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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 ] ~
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Diff markup

Differences between /lib/Kconfig.debug (Version linux-6.11.5) and /lib/Kconfig.debug (Version linux-5.6.19)


  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                     << 
 39         bool "Show build ID information in sta << 
 40         depends on PRINTK                      << 
 41         help                                   << 
 42           Selecting this option adds build ID  << 
 43           stacktraces printed with the printk  << 
 44                                                << 
 45           This option is intended for distros  << 
 46           accessible but can be downloaded giv << 
 47           kernel module where the function is  << 
 48                                                << 
 49 config CONSOLE_LOGLEVEL_DEFAULT                    38 config CONSOLE_LOGLEVEL_DEFAULT
 50         int "Default console loglevel (1-15)"      39         int "Default console loglevel (1-15)"
 51         range 1 15                                 40         range 1 15
 52         default "7"                                41         default "7"
 53         help                                       42         help
 54           Default loglevel to determine what w     43           Default loglevel to determine what will be printed on the console.
 55                                                    44 
 56           Setting a default here is equivalent     45           Setting a default here is equivalent to passing in loglevel=<x> in
 57           the kernel bootargs. loglevel=<x> co     46           the kernel bootargs. loglevel=<x> continues to override whatever
 58           value is specified here as well.         47           value is specified here as well.
 59                                                    48 
 60           Note: This does not affect the log l     49           Note: This does not affect the log level of un-prefixed printk()
 61           usage in the kernel. That is control     50           usage in the kernel. That is controlled by the MESSAGE_LOGLEVEL_DEFAULT
 62           option.                                  51           option.
 63                                                    52 
 64 config CONSOLE_LOGLEVEL_QUIET                      53 config CONSOLE_LOGLEVEL_QUIET
 65         int "quiet console loglevel (1-15)"        54         int "quiet console loglevel (1-15)"
 66         range 1 15                                 55         range 1 15
 67         default "4"                                56         default "4"
 68         help                                       57         help
 69           loglevel to use when "quiet" is pass     58           loglevel to use when "quiet" is passed on the kernel commandline.
 70                                                    59 
 71           When "quiet" is passed on the kernel     60           When "quiet" is passed on the kernel commandline this loglevel
 72           will be used as the loglevel. IOW pa     61           will be used as the loglevel. IOW passing "quiet" will be the
 73           equivalent of passing "loglevel=<CON     62           equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"
 74                                                    63 
 75 config MESSAGE_LOGLEVEL_DEFAULT                    64 config MESSAGE_LOGLEVEL_DEFAULT
 76         int "Default message log level (1-7)"      65         int "Default message log level (1-7)"
 77         range 1 7                                  66         range 1 7
 78         default "4"                                67         default "4"
 79         help                                       68         help
 80           Default log level for printk stateme     69           Default log level for printk statements with no specified priority.
 81                                                    70 
 82           This was hard-coded to KERN_WARNING      71           This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
 83           that are auditing their logs closely     72           that are auditing their logs closely may want to set it to a lower
 84           priority.                                73           priority.
 85                                                    74 
 86           Note: This does not affect what mess     75           Note: This does not affect what message level gets printed on the console
 87           by default. To change that, use logl     76           by default. To change that, use loglevel=<x> in the kernel bootargs,
 88           or pick a different CONSOLE_LOGLEVEL     77           or pick a different CONSOLE_LOGLEVEL_DEFAULT configuration value.
 89                                                    78 
 90 config BOOT_PRINTK_DELAY                           79 config BOOT_PRINTK_DELAY
 91         bool "Delay each boot printk message b     80         bool "Delay each boot printk message by N milliseconds"
 92         depends on DEBUG_KERNEL && PRINTK && G     81         depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
 93         help                                       82         help
 94           This build option allows you to read     83           This build option allows you to read kernel boot messages
 95           by inserting a short delay after eac     84           by inserting a short delay after each one.  The delay is
 96           specified in milliseconds on the ker     85           specified in milliseconds on the kernel command line,
 97           using "boot_delay=N".                    86           using "boot_delay=N".
 98                                                    87 
 99           It is likely that you would also nee     88           It is likely that you would also need to use "lpj=M" to preset
100           the "loops per jiffie" value.            89           the "loops per jiffie" value.
101           See a previous boot log for the "lpj     90           See a previous boot log for the "lpj" value to use for your
102           system, and then set "lpj=M" before      91           system, and then set "lpj=M" before setting "boot_delay=N".
103           NOTE:  Using this option may adverse     92           NOTE:  Using this option may adversely affect SMP systems.
104           I.e., processors other than the firs     93           I.e., processors other than the first one may not boot up.
105           BOOT_PRINTK_DELAY also may cause LOC     94           BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
106           what it believes to be lockup condit     95           what it believes to be lockup conditions.
107                                                    96 
108 config DYNAMIC_DEBUG                               97 config DYNAMIC_DEBUG
109         bool "Enable dynamic printk() support"     98         bool "Enable dynamic printk() support"
110         default n                                  99         default n
111         depends on PRINTK                         100         depends on PRINTK
112         depends on (DEBUG_FS || PROC_FS)       !! 101         depends on DEBUG_FS
113         select DYNAMIC_DEBUG_CORE              << 
114         help                                      102         help
115                                                   103 
116           Compiles debug level messages into t    104           Compiles debug level messages into the kernel, which would not
117           otherwise be available at runtime. T    105           otherwise be available at runtime. These messages can then be
118           enabled/disabled based on various le    106           enabled/disabled based on various levels of scope - per source file,
119           function, module, format string, and    107           function, module, format string, and line number. This mechanism
120           implicitly compiles in all pr_debug(    108           implicitly compiles in all pr_debug() and dev_dbg() calls, which
121           enlarges the kernel text size by abo    109           enlarges the kernel text size by about 2%.
122                                                   110 
123           If a source file is compiled with DE    111           If a source file is compiled with DEBUG flag set, any
124           pr_debug() calls in it are enabled b    112           pr_debug() calls in it are enabled by default, but can be
125           disabled at runtime as below.  Note     113           disabled at runtime as below.  Note that DEBUG flag is
126           turned on by many CONFIG_*DEBUG* opt    114           turned on by many CONFIG_*DEBUG* options.
127                                                   115 
128           Usage:                                  116           Usage:
129                                                   117 
130           Dynamic debugging is controlled via     118           Dynamic debugging is controlled via the 'dynamic_debug/control' file,
131           which is contained in the 'debugfs'  !! 119           which is contained in the 'debugfs' filesystem. Thus, the debugfs
132           Thus, the debugfs or procfs filesyst !! 120           filesystem must first be mounted before making use of this feature.
133           making use of this feature.          << 
134           We refer the control file as: <debug    121           We refer the control file as: <debugfs>/dynamic_debug/control. This
135           file contains a list of the debug st    122           file contains a list of the debug statements that can be enabled. The
136           format for each line of the file is:    123           format for each line of the file is:
137                                                   124 
138                 filename:lineno [module]functi    125                 filename:lineno [module]function flags format
139                                                   126 
140           filename : source file of the debug     127           filename : source file of the debug statement
141           lineno : line number of the debug st    128           lineno : line number of the debug statement
142           module : module that contains the de    129           module : module that contains the debug statement
143           function : function that contains th    130           function : function that contains the debug statement
144           flags : '=p' means the line is turne    131           flags : '=p' means the line is turned 'on' for printing
145           format : the format used for the deb    132           format : the format used for the debug statement
146                                                   133 
147           From a live system:                     134           From a live system:
148                                                   135 
149                 nullarbor:~ # cat <debugfs>/dy    136                 nullarbor:~ # cat <debugfs>/dynamic_debug/control
150                 # filename:lineno [module]func    137                 # filename:lineno [module]function flags format
151                 fs/aio.c:222 [aio]__put_ioctx     138                 fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
152                 fs/aio.c:248 [aio]ioctx_alloc     139                 fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
153                 fs/aio.c:1770 [aio]sys_io_canc    140                 fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
154                                                   141 
155           Example usage:                          142           Example usage:
156                                                   143 
157                 // enable the message at line     144                 // enable the message at line 1603 of file svcsock.c
158                 nullarbor:~ # echo -n 'file sv    145                 nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
159                                                   146                                                 <debugfs>/dynamic_debug/control
160                                                   147 
161                 // enable all the messages in     148                 // enable all the messages in file svcsock.c
162                 nullarbor:~ # echo -n 'file sv    149                 nullarbor:~ # echo -n 'file svcsock.c +p' >
163                                                   150                                                 <debugfs>/dynamic_debug/control
164                                                   151 
165                 // enable all the messages in     152                 // enable all the messages in the NFS server module
166                 nullarbor:~ # echo -n 'module     153                 nullarbor:~ # echo -n 'module nfsd +p' >
167                                                   154                                                 <debugfs>/dynamic_debug/control
168                                                   155 
169                 // enable all 12 messages in t    156                 // enable all 12 messages in the function svc_process()
170                 nullarbor:~ # echo -n 'func sv    157                 nullarbor:~ # echo -n 'func svc_process +p' >
171                                                   158                                                 <debugfs>/dynamic_debug/control
172                                                   159 
173                 // disable all 12 messages in     160                 // disable all 12 messages in the function svc_process()
174                 nullarbor:~ # echo -n 'func sv    161                 nullarbor:~ # echo -n 'func svc_process -p' >
175                                                   162                                                 <debugfs>/dynamic_debug/control
176                                                   163 
177           See Documentation/admin-guide/dynami    164           See Documentation/admin-guide/dynamic-debug-howto.rst for additional
178           information.                            165           information.
179                                                   166 
180 config DYNAMIC_DEBUG_CORE                      << 
181         bool "Enable core function of dynamic  << 
182         depends on PRINTK                      << 
183         depends on (DEBUG_FS || PROC_FS)       << 
184         help                                   << 
185           Enable core functional support of dy << 
186           when you want to tie dynamic debug t << 
187           DYNAMIC_DEBUG_MODULE defined for eac << 
188           the case of embedded system where th << 
189           sensitive for people.                << 
190                                                << 
191 config SYMBOLIC_ERRNAME                           167 config SYMBOLIC_ERRNAME
192         bool "Support symbolic error names in     168         bool "Support symbolic error names in printf"
193         default y if PRINTK                       169         default y if PRINTK
194         help                                      170         help
195           If you say Y here, the kernel's prin    171           If you say Y here, the kernel's printf implementation will
196           be able to print symbolic error name    172           be able to print symbolic error names such as ENOSPC instead
197           of the number 28. It makes the kerne    173           of the number 28. It makes the kernel image slightly larger
198           (about 3KB), but can make the kernel    174           (about 3KB), but can make the kernel logs easier to read.
199                                                   175 
200 config DEBUG_BUGVERBOSE                           176 config DEBUG_BUGVERBOSE
201         bool "Verbose BUG() reporting (adds 70    177         bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
202         depends on BUG && (GENERIC_BUG || HAVE    178         depends on BUG && (GENERIC_BUG || HAVE_DEBUG_BUGVERBOSE)
203         default y                                 179         default y
204         help                                      180         help
205           Say Y here to make BUG() panics outp    181           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    182           of the BUG call as well as the EIP and oops trace.  This aids
207           debugging but costs about 70-100K of    183           debugging but costs about 70-100K of memory.
208                                                   184 
209 endmenu # "printk and dmesg options"              185 endmenu # "printk and dmesg options"
210                                                   186 
211 config DEBUG_KERNEL                            << 
212         bool "Kernel debugging"                << 
213         help                                   << 
214           Say Y here if you are developing dri << 
215           identify kernel problems.            << 
216                                                << 
217 config DEBUG_MISC                              << 
218         bool "Miscellaneous debug code"        << 
219         default DEBUG_KERNEL                   << 
220         depends on DEBUG_KERNEL                << 
221         help                                   << 
222           Say Y here if you need to enable mis << 
223           be under a more specific debug optio << 
224                                                << 
225 menu "Compile-time checks and compiler options    187 menu "Compile-time checks and compiler options"
226                                                   188 
227 config DEBUG_INFO                                 189 config DEBUG_INFO
228         bool                                   !! 190         bool "Compile the kernel with debug info"
                                                   >> 191         depends on DEBUG_KERNEL && !COMPILE_TEST
229         help                                      192         help
230           A kernel debug info option other tha !! 193           If you say Y here the resulting kernel image will include
231           in the "Debug information" choice be !! 194           debugging info resulting in a larger kernel image.
232           information will be generated for bu << 
233                                                << 
234 # Clang generates .uleb128 with label differen << 
235 # older binutils ports do not support when uti << 
236 # relaxation: https://sourceware.org/bugzilla/ << 
237 config AS_HAS_NON_CONST_ULEB128                << 
238         def_bool $(as-instr,.uleb128 .Lexpr_en << 
239                                                << 
240 choice                                         << 
241         prompt "Debug information"             << 
242         depends on DEBUG_KERNEL                << 
243         help                                   << 
244           Selecting something other than "None << 
245           that will include debugging info res << 
246           This adds debug symbols to the kerne    195           This adds debug symbols to the kernel and modules (gcc -g), and
247           is needed if you intend to use kerne    196           is needed if you intend to use kernel crashdump or binary object
248           tools like crash, kgdb, LKCD, gdb, e    197           tools like crash, kgdb, LKCD, gdb, etc on the kernel.
                                                   >> 198           Say Y here only if you plan to debug the kernel.
249                                                   199 
250           Choose which version of DWARF debug  !! 200           If unsure, say N.
251           select "Toolchain default".          << 
252                                                << 
253 config DEBUG_INFO_NONE                         << 
254         bool "Disable debug information"       << 
255         help                                   << 
256           Do not build the kernel with debuggi << 
257           result in a faster and smaller build << 
258                                                << 
259 config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT      << 
260         bool "Rely on the toolchain's implicit << 
261         select DEBUG_INFO                      << 
262         depends on !CC_IS_CLANG || AS_IS_LLVM  << 
263         help                                   << 
264           The implicit default version of DWAR << 
265           toolchain changes over time.         << 
266                                                << 
267           This can break consumers of the debu << 
268           support newer revisions, and prevent << 
269           those should be less common scenario << 
270                                                << 
271 config DEBUG_INFO_DWARF4                       << 
272         bool "Generate DWARF Version 4 debugin << 
273         select DEBUG_INFO                      << 
274         depends on !CC_IS_CLANG || AS_IS_LLVM  << 
275         help                                   << 
276           Generate DWARF v4 debug info. This r << 
277           if using clang without clang's integ << 
278                                                << 
279           If you have consumers of DWARF debug << 
280           newer revisions of DWARF, you may wi << 
281           config select this.                  << 
282                                                << 
283 config DEBUG_INFO_DWARF5                       << 
284         bool "Generate DWARF Version 5 debugin << 
285         select DEBUG_INFO                      << 
286         depends on !ARCH_HAS_BROKEN_DWARF5     << 
287         depends on !CC_IS_CLANG || AS_IS_LLVM  << 
288         help                                   << 
289           Generate DWARF v5 debug info. Requir << 
290           5.0+ accepts the -gdwarf-5 flag but  << 
291           draft features until 7.0), and gdb 8 << 
292                                                << 
293           Changes to the structure of debug in << 
294           15-18% savings in resulting image an << 
295           compared to DWARF Version 4. DWARF V << 
296           extensions such as accelerators for  << 
297           for fission (.dwo/.dwp) files. Users << 
298           config if they rely on tooling that  << 
299           support DWARF Version 5.             << 
300                                                << 
301 endchoice # "Debug information"                << 
302                                                << 
303 if DEBUG_INFO                                  << 
304                                                   201 
305 config DEBUG_INFO_REDUCED                         202 config DEBUG_INFO_REDUCED
306         bool "Reduce debugging information"       203         bool "Reduce debugging information"
                                                   >> 204         depends on DEBUG_INFO
307         help                                      205         help
308           If you say Y here gcc is instructed     206           If you say Y here gcc is instructed to generate less debugging
309           information for structure types. Thi    207           information for structure types. This means that tools that
310           need full debugging information (lik    208           need full debugging information (like kgdb or systemtap) won't
311           be happy. But if you merely need deb    209           be happy. But if you merely need debugging information to
312           resolve line numbers there is no los    210           resolve line numbers there is no loss. Advantage is that
313           build directory object sizes shrink     211           build directory object sizes shrink dramatically over a full
314           DEBUG_INFO build and compile times a    212           DEBUG_INFO build and compile times are reduced too.
315           Only works with newer gcc versions.     213           Only works with newer gcc versions.
316                                                   214 
317 choice                                         << 
318         prompt "Compressed Debug information"  << 
319         help                                   << 
320           Compress the resulting debug info. R << 
321           but requires that consumers are able << 
322                                                << 
323           If unsure, choose DEBUG_INFO_COMPRES << 
324                                                << 
325 config DEBUG_INFO_COMPRESSED_NONE              << 
326         bool "Don't compress debug information << 
327         help                                   << 
328           Don't compress debug info sections.  << 
329                                                << 
330 config DEBUG_INFO_COMPRESSED_ZLIB              << 
331         bool "Compress debugging information w << 
332         depends on $(cc-option,-gz=zlib)       << 
333         depends on $(ld-option,--compress-debu << 
334         help                                   << 
335           Compress the debug information using << 
336           5.0+, binutils 2.26+, and zlib.      << 
337                                                << 
338           Users of dpkg-deb via scripts/packag << 
339           size of their debug .deb packages wi << 
340           debug info being compressed with zli << 
341           recompressed with a different compre << 
342           preferable to setting $KDEB_COMPRESS << 
343           larger.                              << 
344                                                << 
345 config DEBUG_INFO_COMPRESSED_ZSTD              << 
346         bool "Compress debugging information w << 
347         depends on $(cc-option,-gz=zstd)       << 
348         depends on $(ld-option,--compress-debu << 
349         help                                   << 
350           Compress the debug information using << 
351           compression than zlib, for about the << 
352           toolchain support.  Requires GCC 13. << 
353           zstd.                                << 
354                                                << 
355 endchoice # "Compressed Debug information"     << 
356                                                << 
357 config DEBUG_INFO_SPLIT                           215 config DEBUG_INFO_SPLIT
358         bool "Produce split debuginfo in .dwo     216         bool "Produce split debuginfo in .dwo files"
                                                   >> 217         depends on DEBUG_INFO
359         depends on $(cc-option,-gsplit-dwarf)     218         depends on $(cc-option,-gsplit-dwarf)
360         # RISC-V linker relaxation + -gsplit-d << 
361         # prior to 12.x:                       << 
362         # https://github.com/llvm/llvm-project << 
363         # https://gcc.gnu.org/bugzilla/show_bu << 
364         depends on !RISCV || GCC_VERSION >= 12 << 
365         help                                      219         help
366           Generate debug info into separate .d    220           Generate debug info into separate .dwo files. This significantly
367           reduces the build directory size for    221           reduces the build directory size for builds with DEBUG_INFO,
368           because it stores the information on    222           because it stores the information only once on disk in .dwo
369           files instead of multiple times in o    223           files instead of multiple times in object files and executables.
370           In addition the debug information is    224           In addition the debug information is also compressed.
371                                                   225 
372           Requires recent gcc (4.7+) and recen    226           Requires recent gcc (4.7+) and recent gdb/binutils.
373           Any tool that packages or reads debu    227           Any tool that packages or reads debug information would need
374           to know about the .dwo files and inc    228           to know about the .dwo files and include them.
375           Incompatible with older versions of     229           Incompatible with older versions of ccache.
376                                                   230 
                                                   >> 231 config DEBUG_INFO_DWARF4
                                                   >> 232         bool "Generate dwarf4 debuginfo"
                                                   >> 233         depends on DEBUG_INFO
                                                   >> 234         depends on $(cc-option,-gdwarf-4)
                                                   >> 235         help
                                                   >> 236           Generate dwarf4 debug info. This requires recent versions
                                                   >> 237           of gcc and gdb. It makes the debug information larger.
                                                   >> 238           But it significantly improves the success of resolving
                                                   >> 239           variables in gdb on optimized code.
                                                   >> 240 
377 config DEBUG_INFO_BTF                             241 config DEBUG_INFO_BTF
378         bool "Generate BTF type information"   !! 242         bool "Generate BTF typeinfo"
                                                   >> 243         depends on DEBUG_INFO
379         depends on !DEBUG_INFO_SPLIT && !DEBUG    244         depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
380         depends on !GCC_PLUGIN_RANDSTRUCT || C    245         depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
381         depends on BPF_SYSCALL                 << 
382         depends on !DEBUG_INFO_DWARF5 || PAHOL << 
383         # pahole uses elfutils, which does not << 
384         depends on !HEXAGON                    << 
385         help                                      246         help
386           Generate deduplicated BTF type infor    247           Generate deduplicated BTF type information from DWARF debug info.
387           Turning this on expects presence of     248           Turning this on expects presence of pahole tool, which will convert
388           DWARF type info into equivalent dedu    249           DWARF type info into equivalent deduplicated BTF type info.
389                                                   250 
390 config PAHOLE_HAS_SPLIT_BTF                    << 
391         def_bool PAHOLE_VERSION >= 119         << 
392                                                << 
393 config PAHOLE_HAS_BTF_TAG                      << 
394         def_bool PAHOLE_VERSION >= 123         << 
395         depends on CC_IS_CLANG                 << 
396         help                                   << 
397           Decide whether pahole emits btf_tag  << 
398           btf_decl_tag) or not. Currently only << 
399           these attributes, so make the config << 
400                                                << 
401 config PAHOLE_HAS_LANG_EXCLUDE                 << 
402         def_bool PAHOLE_VERSION >= 124         << 
403         help                                   << 
404           Support for the --lang_exclude flag  << 
405           compilation units from the supplied  << 
406           omit Rust CUs which are not supporte << 
407           otherwise it would emit malformed ke << 
408           using DEBUG_INFO_BTF_MODULES.        << 
409                                                << 
410 config DEBUG_INFO_BTF_MODULES                  << 
411         bool "Generate BTF type information fo << 
412         default y                              << 
413         depends on DEBUG_INFO_BTF && MODULES & << 
414         help                                   << 
415           Generate compact split BTF type info << 
416                                                << 
417 config MODULE_ALLOW_BTF_MISMATCH               << 
418         bool "Allow loading modules with non-m << 
419         depends on DEBUG_INFO_BTF_MODULES      << 
420         help                                   << 
421           For modules whose split BTF does not << 
422           BTF rather than refusing to load. Th << 
423           module BTF enabled is to reject modu << 
424           this option will still load module B << 
425           it when a mismatch is found.         << 
426                                                << 
427 config GDB_SCRIPTS                                251 config GDB_SCRIPTS
428         bool "Provide GDB scripts for kernel d    252         bool "Provide GDB scripts for kernel debugging"
                                                   >> 253         depends on DEBUG_INFO
429         help                                      254         help
430           This creates the required links to G    255           This creates the required links to GDB helper scripts in the
431           build directory. If you load vmlinux    256           build directory. If you load vmlinux into gdb, the helper
432           scripts will be automatically import    257           scripts will be automatically imported by gdb as well, and
433           additional functions are available t    258           additional functions are available to analyze a Linux kernel
434           instance. See Documentation/dev-tool    259           instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
435           for further details.                    260           for further details.
436                                                   261 
437 endif # DEBUG_INFO                             !! 262 config ENABLE_MUST_CHECK
                                                   >> 263         bool "Enable __must_check logic"
                                                   >> 264         default y
                                                   >> 265         help
                                                   >> 266           Enable the __must_check logic in the kernel build.  Disable this to
                                                   >> 267           suppress the "warning: ignoring return value of 'foo', declared with
                                                   >> 268           attribute warn_unused_result" messages.
