767         depends on KUNIT
                                                   >> 2768         default KUNIT_ALL_TESTS
                                                   >> 2769 
2796 config SIPHASH_KUNIT_TEST                        2770 config SIPHASH_KUNIT_TEST
2797         tristate "Perform selftest on siphash    2771         tristate "Perform selftest on siphash functions" if !KUNIT_ALL_TESTS
2798         depends on KUNIT                         2772         depends on KUNIT
2799         default KUNIT_ALL_TESTS                  2773         default KUNIT_ALL_TESTS
2800         help                                     2774         help
2801           Enable this option to test the kern    2775           Enable this option to test the kernel's siphash (<linux/siphash.h>) hash
2802           functions on boot (or module load).    2776           functions on boot (or module load).
2803                                                  2777 
2804           This is intended to help people wri    2778           This is intended to help people writing architecture-specific
2805           optimized versions.  If unsure, say    2779           optimized versions.  If unsure, say N.
2806                                                  2780 
2807 config USERCOPY_KUNIT_TEST                    << 
2808         tristate "KUnit Test for user/kernel  << 
2809         depends on KUNIT                      << 
2810         default KUNIT_ALL_TESTS               << 
2811         help                                  << 
2812           This builds the "usercopy_kunit" mo << 
2813           on the copy_to/from_user infrastruc << 
2814           user/kernel boundary testing is wor << 
2815                                               << 
2816 config TEST_UDELAY                               2781 config TEST_UDELAY
2817         tristate "udelay test driver"            2782         tristate "udelay test driver"
2818         help                                     2783         help
2819           This builds the "udelay_test" modul    2784           This builds the "udelay_test" module that helps to make sure
2820           that udelay() is working properly.     2785           that udelay() is working properly.
2821                                                  2786 
2822           If unsure, say N.                      2787           If unsure, say N.
2823                                                  2788 
2824 config TEST_STATIC_KEYS                          2789 config TEST_STATIC_KEYS
2825         tristate "Test static keys"              2790         tristate "Test static keys"
2826         depends on m                             2791         depends on m
2827         help                                     2792         help
2828           Test the static key interfaces.        2793           Test the static key interfaces.
2829                                                  2794 
2830           If unsure, say N.                      2795           If unsure, say N.
2831                                                  2796 
2832 config TEST_DYNAMIC_DEBUG                        2797 config TEST_DYNAMIC_DEBUG
2833         tristate "Test DYNAMIC_DEBUG"            2798         tristate "Test DYNAMIC_DEBUG"
2834         depends on DYNAMIC_DEBUG                 2799         depends on DYNAMIC_DEBUG
2835         help                                     2800         help
2836           This module registers a tracer call    2801           This module registers a tracer callback to count enabled
2837           pr_debugs in a 'do_debugging' funct    2802           pr_debugs in a 'do_debugging' function, then alters their
2838           enablements, calls the function, an    2803           enablements, calls the function, and compares counts.
2839                                                  2804 
2840           If unsure, say N.                      2805           If unsure, say N.
2841                                                  2806 
2842 config TEST_KMOD                                 2807 config TEST_KMOD
2843         tristate "kmod stress tester"            2808         tristate "kmod stress tester"
2844         depends on m                             2809         depends on m
2845         depends on NETDEVICES && NET_CORE &&     2810         depends on NETDEVICES && NET_CORE && INET # for TUN
2846         depends on BLOCK                         2811         depends on BLOCK
2847         depends on PAGE_SIZE_LESS_THAN_256KB     2812         depends on PAGE_SIZE_LESS_THAN_256KB # for BTRFS
2848         select TEST_LKM                          2813         select TEST_LKM
2849         select XFS_FS                            2814         select XFS_FS
2850         select TUN                               2815         select TUN
2851         select BTRFS_FS                          2816         select BTRFS_FS
2852         help                                     2817         help
2853           Test the kernel's module loading me    2818           Test the kernel's module loading mechanism: kmod. kmod implements
2854           support to load modules using the L    2819           support to load modules using the Linux kernel's usermode helper.
2855           This test provides a series of test    2820           This test provides a series of tests against kmod.
2856                                                  2821 
2857           Although technically you can either    2822           Although technically you can either build test_kmod as a module or
2858           into the kernel we disallow buildin    2823           into the kernel we disallow building it into the kernel since
2859           it stress tests request_module() an    2824           it stress tests request_module() and this will very likely cause
2860           some issues by taking over precious    2825           some issues by taking over precious threads available from other
2861           module load requests, ultimately th    2826           module load requests, ultimately this could be fatal.
