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TOMOYO Linux Cross Reference
Linux/lib/Kconfig.debug

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Diff markup

Differences between /lib/Kconfig.debug (Version linux-6.11.5) and /lib/Kconfig.debug (Version linux-5.5.19)


  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"
379         depends on !DEBUG_INFO_SPLIT && !DEBUG !! 243         depends on DEBUG_INFO
380         depends on !GCC_PLUGIN_RANDSTRUCT || C << 
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                                      244         help
386           Generate deduplicated BTF type infor    245           Generate deduplicated BTF type information from DWARF debug info.
387           Turning this on expects presence of     246           Turning this on expects presence of pahole tool, which will convert
388           DWARF type info into equivalent dedu    247           DWARF type info into equivalent deduplicated BTF type info.
389                                                   248 
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                                249 config GDB_SCRIPTS
428         bool "Provide GDB scripts for kernel d    250         bool "Provide GDB scripts for kernel debugging"
                                                   >> 251         depends on DEBUG_INFO
429         help                                      252         help
430           This creates the required links to G    253           This creates the required links to GDB helper scripts in the
431           build directory. If you load vmlinux    254           build directory. If you load vmlinux into gdb, the helper
432           scripts will be automatically import    255           scripts will be automatically imported by gdb as well, and
433           additional functions are available t    256           additional functions are available to analyze a Linux kernel
434           instance. See Documentation/dev-tool    257           instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
435           for further details.                    258           for further details.
436                                                   259 
437 endif # DEBUG_INFO                             !! 260 config ENABLE_MUST_CHECK
                                                   >> 261         bool "Enable __must_check logic"
                                                   >> 262         default y
                                                   >> 263         help
                                                   >> 264           Enable the __must_check logic in the kernel build.  Disable this to
                                                   >> 265           suppress the "warning: ignoring return value of 'foo', declared with
                                                   >> 266           attribute warn_unused_result" messages.
438                                                   267 
439 config FRAME_WARN                                 268 config FRAME_WARN
440         int "Warn for stack frames larger than !! 269         int "Warn for stack frames larger than (needs gcc 4.4)"
441         range 0 8192                              270         range 0 8192
442         default 0 if KMSAN                     << 
443         default 2048 if GCC_PLUGIN_LATENT_ENTR    271         default 2048 if GCC_PLUGIN_LATENT_ENTROPY
444         default 2048 if PARISC                 !! 272         default 1280 if (!64BIT && PARISC)
445         default 1536 if (!64BIT && XTENSA)     !! 273         default 1024 if (!64BIT && !PARISC)
446         default 1280 if KASAN && !64BIT        << 
447         default 1024 if !64BIT                 << 
448         default 2048 if 64BIT                     274         default 2048 if 64BIT
449         help                                      275         help
450           Tell the compiler to warn at build t !! 276           Tell gcc to warn at build time for stack frames larger than this.
451           Setting this too low will cause a lo    277           Setting this too low will cause a lot of warnings.
452           Setting it to 0 disables the warning    278           Setting it to 0 disables the warning.
                                                   >> 279           Requires gcc 4.4
453                                                   280 
454 config STRIP_ASM_SYMS                             281 config STRIP_ASM_SYMS
455         bool "Strip assembler-generated symbol    282         bool "Strip assembler-generated symbols during link"
456         default n                                 283         default n
457         help                                      284         help
458           Strip internal assembler-generated s    285           Strip internal assembler-generated symbols during a link (symbols
459           that look like '.Lxxx') so they don'    286           that look like '.Lxxx') so they don't pollute the output of
460           get_wchan() and suchlike.               287           get_wchan() and suchlike.
461                                                   288 
462 config READABLE_ASM                               289 config READABLE_ASM
463         bool "Generate readable assembler code    290         bool "Generate readable assembler code"
464         depends on DEBUG_KERNEL                   291         depends on DEBUG_KERNEL
465         depends on CC_IS_GCC                   << 
466         help                                      292         help
467           Disable some compiler optimizations     293           Disable some compiler optimizations that tend to generate human unreadable
468           assembler output. This may make the     294           assembler output. This may make the kernel slightly slower, but it helps
469           to keep kernel developers who have t    295           to keep kernel developers who have to stare a lot at assembler listings
470           sane.                                   296           sane.
471                                                   297 
472 config HEADERS_INSTALL                            298 config HEADERS_INSTALL
473         bool "Install uapi headers to usr/incl    299         bool "Install uapi headers to usr/include"
474         depends on !UML                           300         depends on !UML
475         help                                      301         help
476           This option will install uapi header    302           This option will install uapi headers (headers exported to user-space)
477           into the usr/include directory for u    303           into the usr/include directory for use during the kernel build.
478           This is unneeded for building the ke    304           This is unneeded for building the kernel itself, but needed for some
479           user-space program samples. It is al    305           user-space program samples. It is also needed by some features such
480           as uapi header sanity checks.           306           as uapi header sanity checks.
481                                                   307 
                                                   >> 308 config OPTIMIZE_INLINING
                                                   >> 309         def_bool y
                                                   >> 310         help
                                                   >> 311           This option determines if the kernel forces gcc to inline the functions
                                                   >> 312           developers have marked 'inline'. Doing so takes away freedom from gcc to
                                                   >> 313           do what it thinks is best, which is desirable for the gcc 3.x series of