438                                                   269 
439 config FRAME_WARN                                 270 config FRAME_WARN
440         int "Warn for stack frames larger than !! 271         int "Warn for stack frames larger than (needs gcc 4.4)"
441         range 0 8192                              272         range 0 8192
442         default 0 if KMSAN                     << 
443         default 2048 if GCC_PLUGIN_LATENT_ENTR    273         default 2048 if GCC_PLUGIN_LATENT_ENTROPY
444         default 2048 if PARISC                 !! 274         default 1280 if (!64BIT && PARISC)
445         default 1536 if (!64BIT && XTENSA)     !! 275         default 1024 if (!64BIT && !PARISC)
446         default 1280 if KASAN && !64BIT        << 
447         default 1024 if !64BIT                 << 
448         default 2048 if 64BIT                     276         default 2048 if 64BIT
449         help                                      277         help
450           Tell the compiler to warn at build t !! 278           Tell gcc to warn at build time for stack frames larger than this.
451           Setting this too low will cause a lo    279           Setting this too low will cause a lot of warnings.
452           Setting it to 0 disables the warning    280           Setting it to 0 disables the warning.
                                                   >> 281           Requires gcc 4.4
453                                                   282 
454 config STRIP_ASM_SYMS                             283 config STRIP_ASM_SYMS
455         bool "Strip assembler-generated symbol    284         bool "Strip assembler-generated symbols during link"
456         default n                                 285         default n
457         help                                      286         help
458           Strip internal assembler-generated s    287           Strip internal assembler-generated symbols during a link (symbols
459           that look like '.Lxxx') so they don'    288           that look like '.Lxxx') so they don't pollute the output of
460           get_wchan() and suchlike.               289           get_wchan() and suchlike.
461                                                   290 
462 config READABLE_ASM                               291 config READABLE_ASM
463         bool "Generate readable assembler code    292         bool "Generate readable assembler code"
464         depends on DEBUG_KERNEL                   293         depends on DEBUG_KERNEL
465         depends on CC_IS_GCC                   << 
466         help                                      294         help
467           Disable some compiler optimizations     295           Disable some compiler optimizations that tend to generate human unreadable
468           assembler output. This may make the     296           assembler output. This may make the kernel slightly slower, but it helps
469           to keep kernel developers who have t    297           to keep kernel developers who have to stare a lot at assembler listings
470           sane.                                   298           sane.
471                                                   299 
472 config HEADERS_INSTALL                            300 config HEADERS_INSTALL
473         bool "Install uapi headers to usr/incl    301         bool "Install uapi headers to usr/include"
474         depends on !UML                           302         depends on !UML
475         help                                      303         help
476           This option will install uapi header    304           This option will install uapi headers (headers exported to user-space)
477           into the usr/include directory for u    305           into the usr/include directory for use during the kernel build.
478           This is unneeded for building the ke    306           This is unneeded for building the kernel itself, but needed for some
479           user-space program samples. It is al    307           user-space program samples. It is also needed by some features such
480           as uapi header sanity checks.           308           as uapi header sanity checks.
481                                                   309 
                                                   >> 310 config OPTIMIZE_INLINING
                                                   >> 311         def_bool y
                                                   >> 312         help
                                                   >> 313           This option determines if the kernel forces gcc to inline the functions
                                                   >> 314           developers have marked 'inline'. Doing so takes away freedom from gcc to
                                                   >> 315           do what it thinks is best, which is desirable for the gcc 3.x series of
                                                   >> 316           compilers. The gcc 4.x series have a rewritten inlining algorithm and
                                                   >> 317           enabling this option will generate a smaller kernel there. Hopefully
                                                   >> 318           this algorithm is so good that allowing gcc 4.x and above to make the
                                                   >> 319           decision will become the default in the future. Until then this option
                                                   >> 320           is there to test gcc for this.
                                                   >> 321 
482 config DEBUG_SECTION_MISMATCH                     322 config DEBUG_SECTION_MISMATCH
483         bool "Enable full Section mismatch ana    323         bool "Enable full Section mismatch analysis"
484         depends on CC_IS_GCC                   << 
485         help                                      324         help
486           The section mismatch analysis checks    325           The section mismatch analysis checks if there are illegal
487           references from one section to anoth    326           references from one section to another section.
488           During linktime or runtime, some sec    327           During linktime or runtime, some sections are dropped;
489           any use of code/data previously in t    328           any use of code/data previously in these sections would
490           most likely result in an oops.          329           most likely result in an oops.
491           In the code, functions and variables    330           In the code, functions and variables are annotated with
492           __init,, etc. (see the full list in     331           __init,, etc. (see the full list in include/linux/init.h),
493           which results in the code/data being    332           which results in the code/data being placed in specific sections.
494           The section mismatch analysis is alw    333           The section mismatch analysis is always performed after a full
495           kernel build, and enabling this opti    334           kernel build, and enabling this option causes the following
496           additional step to occur:               335           additional step to occur:
497           - Add the option -fno-inline-functio    336           - Add the option -fno-inline-functions-called-once to gcc commands.
498             When inlining a function annotated    337             When inlining a function annotated with __init in a non-init
499             function, we would lose the sectio    338             function, we would lose the section information and thus
500             the analysis would not catch the i    339             the analysis would not catch the illegal reference.
501             This option tells gcc to inline le    340             This option tells gcc to inline less (but it does result in
502             a larger kernel).                     341             a larger kernel).
503                                                   342 
504 config SECTION_MISMATCH_WARN_ONLY                 343 config SECTION_MISMATCH_WARN_ONLY
505         bool "Make section mismatch errors non    344         bool "Make section mismatch errors non-fatal"
506         default y                                 345         default y
507         help                                      346         help
508           If you say N here, the build process    347           If you say N here, the build process will fail if there are any
509           section mismatch, instead of just th    348           section mismatch, instead of just throwing warnings.
510                                                   349 
511           If unsure, say Y.                       350           If unsure, say Y.
512                                                   351 
513 config DEBUG_FORCE_FUNCTION_ALIGN_64B          << 
514         bool "Force all function address 64B a << 
515         depends on EXPERT && (X86_64 || ARM64  << 
516         select FUNCTION_ALIGNMENT_64B          << 
517         help                                   << 
518           There are cases that a commit from o << 
519           address alignment of other domains,  << 
520           bump (regression or improvement). En << 
521           verify if the bump is caused by func << 
522           it will slightly increase the kernel << 
523                                                << 
524           It is mainly for debug and performan << 
525                                                << 
526 #                                                 352 #
527 # Select this config option from the architect    353 # Select this config option from the architecture Kconfig, if it
528 # is preferred to always offer frame pointers     354 # is preferred to always offer frame pointers as a config
529 # option on the architecture (regardless of KE    355 # option on the architecture (regardless of KERNEL_DEBUG):
530 #                                                 356 #
531 config ARCH_WANT_FRAME_POINTERS                   357 config ARCH_WANT_FRAME_POINTERS
532         bool                                      358         bool
533                                                   359 
534 config FRAME_POINTER                              360 config FRAME_POINTER
535         bool "Compile the kernel with frame po    361         bool "Compile the kernel with frame pointers"
536         depends on DEBUG_KERNEL && (M68K || UM    362         depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS
537         default y if (DEBUG_INFO && UML) || AR    363         default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
538         help                                      364         help
539           If you say Y here the resulting kern    365           If you say Y here the resulting kernel image will be slightly
540           larger and slower, but it gives very    366           larger and slower, but it gives very useful debugging information
541           in case of kernel bugs. (precise oop    367           in case of kernel bugs. (precise oopses/stacktraces/warnings)
542                                                   368 
543 config OBJTOOL                                 << 
544         bool                                   << 
545                                                << 
546 config STACK_VALIDATION                           369 config STACK_VALIDATION
547         bool "Compile-time stack metadata vali    370         bool "Compile-time stack metadata validation"
548         depends on HAVE_STACK_VALIDATION && UN !! 371         depends on HAVE_STACK_VALIDATION
549         select OBJTOOL                         << 
550         default n                                 372         default n
551         help                                      373         help
552           Validate frame pointer rules at comp !! 374           Add compile-time checks to validate stack metadata, including frame
553           runtime stack traces are more reliab !! 375           pointers (if CONFIG_FRAME_POINTER is enabled).  This helps ensure
                                                   >> 376           that runtime stack traces are more reliable.
554                                                   377 
555           For more information, see            !! 378           This is also a prerequisite for generation of ORC unwind data, which
556           tools/objtool/Documentation/objtool. !! 379           is needed for CONFIG_UNWINDER_ORC.
557                                                << 
558 config NOINSTR_VALIDATION                      << 
559         bool                                   << 
560         depends on HAVE_NOINSTR_VALIDATION &&  << 
561         select OBJTOOL                         << 
562         default y                              << 
563                                                   380 
564 config VMLINUX_MAP                             !! 381           For more information, see
565         bool "Generate vmlinux.map file when l !! 382           tools/objtool/Documentation/stack-validation.txt.
566         depends on EXPERT                      << 
567         help                                   << 
568           Selecting this option will pass "-Ma << 
569           when linking vmlinux. That file can  << 
570           and debugging magic section games, a << 
571           pieces of code get eliminated with   << 
572           CONFIG_LD_DEAD_CODE_DATA_ELIMINATION << 
573                                                   383 
574 config DEBUG_FORCE_WEAK_PER_CPU                   384 config DEBUG_FORCE_WEAK_PER_CPU
575         bool "Force weak per-cpu definitions"     385         bool "Force weak per-cpu definitions"
576         depends on DEBUG_KERNEL                   386         depends on DEBUG_KERNEL
577         help                                      387         help
578           s390 and alpha require percpu variab    388           s390 and alpha require percpu variables in modules to be
579           defined weak to work around addressi    389           defined weak to work around addressing range issue which
580           puts the following two restrictions     390           puts the following two restrictions on percpu variable
581           definitions.                            391           definitions.
582                                                   392 
583           1. percpu symbols must be unique whe    393           1. percpu symbols must be unique whether static or not
584           2. percpu variables can't be defined    394           2. percpu variables can't be defined inside a function
585                                                   395 
586           To ensure that generic code follows     396           To ensure that generic code follows the above rules, this
587           option forces all percpu variables t    397           option forces all percpu variables to be defined as weak.
588                                                   398 
589 endmenu # "Compiler options"                      399 endmenu # "Compiler options"
590                                                   400 
591 menu "Generic Kernel Debugging Instruments"       401 menu "Generic Kernel Debugging Instruments"
592                                                   402 
593 config MAGIC_SYSRQ                                403 config MAGIC_SYSRQ
594         bool "Magic SysRq key"                    404         bool "Magic SysRq key"
595         depends on !UML                           405         depends on !UML
596         help                                      406         help
597           If you say Y here, you will have som    407           If you say Y here, you will have some control over the system even
598           if the system crashes for example du    408           if the system crashes for example during kernel debugging (e.g., you
599           will be able to flush the buffer cac    409           will be able to flush the buffer cache to disk, reboot the system
600           immediately or dump some status info    410           immediately or dump some status information). This is accomplished
601           by pressing various keys while holdi    411           by pressing various keys while holding SysRq (Alt+PrintScreen). It
602           also works on a serial console (on P    412           also works on a serial console (on PC hardware at least), if you
603           send a BREAK and then within 5 secon    413           send a BREAK and then within 5 seconds a command keypress. The
604           keys are documented in <file:Documen    414           keys are documented in <file:Documentation/admin-guide/sysrq.rst>.
605           Don't say Y unless you really know w    415           Don't say Y unless you really know what this hack does.
606                                                   416 
607 config MAGIC_SYSRQ_DEFAULT_ENABLE                 417 config MAGIC_SYSRQ_DEFAULT_ENABLE
608         hex "Enable magic SysRq key functions     418         hex "Enable magic SysRq key functions by default"
609         depends on MAGIC_SYSRQ                    419         depends on MAGIC_SYSRQ
610         default 0x1                               420         default 0x1
611         help                                      421         help
612           Specifies which SysRq key functions     422           Specifies which SysRq key functions are enabled by default.
613           This may be set to 1 or 0 to enable     423           This may be set to 1 or 0 to enable or disable them all, or
614           to a bitmask as described in Documen    424           to a bitmask as described in Documentation/admin-guide/sysrq.rst.
615                                                   425 
616 config MAGIC_SYSRQ_SERIAL                         426 config MAGIC_SYSRQ_SERIAL
617         bool "Enable magic SysRq key over seri    427         bool "Enable magic SysRq key over serial"
618         depends on MAGIC_SYSRQ                    428         depends on MAGIC_SYSRQ
619         default y                                 429         default y
620         help                                      430         help
621           Many embedded boards have a disconne    431           Many embedded boards have a disconnected TTL level serial which can
622           generate some garbage that can lead     432           generate some garbage that can lead to spurious false sysrq detects.
623           This option allows you to decide whe    433           This option allows you to decide whether you want to enable the
624           magic SysRq key.                        434           magic SysRq key.
625                                                   435 
626 config MAGIC_SYSRQ_SERIAL_SEQUENCE             << 
627         string "Char sequence that enables mag << 
628         depends on MAGIC_SYSRQ_SERIAL          << 
629         default ""                             << 
630         help                                   << 
631           Specifies a sequence of characters t << 
632           SysRq on a serial console.           << 
633                                                << 
634           If unsure, leave an empty string and << 
635                                                << 
636 config DEBUG_FS                                   436 config DEBUG_FS
637         bool "Debug Filesystem"                   437         bool "Debug Filesystem"
638         help                                      438         help
639           debugfs is a virtual file system tha    439           debugfs is a virtual file system that kernel developers use to put
640           debugging files into.  Enable this o    440           debugging files into.  Enable this option to be able to read and
641           write to these files.                   441           write to these files.
642                                                   442 
643           For detailed documentation on the de    443           For detailed documentation on the debugfs API, see
644           Documentation/filesystems/.             444           Documentation/filesystems/.
645                                                   445 
646           If unsure, say N.                       446           If unsure, say N.
647                                                   447 
648 choice                                         << 
649         prompt "Debugfs default access"        << 
650         depends on DEBUG_FS                    << 
651         default DEBUG_FS_ALLOW_ALL             << 
652         help                                   << 
653           This selects the default access rest << 
654           It can be overridden with kernel com << 
655           debugfs=[on,no-mount,off]. The restr << 
656           and filesystem registration.         << 
657                                                << 
658 config DEBUG_FS_ALLOW_ALL                      << 
659         bool "Access normal"                   << 
660         help                                   << 
661           No restrictions apply. Both API and  << 
662           is on. This is the normal default op << 
663                                                << 
664 config DEBUG_FS_DISALLOW_MOUNT                 << 
665         bool "Do not register debugfs as files << 
666         help                                   << 
667           The API is open but filesystem is no << 
668           their work and read with debug tools << 
669           debugfs filesystem.                  << 
670                                                << 
671 config DEBUG_FS_ALLOW_NONE                     << 
672         bool "No access"                       << 
673         help                                   << 
674           Access is off. Clients get -PERM whe << 
675           debugfs tree and debugfs is not regi << 
676           Client can then back-off or continue << 
677                                                << 
678 endchoice                                      << 
679                                                << 
680 source "lib/Kconfig.kgdb"                         448 source "lib/Kconfig.kgdb"
                                                   >> 449 
681 source "lib/Kconfig.ubsan"                        450 source "lib/Kconfig.ubsan"
682 source "lib/Kconfig.kcsan"                     << 
683                                                   451 
684 endmenu                                           452 endmenu
685                                                   453 
686 menu "Networking Debugging"                    !! 454 config DEBUG_KERNEL
                                                   >> 455         bool "Kernel debugging"
                                                   >> 456         help
                                                   >> 457           Say Y here if you are developing drivers or trying to debug and
                                                   >> 458           identify kernel problems.
687                                                   459 
688 source "net/Kconfig.debug"                     !! 460 config DEBUG_MISC
                                                   >> 461         bool "Miscellaneous debug code"
                                                   >> 462         default DEBUG_KERNEL
                                                   >> 463         depends on DEBUG_KERNEL
                                                   >> 464         help
                                                   >> 465           Say Y here if you need to enable miscellaneous debug code that should
                                                   >> 466           be under a more specific debug option but isn't.
689                                                   467 
690 endmenu # "Networking Debugging"               << 
691                                                   468 
692 menu "Memory Debugging"                           469 menu "Memory Debugging"
693                                                   470 
694 source "mm/Kconfig.debug"                         471 source "mm/Kconfig.debug"
695                                                   472 
696 config DEBUG_OBJECTS                              473 config DEBUG_OBJECTS
697         bool "Debug object operations"            474         bool "Debug object operations"
698         depends on DEBUG_KERNEL                   475         depends on DEBUG_KERNEL
699         help                                      476         help
700           If you say Y here, additional code w    477           If you say Y here, additional code will be inserted into the
701           kernel to track the life time of var    478           kernel to track the life time of various objects and validate
702           the operations on those objects.        479           the operations on those objects.
703                                                   480 
704 config DEBUG_OBJECTS_SELFTEST                     481 config DEBUG_OBJECTS_SELFTEST
705         bool "Debug objects selftest"             482         bool "Debug objects selftest"
706         depends on DEBUG_OBJECTS                  483         depends on DEBUG_OBJECTS
707         help                                      484         help
708           This enables the selftest of the obj    485           This enables the selftest of the object debug code.
709                                                   486 
710 config DEBUG_OBJECTS_FREE                         487 config DEBUG_OBJECTS_FREE
711         bool "Debug objects in freed memory"      488         bool "Debug objects in freed memory"
712         depends on DEBUG_OBJECTS                  489         depends on DEBUG_OBJECTS
713         help                                      490         help
714           This enables checks whether a k/v fr    491           This enables checks whether a k/v free operation frees an area
715           which contains an object which has n    492           which contains an object which has not been deactivated
716           properly. This can make kmalloc/kfre    493           properly. This can make kmalloc/kfree-intensive workloads
717           much slower.                            494           much slower.
718                                                   495 
719 config DEBUG_OBJECTS_TIMERS                       496 config DEBUG_OBJECTS_TIMERS
720         bool "Debug timer objects"                497         bool "Debug timer objects"
721         depends on DEBUG_OBJECTS                  498         depends on DEBUG_OBJECTS
722         help                                      499         help
723           If you say Y here, additional code w    500           If you say Y here, additional code will be inserted into the
724           timer routines to track the life tim    501           timer routines to track the life time of timer objects and
725           validate the timer operations.          502           validate the timer operations.
726                                                   503 
727 config DEBUG_OBJECTS_WORK                         504 config DEBUG_OBJECTS_WORK
728         bool "Debug work objects"                 505         bool "Debug work objects"
729         depends on DEBUG_OBJECTS                  506         depends on DEBUG_OBJECTS
730         help                                      507         help
731           If you say Y here, additional code w    508           If you say Y here, additional code will be inserted into the
732           work queue routines to track the lif    509           work queue routines to track the life time of work objects and
733           validate the work operations.           510           validate the work operations.
734                                                   511 
735 config DEBUG_OBJECTS_RCU_HEAD                     512 config DEBUG_OBJECTS_RCU_HEAD
736         bool "Debug RCU callbacks objects"        513         bool "Debug RCU callbacks objects"
737         depends on DEBUG_OBJECTS                  514         depends on DEBUG_OBJECTS
738         help                                      515         help
739           Enable this to turn on debugging of     516           Enable this to turn on debugging of RCU list heads (call_rcu() usage).
740                                                   517 
741 config DEBUG_OBJECTS_PERCPU_COUNTER               518 config DEBUG_OBJECTS_PERCPU_COUNTER
742         bool "Debug percpu counter objects"       519         bool "Debug percpu counter objects"
743         depends on DEBUG_OBJECTS                  520         depends on DEBUG_OBJECTS
744         help                                      521         help
745           If you say Y here, additional code w    522           If you say Y here, additional code will be inserted into the
746           percpu counter routines to track the    523           percpu counter routines to track the life time of percpu counter
747           objects and validate the percpu coun    524           objects and validate the percpu counter operations.
748                                                   525 
749 config DEBUG_OBJECTS_ENABLE_DEFAULT               526 config DEBUG_OBJECTS_ENABLE_DEFAULT
750         int "debug_objects bootup default valu    527         int "debug_objects bootup default value (0-1)"
751         range 0 1                                 528         range 0 1
752         default "1"                               529         default "1"
753         depends on DEBUG_OBJECTS                  530         depends on DEBUG_OBJECTS
754         help                                      531         help
755           Debug objects boot parameter default    532           Debug objects boot parameter default value
756                                                   533 
757 config SHRINKER_DEBUG                          !! 534 config DEBUG_SLAB
758         bool "Enable shrinker debugging suppor !! 535         bool "Debug slab memory allocations"
759         depends on DEBUG_FS                    !! 536         depends on DEBUG_KERNEL && SLAB
                                                   >> 537         help
                                                   >> 538           Say Y here to have the kernel do limited verification on memory
                                                   >> 539           allocation as well as poisoning memory on free to catch use of freed
                                                   >> 540           memory. This can make kmalloc/kfree-intensive workloads much slower.
                                                   >> 541 
                                                   >> 542 config SLUB_DEBUG_ON
                                                   >> 543         bool "SLUB debugging on by default"
                                                   >> 544         depends on SLUB && SLUB_DEBUG
                                                   >> 545         default n
                                                   >> 546         help
                                                   >> 547           Boot with debugging on by default. SLUB boots by default with
                                                   >> 548           the runtime debug capabilities switched off. Enabling this is
                                                   >> 549           equivalent to specifying the "slub_debug" parameter on boot.
                                                   >> 550           There is no support for more fine grained debug control like
                                                   >> 551           possible with slub_debug=xxx. SLUB debugging may be switched
                                                   >> 552           off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
                                                   >> 553           "slub_debug=-".
                                                   >> 554 
                                                   >> 555 config SLUB_STATS
                                                   >> 556         default n
                                                   >> 557         bool "Enable SLUB performance statistics"
                                                   >> 558         depends on SLUB && SYSFS
                                                   >> 559         help
                                                   >> 560           SLUB statistics are useful to debug SLUBs allocation behavior in
                                                   >> 561           order find ways to optimize the allocator. This should never be
                                                   >> 562           enabled for production use since keeping statistics slows down
                                                   >> 563           the allocator by a few percentage points. The slabinfo command
                                                   >> 564           supports the determination of the most active slabs to figure
                                                   >> 565           out which slabs are relevant to a particular load.
                                                   >> 566           Try running: slabinfo -DA
                                                   >> 567 
                                                   >> 568 config HAVE_DEBUG_KMEMLEAK
                                                   >> 569         bool
                                                   >> 570 
                                                   >> 571 config DEBUG_KMEMLEAK
                                                   >> 572         bool "Kernel memory leak detector"
                                                   >> 573         depends on DEBUG_KERNEL && HAVE_DEBUG_KMEMLEAK
                                                   >> 574         select DEBUG_FS
                                                   >> 575         select STACKTRACE if STACKTRACE_SUPPORT
                                                   >> 576         select KALLSYMS
                                                   >> 577         select CRC32
760         help                                      578         help
761           Say Y to enable the shrinker debugfs !! 579           Say Y here if you want to enable the memory leak
762           visibility into the kernel memory sh !! 580           detector. The memory allocation/freeing is traced in a way
763           Disable it to avoid an extra memory  !! 581           similar to the Boehm's conservative garbage collector, the
                                                   >> 582           difference being that the orphan objects are not freed but
                                                   >> 583           only shown in /sys/kernel/debug/kmemleak. Enabling this
                                                   >> 584           feature will introduce an overhead to memory
                                                   >> 585           allocations. See Documentation/dev-tools/kmemleak.rst for more
                                                   >> 586           details.