2862                                                  2827 
2863           To run tests run:                      2828           To run tests run:
2864                                                  2829 
2865           tools/testing/selftests/kmod/kmod.s    2830           tools/testing/selftests/kmod/kmod.sh --help
2866                                                  2831 
2867           If unsure, say N.                      2832           If unsure, say N.
2868                                                  2833 
2869 config TEST_DEBUG_VIRTUAL                        2834 config TEST_DEBUG_VIRTUAL
2870         tristate "Test CONFIG_DEBUG_VIRTUAL f    2835         tristate "Test CONFIG_DEBUG_VIRTUAL feature"
2871         depends on DEBUG_VIRTUAL                 2836         depends on DEBUG_VIRTUAL
2872         help                                     2837         help
2873           Test the kernel's ability to detect    2838           Test the kernel's ability to detect incorrect calls to
2874           virt_to_phys() done against the non    2839           virt_to_phys() done against the non-linear part of the
2875           kernel's virtual address map.          2840           kernel's virtual address map.
2876                                                  2841 
2877           If unsure, say N.                      2842           If unsure, say N.
2878                                                  2843 
2879 config TEST_MEMCAT_P                             2844 config TEST_MEMCAT_P
2880         tristate "Test memcat_p() helper func    2845         tristate "Test memcat_p() helper function"
2881         help                                     2846         help
2882           Test the memcat_p() helper for corr    2847           Test the memcat_p() helper for correctly merging two
2883           pointer arrays together.               2848           pointer arrays together.
2884                                                  2849 
2885           If unsure, say N.                      2850           If unsure, say N.
2886                                                  2851 
                                                   >> 2852 config TEST_LIVEPATCH
                                                   >> 2853         tristate "Test livepatching"
                                                   >> 2854         default n
                                                   >> 2855         depends on DYNAMIC_DEBUG
                                                   >> 2856         depends on LIVEPATCH
                                                   >> 2857         depends on m
                                                   >> 2858         help
                                                   >> 2859           Test kernel livepatching features for correctness.  The tests will
                                                   >> 2860           load test modules that will be livepatched in various scenarios.
                                                   >> 2861 
                                                   >> 2862           To run all the livepatching tests:
                                                   >> 2863 
                                                   >> 2864           make -C tools/testing/selftests TARGETS=livepatch run_tests
                                                   >> 2865 
                                                   >> 2866           Alternatively, individual tests may be invoked:
                                                   >> 2867 
                                                   >> 2868           tools/testing/selftests/livepatch/test-callbacks.sh
                                                   >> 2869           tools/testing/selftests/livepatch/test-livepatch.sh
                                                   >> 2870           tools/testing/selftests/livepatch/test-shadow-vars.sh
                                                   >> 2871 
                                                   >> 2872           If unsure, say N.
                                                   >> 2873 
2887 config TEST_OBJAGG                               2874 config TEST_OBJAGG
2888         tristate "Perform selftest on object     2875         tristate "Perform selftest on object aggreration manager"
2889         default n                                2876         default n
2890         depends on OBJAGG                        2877         depends on OBJAGG
2891         help                                     2878         help
2892           Enable this option to test object a    2879           Enable this option to test object aggregation manager on boot
2893           (or module load).                      2880           (or module load).
2894                                                  2881 
2895 config TEST_MEMINIT                              2882 config TEST_MEMINIT
2896         tristate "Test heap/page initializati    2883         tristate "Test heap/page initialization"
2897         help                                     2884         help
2898           Test if the kernel is zero-initiali    2885           Test if the kernel is zero-initializing heap and page allocations.
2899           This can be useful to test init_on_    2886           This can be useful to test init_on_alloc and init_on_free features.
2900                                                  2887 
2901           If unsure, say N.                      2888           If unsure, say N.
2902                                                  2889 
2903 config TEST_HMM                                  2890 config TEST_HMM
2904         tristate "Test HMM (Heterogeneous Mem    2891         tristate "Test HMM (Heterogeneous Memory Management)"
2905         depends on TRANSPARENT_HUGEPAGE          2892         depends on TRANSPARENT_HUGEPAGE
2906         depends on DEVICE_PRIVATE                2893         depends on DEVICE_PRIVATE
2907         select HMM_MIRROR                        2894         select HMM_MIRROR
2908         select MMU_NOTIFIER                      2895         select MMU_NOTIFIER
2909         help                                     2896         help
2910           This is a pseudo device driver sole    2897           This is a pseudo device driver solely for testing HMM.
2911           Say M here if you want to build the    2898           Say M here if you want to build the HMM test module.
2912           Doing so will allow you to run tool    2899           Doing so will allow you to run tools/testing/selftest/vm/hmm-tests.