                                                   >> 587 
                                                   >> 588           Enabling DEBUG_SLAB or SLUB_DEBUG may increase the chances
                                                   >> 589           of finding leaks due to the slab objects poisoning.
                                                   >> 590 
                                                   >> 591           In order to access the kmemleak file, debugfs needs to be
                                                   >> 592           mounted (usually at /sys/kernel/debug).
                                                   >> 593 
                                                   >> 594 config DEBUG_KMEMLEAK_MEM_POOL_SIZE
                                                   >> 595         int "Kmemleak memory pool size"
                                                   >> 596         depends on DEBUG_KMEMLEAK
                                                   >> 597         range 200 1000000
                                                   >> 598         default 16000
                                                   >> 599         help
                                                   >> 600           Kmemleak must track all the memory allocations to avoid
                                                   >> 601           reporting false positives. Since memory may be allocated or
                                                   >> 602           freed before kmemleak is fully initialised, use a static pool
                                                   >> 603           of metadata objects to track such callbacks. After kmemleak is
                                                   >> 604           fully initialised, this memory pool acts as an emergency one
                                                   >> 605           if slab allocations fail.
                                                   >> 606 
                                                   >> 607 config DEBUG_KMEMLEAK_TEST
                                                   >> 608         tristate "Simple test for the kernel memory leak detector"
                                                   >> 609         depends on DEBUG_KMEMLEAK && m
                                                   >> 610         help
                                                   >> 611           This option enables a module that explicitly leaks memory.
                                                   >> 612 
                                                   >> 613           If unsure, say N.
                                                   >> 614 
                                                   >> 615 config DEBUG_KMEMLEAK_DEFAULT_OFF
                                                   >> 616         bool "Default kmemleak to off"
                                                   >> 617         depends on DEBUG_KMEMLEAK
                                                   >> 618         help
                                                   >> 619           Say Y here to disable kmemleak by default. It can then be enabled
                                                   >> 620           on the command line via kmemleak=on.
                                                   >> 621 
                                                   >> 622 config DEBUG_KMEMLEAK_AUTO_SCAN
                                                   >> 623         bool "Enable kmemleak auto scan thread on boot up"
                                                   >> 624         default y
                                                   >> 625         depends on DEBUG_KMEMLEAK
                                                   >> 626         help
                                                   >> 627           Depending on the cpu, kmemleak scan may be cpu intensive and can
                                                   >> 628           stall user tasks at times. This option enables/disables automatic
                                                   >> 629           kmemleak scan at boot up.
                                                   >> 630 
                                                   >> 631           Say N here to disable kmemleak auto scan thread to stop automatic
                                                   >> 632           scanning. Disabling this option disables automatic reporting of
                                                   >> 633           memory leaks.
                                                   >> 634 
                                                   >> 635           If unsure, say Y.
764                                                   636 
765 config DEBUG_STACK_USAGE                          637 config DEBUG_STACK_USAGE
766         bool "Stack utilization instrumentatio    638         bool "Stack utilization instrumentation"
767         depends on DEBUG_KERNEL                !! 639         depends on DEBUG_KERNEL && !IA64
768         help                                      640         help
769           Enables the display of the minimum a    641           Enables the display of the minimum amount of free stack which each
770           task has ever had available in the s    642           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                                                   643 
774           This option will slow down process c    644           This option will slow down process creation somewhat.
775                                                   645 
776 config SCHED_STACK_END_CHECK                      646 config SCHED_STACK_END_CHECK
777         bool "Detect stack corruption on calls    647         bool "Detect stack corruption on calls to schedule()"
778         depends on DEBUG_KERNEL                   648         depends on DEBUG_KERNEL
779         default n                                 649         default n
780         help                                      650         help
781           This option checks for a stack overr    651           This option checks for a stack overrun on calls to schedule().
782           If the stack end location is found t    652           If the stack end location is found to be over written always panic as
783           the content of the corrupted region     653           the content of the corrupted region can no longer be trusted.
784           This is to ensure no erroneous behav    654           This is to ensure no erroneous behaviour occurs which could result in
785           data corruption or a sporadic crash     655           data corruption or a sporadic crash at a later stage once the region
786           is examined. The runtime overhead in    656           is examined. The runtime overhead introduced is minimal.
787                                                   657 
788 config ARCH_HAS_DEBUG_VM_PGTABLE               << 
789         bool                                   << 
790         help                                   << 
791           An architecture should select this w << 
792           build and run DEBUG_VM_PGTABLE.      << 
793                                                << 
794 config DEBUG_VM_IRQSOFF                        << 
795         def_bool DEBUG_VM && !PREEMPT_RT       << 
796                                                << 
797 config DEBUG_VM                                   658 config DEBUG_VM
798         bool "Debug VM"                           659         bool "Debug VM"
799         depends on DEBUG_KERNEL                   660         depends on DEBUG_KERNEL
800         help                                      661         help
801           Enable this to turn on extended chec    662           Enable this to turn on extended checks in the virtual-memory system
802           that may impact performance.            663           that may impact performance.
803                                                   664 
804           If unsure, say N.                       665           If unsure, say N.
805                                                   666 
806 config DEBUG_VM_SHOOT_LAZIES                   !! 667 config DEBUG_VM_VMACACHE
807         bool "Debug MMU_LAZY_TLB_SHOOTDOWN imp !! 668         bool "Debug VMA caching"
808         depends on DEBUG_VM                    << 
809         depends on MMU_LAZY_TLB_SHOOTDOWN      << 
810         help                                   << 
811           Enable additional IPIs that ensure l << 
812           before the mm is freed.              << 
813                                                << 
814           If unsure, say N.                    << 
815                                                << 
816 config DEBUG_VM_MAPLE_TREE                     << 
817         bool "Debug VM maple trees"            << 
818         depends on DEBUG_VM                       669         depends on DEBUG_VM
819         select DEBUG_MAPLE_TREE                << 
820         help                                      670         help
821           Enable VM maple tree debugging infor !! 671           Enable this to turn on VMA caching debug information. Doing so
                                                   >> 672           can cause significant overhead, so only enable it in non-production
                                                   >> 673           environments.
822                                                   674 
823           If unsure, say N.                       675           If unsure, say N.
824                                                   676 
825 config DEBUG_VM_RB                                677 config DEBUG_VM_RB
826         bool "Debug VM red-black trees"           678         bool "Debug VM red-black trees"
827         depends on DEBUG_VM                       679         depends on DEBUG_VM
828         help                                      680         help
829           Enable VM red-black tree debugging i    681           Enable VM red-black tree debugging information and extra validations.
830                                                   682 
831           If unsure, say N.                       683           If unsure, say N.
832                                                   684 
833 config DEBUG_VM_PGFLAGS                           685 config DEBUG_VM_PGFLAGS
834         bool "Debug page-flags operations"        686         bool "Debug page-flags operations"
835         depends on DEBUG_VM                       687         depends on DEBUG_VM
836         help                                      688         help
837           Enables extra validation on page fla    689           Enables extra validation on page flags operations.
838                                                   690 
839           If unsure, say N.                       691           If unsure, say N.
840                                                   692 
841 config DEBUG_VM_PGTABLE                        << 
842         bool "Debug arch page table for semant << 
843         depends on MMU                         << 
844         depends on ARCH_HAS_DEBUG_VM_PGTABLE   << 
845         default y if DEBUG_VM                  << 
846         help                                   << 
847           This option provides a debug method  << 
848           architecture page table helper funct << 
849           verifying if they comply with expect << 
850           will help architecture code in makin << 
851           new additions of these helpers still << 
852           semantics of the generic MM. Platfor << 
853           this through ARCH_HAS_DEBUG_VM_PGTAB << 
854                                                << 
855           If unsure, say N.                    << 
856                                                << 
857 config ARCH_HAS_DEBUG_VIRTUAL                     693 config ARCH_HAS_DEBUG_VIRTUAL
858         bool                                      694         bool
859                                                   695 
860 config DEBUG_VIRTUAL                              696 config DEBUG_VIRTUAL
861         bool "Debug VM translations"              697         bool "Debug VM translations"
862         depends on DEBUG_KERNEL && ARCH_HAS_DE    698         depends on DEBUG_KERNEL && ARCH_HAS_DEBUG_VIRTUAL
863         help                                      699         help
864           Enable some costly sanity checks in     700           Enable some costly sanity checks in virtual to page code. This can
865           catch mistakes with virt_to_page() a    701           catch mistakes with virt_to_page() and friends.
866                                                   702 
867           If unsure, say N.                       703           If unsure, say N.
868                                                   704 
869 config DEBUG_NOMMU_REGIONS                        705 config DEBUG_NOMMU_REGIONS
870         bool "Debug the global anon/private NO    706         bool "Debug the global anon/private NOMMU mapping region tree"
871         depends on DEBUG_KERNEL && !MMU           707         depends on DEBUG_KERNEL && !MMU
872         help                                      708         help
873           This option causes the global tree o    709           This option causes the global tree of anonymous and private mapping
874           regions to be regularly checked for     710           regions to be regularly checked for invalid topology.
875                                                   711 
876 config DEBUG_MEMORY_INIT                          712 config DEBUG_MEMORY_INIT
877         bool "Debug memory initialisation" if     713         bool "Debug memory initialisation" if EXPERT
878         default !EXPERT                           714         default !EXPERT
879         help                                      715         help
880           Enable this for additional checks du    716           Enable this for additional checks during memory initialisation.
881           The sanity checks verify aspects of     717           The sanity checks verify aspects of the VM such as the memory model
882           and other information provided by th    718           and other information provided by the architecture. Verbose
883           information will be printed at KERN_    719           information will be printed at KERN_DEBUG loglevel depending
884           on the mminit_loglevel= command-line    720           on the mminit_loglevel= command-line option.
885                                                   721 
886           If unsure, say Y                        722           If unsure, say Y
887                                                   723 
888 config MEMORY_NOTIFIER_ERROR_INJECT               724 config MEMORY_NOTIFIER_ERROR_INJECT
889         tristate "Memory hotplug notifier erro    725         tristate "Memory hotplug notifier error injection module"
890         depends on MEMORY_HOTPLUG && NOTIFIER_ !! 726         depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
891         help                                      727         help
892           This option provides the ability to     728           This option provides the ability to inject artificial errors to
893           memory hotplug notifier chain callba    729           memory hotplug notifier chain callbacks.  It is controlled through
894           debugfs interface under /sys/kernel/    730           debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
895                                                   731 
896           If the notifier call chain should be    732           If the notifier call chain should be failed with some events
897           notified, write the error code to "a    733           notified, write the error code to "actions/<notifier event>/error".
898                                                   734 
899           Example: Inject memory hotplug offli    735           Example: Inject memory hotplug offline error (-12 == -ENOMEM)
900                                                   736 
901           # cd /sys/kernel/debug/notifier-erro    737           # cd /sys/kernel/debug/notifier-error-inject/memory
902           # echo -12 > actions/MEM_GOING_OFFLI    738           # echo -12 > actions/MEM_GOING_OFFLINE/error
903           # echo offline > /sys/devices/system    739           # echo offline > /sys/devices/system/memory/memoryXXX/state
904           bash: echo: write error: Cannot allo    740           bash: echo: write error: Cannot allocate memory
905                                                   741 
906           To compile this code as a module, ch    742           To compile this code as a module, choose M here: the module will
907           be called memory-notifier-error-inje    743           be called memory-notifier-error-inject.
908                                                   744 
909           If unsure, say N.                       745           If unsure, say N.
910                                                   746 
911 config DEBUG_PER_CPU_MAPS                         747 config DEBUG_PER_CPU_MAPS
912         bool "Debug access to per_cpu maps"       748         bool "Debug access to per_cpu maps"
913         depends on DEBUG_KERNEL                   749         depends on DEBUG_KERNEL
914         depends on SMP                            750         depends on SMP
915         help                                      751         help
916           Say Y to verify that the per_cpu map    752           Say Y to verify that the per_cpu map being accessed has
917           been set up. This adds a fair amount    753           been set up. This adds a fair amount of code to kernel memory
918           and decreases performance.              754           and decreases performance.
919                                                   755 
920           Say N if unsure.                        756           Say N if unsure.
921                                                   757 
922 config DEBUG_KMAP_LOCAL                        << 
923         bool "Debug kmap_local temporary mappi << 
924         depends on DEBUG_KERNEL && KMAP_LOCAL  << 
925         help                                   << 
926           This option enables additional error << 
927           infrastructure.  Disable for product << 
928                                                << 
929 config ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP      << 
930         bool                                   << 
931                                                << 
932 config DEBUG_KMAP_LOCAL_FORCE_MAP              << 
933         bool "Enforce kmap_local temporary map << 
934         depends on DEBUG_KERNEL && ARCH_SUPPOR << 
935         select KMAP_LOCAL                      << 
936         select DEBUG_KMAP_LOCAL                << 
937         help                                   << 
938           This option enforces temporary mappi << 
939           mechanism for non-highmem pages and  << 
940           Disable this for production systems! << 
941                                                << 
942 config DEBUG_HIGHMEM                              758 config DEBUG_HIGHMEM
943         bool "Highmem debugging"                  759         bool "Highmem debugging"
944         depends on DEBUG_KERNEL && HIGHMEM        760         depends on DEBUG_KERNEL && HIGHMEM
945         select DEBUG_KMAP_LOCAL_FORCE_MAP if A << 
946         select DEBUG_KMAP_LOCAL                << 
947         help                                      761         help
948           This option enables additional error    762           This option enables additional error checking for high memory
949           systems.  Disable for production sys    763           systems.  Disable for production systems.
950                                                   764 
951 config HAVE_DEBUG_STACKOVERFLOW                   765 config HAVE_DEBUG_STACKOVERFLOW
952         bool                                      766         bool
953                                                   767 
954 config DEBUG_STACKOVERFLOW                        768 config DEBUG_STACKOVERFLOW
955         bool "Check for stack overflows"          769         bool "Check for stack overflows"
956         depends on DEBUG_KERNEL && HAVE_DEBUG_    770         depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
957         help                                   !! 771         ---help---
958           Say Y here if you want to check for     772           Say Y here if you want to check for overflows of kernel, IRQ
959           and exception stacks (if your archit    773           and exception stacks (if your architecture uses them). This
960           option will show detailed messages i    774           option will show detailed messages if free stack space drops
961           below a certain limit.                  775           below a certain limit.
962                                                   776 
963           These kinds of bugs usually occur wh    777           These kinds of bugs usually occur when call-chains in the
964           kernel get too deep, especially when    778           kernel get too deep, especially when interrupts are
965           involved.                               779           involved.
966                                                   780 
967           Use this in cases where you see appa    781           Use this in cases where you see apparently random memory
968           corruption, especially if it appears    782           corruption, especially if it appears in 'struct thread_info'
969                                                   783 
970           If in doubt, say "N".                   784           If in doubt, say "N".
971                                                   785 
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"                       786 source "lib/Kconfig.kasan"
1004 source "lib/Kconfig.kfence"                   << 
1005 source "lib/Kconfig.kmsan"                    << 
1006                                                  787 
1007 endmenu # "Memory Debugging"                     788 endmenu # "Memory Debugging"
1008                                                  789 
1009 config DEBUG_SHIRQ                               790 config DEBUG_SHIRQ
1010         bool "Debug shared IRQ handlers"         791         bool "Debug shared IRQ handlers"
1011         depends on DEBUG_KERNEL                  792         depends on DEBUG_KERNEL
1012         help                                     793         help
1013           Enable this to generate a spurious  !! 794           Enable this to generate a spurious interrupt as soon as a shared
1014           interrupt handler is deregistered ( !! 795           interrupt handler is registered, and just before one is deregistered.
1015           is currently disabled). Drivers nee !! 796           Drivers ought to be able to handle interrupts coming in at those
1016           don't and need to be caught.        !! 797           points; some don't and need to be caught.
1017                                                  798 
1018 menu "Debug Oops, Lockups and Hangs"             799 menu "Debug Oops, Lockups and Hangs"
1019                                                  800 
1020 config PANIC_ON_OOPS                             801 config PANIC_ON_OOPS
1021         bool "Panic on Oops"                     802         bool "Panic on Oops"
1022         help                                     803         help
1023           Say Y here to enable the kernel to     804           Say Y here to enable the kernel to panic when it oopses. This
1024           has the same effect as setting oops    805           has the same effect as setting oops=panic on the kernel command
1025           line.                                  806           line.
1026                                                  807 
1027           This feature is useful to ensure th    808           This feature is useful to ensure that the kernel does not do
1028           anything erroneous after an oops wh    809           anything erroneous after an oops which could result in data
1029           corruption or other issues.            810           corruption or other issues.
1030                                                  811 
1031           Say N if unsure.                       812           Say N if unsure.
1032                                                  813 
1033 config PANIC_ON_OOPS_VALUE                       814 config PANIC_ON_OOPS_VALUE
1034         int                                      815         int
1035         range 0 1                                816         range 0 1
1036         default 0 if !PANIC_ON_OOPS              817         default 0 if !PANIC_ON_OOPS
1037         default 1 if PANIC_ON_OOPS               818         default 1 if PANIC_ON_OOPS
1038                                                  819 
1039 config PANIC_TIMEOUT                             820 config PANIC_TIMEOUT
1040         int "panic timeout"                      821         int "panic timeout"
1041         default 0                                822         default 0
1042         help                                     823         help
1043           Set the timeout value (in seconds)  !! 824           Set the timeout value (in seconds) until a reboot occurs when the
1044           the kernel panics. If n = 0, then w    825           the kernel panics. If n = 0, then we wait forever. A timeout
1045           value n > 0 will wait n seconds bef    826           value n > 0 will wait n seconds before rebooting, while a timeout
1046           value n < 0 will reboot immediately !! 827           value n < 0 will reboot immediately.
1047           with the kernel command line option << 
1048           /proc/sys/kernel/panic.             << 
1049                                                  828 
1050 config LOCKUP_DETECTOR                           829 config LOCKUP_DETECTOR
1051         bool                                     830         bool
1052                                                  831 
1053 config SOFTLOCKUP_DETECTOR                       832 config SOFTLOCKUP_DETECTOR
1054         bool "Detect Soft Lockups"               833         bool "Detect Soft Lockups"
1055         depends on DEBUG_KERNEL && !S390         834         depends on DEBUG_KERNEL && !S390
1056         select LOCKUP_DETECTOR                   835         select LOCKUP_DETECTOR
1057         help                                     836         help
1058           Say Y here to enable the kernel to     837           Say Y here to enable the kernel to act as a watchdog to detect
1059           soft lockups.                          838           soft lockups.
1060                                                  839 
1061           Softlockups are bugs that cause the    840           Softlockups are bugs that cause the kernel to loop in kernel
1062           mode for more than 20 seconds, with    841           mode for more than 20 seconds, without giving other tasks a
1063           chance to run.  The current stack t    842           chance to run.  The current stack trace is displayed upon
1064           detection and the system will stay     843           detection and the system will stay locked up.
1065                                                  844 
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                845 config BOOTPARAM_SOFTLOCKUP_PANIC
1081         bool "Panic (Reboot) On Soft Lockups"    846         bool "Panic (Reboot) On Soft Lockups"
1082         depends on SOFTLOCKUP_DETECTOR           847         depends on SOFTLOCKUP_DETECTOR
1083         help                                     848         help
1084           Say Y here to enable the kernel to     849           Say Y here to enable the kernel to panic on "soft lockups",
1085           which are bugs that cause the kerne    850           which are bugs that cause the kernel to loop in kernel
1086           mode for more than 20 seconds (conf    851           mode for more than 20 seconds (configurable using the watchdog_thresh
1087           sysctl), without giving other tasks    852           sysctl), without giving other tasks a chance to run.
1088                                                  853 
1089           The panic can be used in combinatio    854           The panic can be used in combination with panic_timeout,
1090           to cause the system to reboot autom    855           to cause the system to reboot automatically after a
1091           lockup has been detected. This feat    856           lockup has been detected. This feature is useful for
1092           high-availability systems that have    857           high-availability systems that have uptime guarantees and
1093           where a lockup must be resolved ASA    858           where a lockup must be resolved ASAP.
1094                                                  859 
1095           Say N if unsure.                       860           Say N if unsure.
1096                                                  861 
1097 config HAVE_HARDLOCKUP_DETECTOR_BUDDY         !! 862 config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
                                                   >> 863         int
                                                   >> 864         depends on SOFTLOCKUP_DETECTOR
                                                   >> 865         range 0 1
                                                   >> 866         default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
                                                   >> 867         default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
                                                   >> 868 
                                                   >> 869 config HARDLOCKUP_DETECTOR_PERF
1098         bool                                     870         bool
1099         depends on SMP                        !! 871         select SOFTLOCKUP_DETECTOR
1100         default y                             << 
1101                                                  872 
1102 #                                                873 #
1103 # Global switch whether to build a hardlockup !! 874 # Enables a timestamp based low pass filter to compensate for perf based
1104 # only when the architecture supports at leas !! 875 # hard lockup detection which runs too fast due to turbo modes.
1105 # two exceptions. The hardlockup detector is  << 
1106 #                                                876 #
1107 #       s390: it reported many false positive !! 877 config HARDLOCKUP_CHECK_TIMESTAMP
                                                   >> 878         bool
                                                   >> 879 
1108 #                                                880 #
1109 #       sparc64: has a custom implementation  !! 881 # arch/ can define HAVE_HARDLOCKUP_DETECTOR_ARCH to provide their own hard
1110 #               hardlockup command line optio !! 882 # lockup detector rather than the perf based detector.
1111 #                                                883 #
1112 config HARDLOCKUP_DETECTOR                       884 config HARDLOCKUP_DETECTOR
1113         bool "Detect Hard Lockups"               885         bool "Detect Hard Lockups"
1114         depends on DEBUG_KERNEL && !S390 && ! !! 886         depends on DEBUG_KERNEL && !S390
1115         depends on HAVE_HARDLOCKUP_DETECTOR_P !! 887         depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_ARCH
1116         imply HARDLOCKUP_DETECTOR_PERF        << 
1117         imply HARDLOCKUP_DETECTOR_BUDDY       << 
1118         imply HARDLOCKUP_DETECTOR_ARCH        << 
1119         select LOCKUP_DETECTOR                   888         select LOCKUP_DETECTOR
1120                                               !! 889         select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF
                                                   >> 890         select HARDLOCKUP_DETECTOR_ARCH if HAVE_HARDLOCKUP_DETECTOR_ARCH
1121         help                                     891         help
1122           Say Y here to enable the kernel to     892           Say Y here to enable the kernel to act as a watchdog to detect
1123           hard lockups.                          893           hard lockups.
1124                                                  894 
1125           Hardlockups are bugs that cause the    895           Hardlockups are bugs that cause the CPU to loop in kernel mode
1126           for more than 10 seconds, without l    896           for more than 10 seconds, without letting other interrupts have a
1127           chance to run.  The current stack t    897           chance to run.  The current stack trace is displayed upon detection
1128           and the system will stay locked up.    898           and the system will stay locked up.
1129                                                  899 
1130 #                                             << 
1131 # Note that arch-specific variants are always << 
1132 #                                             << 
1133 config HARDLOCKUP_DETECTOR_PREFER_BUDDY       << 
1134         bool "Prefer the buddy CPU hardlockup << 
1135         depends on HARDLOCKUP_DETECTOR        << 
1136         depends on HAVE_HARDLOCKUP_DETECTOR_P << 
1137         depends on !HAVE_HARDLOCKUP_DETECTOR_ << 
1138         help                                  << 
1139           Say Y here to prefer the buddy hard << 
1140                                               << 
1141           With the buddy detector, each CPU u << 
1142           to check that the next CPU is proce << 
1143           verifying that a counter is increas << 
1144                                               << 
1145           This hardlockup detector is useful  << 
1146           an arch-specific hardlockup detecto << 
1147           for the hardlockup detector are bet << 
1148                                               << 
1149 config HARDLOCKUP_DETECTOR_PERF               << 
1150         bool                                  << 
1151         depends on HARDLOCKUP_DETECTOR        << 
1152         depends on HAVE_HARDLOCKUP_DETECTOR_P << 
1153         depends on !HAVE_HARDLOCKUP_DETECTOR_ << 
1154         select HARDLOCKUP_DETECTOR_COUNTS_HRT << 
1155                                               << 
1156 config HARDLOCKUP_DETECTOR_BUDDY              << 
1157         bool                                  << 
1158         depends on HARDLOCKUP_DETECTOR        << 
1159         depends on HAVE_HARDLOCKUP_DETECTOR_B << 
1160         depends on !HAVE_HARDLOCKUP_DETECTOR_ << 
1161         depends on !HAVE_HARDLOCKUP_DETECTOR_ << 
1162         select HARDLOCKUP_DETECTOR_COUNTS_HRT << 
1163                                               << 
1164 config HARDLOCKUP_DETECTOR_ARCH               << 
1165         bool                                  << 
1166         depends on HARDLOCKUP_DETECTOR        << 
1167         depends on HAVE_HARDLOCKUP_DETECTOR_A << 
1168         help                                  << 
1169           The arch-specific implementation of << 
1170           be used.                            << 
1171                                               << 
1172 #                                             << 
1173 # Both the "perf" and "buddy" hardlockup dete << 
1174 # interrupts. This config enables functions m << 
1175 #                                             << 
1176 config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER     << 
1177         bool                                  << 
1178         select SOFTLOCKUP_DETECTOR            << 
1179                                               << 
1180 #                                             << 
1181 # Enables a timestamp based low pass filter t << 
1182 # hard lockup detection which runs too fast d << 
1183 #                                             << 
1184 config HARDLOCKUP_CHECK_TIMESTAMP             << 
1185         bool                                  << 
1186                                               << 
1187 config BOOTPARAM_HARDLOCKUP_PANIC                900 config BOOTPARAM_HARDLOCKUP_PANIC
1188         bool "Panic (Reboot) On Hard Lockups"    901         bool "Panic (Reboot) On Hard Lockups"
1189         depends on HARDLOCKUP_DETECTOR           902         depends on HARDLOCKUP_DETECTOR
1190         help                                     903         help
1191           Say Y here to enable the kernel to     904           Say Y here to enable the kernel to panic on "hard lockups",
1192           which are bugs that cause the kerne    905           which are bugs that cause the kernel to loop in kernel
1193           mode with interrupts disabled for m    906           mode with interrupts disabled for more than 10 seconds (configurable
1194           using the watchdog_thresh sysctl).     907           using the watchdog_thresh sysctl).
1195                                                  908 
1196           Say N if unsure.                       909           Say N if unsure.
1197                                                  910 
                                                   >> 911 config BOOTPARAM_HARDLOCKUP_PANIC_VALUE
                                                   >> 912         int
                                                   >> 913         depends on HARDLOCKUP_DETECTOR
                                                   >> 914         range 0 1
                                                   >> 915         default 0 if !BOOTPARAM_HARDLOCKUP_PANIC
                                                   >> 916         default 1 if BOOTPARAM_HARDLOCKUP_PANIC
                                                   >> 917 
1198 config DETECT_HUNG_TASK                          918 config DETECT_HUNG_TASK
1199         bool "Detect Hung Tasks"                 919         bool "Detect Hung Tasks"
1200         depends on DEBUG_KERNEL                  920         depends on DEBUG_KERNEL
1201         default SOFTLOCKUP_DETECTOR              921         default SOFTLOCKUP_DETECTOR
1202         help                                     922         help
1203           Say Y here to enable the kernel to     923           Say Y here to enable the kernel to detect "hung tasks",
1204           which are bugs that cause the task     924           which are bugs that cause the task to be stuck in
1205           uninterruptible "D" state indefinit    925           uninterruptible "D" state indefinitely.
1206                                                  926 
1207           When a hung task is detected, the k    927           When a hung task is detected, the kernel will print the
1208           current stack trace (which you shou    928           current stack trace (which you should report), but the
1209           task will stay in uninterruptible s    929           task will stay in uninterruptible state. If lockdep is
1210           enabled then all held locks will al    930           enabled then all held locks will also be reported. This
1211           feature has negligible overhead.       931           feature has negligible overhead.
1212                                                  932 
1213 config DEFAULT_HUNG_TASK_TIMEOUT                 933 config DEFAULT_HUNG_TASK_TIMEOUT
1214         int "Default timeout for hung task de    934         int "Default timeout for hung task detection (in seconds)"
1215         depends on DETECT_HUNG_TASK              935         depends on DETECT_HUNG_TASK
1216         default 120                              936         default 120
1217         help                                     937         help
1218           This option controls the default ti    938           This option controls the default timeout (in seconds) used
1219           to determine when a task has become    939           to determine when a task has become non-responsive and should
1220           be considered hung.                    940           be considered hung.
1221                                                  941 
1222           It can be adjusted at runtime via t    942           It can be adjusted at runtime via the kernel.hung_task_timeout_secs
1223           sysctl or by writing a value to        943           sysctl or by writing a value to
1224           /proc/sys/kernel/hung_task_timeout_    944           /proc/sys/kernel/hung_task_timeout_secs.
1225                                                  945 
1226           A timeout of 0 disables the check.     946           A timeout of 0 disables the check.  The default is two minutes.
1227           Keeping the default should be fine     947           Keeping the default should be fine in most cases.
1228                                                  948 
1229 config BOOTPARAM_HUNG_TASK_PANIC                 949 config BOOTPARAM_HUNG_TASK_PANIC
1230         bool "Panic (Reboot) On Hung Tasks"      950         bool "Panic (Reboot) On Hung Tasks"
1231         depends on DETECT_HUNG_TASK              951         depends on DETECT_HUNG_TASK
1232         help                                     952         help
1233           Say Y here to enable the kernel to     953           Say Y here to enable the kernel to panic on "hung tasks",
1234           which are bugs that cause the kerne    954           which are bugs that cause the kernel to leave a task stuck
1235           in uninterruptible "D" state.          955           in uninterruptible "D" state.
1236                                                  956 
1237           The panic can be used in combinatio    957           The panic can be used in combination with panic_timeout,
1238           to cause the system to reboot autom    958           to cause the system to reboot automatically after a
1239           hung task has been detected. This f    959           hung task has been detected. This feature is useful for
1240           high-availability systems that have    960           high-availability systems that have uptime guarantees and
1241           where a hung tasks must be resolved    961           where a hung tasks must be resolved ASAP.
1242                                                  962 
1243           Say N if unsure.                       963           Say N if unsure.
1244                                                  964 
                                                   >> 965 config BOOTPARAM_HUNG_TASK_PANIC_VALUE
                                                   >> 966         int
                                                   >> 967         depends on DETECT_HUNG_TASK
                                                   >> 968         range 0 1
                                                   >> 969         default 0 if !BOOTPARAM_HUNG_TASK_PANIC
                                                   >> 970         default 1 if BOOTPARAM_HUNG_TASK_PANIC
                                                   >> 971 
1245 config WQ_WATCHDOG                               972 config WQ_WATCHDOG
1246         bool "Detect Workqueue Stalls"           973         bool "Detect Workqueue Stalls"
1247         depends on DEBUG_KERNEL                  974         depends on DEBUG_KERNEL
1248         help                                     975         help
1249           Say Y here to enable stall detectio    976           Say Y here to enable stall detection on workqueues.  If a
1250           worker pool doesn't make forward pr    977           worker pool doesn't make forward progress on a pending work
1251           item for over a given amount of tim    978           item for over a given amount of time, 30s by default, a
1252           warning message is printed along wi    979           warning message is printed along with dump of workqueue
1253           state.  This can be configured thro    980           state.  This can be configured through kernel parameter
1254           "workqueue.watchdog_thresh" and its    981           "workqueue.watchdog_thresh" and its sysfs counterpart.
1255                                                  982 
1256 config WQ_CPU_INTENSIVE_REPORT                << 
1257         bool "Report per-cpu work items which << 
1258         depends on DEBUG_KERNEL               << 
1259         help                                  << 
1260           Say Y here to enable reporting of c << 
1261           items that hog CPUs for longer than << 
1262           workqueue.cpu_intensive_thresh_us.  << 
1263           detects and excludes them from conc << 
1264           them from stalling other per-cpu wo << 
1265           triggering may not necessarily indi << 
1266           triggering likely indicates that th << 
1267           to use an unbound workqueue.        << 
1268                                               << 
1269 config TEST_LOCKUP                            << 
1270         tristate "Test module to generate loc << 
1271         depends on m                          << 
1272         help                                  << 
1273           This builds the "test_lockup" modul << 
1274           that watchdogs and lockup detectors << 
1275                                               << 
1276           Depending on module parameters it c << 
1277           lockup, "hung task", or locking arb << 
1278           Also it could generate series of lo << 
1279                                               << 
1280           If unsure, say N.                   << 
1281                                               << 
1282 endmenu # "Debug lockups and hangs"              983 endmenu # "Debug lockups and hangs"
1283                                                  984 
1284 menu "Scheduler Debugging"                       985 menu "Scheduler Debugging"
1285                                                  986 
1286 config SCHED_DEBUG                               987 config SCHED_DEBUG
1287         bool "Collect scheduler debugging inf    988         bool "Collect scheduler debugging info"
1288         depends on DEBUG_KERNEL && DEBUG_FS   !! 989         depends on DEBUG_KERNEL && PROC_FS
1289         default y                                990         default y
1290         help                                     991         help
1291           If you say Y here, the /sys/kernel/ !! 992           If you say Y here, the /proc/sched_debug file will be provided
1292           that can help debug the scheduler.     993           that can help debug the scheduler. The runtime overhead of this
1293           option is minimal.                     994           option is minimal.
1294                                                  995 
1295 config SCHED_INFO                                996 config SCHED_INFO
1296         bool                                     997         bool
1297         default n                                998         default n
1298                                                  999 
1299 config SCHEDSTATS                                1000 config SCHEDSTATS
1300         bool "Collect scheduler statistics"      1001         bool "Collect scheduler statistics"
1301         depends on PROC_FS                    !! 1002         depends on DEBUG_KERNEL && PROC_FS
1302         select SCHED_INFO                        1003         select SCHED_INFO
1303         help                                     1004         help
1304           If you say Y here, additional code     1005           If you say Y here, additional code will be inserted into the
1305           scheduler and related routines to c    1006           scheduler and related routines to collect statistics about
1306           scheduler behavior and provide them    1007           scheduler behavior and provide them in /proc/schedstat.  These
1307           stats may be useful for both tuning    1008           stats may be useful for both tuning and debugging the scheduler
1308           If you aren't debugging the schedul    1009           If you aren't debugging the scheduler or trying to tune a specific
1309           application, you can say N to avoid    1010           application, you can say N to avoid the very slight overhead
1310           this adds.                             1011           this adds.
1311                                                  1012 
1312 endmenu                                          1013 endmenu
1313                                                  1014 
1314 config DEBUG_TIMEKEEPING                         1015 config DEBUG_TIMEKEEPING
1315         bool "Enable extra timekeeping sanity    1016         bool "Enable extra timekeeping sanity checking"
1316         help                                     1017         help
1317           This option will enable additional     1018           This option will enable additional timekeeping sanity checks
1318           which may be helpful when diagnosin    1019           which may be helpful when diagnosing issues where timekeeping
1319           problems are suspected.                1020           problems are suspected.
1320                                                  1021 
1321           This may include checks in the time    1022           This may include checks in the timekeeping hotpaths, so this
1322           option may have a (very small) perf    1023           option may have a (very small) performance impact to some
1323           workloads.                             1024           workloads.
1324                                                  1025 
1325           If unsure, say N.                      1026           If unsure, say N.
1326                                                  1027 
1327 config DEBUG_PREEMPT                             1028 config DEBUG_PREEMPT
1328         bool "Debug preemptible kernel"          1029         bool "Debug preemptible kernel"
1329         depends on DEBUG_KERNEL && PREEMPTION    1030         depends on DEBUG_KERNEL && PREEMPTION && TRACE_IRQFLAGS_SUPPORT
                                                   >> 1031         default y
1330         help                                     1032         help
1331           If you say Y here then the kernel w    1033           If you say Y here then the kernel will use a debug variant of the
1332           commonly used smp_processor_id() fu    1034           commonly used smp_processor_id() function and will print warnings
1333           if kernel code uses it in a preempt    1035           if kernel code uses it in a preemption-unsafe way. Also, the kernel
1334           will detect preemption count underf    1036           will detect preemption count underflows.
1335                                                  1037 
1336           This option has potential to introd << 
1337           depending on workload as it trigger << 
1338           this_cpu operation. It should only  << 
1339                                               << 
1340 menu "Lock Debugging (spinlocks, mutexes, etc    1038 menu "Lock Debugging (spinlocks, mutexes, etc...)"
1341                                                  1039 
1342 config LOCK_DEBUGGING_SUPPORT                    1040 config LOCK_DEBUGGING_SUPPORT
1343         bool                                     1041         bool
1344         depends on TRACE_IRQFLAGS_SUPPORT &&     1042         depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
1345         default y                                1043         default y
1346                                                  1044 
1347 config PROVE_LOCKING                             1045 config PROVE_LOCKING
1348         bool "Lock debugging: prove locking c    1046         bool "Lock debugging: prove locking correctness"
1349         depends on DEBUG_KERNEL && LOCK_DEBUG    1047         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1350         select LOCKDEP                           1048         select LOCKDEP
1351         select DEBUG_SPINLOCK                    1049         select DEBUG_SPINLOCK
1352         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1050         select DEBUG_MUTEXES
1353         select DEBUG_RT_MUTEXES if RT_MUTEXES    1051         select DEBUG_RT_MUTEXES if RT_MUTEXES
1354         select DEBUG_RWSEMS if !PREEMPT_RT    !! 1052         select DEBUG_RWSEMS
1355         select DEBUG_WW_MUTEX_SLOWPATH           1053         select DEBUG_WW_MUTEX_SLOWPATH
1356         select DEBUG_LOCK_ALLOC                  1054         select DEBUG_LOCK_ALLOC
1357         select PREEMPT_COUNT if !ARCH_NO_PREE << 
1358         select TRACE_IRQFLAGS                    1055         select TRACE_IRQFLAGS
1359         default n                                1056         default n
1360         help                                     1057         help
1361          This feature enables the kernel to p    1058          This feature enables the kernel to prove that all locking
1362          that occurs in the kernel runtime is    1059          that occurs in the kernel runtime is mathematically
1363          correct: that under no circumstance     1060          correct: that under no circumstance could an arbitrary (and
1364          not yet triggered) combination of ob    1061          not yet triggered) combination of observed locking
1365          sequences (on an arbitrary number of    1062          sequences (on an arbitrary number of CPUs, running an
1366          arbitrary number of tasks and interr    1063          arbitrary number of tasks and interrupt contexts) cause a
1367          deadlock.                               1064          deadlock.
1368                                                  1065 
1369          In short, this feature enables the k    1066          In short, this feature enables the kernel to report locking
1370          related deadlocks before they actual    1067          related deadlocks before they actually occur.
1371                                                  1068 
1372          The proof does not depend on how har    1069          The proof does not depend on how hard and complex a
1373          deadlock scenario would be to trigge    1070          deadlock scenario would be to trigger: how many
1374          participant CPUs, tasks and irq-cont    1071          participant CPUs, tasks and irq-contexts would be needed
1375          for it to trigger. The proof also do    1072          for it to trigger. The proof also does not depend on
1376          timing: if a race and a resulting de    1073          timing: if a race and a resulting deadlock is possible
1377          theoretically (no matter how unlikel    1074          theoretically (no matter how unlikely the race scenario
1378          is), it will be proven so and will i    1075          is), it will be proven so and will immediately be
1379          reported by the kernel (once the eve    1076          reported by the kernel (once the event is observed that
1380          makes the deadlock theoretically pos    1077          makes the deadlock theoretically possible).
1381                                                  1078 
1382          If a deadlock is impossible (i.e. th    1079          If a deadlock is impossible (i.e. the locking rules, as
1383          observed by the kernel, are mathemat    1080          observed by the kernel, are mathematically correct), the
1384          kernel reports nothing.                 1081          kernel reports nothing.
1385                                                  1082 
1386          NOTE: this feature can also be enabl    1083          NOTE: this feature can also be enabled for rwlocks, mutexes
1387          and rwsems - in which case all depen    1084          and rwsems - in which case all dependencies between these
1388          different locking variants are obser    1085          different locking variants are observed and mapped too, and
1389          the proof of observed correctness is    1086          the proof of observed correctness is also maintained for an
1390          arbitrary combination of these separ    1087          arbitrary combination of these separate locking variants.
1391                                                  1088 
1392          For more details, see Documentation/    1089          For more details, see Documentation/locking/lockdep-design.rst.
1393                                                  1090 
1394 config PROVE_RAW_LOCK_NESTING                 << 
1395         bool "Enable raw_spinlock - spinlock  << 
1396         depends on PROVE_LOCKING              << 
1397         default n                             << 
1398         help                                  << 
1399          Enable the raw_spinlock vs. spinlock << 
1400          that the lock nesting rules for PREE << 
1401          not violated.                        << 
1402                                               << 
1403          NOTE: There are known nesting proble << 
1404          option expect lockdep splats until t << 
1405          addressed which is work in progress. << 
1406          identify and analyze these problems. << 
1407          check permanently enabled once the m << 
1408                                               << 
1409          If unsure, select N.                 << 
1410                                               << 
1411 config LOCK_STAT                                 1091 config LOCK_STAT
1412         bool "Lock usage statistics"             1092         bool "Lock usage statistics"
1413         depends on DEBUG_KERNEL && LOCK_DEBUG    1093         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1414         select LOCKDEP                           1094         select LOCKDEP
1415         select DEBUG_SPINLOCK                    1095         select DEBUG_SPINLOCK
1416         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1096         select DEBUG_MUTEXES
1417         select DEBUG_RT_MUTEXES if RT_MUTEXES    1097         select DEBUG_RT_MUTEXES if RT_MUTEXES
1418         select DEBUG_LOCK_ALLOC                  1098         select DEBUG_LOCK_ALLOC
1419         default n                                1099         default n
1420         help                                     1100         help
1421          This feature enables tracking lock c    1101          This feature enables tracking lock contention points
1422                                                  1102 
1423          For more details, see Documentation/    1103          For more details, see Documentation/locking/lockstat.rst
1424                                                  1104 
1425          This also enables lock events requir    1105          This also enables lock events required by "perf lock",
1426          subcommand of perf.                     1106          subcommand of perf.
1427          If you want to use "perf lock", you     1107          If you want to use "perf lock", you also need to turn on
1428          CONFIG_EVENT_TRACING.                   1108          CONFIG_EVENT_TRACING.
1429                                                  1109 
1430          CONFIG_LOCK_STAT defines "contended"    1110          CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
1431          (CONFIG_LOCKDEP defines "acquire" an    1111          (CONFIG_LOCKDEP defines "acquire" and "release" events.)
1432                                                  1112 
1433 config DEBUG_RT_MUTEXES                          1113 config DEBUG_RT_MUTEXES
1434         bool "RT Mutex debugging, deadlock de    1114         bool "RT Mutex debugging, deadlock detection"
1435         depends on DEBUG_KERNEL && RT_MUTEXES    1115         depends on DEBUG_KERNEL && RT_MUTEXES
1436         help                                     1116         help
1437          This allows rt mutex semantics viola    1117          This allows rt mutex semantics violations and rt mutex related
1438          deadlocks (lockups) to be detected a    1118          deadlocks (lockups) to be detected and reported automatically.
1439                                                  1119 
1440 config DEBUG_SPINLOCK                            1120 config DEBUG_SPINLOCK
1441         bool "Spinlock and rw-lock debugging:    1121         bool "Spinlock and rw-lock debugging: basic checks"
1442         depends on DEBUG_KERNEL                  1122         depends on DEBUG_KERNEL
1443         select UNINLINE_SPIN_UNLOCK              1123         select UNINLINE_SPIN_UNLOCK
1444         help                                     1124         help
1445           Say Y here and build SMP to catch m    1125           Say Y here and build SMP to catch missing spinlock initialization
1446           and certain other kinds of spinlock    1126           and certain other kinds of spinlock errors commonly made.  This is
1447           best used in conjunction with the N    1127           best used in conjunction with the NMI watchdog so that spinlock
1448           deadlocks are also debuggable.         1128           deadlocks are also debuggable.
1449                                                  1129 
1450 config DEBUG_MUTEXES                             1130 config DEBUG_MUTEXES
1451         bool "Mutex debugging: basic checks"     1131         bool "Mutex debugging: basic checks"
1452         depends on DEBUG_KERNEL && !PREEMPT_R !! 1132         depends on DEBUG_KERNEL
1453         help                                     1133         help
1454          This feature allows mutex semantics     1134          This feature allows mutex semantics violations to be detected and
1455          reported.                               1135          reported.
1456                                                  1136 
1457 config DEBUG_WW_MUTEX_SLOWPATH                   1137 config DEBUG_WW_MUTEX_SLOWPATH
1458         bool "Wait/wound mutex debugging: Slo    1138         bool "Wait/wound mutex debugging: Slowpath testing"
1459         depends on DEBUG_KERNEL && LOCK_DEBUG    1139         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1460         select DEBUG_LOCK_ALLOC                  1140         select DEBUG_LOCK_ALLOC
1461         select DEBUG_SPINLOCK                    1141         select DEBUG_SPINLOCK
1462         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1142         select DEBUG_MUTEXES
1463         select DEBUG_RT_MUTEXES if PREEMPT_RT << 
1464         help                                     1143         help
1465          This feature enables slowpath testin    1144          This feature enables slowpath testing for w/w mutex users by
1466          injecting additional -EDEADLK wound/    1145          injecting additional -EDEADLK wound/backoff cases. Together with
1467          the full mutex checks enabled with (    1146          the full mutex checks enabled with (CONFIG_PROVE_LOCKING) this
1468          will test all possible w/w mutex int    1147          will test all possible w/w mutex interface abuse with the
1469          exception of simply not acquiring al    1148          exception of simply not acquiring all the required locks.
1470          Note that this feature can introduce    1149          Note that this feature can introduce significant overhead, so
1471          it really should not be enabled in a    1150          it really should not be enabled in a production or distro kernel,
1472          even a debug kernel.  If you are a d    1151          even a debug kernel.  If you are a driver writer, enable it.  If
1473          you are a distro, do not.               1152          you are a distro, do not.
1474                                                  1153 
1475 config DEBUG_RWSEMS                              1154 config DEBUG_RWSEMS
1476         bool "RW Semaphore debugging: basic c    1155         bool "RW Semaphore debugging: basic checks"
1477         depends on DEBUG_KERNEL && !PREEMPT_R !! 1156         depends on DEBUG_KERNEL
1478         help                                     1157         help
1479           This debugging feature allows misma    1158           This debugging feature allows mismatched rw semaphore locks
1480           and unlocks to be detected and repo    1159           and unlocks to be detected and reported.