2913                                                  2900 
2914           If unsure, say N.                      2901           If unsure, say N.
2915                                                  2902 
2916 config TEST_FREE_PAGES                           2903 config TEST_FREE_PAGES
2917         tristate "Test freeing pages"            2904         tristate "Test freeing pages"
2918         help                                     2905         help
2919           Test that a memory leak does not oc    2906           Test that a memory leak does not occur due to a race between
2920           freeing a block of pages and a spec    2907           freeing a block of pages and a speculative page reference.
2921           Loading this module is safe if your    2908           Loading this module is safe if your kernel has the bug fixed.
2922           If the bug is not fixed, it will le    2909           If the bug is not fixed, it will leak gigabytes of memory and
2923           probably OOM your system.              2910           probably OOM your system.
2924                                                  2911 
2925 config TEST_FPU                                  2912 config TEST_FPU
2926         tristate "Test floating point operati    2913         tristate "Test floating point operations in kernel space"
2927         depends on ARCH_HAS_KERNEL_FPU_SUPPOR !! 2914         depends on X86 && !KCOV_INSTRUMENT_ALL
2928         help                                     2915         help
2929           Enable this option to add /sys/kern    2916           Enable this option to add /sys/kernel/debug/selftest_helpers/test_fpu
2930           which will trigger a sequence of fl    2917           which will trigger a sequence of floating point operations. This is used
2931           for self-testing floating point con    2918           for self-testing floating point control register setting in
2932           kernel_fpu_begin().                    2919           kernel_fpu_begin().
2933                                                  2920 
2934           If unsure, say N.                      2921           If unsure, say N.
2935                                                  2922 
2936 config TEST_CLOCKSOURCE_WATCHDOG                 2923 config TEST_CLOCKSOURCE_WATCHDOG
2937         tristate "Test clocksource watchdog i    2924         tristate "Test clocksource watchdog in kernel space"
2938         depends on CLOCKSOURCE_WATCHDOG          2925         depends on CLOCKSOURCE_WATCHDOG
2939         help                                     2926         help
2940           Enable this option to create a kern    2927           Enable this option to create a kernel module that will trigger
2941           a test of the clocksource watchdog.    2928           a test of the clocksource watchdog.  This module may be loaded
2942           via modprobe or insmod in which cas    2929           via modprobe or insmod in which case it will run upon being
2943           loaded, or it may be built in, in w    2930           loaded, or it may be built in, in which case it will run
2944           shortly after boot.                    2931           shortly after boot.
2945                                               << 
2946           If unsure, say N.                   << 
2947                                               << 
2948 config TEST_OBJPOOL                           << 
2949         tristate "Test module for correctness << 
2950         default n                             << 
2951         depends on m && DEBUG_KERNEL          << 
2952         help                                  << 
2953           This builds the "test_objpool" modu << 
2954           correctness verification and concur << 
2955           allocation and reclamation.         << 
2956                                                  2932 
2957           If unsure, say N.                      2933           If unsure, say N.
2958                                                  2934 
2959 endif # RUNTIME_TESTING_MENU                     2935 endif # RUNTIME_TESTING_MENU
2960                                                  2936 
2961 config ARCH_USE_MEMTEST                          2937 config ARCH_USE_MEMTEST
2962         bool                                     2938         bool
2963         help                                     2939         help
2964           An architecture should select this     2940           An architecture should select this when it uses early_memtest()
2965           during boot process.                   2941           during boot process.
2966                                                  2942 
2967 config MEMTEST                                   2943 config MEMTEST
2968         bool "Memtest"                           2944         bool "Memtest"
2969         depends on ARCH_USE_MEMTEST              2945         depends on ARCH_USE_MEMTEST
2970         help                                     2946         help
2971           This option adds a kernel parameter    2947           This option adds a kernel parameter 'memtest', which allows memtest
2972           to be set and executed.                2948           to be set and executed.
2973                 memtest=0, mean disabled; --     2949                 memtest=0, mean disabled; -- default
2974                 memtest=1, mean do 1 test pat    2950                 memtest=1, mean do 1 test pattern;
2975                 ...                              2951                 ...
2976                 memtest=17, mean do 17 test p    2952                 memtest=17, mean do 17 test patterns.
2977           If you are unsure how to answer thi    2953           If you are unsure how to answer this question, answer N.