1481                                                  1160 
1482 config DEBUG_LOCK_ALLOC                          1161 config DEBUG_LOCK_ALLOC
1483         bool "Lock debugging: detect incorrec    1162         bool "Lock debugging: detect incorrect freeing of live locks"
1484         depends on DEBUG_KERNEL && LOCK_DEBUG    1163         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1485         select DEBUG_SPINLOCK                    1164         select DEBUG_SPINLOCK
1486         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1165         select DEBUG_MUTEXES
1487         select DEBUG_RT_MUTEXES if RT_MUTEXES    1166         select DEBUG_RT_MUTEXES if RT_MUTEXES
1488         select LOCKDEP                           1167         select LOCKDEP
1489         help                                     1168         help
1490          This feature will check whether any     1169          This feature will check whether any held lock (spinlock, rwlock,
1491          mutex or rwsem) is incorrectly freed    1170          mutex or rwsem) is incorrectly freed by the kernel, via any of the
1492          memory-freeing routines (kfree(), km    1171          memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
1493          vfree(), etc.), whether a live lock     1172          vfree(), etc.), whether a live lock is incorrectly reinitialized via
1494          spin_lock_init()/mutex_init()/etc.,     1173          spin_lock_init()/mutex_init()/etc., or whether there is any lock
1495          held during task exit.                  1174          held during task exit.
1496                                                  1175 
1497 config LOCKDEP                                   1176 config LOCKDEP
1498         bool                                     1177         bool
1499         depends on DEBUG_KERNEL && LOCK_DEBUG    1178         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1500         select STACKTRACE                        1179         select STACKTRACE
                                                   >> 1180         select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !X86
1501         select KALLSYMS                          1181         select KALLSYMS
1502         select KALLSYMS_ALL                      1182         select KALLSYMS_ALL
1503                                                  1183 
1504 config LOCKDEP_SMALL                             1184 config LOCKDEP_SMALL
1505         bool                                     1185         bool
1506                                                  1186 
1507 config LOCKDEP_BITS                           << 
1508         int "Bitsize for MAX_LOCKDEP_ENTRIES" << 
1509         depends on LOCKDEP && !LOCKDEP_SMALL  << 
1510         range 10 30                           << 
1511         default 15                            << 
1512         help                                  << 
1513           Try increasing this value if you hi << 
1514                                               << 
1515 config LOCKDEP_CHAINS_BITS                    << 
1516         int "Bitsize for MAX_LOCKDEP_CHAINS"  << 
1517         depends on LOCKDEP && !LOCKDEP_SMALL  << 
1518         range 10 30                           << 
1519         default 16                            << 
1520         help                                  << 
1521           Try increasing this value if you hi << 
1522                                               << 
1523 config LOCKDEP_STACK_TRACE_BITS               << 
1524         int "Bitsize for MAX_STACK_TRACE_ENTR << 
1525         depends on LOCKDEP && !LOCKDEP_SMALL  << 
1526         range 10 30                           << 
1527         default 19                            << 
1528         help                                  << 
1529           Try increasing this value if you hi << 
1530                                               << 
1531 config LOCKDEP_STACK_TRACE_HASH_BITS          << 
1532         int "Bitsize for STACK_TRACE_HASH_SIZ << 
1533         depends on LOCKDEP && !LOCKDEP_SMALL  << 
1534         range 10 30                           << 
1535         default 14                            << 
1536         help                                  << 
1537           Try increasing this value if you ne << 
1538                                               << 
1539 config LOCKDEP_CIRCULAR_QUEUE_BITS            << 
1540         int "Bitsize for elements in circular << 
1541         depends on LOCKDEP                    << 
1542         range 10 30                           << 
1543         default 12                            << 
1544         help                                  << 
1545           Try increasing this value if you hi << 
1546                                               << 
1547 config DEBUG_LOCKDEP                             1187 config DEBUG_LOCKDEP
1548         bool "Lock dependency engine debuggin    1188         bool "Lock dependency engine debugging"
1549         depends on DEBUG_KERNEL && LOCKDEP       1189         depends on DEBUG_KERNEL && LOCKDEP
1550         select DEBUG_IRQFLAGS                 << 
1551         help                                     1190         help
1552           If you say Y here, the lock depende    1191           If you say Y here, the lock dependency engine will do
1553           additional runtime checks to debug     1192           additional runtime checks to debug itself, at the price
1554           of more runtime overhead.              1193           of more runtime overhead.
1555                                                  1194 
1556 config DEBUG_ATOMIC_SLEEP                        1195 config DEBUG_ATOMIC_SLEEP
1557         bool "Sleep inside atomic section che    1196         bool "Sleep inside atomic section checking"
1558         select PREEMPT_COUNT                     1197         select PREEMPT_COUNT
1559         depends on DEBUG_KERNEL                  1198         depends on DEBUG_KERNEL
1560         depends on !ARCH_NO_PREEMPT              1199         depends on !ARCH_NO_PREEMPT
1561         help                                     1200         help
1562           If you say Y here, various routines    1201           If you say Y here, various routines which may sleep will become very
1563           noisy if they are called inside ato    1202           noisy if they are called inside atomic sections: when a spinlock is
1564           held, inside an rcu read side criti    1203           held, inside an rcu read side critical section, inside preempt disabled
1565           sections, inside an interrupt, etc.    1204           sections, inside an interrupt, etc...
1566                                                  1205 
1567 config DEBUG_LOCKING_API_SELFTESTS               1206 config DEBUG_LOCKING_API_SELFTESTS
1568         bool "Locking API boot-time self-test    1207         bool "Locking API boot-time self-tests"
1569         depends on DEBUG_KERNEL                  1208         depends on DEBUG_KERNEL
1570         help                                     1209         help
1571           Say Y here if you want the kernel t    1210           Say Y here if you want the kernel to run a short self-test during
1572           bootup. The self-test checks whethe    1211           bootup. The self-test checks whether common types of locking bugs
1573           are detected by debugging mechanism    1212           are detected by debugging mechanisms or not. (if you disable
1574           lock debugging then those bugs won' !! 1213           lock debugging then those bugs wont be detected of course.)
1575           The following locking APIs are cove    1214           The following locking APIs are covered: spinlocks, rwlocks,
1576           mutexes and rwsems.                    1215           mutexes and rwsems.
1577                                                  1216 
1578 config LOCK_TORTURE_TEST                         1217 config LOCK_TORTURE_TEST
1579         tristate "torture tests for locking"     1218         tristate "torture tests for locking"
1580         depends on DEBUG_KERNEL                  1219         depends on DEBUG_KERNEL
1581         select TORTURE_TEST                      1220         select TORTURE_TEST
1582         help                                     1221         help
1583           This option provides a kernel modul    1222           This option provides a kernel module that runs torture tests
1584           on kernel locking primitives.  The     1223           on kernel locking primitives.  The kernel module may be built
1585           after the fact on the running kerne    1224           after the fact on the running kernel to be tested, if desired.
1586                                                  1225 
1587           Say Y here if you want kernel locki    1226           Say Y here if you want kernel locking-primitive torture tests
1588           to be built into the kernel.           1227           to be built into the kernel.
1589           Say M if you want these torture tes    1228           Say M if you want these torture tests to build as a module.
1590           Say N if you are unsure.               1229           Say N if you are unsure.
1591                                                  1230 
1592 config WW_MUTEX_SELFTEST                         1231 config WW_MUTEX_SELFTEST
1593         tristate "Wait/wound mutex selftests"    1232         tristate "Wait/wound mutex selftests"
1594         help                                     1233         help
1595           This option provides a kernel modul    1234           This option provides a kernel module that runs tests on the
1596           on the struct ww_mutex locking API.    1235           on the struct ww_mutex locking API.
1597                                                  1236 
1598           It is recommended to enable DEBUG_W    1237           It is recommended to enable DEBUG_WW_MUTEX_SLOWPATH in conjunction
1599           with this test harness.                1238           with this test harness.
1600                                                  1239 
1601           Say M if you want these self tests     1240           Say M if you want these self tests to build as a module.
1602           Say N if you are unsure.               1241           Say N if you are unsure.
1603                                                  1242 
1604 config SCF_TORTURE_TEST                       << 
1605         tristate "torture tests for smp_call_ << 
1606         depends on DEBUG_KERNEL               << 
1607         select TORTURE_TEST                   << 
1608         help                                  << 
1609           This option provides a kernel modul << 
1610           on the smp_call_function() family o << 
1611           module may be built after the fact  << 
1612           be tested, if desired.              << 
1613                                               << 
1614 config CSD_LOCK_WAIT_DEBUG                    << 
1615         bool "Debugging for csd_lock_wait(),  << 
1616         depends on DEBUG_KERNEL               << 
1617         depends on 64BIT                      << 
1618         default n                             << 
1619         help                                  << 
1620           This option enables debug prints wh << 
1621           to the smp_call_function*() IPI wra << 
1622           include the IPI handler function cu << 
1623           and relevant stack traces.          << 
1624                                               << 
1625 config CSD_LOCK_WAIT_DEBUG_DEFAULT            << 
1626         bool "Default csd_lock_wait() debuggi << 
1627         depends on CSD_LOCK_WAIT_DEBUG        << 
1628         depends on 64BIT                      << 
1629         default n                             << 
1630         help                                  << 
1631           This option causes the csdlock_debu << 
1632           default to 1 (basic debugging) inst << 
1633                                               << 
1634 endmenu # lock debugging                         1243 endmenu # lock debugging
1635                                                  1244 
1636 config TRACE_IRQFLAGS                            1245 config TRACE_IRQFLAGS
1637         depends on TRACE_IRQFLAGS_SUPPORT     << 
1638         bool                                     1246         bool
1639         help                                     1247         help
1640           Enables hooks to interrupt enabling    1248           Enables hooks to interrupt enabling and disabling for
1641           either tracing or lock debugging.      1249           either tracing or lock debugging.
1642                                                  1250 
1643 config TRACE_IRQFLAGS_NMI                     << 
1644         def_bool y                            << 
1645         depends on TRACE_IRQFLAGS             << 
1646         depends on TRACE_IRQFLAGS_NMI_SUPPORT << 
1647                                               << 
1648 config NMI_CHECK_CPU                          << 
1649         bool "Debugging for CPUs failing to r << 
1650         depends on DEBUG_KERNEL               << 
1651         depends on X86                        << 
1652         default n                             << 
1653         help                                  << 
1654           Enables debug prints when a CPU fai << 
1655           backtrace NMI.  These prints provid << 
1656           might legitimately be failing to re << 
1657           is offline of if ignore_nmis is set << 
1658                                               << 
1659 config DEBUG_IRQFLAGS                         << 
1660         bool "Debug IRQ flag manipulation"    << 
1661         help                                  << 
1662           Enables checks for potentially unsa << 
1663           interrupts, such as calling raw_loc << 
1664           are enabled.                        << 
1665                                               << 
1666 config STACKTRACE                                1251 config STACKTRACE
1667         bool "Stack backtrace support"           1252         bool "Stack backtrace support"
1668         depends on STACKTRACE_SUPPORT            1253         depends on STACKTRACE_SUPPORT
1669         help                                     1254         help
1670           This option causes the kernel to cr    1255           This option causes the kernel to create a /proc/pid/stack for
1671           every process, showing its current     1256           every process, showing its current stack trace.
1672           It is also used by various kernel d    1257           It is also used by various kernel debugging features that require
1673           stack trace generation.                1258           stack trace generation.
1674                                                  1259 
1675 config WARN_ALL_UNSEEDED_RANDOM                  1260 config WARN_ALL_UNSEEDED_RANDOM
1676         bool "Warn for all uses of unseeded r    1261         bool "Warn for all uses of unseeded randomness"
1677         default n                                1262         default n
1678         help                                     1263         help
1679           Some parts of the kernel contain bu    1264           Some parts of the kernel contain bugs relating to their use of
1680           cryptographically secure random num    1265           cryptographically secure random numbers before it's actually possible
1681           to generate those numbers securely.    1266           to generate those numbers securely. This setting ensures that these
1682           flaws don't go unnoticed, by enabli    1267           flaws don't go unnoticed, by enabling a message, should this ever
1683           occur. This will allow people with     1268           occur. This will allow people with obscure setups to know when things
1684           are going wrong, so that they might    1269           are going wrong, so that they might contact developers about fixing
1685           it.                                    1270           it.
1686                                                  1271 
1687           Unfortunately, on some models of so    1272           Unfortunately, on some models of some architectures getting
1688           a fully seeded CRNG is extremely di    1273           a fully seeded CRNG is extremely difficult, and so this can
1689           result in dmesg getting spammed for    1274           result in dmesg getting spammed for a surprisingly long
1690           time.  This is really bad from a se    1275           time.  This is really bad from a security perspective, and
1691           so architecture maintainers really     1276           so architecture maintainers really need to do what they can
1692           to get the CRNG seeded sooner after    1277           to get the CRNG seeded sooner after the system is booted.
1693           However, since users cannot do anyt    1278           However, since users cannot do anything actionable to
1694           address this, by default this optio !! 1279           address this, by default the kernel will issue only a single
                                                   >> 1280           warning for the first use of unseeded randomness.
1695                                                  1281 
1696           Say Y here if you want to receive w    1282           Say Y here if you want to receive warnings for all uses of
1697           unseeded randomness.  This will be     1283           unseeded randomness.  This will be of use primarily for
1698           those developers interested in impr    1284           those developers interested in improving the security of
1699           Linux kernels running on their arch    1285           Linux kernels running on their architecture (or
1700           subarchitecture).                      1286           subarchitecture).
1701                                                  1287 
1702 config DEBUG_KOBJECT                             1288 config DEBUG_KOBJECT
1703         bool "kobject debugging"                 1289         bool "kobject debugging"
1704         depends on DEBUG_KERNEL                  1290         depends on DEBUG_KERNEL
1705         help                                     1291         help
1706           If you say Y here, some extra kobje    1292           If you say Y here, some extra kobject debugging messages will be sent
1707           to the syslog.                         1293           to the syslog.
1708                                                  1294 
1709 config DEBUG_KOBJECT_RELEASE                     1295 config DEBUG_KOBJECT_RELEASE
1710         bool "kobject release debugging"         1296         bool "kobject release debugging"
1711         depends on DEBUG_OBJECTS_TIMERS          1297         depends on DEBUG_OBJECTS_TIMERS
1712         help                                     1298         help
1713           kobjects are reference counted obje    1299           kobjects are reference counted objects.  This means that their
1714           last reference count put is not pre    1300           last reference count put is not predictable, and the kobject can
1715           live on past the point at which a d !! 1301           live on past the point at which a driver decides to drop it's
1716           initial reference to the kobject ga    1302           initial reference to the kobject gained on allocation.  An
1717           example of this would be a struct d    1303           example of this would be a struct device which has just been
1718           unregistered.                          1304           unregistered.
1719                                                  1305 
1720           However, some buggy drivers assume     1306           However, some buggy drivers assume that after such an operation,
1721           the memory backing the kobject can     1307           the memory backing the kobject can be immediately freed.  This
1722           goes completely against the princip    1308           goes completely against the principles of a refcounted object.
1723                                                  1309 
1724           If you say Y here, the kernel will     1310           If you say Y here, the kernel will delay the release of kobjects
1725           on the last reference count to impr    1311           on the last reference count to improve the visibility of this
1726           kind of kobject release bug.           1312           kind of kobject release bug.
1727                                                  1313 
1728 config HAVE_DEBUG_BUGVERBOSE                     1314 config HAVE_DEBUG_BUGVERBOSE
1729         bool                                     1315         bool
1730                                                  1316 
1731 menu "Debug kernel data structures"              1317 menu "Debug kernel data structures"
1732                                                  1318 
1733 config DEBUG_LIST                                1319 config DEBUG_LIST
1734         bool "Debug linked list manipulation"    1320         bool "Debug linked list manipulation"
1735         depends on DEBUG_KERNEL               !! 1321         depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
1736         select LIST_HARDENED                  << 
1737         help                                     1322         help
1738           Enable this to turn on extended che !! 1323           Enable this to turn on extended checks in the linked-list
1739           routines.                           !! 1324           walking routines.
1740                                               << 
1741           This option trades better quality e << 
1742           is more suitable for kernel debuggi << 
1743           you should only enable CONFIG_LIST_ << 
1744                                                  1325 
1745           If unsure, say N.                      1326           If unsure, say N.
1746                                                  1327 
1747 config DEBUG_PLIST                               1328 config DEBUG_PLIST
1748         bool "Debug priority linked list mani    1329         bool "Debug priority linked list manipulation"
1749         depends on DEBUG_KERNEL                  1330         depends on DEBUG_KERNEL
1750         help                                     1331         help
1751           Enable this to turn on extended che    1332           Enable this to turn on extended checks in the priority-ordered
1752           linked-list (plist) walking routine    1333           linked-list (plist) walking routines.  This checks the entire
1753           list multiple times during each man    1334           list multiple times during each manipulation.
1754                                                  1335 
1755           If unsure, say N.                      1336           If unsure, say N.
1756                                                  1337 
1757 config DEBUG_SG                                  1338 config DEBUG_SG
1758         bool "Debug SG table operations"         1339         bool "Debug SG table operations"
1759         depends on DEBUG_KERNEL                  1340         depends on DEBUG_KERNEL
1760         help                                     1341         help
1761           Enable this to turn on checks on sc    1342           Enable this to turn on checks on scatter-gather tables. This can
1762           help find problems with drivers tha    1343           help find problems with drivers that do not properly initialize
1763           their sg tables.                       1344           their sg tables.
1764                                                  1345 
1765           If unsure, say N.                      1346           If unsure, say N.
1766                                                  1347 
1767 config DEBUG_NOTIFIERS                           1348 config DEBUG_NOTIFIERS
1768         bool "Debug notifier call chains"        1349         bool "Debug notifier call chains"
1769         depends on DEBUG_KERNEL                  1350         depends on DEBUG_KERNEL
1770         help                                     1351         help
1771           Enable this to turn on sanity check    1352           Enable this to turn on sanity checking for notifier call chains.
1772           This is most useful for kernel deve    1353           This is most useful for kernel developers to make sure that
1773           modules properly unregister themsel    1354           modules properly unregister themselves from notifier chains.
1774           This is a relatively cheap check bu    1355           This is a relatively cheap check but if you care about maximum
1775           performance, say N.                    1356           performance, say N.
1776                                                  1357 
1777 config DEBUG_CLOSURES                         !! 1358 config BUG_ON_DATA_CORRUPTION
1778         bool "Debug closures (bcache async wi !! 1359         bool "Trigger a BUG when data corruption is detected"
1779         depends on CLOSURES                   !! 1360         select DEBUG_LIST
1780         select DEBUG_FS                       !! 1361         help
1781         help                                  !! 1362           Select this option if the kernel should BUG when it encounters
1782           Keeps all active closures in a link !! 1363           data corruption in kernel memory structures when they get checked
1783           interface to list them, which makes !! 1364           for validity.
1784           operations that get stuck.          << 
1785                                                  1365 
1786 config DEBUG_MAPLE_TREE                       !! 1366           If unsure, say N.
1787         bool "Debug maple trees"              !! 1367 
                                                   >> 1368 endmenu
                                                   >> 1369 
                                                   >> 1370 config DEBUG_CREDENTIALS
                                                   >> 1371         bool "Debug credential management"
1788         depends on DEBUG_KERNEL                  1372         depends on DEBUG_KERNEL
1789         help                                     1373         help
1790           Enable maple tree debugging informa !! 1374           Enable this to turn on some debug checking for credential
                                                   >> 1375           management.  The additional code keeps track of the number of
                                                   >> 1376           pointers from task_structs to any given cred struct, and checks to
                                                   >> 1377           see that this number never exceeds the usage count of the cred
                                                   >> 1378           struct.
1791                                                  1379 
1792           If unsure, say N.                   !! 1380           Furthermore, if SELinux is enabled, this also checks that the
                                                   >> 1381           security pointer in the cred struct is never seen to be invalid.
1793                                                  1382 
1794 endmenu                                       !! 1383           If unsure, say N.
1795                                                  1384 
1796 source "kernel/rcu/Kconfig.debug"                1385 source "kernel/rcu/Kconfig.debug"
1797                                                  1386 
1798 config DEBUG_WQ_FORCE_RR_CPU                     1387 config DEBUG_WQ_FORCE_RR_CPU
1799         bool "Force round-robin CPU selection    1388         bool "Force round-robin CPU selection for unbound work items"
1800         depends on DEBUG_KERNEL                  1389         depends on DEBUG_KERNEL
1801         default n                                1390         default n
1802         help                                     1391         help
1803           Workqueue used to implicitly guaran    1392           Workqueue used to implicitly guarantee that work items queued
1804           without explicit CPU specified are     1393           without explicit CPU specified are put on the local CPU.  This
1805           guarantee is no longer true and whi    1394           guarantee is no longer true and while local CPU is still
1806           preferred work items may be put on     1395           preferred work items may be put on foreign CPUs.  Kernel
1807           parameter "workqueue.debug_force_rr    1396           parameter "workqueue.debug_force_rr_cpu" is added to force
1808           round-robin CPU selection to flush     1397           round-robin CPU selection to flush out usages which depend on the
1809           now broken guarantee.  This config     1398           now broken guarantee.  This config option enables the debug
1810           feature by default.  When enabled,     1399           feature by default.  When enabled, memory and cache locality will
1811           be impacted.                           1400           be impacted.
1812                                                  1401 
                                                   >> 1402 config DEBUG_BLOCK_EXT_DEVT
                                                   >> 1403         bool "Force extended block device numbers and spread them"
                                                   >> 1404         depends on DEBUG_KERNEL
                                                   >> 1405         depends on BLOCK
                                                   >> 1406         default n
                                                   >> 1407         help
                                                   >> 1408           BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
                                                   >> 1409           SOME DISTRIBUTIONS.  DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
                                                   >> 1410           YOU ARE DOING.  Distros, please enable this and fix whatever
                                                   >> 1411           is broken.
                                                   >> 1412 
                                                   >> 1413           Conventionally, block device numbers are allocated from
                                                   >> 1414           predetermined contiguous area.  However, extended block area
                                                   >> 1415           may introduce non-contiguous block device numbers.  This
                                                   >> 1416           option forces most block device numbers to be allocated from
                                                   >> 1417           the extended space and spreads them to discover kernel or
                                                   >> 1418           userland code paths which assume predetermined contiguous
                                                   >> 1419           device number allocation.
                                                   >> 1420 
                                                   >> 1421           Note that turning on this debug option shuffles all the
                                                   >> 1422           device numbers for all IDE and SCSI devices including libata
                                                   >> 1423           ones, so root partition specified using device number
                                                   >> 1424           directly (via rdev or root=MAJ:MIN) won't work anymore.
                                                   >> 1425           Textual device names (root=/dev/sdXn) will continue to work.
                                                   >> 1426 
                                                   >> 1427           Say N if you are unsure.
                                                   >> 1428 
1813 config CPU_HOTPLUG_STATE_CONTROL                 1429 config CPU_HOTPLUG_STATE_CONTROL
1814         bool "Enable CPU hotplug state contro    1430         bool "Enable CPU hotplug state control"
1815         depends on DEBUG_KERNEL                  1431         depends on DEBUG_KERNEL
1816         depends on HOTPLUG_CPU                   1432         depends on HOTPLUG_CPU
1817         default n                                1433         default n
1818         help                                     1434         help
1819           Allows to write steps between "offl    1435           Allows to write steps between "offline" and "online" to the CPUs
1820           sysfs target file so states can be     1436           sysfs target file so states can be stepped granular. This is a debug
1821           option for now as the hotplug machi    1437           option for now as the hotplug machinery cannot be stopped and
1822           restarted at arbitrary points yet.     1438           restarted at arbitrary points yet.
1823                                                  1439 
1824           Say N if your are unsure.              1440           Say N if your are unsure.
1825                                                  1441 
1826 config LATENCYTOP                                1442 config LATENCYTOP
1827         bool "Latency measuring infrastructur    1443         bool "Latency measuring infrastructure"
1828         depends on DEBUG_KERNEL                  1444         depends on DEBUG_KERNEL
1829         depends on STACKTRACE_SUPPORT            1445         depends on STACKTRACE_SUPPORT
1830         depends on PROC_FS                       1446         depends on PROC_FS
1831         depends on FRAME_POINTER || MIPS || P !! 1447         select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
1832         select KALLSYMS                          1448         select KALLSYMS
1833         select KALLSYMS_ALL                      1449         select KALLSYMS_ALL
1834         select STACKTRACE                        1450         select STACKTRACE
1835         select SCHEDSTATS                        1451         select SCHEDSTATS
                                                   >> 1452         select SCHED_DEBUG
1836         help                                     1453         help
1837           Enable this option if you want to u    1454           Enable this option if you want to use the LatencyTOP tool
1838           to find out which userspace is bloc    1455           to find out which userspace is blocking on what kernel operations.
1839                                                  1456 
1840 config DEBUG_CGROUP_REF                       << 
1841         bool "Disable inlining of cgroup css  << 
1842         depends on DEBUG_KERNEL               << 
1843         depends on CGROUPS                    << 
1844         depends on KPROBES                    << 
1845         default n                             << 
1846         help                                  << 
1847           Force cgroup css reference count fu << 
1848           that they can be kprobed for debugg << 
1849                                               << 
1850 source "kernel/trace/Kconfig"                    1457 source "kernel/trace/Kconfig"
1851                                                  1458 
1852 config PROVIDE_OHCI1394_DMA_INIT                 1459 config PROVIDE_OHCI1394_DMA_INIT
1853         bool "Remote debugging over FireWire     1460         bool "Remote debugging over FireWire early on boot"
1854         depends on PCI && X86                    1461         depends on PCI && X86
1855         help                                     1462         help
1856           If you want to debug problems which    1463           If you want to debug problems which hang or crash the kernel early
1857           on boot and the crashing machine ha    1464           on boot and the crashing machine has a FireWire port, you can use
1858           this feature to remotely access the    1465           this feature to remotely access the memory of the crashed machine
1859           over FireWire. This employs remote     1466           over FireWire. This employs remote DMA as part of the OHCI1394
1860           specification which is now the stan    1467           specification which is now the standard for FireWire controllers.
1861                                                  1468 
1862           With remote DMA, you can monitor th    1469           With remote DMA, you can monitor the printk buffer remotely using
1863           firescope and access all memory bel    1470           firescope and access all memory below 4GB using fireproxy from gdb.
1864           Even controlling a kernel debugger     1471           Even controlling a kernel debugger is possible using remote DMA.
1865                                                  1472 
1866           Usage:                                 1473           Usage:
1867                                                  1474 
1868           If ohci1394_dma=early is used as bo    1475           If ohci1394_dma=early is used as boot parameter, it will initialize
1869           all OHCI1394 controllers which are     1476           all OHCI1394 controllers which are found in the PCI config space.
1870                                                  1477 
1871           As all changes to the FireWire bus     1478           As all changes to the FireWire bus such as enabling and disabling
1872           devices cause a bus reset and there    1479           devices cause a bus reset and thereby disable remote DMA for all
1873           devices, be sure to have the cable     1480           devices, be sure to have the cable plugged and FireWire enabled on
1874           the debugging host before booting t    1481           the debugging host before booting the debug target for debugging.
1875                                                  1482 
1876           This code (~1k) is freed after boot    1483           This code (~1k) is freed after boot. By then, the firewire stack
1877           in charge of the OHCI-1394 controll    1484           in charge of the OHCI-1394 controllers should be used instead.
1878                                                  1485 
1879           See Documentation/core-api/debuggin !! 1486           See Documentation/debugging-via-ohci1394.txt for more information.
1880                                                  1487 
1881 source "samples/Kconfig"                         1488 source "samples/Kconfig"
1882                                                  1489 
1883 config ARCH_HAS_DEVMEM_IS_ALLOWED                1490 config ARCH_HAS_DEVMEM_IS_ALLOWED
1884         bool                                     1491         bool
1885                                                  1492 
1886 config STRICT_DEVMEM                             1493 config STRICT_DEVMEM
1887         bool "Filter access to /dev/mem"         1494         bool "Filter access to /dev/mem"
1888         depends on MMU && DEVMEM                 1495         depends on MMU && DEVMEM
1889         depends on ARCH_HAS_DEVMEM_IS_ALLOWED !! 1496         depends on ARCH_HAS_DEVMEM_IS_ALLOWED
1890         default y if PPC || X86 || ARM64         1497         default y if PPC || X86 || ARM64
1891         help                                     1498         help
1892           If this option is disabled, you all    1499           If this option is disabled, you allow userspace (root) access to all
1893           of memory, including kernel and use    1500           of memory, including kernel and userspace memory. Accidental
1894           access to this is obviously disastr    1501           access to this is obviously disastrous, but specific access can
1895           be used by people debugging the ker    1502           be used by people debugging the kernel. Note that with PAT support
1896           enabled, even in this case there ar    1503           enabled, even in this case there are restrictions on /dev/mem
1897           use due to the cache aliasing requi    1504           use due to the cache aliasing requirements.
1898                                                  1505 
1899           If this option is switched on, and     1506           If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
1900           file only allows userspace access t    1507           file only allows userspace access to PCI space and the BIOS code and
1901           data regions.  This is sufficient f    1508           data regions.  This is sufficient for dosemu and X and all common
1902           users of /dev/mem.                     1509           users of /dev/mem.
1903                                                  1510 
1904           If in doubt, say Y.                    1511           If in doubt, say Y.
1905                                                  1512 
1906 config IO_STRICT_DEVMEM                          1513 config IO_STRICT_DEVMEM
1907         bool "Filter I/O access to /dev/mem"     1514         bool "Filter I/O access to /dev/mem"
1908         depends on STRICT_DEVMEM                 1515         depends on STRICT_DEVMEM
1909         help                                     1516         help
1910           If this option is disabled, you all    1517           If this option is disabled, you allow userspace (root) access to all
1911           io-memory regardless of whether a d    1518           io-memory regardless of whether a driver is actively using that
1912           range.  Accidental access to this i    1519           range.  Accidental access to this is obviously disastrous, but
1913           specific access can be used by peop    1520           specific access can be used by people debugging kernel drivers.
1914                                                  1521 
1915           If this option is switched on, the     1522           If this option is switched on, the /dev/mem file only allows
1916           userspace access to *idle* io-memor    1523           userspace access to *idle* io-memory ranges (see /proc/iomem) This
1917           may break traditional users of /dev    1524           may break traditional users of /dev/mem (dosemu, legacy X, etc...)
1918           if the driver using a given range c    1525           if the driver using a given range cannot be disabled.
1919                                                  1526 
1920           If in doubt, say Y.                    1527           If in doubt, say Y.
1921                                                  1528 
1922 menu "$(SRCARCH) Debugging"                      1529 menu "$(SRCARCH) Debugging"
1923                                                  1530 
1924 source "arch/$(SRCARCH)/Kconfig.debug"           1531 source "arch/$(SRCARCH)/Kconfig.debug"
1925                                                  1532 
1926 endmenu                                          1533 endmenu
1927                                                  1534 
1928 menu "Kernel Testing and Coverage"               1535 menu "Kernel Testing and Coverage"
1929                                                  1536 
1930 source "lib/kunit/Kconfig"                       1537 source "lib/kunit/Kconfig"
1931                                                  1538 
1932 config NOTIFIER_ERROR_INJECTION                  1539 config NOTIFIER_ERROR_INJECTION
1933         tristate "Notifier error injection"      1540         tristate "Notifier error injection"
1934         depends on DEBUG_KERNEL                  1541         depends on DEBUG_KERNEL
1935         select DEBUG_FS                          1542         select DEBUG_FS
1936         help                                     1543         help
1937           This option provides the ability to    1544           This option provides the ability to inject artificial errors to
1938           specified notifier chain callbacks.    1545           specified notifier chain callbacks. It is useful to test the error
1939           handling of notifier call chain fai    1546           handling of notifier call chain failures.
1940                                                  1547 
1941           Say N if unsure.                       1548           Say N if unsure.
1942                                                  1549 
1943 config PM_NOTIFIER_ERROR_INJECT                  1550 config PM_NOTIFIER_ERROR_INJECT
1944         tristate "PM notifier error injection    1551         tristate "PM notifier error injection module"
1945         depends on PM && NOTIFIER_ERROR_INJEC    1552         depends on PM && NOTIFIER_ERROR_INJECTION
1946         default m if PM_DEBUG                    1553         default m if PM_DEBUG
1947         help                                     1554         help
1948           This option provides the ability to    1555           This option provides the ability to inject artificial errors to
1949           PM notifier chain callbacks.  It is    1556           PM notifier chain callbacks.  It is controlled through debugfs
1950           interface /sys/kernel/debug/notifie    1557           interface /sys/kernel/debug/notifier-error-inject/pm
1951                                                  1558 
1952           If the notifier call chain should b    1559           If the notifier call chain should be failed with some events
1953           notified, write the error code to "    1560           notified, write the error code to "actions/<notifier event>/error".
1954                                                  1561 
1955           Example: Inject PM suspend error (-    1562           Example: Inject PM suspend error (-12 = -ENOMEM)
1956                                                  1563 
1957           # cd /sys/kernel/debug/notifier-err    1564           # cd /sys/kernel/debug/notifier-error-inject/pm/
1958           # echo -12 > actions/PM_SUSPEND_PRE    1565           # echo -12 > actions/PM_SUSPEND_PREPARE/error
1959           # echo mem > /sys/power/state          1566           # echo mem > /sys/power/state
1960           bash: echo: write error: Cannot all    1567           bash: echo: write error: Cannot allocate memory
1961                                                  1568 
1962           To compile this code as a module, c    1569           To compile this code as a module, choose M here: the module will
1963           be called pm-notifier-error-inject.    1570           be called pm-notifier-error-inject.
1964                                                  1571 
1965           If unsure, say N.                      1572           If unsure, say N.
1966                                                  1573 
1967 config OF_RECONFIG_NOTIFIER_ERROR_INJECT         1574 config OF_RECONFIG_NOTIFIER_ERROR_INJECT
1968         tristate "OF reconfig notifier error     1575         tristate "OF reconfig notifier error injection module"
1969         depends on OF_DYNAMIC && NOTIFIER_ERR    1576         depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
1970         help                                     1577         help
1971           This option provides the ability to    1578           This option provides the ability to inject artificial errors to
1972           OF reconfig notifier chain callback    1579           OF reconfig notifier chain callbacks.  It is controlled
1973           through debugfs interface under        1580           through debugfs interface under
1974           /sys/kernel/debug/notifier-error-in    1581           /sys/kernel/debug/notifier-error-inject/OF-reconfig/
1975                                                  1582 
1976           If the notifier call chain should b    1583           If the notifier call chain should be failed with some events
1977           notified, write the error code to "    1584           notified, write the error code to "actions/<notifier event>/error".
1978                                                  1585 
1979           To compile this code as a module, c    1586           To compile this code as a module, choose M here: the module will
1980           be called of-reconfig-notifier-erro    1587           be called of-reconfig-notifier-error-inject.
1981                                                  1588 
1982           If unsure, say N.                      1589           If unsure, say N.
1983                                                  1590 
1984 config NETDEV_NOTIFIER_ERROR_INJECT              1591 config NETDEV_NOTIFIER_ERROR_INJECT
1985         tristate "Netdev notifier error injec    1592         tristate "Netdev notifier error injection module"
1986         depends on NET && NOTIFIER_ERROR_INJE    1593         depends on NET && NOTIFIER_ERROR_INJECTION
1987         help                                     1594         help
1988           This option provides the ability to    1595           This option provides the ability to inject artificial errors to
1989           netdevice notifier chain callbacks.    1596           netdevice notifier chain callbacks.  It is controlled through debugfs
1990           interface /sys/kernel/debug/notifie    1597           interface /sys/kernel/debug/notifier-error-inject/netdev
1991                                                  1598 
1992           If the notifier call chain should b    1599           If the notifier call chain should be failed with some events
1993           notified, write the error code to "    1600           notified, write the error code to "actions/<notifier event>/error".
1994                                                  1601 
1995           Example: Inject netdevice mtu chang    1602           Example: Inject netdevice mtu change error (-22 = -EINVAL)
1996                                                  1603 
1997           # cd /sys/kernel/debug/notifier-err    1604           # cd /sys/kernel/debug/notifier-error-inject/netdev
1998           # echo -22 > actions/NETDEV_CHANGEM    1605           # echo -22 > actions/NETDEV_CHANGEMTU/error
1999           # ip link set eth0 mtu 1024            1606           # ip link set eth0 mtu 1024
2000           RTNETLINK answers: Invalid argument    1607           RTNETLINK answers: Invalid argument
2001                                                  1608 
2002           To compile this code as a module, c    1609           To compile this code as a module, choose M here: the module will
2003           be called netdev-notifier-error-inj    1610           be called netdev-notifier-error-inject.
2004                                                  1611 
2005           If unsure, say N.                      1612           If unsure, say N.
2006                                                  1613 
2007 config FUNCTION_ERROR_INJECTION                  1614 config FUNCTION_ERROR_INJECTION
2008         bool "Fault-injections of functions"  !! 1615         def_bool y
2009         depends on HAVE_FUNCTION_ERROR_INJECT    1616         depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
2010         help                                  << 
2011           Add fault injections into various f << 
2012           ALLOW_ERROR_INJECTION() in the kern << 
2013           value of these functions. This is u << 
2014                                               << 
2015           If unsure, say N                    << 
2016                                                  1617 
2017 config FAULT_INJECTION                           1618 config FAULT_INJECTION
2018         bool "Fault-injection framework"         1619         bool "Fault-injection framework"
2019         depends on DEBUG_KERNEL                  1620         depends on DEBUG_KERNEL
2020         help                                     1621         help
2021           Provide fault-injection framework.     1622           Provide fault-injection framework.
2022           For more details, see Documentation    1623           For more details, see Documentation/fault-injection/.
2023                                                  1624 
2024 config FAILSLAB                                  1625 config FAILSLAB
2025         bool "Fault-injection capability for     1626         bool "Fault-injection capability for kmalloc"
2026         depends on FAULT_INJECTION               1627         depends on FAULT_INJECTION
                                                   >> 1628         depends on SLAB || SLUB
2027         help                                     1629         help
2028           Provide fault-injection capability     1630           Provide fault-injection capability for kmalloc.
2029                                                  1631 
2030 config FAIL_PAGE_ALLOC                           1632 config FAIL_PAGE_ALLOC
2031         bool "Fault-injection capability for  !! 1633         bool "Fault-injection capabilitiy for alloc_pages()"
2032         depends on FAULT_INJECTION               1634         depends on FAULT_INJECTION
2033         help                                     1635         help
2034           Provide fault-injection capability     1636           Provide fault-injection capability for alloc_pages().
2035                                                  1637 
2036 config FAULT_INJECTION_USERCOPY               << 
2037         bool "Fault injection capability for  << 
2038         depends on FAULT_INJECTION            << 
2039         help                                  << 
2040           Provides fault-injection capability << 
2041           in usercopy functions (copy_from_us << 
2042                                               << 
2043 config FAIL_MAKE_REQUEST                         1638 config FAIL_MAKE_REQUEST
2044         bool "Fault-injection capability for     1639         bool "Fault-injection capability for disk IO"
2045         depends on FAULT_INJECTION && BLOCK      1640         depends on FAULT_INJECTION && BLOCK
2046         help                                     1641         help
2047           Provide fault-injection capability     1642           Provide fault-injection capability for disk IO.
2048                                                  1643 
2049 config FAIL_IO_TIMEOUT                           1644 config FAIL_IO_TIMEOUT
2050         bool "Fault-injection capability for     1645         bool "Fault-injection capability for faking disk interrupts"
2051         depends on FAULT_INJECTION && BLOCK      1646         depends on FAULT_INJECTION && BLOCK
2052         help                                     1647         help
2053           Provide fault-injection capability     1648           Provide fault-injection capability on end IO handling. This
2054           will make the block layer "forget"     1649           will make the block layer "forget" an interrupt as configured,
2055           thus exercising the error handling.    1650           thus exercising the error handling.
2056                                                  1651 
2057           Only works with drivers that use th    1652           Only works with drivers that use the generic timeout handling,
2058           for others it won't do anything.    !! 1653           for others it wont do anything.
2059                                                  1654 
2060 config FAIL_FUTEX                                1655 config FAIL_FUTEX
2061         bool "Fault-injection capability for     1656         bool "Fault-injection capability for futexes"
2062         select DEBUG_FS                          1657         select DEBUG_FS
2063         depends on FAULT_INJECTION && FUTEX      1658         depends on FAULT_INJECTION && FUTEX
2064         help                                     1659         help
2065           Provide fault-injection capability     1660           Provide fault-injection capability for futexes.
2066                                                  1661 
2067 config FAULT_INJECTION_DEBUG_FS                  1662 config FAULT_INJECTION_DEBUG_FS
2068         bool "Debugfs entries for fault-injec    1663         bool "Debugfs entries for fault-injection capabilities"
2069         depends on FAULT_INJECTION && SYSFS &    1664         depends on FAULT_INJECTION && SYSFS && DEBUG_FS
2070         help                                     1665         help
2071           Enable configuration of fault-injec    1666           Enable configuration of fault-injection capabilities via debugfs.
2072                                                  1667 
2073 config FAIL_FUNCTION                             1668 config FAIL_FUNCTION
2074         bool "Fault-injection capability for     1669         bool "Fault-injection capability for functions"
2075         depends on FAULT_INJECTION_DEBUG_FS &    1670         depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
2076         help                                     1671         help
2077           Provide function-based fault-inject    1672           Provide function-based fault-injection capability.
2078           This will allow you to override a s    1673           This will allow you to override a specific function with a return
2079           with given return value. As a resul    1674           with given return value. As a result, function caller will see
2080           an error value and have to handle i    1675           an error value and have to handle it. This is useful to test the
2081           error handling in various subsystem    1676           error handling in various subsystems.
2082                                                  1677 
2083 config FAIL_MMC_REQUEST                          1678 config FAIL_MMC_REQUEST
2084         bool "Fault-injection capability for     1679         bool "Fault-injection capability for MMC IO"
2085         depends on FAULT_INJECTION_DEBUG_FS &    1680         depends on FAULT_INJECTION_DEBUG_FS && MMC
2086         help                                     1681         help
2087           Provide fault-injection capability     1682           Provide fault-injection capability for MMC IO.
2088           This will make the mmc core return     1683           This will make the mmc core return data errors. This is
2089           useful to test the error handling i    1684           useful to test the error handling in the mmc block device
2090           and to test how the mmc host driver    1685           and to test how the mmc host driver handles retries from
2091           the block device.                      1686           the block device.
2092                                                  1687 
2093 config FAIL_SUNRPC                            << 
2094         bool "Fault-injection capability for  << 
2095         depends on FAULT_INJECTION_DEBUG_FS & << 
2096         help                                  << 
2097           Provide fault-injection capability  << 
2098           its consumers.                      << 
2099                                               << 
2100 config FAULT_INJECTION_CONFIGFS               << 
2101         bool "Configfs interface for fault-in << 
2102         depends on FAULT_INJECTION            << 
2103         select CONFIGFS_FS                    << 
2104         help                                  << 
2105           This option allows configfs-based d << 
2106           fault-injection via configfs.  Each << 
2107           fault-injection can be made visible << 
2108           configfs group.                     << 
2109                                               << 
2110                                               << 
2111 config FAULT_INJECTION_STACKTRACE_FILTER         1688 config FAULT_INJECTION_STACKTRACE_FILTER
2112         bool "stacktrace filter for fault-inj    1689         bool "stacktrace filter for fault-injection capabilities"
2113         depends on FAULT_INJECTION            !! 1690         depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
2114         depends on (FAULT_INJECTION_DEBUG_FS  !! 1691         depends on !X86_64
2115         select STACKTRACE                        1692         select STACKTRACE
2116         depends on FRAME_POINTER || MIPS || P !! 1693         select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
2117         help                                     1694         help
2118           Provide stacktrace filter for fault    1695           Provide stacktrace filter for fault-injection capabilities
2119                                                  1696 
2120 config ARCH_HAS_KCOV                             1697 config ARCH_HAS_KCOV
2121         bool                                     1698         bool
2122         help                                     1699         help
2123           An architecture should select this     1700           An architecture should select this when it can successfully
2124           build and run with CONFIG_KCOV. Thi    1701           build and run with CONFIG_KCOV. This typically requires
2125           disabling instrumentation for some     1702           disabling instrumentation for some early boot code.
2126                                                  1703 
2127 config CC_HAS_SANCOV_TRACE_PC                    1704 config CC_HAS_SANCOV_TRACE_PC
2128         def_bool $(cc-option,-fsanitize-cover    1705         def_bool $(cc-option,-fsanitize-coverage=trace-pc)
2129                                                  1706 
2130                                                  1707 
2131 config KCOV                                      1708 config KCOV
2132         bool "Code coverage for fuzzing"         1709         bool "Code coverage for fuzzing"
2133         depends on ARCH_HAS_KCOV                 1710         depends on ARCH_HAS_KCOV
2134         depends on CC_HAS_SANCOV_TRACE_PC ||     1711         depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
2135         depends on !ARCH_WANTS_NO_INSTR || HA << 
2136                    GCC_VERSION >= 120000 || C << 
2137         select DEBUG_FS                          1712         select DEBUG_FS
2138         select GCC_PLUGIN_SANCOV if !CC_HAS_S    1713         select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
2139         select OBJTOOL if HAVE_NOINSTR_HACK   << 
2140         help                                     1714         help
2141           KCOV exposes kernel code coverage i    1715           KCOV exposes kernel code coverage information in a form suitable
2142           for coverage-guided fuzzing (random    1716           for coverage-guided fuzzing (randomized testing).
2143                                                  1717 
                                                   >> 1718           If RANDOMIZE_BASE is enabled, PC values will not be stable across
                                                   >> 1719           different machines and across reboots. If you need stable PC values,
                                                   >> 1720           disable RANDOMIZE_BASE.
                                                   >> 1721 
2144           For more details, see Documentation    1722           For more details, see Documentation/dev-tools/kcov.rst.
2145                                                  1723 
2146 config KCOV_ENABLE_COMPARISONS                   1724 config KCOV_ENABLE_COMPARISONS
2147         bool "Enable comparison operands coll    1725         bool "Enable comparison operands collection by KCOV"
2148         depends on KCOV                          1726         depends on KCOV
2149         depends on $(cc-option,-fsanitize-cov    1727         depends on $(cc-option,-fsanitize-coverage=trace-cmp)
2150         help                                     1728         help
2151           KCOV also exposes operands of every    1729           KCOV also exposes operands of every comparison in the instrumented
2152           code along with operand sizes and P    1730           code along with operand sizes and PCs of the comparison instructions.
2153           These operands can be used by fuzzi    1731           These operands can be used by fuzzing engines to improve the quality
2154           of fuzzing coverage.                   1732           of fuzzing coverage.
2155                                                  1733 
2156 config KCOV_INSTRUMENT_ALL                       1734 config KCOV_INSTRUMENT_ALL
2157         bool "Instrument all code by default"    1735         bool "Instrument all code by default"
2158         depends on KCOV                          1736         depends on KCOV
2159         default y                                1737         default y
2160         help                                     1738         help
2161           If you are doing generic system cal    1739           If you are doing generic system call fuzzing (like e.g. syzkaller),
2162           then you will want to instrument th    1740           then you will want to instrument the whole kernel and you should
2163           say y here. If you are doing more t    1741           say y here. If you are doing more targeted fuzzing (like e.g.