2978                                                  2954 
2979                                                  2955 
2980                                                  2956 
2981 config HYPERV_TESTING                            2957 config HYPERV_TESTING
2982         bool "Microsoft Hyper-V driver testin    2958         bool "Microsoft Hyper-V driver testing"
2983         default n                                2959         default n
2984         depends on HYPERV && DEBUG_FS            2960         depends on HYPERV && DEBUG_FS
2985         help                                     2961         help
2986           Select this option to enable Hyper-    2962           Select this option to enable Hyper-V vmbus testing.
2987                                                  2963 
2988 endmenu # "Kernel Testing and Coverage"          2964 endmenu # "Kernel Testing and Coverage"
2989                                                  2965 
2990 menu "Rust hacking"                              2966 menu "Rust hacking"
2991                                                  2967 
2992 config RUST_DEBUG_ASSERTIONS                     2968 config RUST_DEBUG_ASSERTIONS
2993         bool "Debug assertions"                  2969         bool "Debug assertions"
2994         depends on RUST                          2970         depends on RUST
2995         help                                     2971         help
2996           Enables rustc's `-Cdebug-assertions    2972           Enables rustc's `-Cdebug-assertions` codegen option.
2997                                                  2973 
2998           This flag lets you turn `cfg(debug_    2974           This flag lets you turn `cfg(debug_assertions)` conditional
2999           compilation on or off. This can be     2975           compilation on or off. This can be used to enable extra debugging
3000           code in development but not in prod    2976           code in development but not in production. For example, it controls
3001           the behavior of the standard librar    2977           the behavior of the standard library's `debug_assert!` macro.
3002                                                  2978 
3003           Note that this will apply to all Ru    2979           Note that this will apply to all Rust code, including `core`.
3004                                                  2980 
3005           If unsure, say N.                      2981           If unsure, say N.
3006                                                  2982 
3007 config RUST_OVERFLOW_CHECKS                      2983 config RUST_OVERFLOW_CHECKS
3008         bool "Overflow checks"                   2984         bool "Overflow checks"
3009         default y                                2985         default y
3010         depends on RUST                          2986         depends on RUST
3011         help                                     2987         help
3012           Enables rustc's `-Coverflow-checks`    2988           Enables rustc's `-Coverflow-checks` codegen option.
3013                                                  2989 
3014           This flag allows you to control the    2990           This flag allows you to control the behavior of runtime integer
3015           overflow. When overflow-checks are     2991           overflow. When overflow-checks are enabled, a Rust panic will occur
3016           on overflow.                           2992           on overflow.
3017                                                  2993 
3018           Note that this will apply to all Ru    2994           Note that this will apply to all Rust code, including `core`.
3019                                                  2995 
3020           If unsure, say Y.                      2996           If unsure, say Y.
3021                                                  2997 
3022 config RUST_BUILD_ASSERT_ALLOW                   2998 config RUST_BUILD_ASSERT_ALLOW
3023         bool "Allow unoptimized build-time as    2999         bool "Allow unoptimized build-time assertions"
3024         depends on RUST                          3000         depends on RUST
3025         help                                     3001         help
3026           Controls how are `build_error!` and    3002           Controls how are `build_error!` and `build_assert!` handled during build.
3027                                                  3003 
3028           If calls to them exist in the binar    3004           If calls to them exist in the binary, it may indicate a violated invariant
3029           or that the optimizer failed to ver    3005           or that the optimizer failed to verify the invariant during compilation.
3030                                                  3006 
3031           This should not happen, thus by def    3007           This should not happen, thus by default the build is aborted. However,
3032           as an escape hatch, you can choose     3008           as an escape hatch, you can choose Y here to ignore them during build
3033           and let the check be carried at run    3009           and let the check be carried at runtime (with `panic!` being called if
3034           the check fails).                      3010           the check fails).
3035                                                  3011 
3036           If unsure, say N.                      3012           If unsure, say N.
3037                                                  3013 
3038 config RUST_KERNEL_DOCTESTS                      3014 config RUST_KERNEL_DOCTESTS
3039         bool "Doctests for the `kernel` crate    3015         bool "Doctests for the `kernel` crate" if !KUNIT_ALL_TESTS
3040         depends on RUST && KUNIT=y               3016         depends on RUST && KUNIT=y
3041         default KUNIT_ALL_TESTS                  3017         default KUNIT_ALL_TESTS
3042         help                                     3018         help
3043           This builds the documentation tests    3019           This builds the documentation tests of the `kernel` crate
3044           as KUnit tests.                        3020           as KUnit tests.
3045                                                  3021 
3046           For more information on KUnit and u    3022           For more information on KUnit and unit tests in general,
3047           please refer to the KUnit documenta    3023           please refer to the KUnit documentation in Documentation/dev-tools/kunit/.
3048                                                  3024 
3049           If unsure, say N.                      3025           If unsure, say N.
3050                                                  3026 
3051 endmenu # "Rust"                                 3027 endmenu # "Rust"
3052                                                  3028 
3053 endmenu # Kernel hacking                         3029 endmenu # Kernel hacking
                                                      

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