2164           filesystem fuzzing with AFL) then y    1742           filesystem fuzzing with AFL) then you will want to enable coverage
2165           for more specific subsets of files,    1743           for more specific subsets of files, and should say n here.
2166                                                  1744 
2167 config KCOV_IRQ_AREA_SIZE                     << 
2168         hex "Size of interrupt coverage colle << 
2169         depends on KCOV                       << 
2170         default 0x40000                       << 
2171         help                                  << 
2172           KCOV uses preallocated per-cpu area << 
2173           soft interrupts. This specifies the << 
2174           number of unsigned long words.      << 
2175                                               << 
2176 menuconfig RUNTIME_TESTING_MENU                  1745 menuconfig RUNTIME_TESTING_MENU
2177         bool "Runtime Testing"                   1746         bool "Runtime Testing"
2178         default y                             !! 1747         def_bool y
2179                                                  1748 
2180 if RUNTIME_TESTING_MENU                          1749 if RUNTIME_TESTING_MENU
2181                                                  1750 
2182 config TEST_DHRY                              << 
2183         tristate "Dhrystone benchmark test"   << 
2184         help                                  << 
2185           Enable this to include the Dhryston << 
2186           calculates the number of Dhrystones << 
2187           DMIPS (Dhrystone MIPS) obtained whe << 
2188           by 1757 (the number of Dhrystones p << 
2189           11/780, nominally a 1 MIPS machine) << 
2190                                               << 
2191           To run the benchmark, it needs to b << 
2192           the kernel command line (when built << 
2193           built-in or modular).               << 
2194                                               << 
2195           Run once during kernel boot:        << 
2196                                               << 
2197               test_dhry.run                   << 
2198                                               << 
2199           Set number of iterations from kerne << 
2200                                               << 
2201               test_dhry.iterations=<n>        << 
2202                                               << 
2203           Set number of iterations from users << 
2204                                               << 
2205               echo <n> > /sys/module/test_dhr << 
2206                                               << 
2207           Trigger manual run from userspace:  << 
2208                                               << 
2209               echo y > /sys/module/test_dhry/ << 
2210                                               << 
2211           If the number of iterations is <= 0 << 
2212           number of iterations (test runs for << 
2213           This process takes ca. 4s.          << 
2214                                               << 
2215           If unsure, say N.                   << 
2216                                               << 
2217 config LKDTM                                     1751 config LKDTM
2218         tristate "Linux Kernel Dump Test Tool    1752         tristate "Linux Kernel Dump Test Tool Module"
2219         depends on DEBUG_FS                      1753         depends on DEBUG_FS
2220         help                                     1754         help
2221         This module enables testing of the di    1755         This module enables testing of the different dumping mechanisms by
2222         inducing system failures at predefine    1756         inducing system failures at predefined crash points.
2223         If you don't need it: say N              1757         If you don't need it: say N
2224         Choose M here to compile this code as    1758         Choose M here to compile this code as a module. The module will be
2225         called lkdtm.                            1759         called lkdtm.
2226                                                  1760 
2227         Documentation on how to use the modul    1761         Documentation on how to use the module can be found in
2228         Documentation/fault-injection/provoke    1762         Documentation/fault-injection/provoke-crashes.rst
2229                                                  1763 
2230 config CPUMASK_KUNIT_TEST                     << 
2231         tristate "KUnit test for cpumask" if  << 
2232         depends on KUNIT                      << 
2233         default KUNIT_ALL_TESTS               << 
2234         help                                  << 
2235           Enable to turn on cpumask tests, ru << 
2236                                               << 
2237           For more information on KUnit and u << 
2238           to the KUnit documentation in Docum << 
2239                                               << 
2240           If unsure, say N.                   << 
2241                                               << 
2242 config TEST_LIST_SORT                            1764 config TEST_LIST_SORT
2243         tristate "Linked list sorting test" i !! 1765         tristate "Linked list sorting test"
2244         depends on KUNIT                      << 
2245         default KUNIT_ALL_TESTS               << 
2246         help                                  << 
2247           Enable this to turn on 'list_sort() << 
2248           executed only once during system bo << 
2249           or at module load time.             << 
2250                                               << 
2251           If unsure, say N.                   << 
2252                                               << 
2253 config TEST_MIN_HEAP                          << 
2254         tristate "Min heap test"              << 
2255         depends on DEBUG_KERNEL || m             1766         depends on DEBUG_KERNEL || m
2256         help                                     1767         help
2257           Enable this to turn on min heap fun !! 1768           Enable this to turn on 'list_sort()' function test. This test is
2258           executed only once during system bo    1769           executed only once during system boot (so affects only boot time),
2259           or at module load time.                1770           or at module load time.
2260                                                  1771 
2261           If unsure, say N.                      1772           If unsure, say N.
2262                                                  1773 
2263 config TEST_SORT                                 1774 config TEST_SORT
2264         tristate "Array-based sort test" if ! !! 1775         tristate "Array-based sort test"
2265         depends on KUNIT                      << 
2266         default KUNIT_ALL_TESTS               << 
2267         help                                  << 
2268           This option enables the self-test f << 
2269           or at module load time.             << 
2270                                               << 
2271           If unsure, say N.                   << 
2272                                               << 
2273 config TEST_DIV64                             << 
2274         tristate "64bit/32bit division and mo << 
2275         depends on DEBUG_KERNEL || m             1776         depends on DEBUG_KERNEL || m
2276         help                                     1777         help
2277           Enable this to turn on 'do_div()' f !! 1778           This option enables the self-test function of 'sort()' at boot,
2278           executed only once during system bo << 
2279           or at module load time.                1779           or at module load time.
2280                                                  1780 
2281           If unsure, say N.                      1781           If unsure, say N.
2282                                                  1782 
2283 config TEST_IOV_ITER                          << 
2284         tristate "Test iov_iter operation" if << 
2285         depends on KUNIT                      << 
2286         depends on MMU                        << 
2287         default KUNIT_ALL_TESTS               << 
2288         help                                  << 
2289           Enable this to turn on testing of t << 
2290           (iov_iter). This test is executed o << 
2291           affects only boot time), or at modu << 
2292                                               << 
2293           If unsure, say N.                   << 
2294                                               << 
2295 config KPROBES_SANITY_TEST                       1783 config KPROBES_SANITY_TEST
2296         tristate "Kprobes sanity tests" if !K !! 1784         bool "Kprobes sanity tests"
2297         depends on DEBUG_KERNEL                  1785         depends on DEBUG_KERNEL
2298         depends on KPROBES                       1786         depends on KPROBES
2299         depends on KUNIT                      << 
2300         select STACKTRACE if ARCH_CORRECT_STA << 
2301         default KUNIT_ALL_TESTS               << 
2302         help                                     1787         help
2303           This option provides for testing ba    1788           This option provides for testing basic kprobes functionality on
2304           boot. Samples of kprobe and kretpro    1789           boot. Samples of kprobe and kretprobe are inserted and
2305           verified for functionality.            1790           verified for functionality.
2306                                                  1791 
2307           Say N if you are unsure.               1792           Say N if you are unsure.
2308                                                  1793 
2309 config FPROBE_SANITY_TEST                     << 
2310         bool "Self test for fprobe"           << 
2311         depends on DEBUG_KERNEL               << 
2312         depends on FPROBE                     << 
2313         depends on KUNIT=y                    << 
2314         help                                  << 
2315           This option will enable testing the << 
2316           A series of tests are made to verif << 
2317           properly.                           << 
2318                                               << 
2319           Say N if you are unsure.            << 
2320                                               << 
2321 config BACKTRACE_SELF_TEST                       1794 config BACKTRACE_SELF_TEST
2322         tristate "Self test for the backtrace    1795         tristate "Self test for the backtrace code"
2323         depends on DEBUG_KERNEL                  1796         depends on DEBUG_KERNEL
2324         help                                     1797         help
2325           This option provides a kernel modul    1798           This option provides a kernel module that can be used to test
2326           the kernel stack backtrace code. Th    1799           the kernel stack backtrace code. This option is not useful
2327           for distributions or general kernel    1800           for distributions or general kernels, but only for kernel
2328           developers working on architecture     1801           developers working on architecture code.
2329                                                  1802 
2330           Note that if you want to also test     1803           Note that if you want to also test saved backtraces, you will
2331           have to enable STACKTRACE as well.     1804           have to enable STACKTRACE as well.
2332                                                  1805 
2333           Say N if you are unsure.               1806           Say N if you are unsure.
2334                                                  1807 
2335 config TEST_REF_TRACKER                       << 
2336         tristate "Self test for reference tra << 
2337         depends on DEBUG_KERNEL && STACKTRACE << 
2338         select REF_TRACKER                    << 
2339         help                                  << 
2340           This option provides a kernel modul << 
2341           using reference tracker infrastruct << 
2342                                               << 
2343           Say N if you are unsure.            << 
2344                                               << 
2345 config RBTREE_TEST                               1808 config RBTREE_TEST
2346         tristate "Red-Black tree test"           1809         tristate "Red-Black tree test"
2347         depends on DEBUG_KERNEL                  1810         depends on DEBUG_KERNEL
2348         help                                     1811         help
2349           A benchmark measuring the performan    1812           A benchmark measuring the performance of the rbtree library.
2350           Also includes rbtree invariant chec    1813           Also includes rbtree invariant checks.
2351                                                  1814 
2352 config REED_SOLOMON_TEST                         1815 config REED_SOLOMON_TEST
2353         tristate "Reed-Solomon library test"     1816         tristate "Reed-Solomon library test"
2354         depends on DEBUG_KERNEL || m             1817         depends on DEBUG_KERNEL || m
2355         select REED_SOLOMON                      1818         select REED_SOLOMON
2356         select REED_SOLOMON_ENC16                1819         select REED_SOLOMON_ENC16
2357         select REED_SOLOMON_DEC16                1820         select REED_SOLOMON_DEC16
2358         help                                     1821         help
2359           This option enables the self-test f    1822           This option enables the self-test function of rslib at boot,
2360           or at module load time.                1823           or at module load time.
2361                                                  1824 
2362           If unsure, say N.                      1825           If unsure, say N.
2363                                                  1826 
2364 config INTERVAL_TREE_TEST                        1827 config INTERVAL_TREE_TEST
2365         tristate "Interval tree test"            1828         tristate "Interval tree test"
2366         depends on DEBUG_KERNEL                  1829         depends on DEBUG_KERNEL
2367         select INTERVAL_TREE                     1830         select INTERVAL_TREE
2368         help                                     1831         help
2369           A benchmark measuring the performan    1832           A benchmark measuring the performance of the interval tree library
2370                                                  1833 
2371 config PERCPU_TEST                               1834 config PERCPU_TEST
2372         tristate "Per cpu operations test"       1835         tristate "Per cpu operations test"
2373         depends on m && DEBUG_KERNEL             1836         depends on m && DEBUG_KERNEL
2374         help                                     1837         help
2375           Enable this option to build test mo    1838           Enable this option to build test module which validates per-cpu
2376           operations.                            1839           operations.
2377                                                  1840 
2378           If unsure, say N.                      1841           If unsure, say N.
2379                                                  1842 
2380 config ATOMIC64_SELFTEST                         1843 config ATOMIC64_SELFTEST
2381         tristate "Perform an atomic64_t self-    1844         tristate "Perform an atomic64_t self-test"
2382         help                                     1845         help
2383           Enable this option to test the atom    1846           Enable this option to test the atomic64_t functions at boot or
2384           at module load time.                   1847           at module load time.
2385                                                  1848 
2386           If unsure, say N.                      1849           If unsure, say N.
2387                                                  1850 
2388 config ASYNC_RAID6_TEST                          1851 config ASYNC_RAID6_TEST
2389         tristate "Self test for hardware acce    1852         tristate "Self test for hardware accelerated raid6 recovery"
2390         depends on ASYNC_RAID6_RECOV             1853         depends on ASYNC_RAID6_RECOV
2391         select ASYNC_MEMCPY                      1854         select ASYNC_MEMCPY
2392         help                                  !! 1855         ---help---
2393           This is a one-shot self test that p    1856           This is a one-shot self test that permutes through the
2394           recovery of all the possible two di    1857           recovery of all the possible two disk failure scenarios for a
2395           N-disk array.  Recovery is performe    1858           N-disk array.  Recovery is performed with the asynchronous
2396           raid6 recovery routines, and will o    1859           raid6 recovery routines, and will optionally use an offload
2397           engine if one is available.            1860           engine if one is available.
2398                                                  1861 
2399           If unsure, say N.                      1862           If unsure, say N.
2400                                                  1863 
2401 config TEST_HEXDUMP                              1864 config TEST_HEXDUMP
2402         tristate "Test functions located in t    1865         tristate "Test functions located in the hexdump module at runtime"
2403                                                  1866 
2404 config STRING_KUNIT_TEST                      !! 1867 config TEST_STRING_HELPERS
2405         tristate "KUnit test string functions !! 1868         tristate "Test functions located in the string_helpers module at runtime"
2406         depends on KUNIT                      << 
2407         default KUNIT_ALL_TESTS               << 
2408                                                  1869 
2409 config STRING_HELPERS_KUNIT_TEST              !! 1870 config TEST_STRSCPY
2410         tristate "KUnit test string helpers a !! 1871         tristate "Test strscpy*() family of functions at runtime"
2411         depends on KUNIT                      << 
2412         default KUNIT_ALL_TESTS               << 
2413                                                  1872 
2414 config TEST_KSTRTOX                              1873 config TEST_KSTRTOX
2415         tristate "Test kstrto*() family of fu    1874         tristate "Test kstrto*() family of functions at runtime"
2416                                                  1875 
2417 config TEST_PRINTF                               1876 config TEST_PRINTF
2418         tristate "Test printf() family of fun    1877         tristate "Test printf() family of functions at runtime"
2419                                                  1878 
2420 config TEST_SCANF                             << 
2421         tristate "Test scanf() family of func << 
2422                                               << 
2423 config TEST_BITMAP                               1879 config TEST_BITMAP
2424         tristate "Test bitmap_*() family of f    1880         tristate "Test bitmap_*() family of functions at runtime"
2425         help                                     1881         help
2426           Enable this option to test the bitm    1882           Enable this option to test the bitmap functions at boot.
2427                                                  1883 
2428           If unsure, say N.                      1884           If unsure, say N.
2429                                                  1885 
                                                   >> 1886 config TEST_BITFIELD
                                                   >> 1887         tristate "Test bitfield functions at runtime"
                                                   >> 1888         help
                                                   >> 1889           Enable this option to test the bitfield functions at boot.
                                                   >> 1890 
                                                   >> 1891           If unsure, say N.
                                                   >> 1892 
2430 config TEST_UUID                                 1893 config TEST_UUID
2431         tristate "Test functions located in t    1894         tristate "Test functions located in the uuid module at runtime"
2432                                                  1895 
2433 config TEST_XARRAY                               1896 config TEST_XARRAY
2434         tristate "Test the XArray code at run    1897         tristate "Test the XArray code at runtime"
2435                                                  1898 
2436 config TEST_MAPLE_TREE                        !! 1899 config TEST_OVERFLOW
2437         tristate "Test the Maple Tree code at !! 1900         tristate "Test check_*_overflow() functions at runtime"
2438         help                                  << 
2439           Enable this option to test the mapl << 
2440           when the module is loaded. Enable " << 
2441           more verbose output on failures.    << 
2442                                               << 
2443           If unsure, say N.                   << 
2444                                                  1901 
2445 config TEST_RHASHTABLE                           1902 config TEST_RHASHTABLE
2446         tristate "Perform selftest on resizab    1903         tristate "Perform selftest on resizable hash table"
2447         help                                     1904         help
2448           Enable this option to test the rhas    1905           Enable this option to test the rhashtable functions at boot.
2449                                                  1906 
2450           If unsure, say N.                      1907           If unsure, say N.
2451                                                  1908 
                                                   >> 1909 config TEST_HASH
                                                   >> 1910         tristate "Perform selftest on hash functions"
                                                   >> 1911         help
                                                   >> 1912           Enable this option to test the kernel's integer (<linux/hash.h>),
                                                   >> 1913           string (<linux/stringhash.h>), and siphash (<linux/siphash.h>)
                                                   >> 1914           hash functions on boot (or module load).
                                                   >> 1915 
                                                   >> 1916           This is intended to help people writing architecture-specific
                                                   >> 1917           optimized versions.  If unsure, say N.
                                                   >> 1918 
2452 config TEST_IDA                                  1919 config TEST_IDA
2453         tristate "Perform selftest on IDA fun    1920         tristate "Perform selftest on IDA functions"
2454                                                  1921 
2455 config TEST_PARMAN                               1922 config TEST_PARMAN
2456         tristate "Perform selftest on priorit    1923         tristate "Perform selftest on priority array manager"
2457         depends on PARMAN                        1924         depends on PARMAN
2458         help                                     1925         help
2459           Enable this option to test priority    1926           Enable this option to test priority array manager on boot
2460           (or module load).                      1927           (or module load).
2461                                                  1928 
2462           If unsure, say N.                      1929           If unsure, say N.
2463                                                  1930 
2464 config TEST_IRQ_TIMINGS                          1931 config TEST_IRQ_TIMINGS
2465         bool "IRQ timings selftest"              1932         bool "IRQ timings selftest"
2466         depends on IRQ_TIMINGS                   1933         depends on IRQ_TIMINGS
2467         help                                     1934         help
2468           Enable this option to test the irq     1935           Enable this option to test the irq timings code on boot.
2469                                                  1936 
2470           If unsure, say N.                      1937           If unsure, say N.
2471                                                  1938 
2472 config TEST_LKM                                  1939 config TEST_LKM
2473         tristate "Test module loading with 'h    1940         tristate "Test module loading with 'hello world' module"
2474         depends on m                             1941         depends on m
2475         help                                     1942         help
2476           This builds the "test_module" modul    1943           This builds the "test_module" module that emits "Hello, world"
2477           on printk when loaded. It is design    1944           on printk when loaded. It is designed to be used for basic
2478           evaluation of the module loading su    1945           evaluation of the module loading subsystem (for example when
2479           validating module verification). It    1946           validating module verification). It lacks any extra dependencies,
2480           and will not normally be loaded by     1947           and will not normally be loaded by the system unless explicitly
2481           requested by name.                     1948           requested by name.
2482                                                  1949 
2483           If unsure, say N.                      1950           If unsure, say N.
2484                                                  1951 
2485 config TEST_BITOPS                            << 
2486         tristate "Test module for compilation << 
2487         help                                  << 
2488           This builds the "test_bitops" modul << 
2489           TEST_LKM module except that it does << 
2490           set/clear_bit macros and get_count_ << 
2491           no compiler warnings from C=1 spars << 
2492           compilations. It has no dependencie << 
2493           explicitly requested by name.  for  << 
2494                                               << 
2495           If unsure, say N.                   << 
2496                                               << 
2497 config TEST_VMALLOC                              1952 config TEST_VMALLOC
2498         tristate "Test module for stress/perf    1953         tristate "Test module for stress/performance analysis of vmalloc allocator"
2499         default n                                1954         default n
2500        depends on MMU                            1955        depends on MMU
2501         depends on m                             1956         depends on m
2502         help                                     1957         help
2503           This builds the "test_vmalloc" modu    1958           This builds the "test_vmalloc" module that should be used for
2504           stress and performance analysis. So    1959           stress and performance analysis. So, any new change for vmalloc
2505           subsystem can be evaluated from per    1960           subsystem can be evaluated from performance and stability point
2506           of view.                               1961           of view.
2507                                                  1962 
2508           If unsure, say N.                      1963           If unsure, say N.
2509                                                  1964 
                                                   >> 1965 config TEST_USER_COPY
                                                   >> 1966         tristate "Test user/kernel boundary protections"
                                                   >> 1967         depends on m
                                                   >> 1968         help
                                                   >> 1969           This builds the "test_user_copy" module that runs sanity checks
                                                   >> 1970           on the copy_to/from_user infrastructure, making sure basic
                                                   >> 1971           user/kernel boundary testing is working. If it fails to load,
                                                   >> 1972           a regression has been detected in the user/kernel memory boundary
                                                   >> 1973           protections.
                                                   >> 1974 
                                                   >> 1975           If unsure, say N.
                                                   >> 1976 
2510 config TEST_BPF                                  1977 config TEST_BPF
2511         tristate "Test BPF filter functionali    1978         tristate "Test BPF filter functionality"
2512         depends on m && NET                      1979         depends on m && NET
2513         help                                     1980         help
2514           This builds the "test_bpf" module t    1981           This builds the "test_bpf" module that runs various test vectors
2515           against the BPF interpreter or BPF     1982           against the BPF interpreter or BPF JIT compiler depending on the
2516           current setting. This is in particu    1983           current setting. This is in particular useful for BPF JIT compiler
2517           development, but also to run regres    1984           development, but also to run regression tests against changes in
2518           the interpreter code. It also enabl    1985           the interpreter code. It also enables test stubs for eBPF maps and
2519           verifier used by user space verifie    1986           verifier used by user space verifier testsuite.
2520                                                  1987 
2521           If unsure, say N.                      1988           If unsure, say N.
2522                                                  1989 
2523 config TEST_BLACKHOLE_DEV                        1990 config TEST_BLACKHOLE_DEV
2524         tristate "Test blackhole netdev funct    1991         tristate "Test blackhole netdev functionality"
2525         depends on m && NET                      1992         depends on m && NET
2526         help                                     1993         help
2527           This builds the "test_blackhole_dev    1994           This builds the "test_blackhole_dev" module that validates the
2528           data path through this blackhole ne    1995           data path through this blackhole netdev.
2529                                                  1996 
2530           If unsure, say N.                      1997           If unsure, say N.
2531                                                  1998 
2532 config FIND_BIT_BENCHMARK                        1999 config FIND_BIT_BENCHMARK
2533         tristate "Test find_bit functions"       2000         tristate "Test find_bit functions"
2534         help                                     2001         help
2535           This builds the "test_find_bit" mod    2002           This builds the "test_find_bit" module that measure find_*_bit()
2536           functions performance.                 2003           functions performance.
2537                                                  2004 
2538           If unsure, say N.                      2005           If unsure, say N.
2539                                                  2006 
2540 config TEST_FIRMWARE                             2007 config TEST_FIRMWARE
2541         tristate "Test firmware loading via u    2008         tristate "Test firmware loading via userspace interface"
2542         depends on FW_LOADER                     2009         depends on FW_LOADER
2543         help                                     2010         help
2544           This builds the "test_firmware" mod    2011           This builds the "test_firmware" module that creates a userspace
2545           interface for testing firmware load    2012           interface for testing firmware loading. This can be used to
2546           control the triggering of firmware     2013           control the triggering of firmware loading without needing an
2547           actual firmware-using device. The c    2014           actual firmware-using device. The contents can be rechecked by
2548           userspace.                             2015           userspace.
2549                                                  2016 
2550           If unsure, say N.                      2017           If unsure, say N.
2551                                                  2018 
2552 config TEST_SYSCTL                               2019 config TEST_SYSCTL
2553         tristate "sysctl test driver"            2020         tristate "sysctl test driver"
2554         depends on PROC_SYSCTL                   2021         depends on PROC_SYSCTL
2555         help                                     2022         help
2556           This builds the "test_sysctl" modul    2023           This builds the "test_sysctl" module. This driver enables to test the
2557           proc sysctl interfaces available to    2024           proc sysctl interfaces available to drivers safely without affecting
2558           production knobs which might alter     2025           production knobs which might alter system functionality.
2559                                                  2026 
2560           If unsure, say N.                      2027           If unsure, say N.
2561                                                  2028 
2562 config BITFIELD_KUNIT                         << 
2563         tristate "KUnit test bitfield functio << 
2564         depends on KUNIT                      << 
2565         default KUNIT_ALL_TESTS               << 
2566         help                                  << 
2567           Enable this option to test the bitf << 
2568                                               << 
2569           KUnit tests run during boot and out << 
2570           in TAP format (http://testanything. << 
2571           running the KUnit test harness, and << 
2572           production build.                   << 
2573                                               << 
2574           For more information on KUnit and u << 
2575           to the KUnit documentation in Docum << 
2576                                               << 
2577           If unsure, say N.                   << 
2578                                               << 
2579 config CHECKSUM_KUNIT                         << 
2580         tristate "KUnit test checksum functio << 
2581         depends on KUNIT                      << 
2582         default KUNIT_ALL_TESTS               << 
2583         help                                  << 
2584           Enable this option to test the chec << 
2585                                               << 
2586           KUnit tests run during boot and out << 
2587           in TAP format (http://testanything. << 
2588           running the KUnit test harness, and << 
2589           production build.                   << 
2590                                               << 
2591           For more information on KUnit and u << 
2592           to the KUnit documentation in Docum << 
2593                                               << 
2594           If unsure, say N.                   << 
2595                                               << 
2596 config HASH_KUNIT_TEST                        << 
2597         tristate "KUnit Test for integer hash << 
2598         depends on KUNIT                      << 
2599         default KUNIT_ALL_TESTS               << 
2600         help                                  << 
2601           Enable this option to test the kern << 
2602           integer (<linux/hash.h>) hash funct << 
2603                                               << 
2604           KUnit tests run during boot and out << 
2605           in TAP format (https://testanything << 
2606           running the KUnit test harness, and << 
2607           production build.                   << 
2608                                               << 
2609           For more information on KUnit and u << 
2610           to the KUnit documentation in Docum << 
2611                                               << 
2612           This is intended to help people wri << 
2613           optimized versions. If unsure, say  << 
2614                                               << 
2615 config RESOURCE_KUNIT_TEST                    << 
2616         tristate "KUnit test for resource API << 
2617         depends on KUNIT                      << 
2618         default KUNIT_ALL_TESTS               << 
2619         help                                  << 
2620           This builds the resource API unit t << 
2621           Tests the logic of API provided by  << 
2622           For more information on KUnit and u << 
2623           to the KUnit documentation in Docum << 
2624                                               << 
2625           If unsure, say N.                   << 
2626                                               << 
2627 config SYSCTL_KUNIT_TEST                         2029 config SYSCTL_KUNIT_TEST
2628         tristate "KUnit test for sysctl" if ! !! 2030         tristate "KUnit test for sysctl"
2629         depends on KUNIT                         2031         depends on KUNIT
2630         default KUNIT_ALL_TESTS               << 
2631         help                                     2032         help
2632           This builds the proc sysctl unit te    2033           This builds the proc sysctl unit test, which runs on boot.
2633           Tests the API contract and implemen    2034           Tests the API contract and implementation correctness of sysctl.
2634           For more information on KUnit and u    2035           For more information on KUnit and unit tests in general please refer
2635           to the KUnit documentation in Docum    2036           to the KUnit documentation in Documentation/dev-tools/kunit/.
2636                                                  2037 
2637           If unsure, say N.                      2038           If unsure, say N.
2638                                                  2039 
2639 config LIST_KUNIT_TEST                           2040 config LIST_KUNIT_TEST
2640         tristate "KUnit Test for Kernel Linke !! 2041         tristate "KUnit Test for Kernel Linked-list structures"
2641         depends on KUNIT                         2042         depends on KUNIT
2642         default KUNIT_ALL_TESTS               << 
2643         help                                     2043         help
2644           This builds the linked list KUnit t    2044           This builds the linked list KUnit test suite.
2645           It tests that the API and basic fun    2045           It tests that the API and basic functionality of the list_head type
2646           and associated macros.                 2046           and associated macros.
2647                                                  2047 
2648           KUnit tests run during boot and out    2048           KUnit tests run during boot and output the results to the debug log
2649           in TAP format (https://testanything !! 2049           in TAP format (http://testanything.org/). Only useful for kernel devs
2650           running the KUnit test harness, and    2050           running the KUnit test harness, and not intended for inclusion into a
2651           production build.                      2051           production build.
2652                                                  2052 
2653           For more information on KUnit and u    2053           For more information on KUnit and unit tests in general please refer
2654           to the KUnit documentation in Docum    2054           to the KUnit documentation in Documentation/dev-tools/kunit/.
2655                                                  2055 
2656           If unsure, say N.                      2056           If unsure, say N.
2657                                                  2057 
2658 config HASHTABLE_KUNIT_TEST                   << 
2659         tristate "KUnit Test for Kernel Hasht << 
2660         depends on KUNIT                      << 
2661         default KUNIT_ALL_TESTS               << 
2662         help                                  << 
2663           This builds the hashtable KUnit tes << 
2664           It tests the basic functionality of << 
2665           include/linux/hashtable.h. For more << 
2666           unit tests in general please refer  << 
2667           in Documentation/dev-tools/kunit/.  << 
2668                                               << 
2669           If unsure, say N.                   << 
2670                                               << 
2671 config LINEAR_RANGES_TEST                     << 
2672         tristate "KUnit test for linear_range << 
2673         depends on KUNIT                      << 
2674         select LINEAR_RANGES                  << 
2675         help                                  << 
2676           This builds the linear_ranges unit  << 
2677           Tests the linear_ranges logic corre << 
2678           For more information on KUnit and u << 
2679           to the KUnit documentation in Docum << 
2680                                               << 
2681           If unsure, say N.                   << 
2682                                               << 
2683 config CMDLINE_KUNIT_TEST                     << 
2684         tristate "KUnit test for cmdline API" << 
2685         depends on KUNIT                      << 
2686         default KUNIT_ALL_TESTS               << 
2687         help                                  << 
2688           This builds the cmdline API unit te << 
2689           Tests the logic of API provided by  << 
2690           For more information on KUnit and u << 
2691           to the KUnit documentation in Docum << 
2692                                               << 
2693           If unsure, say N.                   << 
2694                                               << 
2695 config BITS_TEST                              << 
2696         tristate "KUnit test for bits.h" if ! << 
2697         depends on KUNIT                      << 
2698         default KUNIT_ALL_TESTS               << 
2699         help                                  << 
2700           This builds the bits unit test.     << 
2701           Tests the logic of macros defined i << 
2702           For more information on KUnit and u << 
2703           to the KUnit documentation in Docum << 
2704                                               << 
2705           If unsure, say N.                   << 
2706                                               << 
2707 config SLUB_KUNIT_TEST                        << 
2708         tristate "KUnit test for SLUB cache e << 
2709         depends on SLUB_DEBUG && KUNIT        << 
2710         default KUNIT_ALL_TESTS               << 
2711         help                                  << 
2712           This builds SLUB allocator unit tes << 
2713           Tests SLUB cache debugging function << 
2714           For more information on KUnit and u << 
2715           to the KUnit documentation in Docum << 
2716                                               << 
2717           If unsure, say N.                   << 
2718                                               << 
2719 config RATIONAL_KUNIT_TEST                    << 
2720         tristate "KUnit test for rational.c"  << 
2721         depends on KUNIT && RATIONAL          << 
2722         default KUNIT_ALL_TESTS               << 
2723         help                                  << 
2724           This builds the rational math unit  << 
2725           For more information on KUnit and u << 
2726           to the KUnit documentation in Docum << 
2727                                               << 
2728           If unsure, say N.                   << 
2729                                               << 
2730 config MEMCPY_KUNIT_TEST                      << 
2731         tristate "Test memcpy(), memmove(), a << 
2732         depends on KUNIT                      << 
2733         default KUNIT_ALL_TESTS               << 
2734         help                                  << 
2735           Builds unit tests for memcpy(), mem << 
2736           For more information on KUnit and u << 
2737           to the KUnit documentation in Docum << 
2738                                               << 
2739           If unsure, say N.                   << 
2740                                               << 
2741 config IS_SIGNED_TYPE_KUNIT_TEST              << 
2742         tristate "Test is_signed_type() macro << 
2743         depends on KUNIT                      << 
2744         default KUNIT_ALL_TESTS               << 
2745         help                                  << 
2746           Builds unit tests for the is_signed << 
2747                                               << 
2748           For more information on KUnit and u << 
2749           to the KUnit documentation in Docum << 
2750                                               << 
2751           If unsure, say N.                   << 
2752                                               << 
2753 config OVERFLOW_KUNIT_TEST                    << 
2754         tristate "Test check_*_overflow() fun << 
2755         depends on KUNIT                      << 
2756         default KUNIT_ALL_TESTS               << 
2757         help                                  << 
2758           Builds unit tests for the check_*_o << 
2759           related functions.                  << 
2760                                               << 
2761           For more information on KUnit and u << 
2762           to the KUnit documentation in Docum << 
2763                                               << 
2764           If unsure, say N.                   << 
2765                                               << 
2766 config STACKINIT_KUNIT_TEST                   << 
2767         tristate "Test level of stack variabl << 
2768         depends on KUNIT                      << 
2769         default KUNIT_ALL_TESTS               << 
2770         help                                  << 
2771           Test if the kernel is zero-initiali << 
2772           padding. Coverage is controlled by  << 
2773           CONFIG_INIT_STACK_ALL_PATTERN, CONF << 
2774           CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFI << 
2775           or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYR << 
2776                                               << 
2777 config FORTIFY_KUNIT_TEST                     << 
2778         tristate "Test fortified str*() and m << 
2779         depends on KUNIT                      << 
2780         default KUNIT_ALL_TESTS               << 
2781         help                                  << 
2782           Builds unit tests for checking inte << 
2783           by the str*() and mem*() family of  << 
2784           traps of FORTIFY_SOURCE, see LKDTM' << 
2785                                               << 
2786 config HW_BREAKPOINT_KUNIT_TEST               << 
2787         bool "Test hw_breakpoint constraints  << 
2788         depends on HAVE_HW_BREAKPOINT         << 
2789         depends on KUNIT=y                    << 
2790         default KUNIT_ALL_TESTS               << 
2791         help                                  << 
2792           Tests for hw_breakpoint constraints << 
2793                                               << 
2794           If unsure, say N.                   << 
2795                                               << 
2796 config SIPHASH_KUNIT_TEST                     << 
2797         tristate "Perform selftest on siphash << 
2798         depends on KUNIT                      << 
2799         default KUNIT_ALL_TESTS               << 
2800         help                                  << 
2801           Enable this option to test the kern << 
2802           functions on boot (or module load). << 
2803                                               << 
2804           This is intended to help people wri << 
2805           optimized versions.  If unsure, say << 
2806                                               << 
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                               2058 config TEST_UDELAY
2817         tristate "udelay test driver"            2059         tristate "udelay test driver"
2818         help                                     2060         help
2819           This builds the "udelay_test" modul    2061           This builds the "udelay_test" module that helps to make sure
2820           that udelay() is working properly.     2062           that udelay() is working properly.
2821                                                  2063 
2822           If unsure, say N.                      2064           If unsure, say N.
2823                                                  2065 
2824 config TEST_STATIC_KEYS                          2066 config TEST_STATIC_KEYS
2825         tristate "Test static keys"              2067         tristate "Test static keys"
2826         depends on m                             2068         depends on m
2827         help                                     2069         help
2828           Test the static key interfaces.        2070           Test the static key interfaces.
2829                                                  2071 
2830           If unsure, say N.                      2072           If unsure, say N.
2831                                                  2073 
2832 config TEST_DYNAMIC_DEBUG                     << 
2833         tristate "Test DYNAMIC_DEBUG"         << 
2834         depends on DYNAMIC_DEBUG              << 
2835         help                                  << 
2836           This module registers a tracer call << 
2837           pr_debugs in a 'do_debugging' funct << 
2838           enablements, calls the function, an << 
2839                                               << 
2840           If unsure, say N.                   << 
2841                                               << 
2842 config TEST_KMOD                                 2074 config TEST_KMOD
2843         tristate "kmod stress tester"            2075         tristate "kmod stress tester"
2844         depends on m                             2076         depends on m
2845         depends on NETDEVICES && NET_CORE &&     2077         depends on NETDEVICES && NET_CORE && INET # for TUN
2846         depends on BLOCK                         2078         depends on BLOCK
2847         depends on PAGE_SIZE_LESS_THAN_256KB  << 
2848         select TEST_LKM                          2079         select TEST_LKM
2849         select XFS_FS                            2080         select XFS_FS
2850         select TUN                               2081         select TUN
2851         select BTRFS_FS                          2082         select BTRFS_FS
2852         help                                     2083         help
2853           Test the kernel's module loading me    2084           Test the kernel's module loading mechanism: kmod. kmod implements
2854           support to load modules using the L    2085           support to load modules using the Linux kernel's usermode helper.
2855           This test provides a series of test    2086           This test provides a series of tests against kmod.
2856                                                  2087 
2857           Although technically you can either    2088           Although technically you can either build test_kmod as a module or
2858           into the kernel we disallow buildin    2089           into the kernel we disallow building it into the kernel since
2859           it stress tests request_module() an    2090           it stress tests request_module() and this will very likely cause
2860           some issues by taking over precious    2091           some issues by taking over precious threads available from other
2861           module load requests, ultimately th    2092           module load requests, ultimately this could be fatal.
2862                                                  2093 
2863           To run tests run:                      2094           To run tests run:
2864                                                  2095 
2865           tools/testing/selftests/kmod/kmod.s    2096           tools/testing/selftests/kmod/kmod.sh --help
2866                                                  2097 
2867           If unsure, say N.                      2098           If unsure, say N.
2868                                                  2099 
2869 config TEST_DEBUG_VIRTUAL                        2100 config TEST_DEBUG_VIRTUAL
2870         tristate "Test CONFIG_DEBUG_VIRTUAL f    2101         tristate "Test CONFIG_DEBUG_VIRTUAL feature"
2871         depends on DEBUG_VIRTUAL                 2102         depends on DEBUG_VIRTUAL
2872         help                                     2103         help
2873           Test the kernel's ability to detect    2104           Test the kernel's ability to detect incorrect calls to
2874           virt_to_phys() done against the non    2105           virt_to_phys() done against the non-linear part of the
2875           kernel's virtual address map.          2106           kernel's virtual address map.
2876                                                  2107 
2877           If unsure, say N.                      2108           If unsure, say N.
2878                                                  2109 
2879 config TEST_MEMCAT_P                             2110 config TEST_MEMCAT_P
2880         tristate "Test memcat_p() helper func    2111         tristate "Test memcat_p() helper function"
2881         help                                     2112         help
2882           Test the memcat_p() helper for corr    2113           Test the memcat_p() helper for correctly merging two
2883           pointer arrays together.               2114           pointer arrays together.
2884                                                  2115 
2885           If unsure, say N.                      2116           If unsure, say N.
2886                                                  2117 
2887 config TEST_OBJAGG                            !! 2118 config TEST_LIVEPATCH
2888         tristate "Perform selftest on object  !! 2119         tristate "Test livepatching"
2889         default n                                2120         default n
2890         depends on OBJAGG                     !! 2121         depends on DYNAMIC_DEBUG
                                                   >> 2122         depends on LIVEPATCH
                                                   >> 2123         depends on m
2891         help                                     2124         help
2892           Enable this option to test object a !! 2125           Test kernel livepatching features for correctness.  The tests will
2893           (or module load).                   !! 2126           load test modules that will be livepatched in various scenarios.
2894                                                  2127 
2895 config TEST_MEMINIT                           !! 2128           To run all the livepatching tests:
2896         tristate "Test heap/page initializati << 
2897         help                                  << 
2898           Test if the kernel is zero-initiali << 
2899           This can be useful to test init_on_ << 
2900                                                  2129 
2901           If unsure, say N.                   !! 2130           make -C tools/testing/selftests TARGETS=livepatch run_tests
2902                                                  2131 
2903 config TEST_HMM                               !! 2132           Alternatively, individual tests may be invoked:
2904         tristate "Test HMM (Heterogeneous Mem << 
2905         depends on TRANSPARENT_HUGEPAGE       << 
2906         depends on DEVICE_PRIVATE             << 
2907         select HMM_MIRROR                     << 
2908         select MMU_NOTIFIER                   << 
2909         help                                  << 
2910           This is a pseudo device driver sole << 
2911           Say M here if you want to build the << 
2912           Doing so will allow you to run tool << 
2913                                                  2133 
2914           If unsure, say N.                   !! 2134           tools/testing/selftests/livepatch/test-callbacks.sh
                                                   >> 2135           tools/testing/selftests/livepatch/test-livepatch.sh
                                                   >> 2136           tools/testing/selftests/livepatch/test-shadow-vars.sh
2915                                                  2137 
2916 config TEST_FREE_PAGES                        !! 2138           If unsure, say N.
2917         tristate "Test freeing pages"         << 
2918         help                                  << 
2919           Test that a memory leak does not oc << 
2920           freeing a block of pages and a spec << 
2921           Loading this module is safe if your << 
2922           If the bug is not fixed, it will le << 
2923           probably OOM your system.           << 
2924                                                  2139 
2925 config TEST_FPU                               !! 2140 config TEST_OBJAGG
2926         tristate "Test floating point operati !! 2141         tristate "Perform selftest on object aggreration manager"
2927         depends on ARCH_HAS_KERNEL_FPU_SUPPOR !! 2142         default n
                                                   >> 2143         depends on OBJAGG
2928         help                                     2144         help
2929           Enable this option to add /sys/kern !! 2145           Enable this option to test object aggregation manager on boot
2930           which will trigger a sequence of fl !! 2146           (or module load).
2931           for self-testing floating point con << 
2932           kernel_fpu_begin().                 << 
2933                                                  2147 
2934           If unsure, say N.                   << 
2935                                                  2148 
2936 config TEST_CLOCKSOURCE_WATCHDOG              !! 2149 config TEST_STACKINIT
2937         tristate "Test clocksource watchdog i !! 2150         tristate "Test level of stack variable initialization"
2938         depends on CLOCKSOURCE_WATCHDOG       << 
2939         help                                     2151         help
2940           Enable this option to create a kern !! 2152           Test if the kernel is zero-initializing stack variables and
2941           a test of the clocksource watchdog. !! 2153           padding. Coverage is controlled by compiler flags,
2942           via modprobe or insmod in which cas !! 2154           CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
2943           loaded, or it may be built in, in w !! 2155           or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
2944           shortly after boot.                 << 
2945                                                  2156 
2946           If unsure, say N.                      2157           If unsure, say N.
2947                                                  2158 
2948 config TEST_OBJPOOL                           !! 2159 config TEST_MEMINIT
2949         tristate "Test module for correctness !! 2160         tristate "Test heap/page initialization"
2950         default n                             << 
2951         depends on m && DEBUG_KERNEL          << 
2952         help                                     2161         help
2953           This builds the "test_objpool" modu !! 2162           Test if the kernel is zero-initializing heap and page allocations.
2954           correctness verification and concur !! 2163           This can be useful to test init_on_alloc and init_on_free features.
2955           allocation and reclamation.         << 
2956                                                  2164 
2957           If unsure, say N.                      2165           If unsure, say N.
2958                                                  2166 
2959 endif # RUNTIME_TESTING_MENU                     2167 endif # RUNTIME_TESTING_MENU
2960                                                  2168 
2961 config ARCH_USE_MEMTEST                       << 
2962         bool                                  << 
2963         help                                  << 
2964           An architecture should select this  << 
2965           during boot process.                << 
2966                                               << 
2967 config MEMTEST                                   2169 config MEMTEST
2968         bool "Memtest"                           2170         bool "Memtest"
2969         depends on ARCH_USE_MEMTEST           !! 2171         ---help---
2970         help                                  << 
2971           This option adds a kernel parameter    2172           This option adds a kernel parameter 'memtest', which allows memtest
2972           to be set and executed.             !! 2173           to be set.
2973                 memtest=0, mean disabled; --     2174                 memtest=0, mean disabled; -- default
2974                 memtest=1, mean do 1 test pat    2175                 memtest=1, mean do 1 test pattern;
2975                 ...                              2176                 ...
2976                 memtest=17, mean do 17 test p    2177                 memtest=17, mean do 17 test patterns.
2977           If you are unsure how to answer thi    2178           If you are unsure how to answer this question, answer N.
2978                                                  2179 
2979                                                  2180 
2980                                                  2181 
2981 config HYPERV_TESTING                            2182 config HYPERV_TESTING
2982         bool "Microsoft Hyper-V driver testin    2183         bool "Microsoft Hyper-V driver testing"
2983         default n                                2184         default n
2984         depends on HYPERV && DEBUG_FS            2185         depends on HYPERV && DEBUG_FS
2985         help                                     2186         help
2986           Select this option to enable Hyper-    2187           Select this option to enable Hyper-V vmbus testing.
2987                                                  2188 
2988 endmenu # "Kernel Testing and Coverage"          2189 endmenu # "Kernel Testing and Coverage"
2989                                               << 
2990 menu "Rust hacking"                           << 
2991                                               << 
2992 config RUST_DEBUG_ASSERTIONS                  << 
2993         bool "Debug assertions"               << 
2994         depends on RUST                       << 
2995         help                                  << 
2996           Enables rustc's `-Cdebug-assertions << 
2997                                               << 
2998           This flag lets you turn `cfg(debug_ << 
2999           compilation on or off. This can be  << 
3000           code in development but not in prod << 
3001           the behavior of the standard librar << 
3002                                               << 
3003           Note that this will apply to all Ru << 
3004                                               << 
3005           If unsure, say N.                   << 
3006                                               << 
3007 config RUST_OVERFLOW_CHECKS                   << 
3008         bool "Overflow checks"                << 
3009         default y                             << 
3010         depends on RUST                       << 
3011         help                                  << 
3012           Enables rustc's `-Coverflow-checks` << 
3013                                               << 
3014           This flag allows you to control the << 
3015           overflow. When overflow-checks are  << 
3016           on overflow.                        << 
3017                                               << 
3018           Note that this will apply to all Ru << 
3019                                               << 
3020           If unsure, say Y.                   << 
3021                                               << 
3022 config RUST_BUILD_ASSERT_ALLOW                << 
3023         bool "Allow unoptimized build-time as << 
3024         depends on RUST                       << 
3025         help                                  << 
3026           Controls how are `build_error!` and << 
3027                                               << 
3028           If calls to them exist in the binar << 
3029           or that the optimizer failed to ver << 
3030                                               << 
3031           This should not happen, thus by def << 
3032           as an escape hatch, you can choose  << 
3033           and let the check be carried at run << 
3034           the check fails).                   << 
3035                                               << 
3036           If unsure, say N.                   << 
3037                                               << 
3038 config RUST_KERNEL_DOCTESTS                   << 
3039         bool "Doctests for the `kernel` crate << 
3040         depends on RUST && KUNIT=y            << 
3041         default KUNIT_ALL_TESTS               << 
3042         help                                  << 
3043           This builds the documentation tests << 
3044           as KUnit tests.                     << 
3045                                               << 
3046           For more information on KUnit and u << 
3047           please refer to the KUnit documenta << 
3048                                               << 
3049           If unsure, say N.                   << 
3050                                               << 
3051 endmenu # "Rust"                              << 
3052                                                  2190 
3053 endmenu # Kernel hacking                         2191 endmenu # Kernel hacking
                                                      

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