                                                   >> 314           compilers. The gcc 4.x series have a rewritten inlining algorithm and
                                                   >> 315           enabling this option will generate a smaller kernel there. Hopefully
                                                   >> 316           this algorithm is so good that allowing gcc 4.x and above to make the
                                                   >> 317           decision will become the default in the future. Until then this option
                                                   >> 318           is there to test gcc for this.
                                                   >> 319 
482 config DEBUG_SECTION_MISMATCH                     320 config DEBUG_SECTION_MISMATCH
483         bool "Enable full Section mismatch ana    321         bool "Enable full Section mismatch analysis"
484         depends on CC_IS_GCC                   << 
485         help                                      322         help
486           The section mismatch analysis checks    323           The section mismatch analysis checks if there are illegal
487           references from one section to anoth    324           references from one section to another section.
488           During linktime or runtime, some sec    325           During linktime or runtime, some sections are dropped;
489           any use of code/data previously in t    326           any use of code/data previously in these sections would
490           most likely result in an oops.          327           most likely result in an oops.
491           In the code, functions and variables    328           In the code, functions and variables are annotated with
492           __init,, etc. (see the full list in     329           __init,, etc. (see the full list in include/linux/init.h),
493           which results in the code/data being    330           which results in the code/data being placed in specific sections.
494           The section mismatch analysis is alw    331           The section mismatch analysis is always performed after a full
495           kernel build, and enabling this opti    332           kernel build, and enabling this option causes the following
496           additional step to occur:               333           additional step to occur:
497           - Add the option -fno-inline-functio    334           - Add the option -fno-inline-functions-called-once to gcc commands.
498             When inlining a function annotated    335             When inlining a function annotated with __init in a non-init
499             function, we would lose the sectio    336             function, we would lose the section information and thus
500             the analysis would not catch the i    337             the analysis would not catch the illegal reference.
501             This option tells gcc to inline le    338             This option tells gcc to inline less (but it does result in
502             a larger kernel).                     339             a larger kernel).
503                                                   340 
504 config SECTION_MISMATCH_WARN_ONLY                 341 config SECTION_MISMATCH_WARN_ONLY
505         bool "Make section mismatch errors non    342         bool "Make section mismatch errors non-fatal"
506         default y                                 343         default y
507         help                                      344         help
508           If you say N here, the build process    345           If you say N here, the build process will fail if there are any
509           section mismatch, instead of just th    346           section mismatch, instead of just throwing warnings.
510                                                   347 
511           If unsure, say Y.                       348           If unsure, say Y.
512                                                   349 
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 #                                                 350 #
527 # Select this config option from the architect    351 # Select this config option from the architecture Kconfig, if it
528 # is preferred to always offer frame pointers     352 # is preferred to always offer frame pointers as a config
529 # option on the architecture (regardless of KE    353 # option on the architecture (regardless of KERNEL_DEBUG):
530 #                                                 354 #
531 config ARCH_WANT_FRAME_POINTERS                   355 config ARCH_WANT_FRAME_POINTERS
532         bool                                      356         bool
533                                                   357 
534 config FRAME_POINTER                              358 config FRAME_POINTER
535         bool "Compile the kernel with frame po    359         bool "Compile the kernel with frame pointers"
536         depends on DEBUG_KERNEL && (M68K || UM    360         depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS
537         default y if (DEBUG_INFO && UML) || AR    361         default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
538         help                                      362         help
539           If you say Y here the resulting kern    363           If you say Y here the resulting kernel image will be slightly
540           larger and slower, but it gives very    364           larger and slower, but it gives very useful debugging information
541           in case of kernel bugs. (precise oop    365           in case of kernel bugs. (precise oopses/stacktraces/warnings)
542                                                   366 
543 config OBJTOOL                                 << 
544         bool                                   << 
545                                                << 
546 config STACK_VALIDATION                           367 config STACK_VALIDATION
547         bool "Compile-time stack metadata vali    368         bool "Compile-time stack metadata validation"
548         depends on HAVE_STACK_VALIDATION && UN !! 369         depends on HAVE_STACK_VALIDATION
549         select OBJTOOL                         << 
550         default n                                 370         default n
551         help                                      371         help
552           Validate frame pointer rules at comp !! 372           Add compile-time checks to validate stack metadata, including frame
553           runtime stack traces are more reliab !! 373           pointers (if CONFIG_FRAME_POINTER is enabled).  This helps ensure
                                                   >> 374           that runtime stack traces are more reliable.
554                                                   375 
555           For more information, see            !! 376           This is also a prerequisite for generation of ORC unwind data, which
556           tools/objtool/Documentation/objtool. !! 377           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                                                   378 
564 config VMLINUX_MAP                             !! 379           For more information, see
565         bool "Generate vmlinux.map file when l !! 380           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                                                   381 
574 config DEBUG_FORCE_WEAK_PER_CPU                   382 config DEBUG_FORCE_WEAK_PER_CPU
575         bool "Force weak per-cpu definitions"     383         bool "Force weak per-cpu definitions"
576         depends on DEBUG_KERNEL                   384         depends on DEBUG_KERNEL
577         help                                      385         help
578           s390 and alpha require percpu variab    386           s390 and alpha require percpu variables in modules to be
579           defined weak to work around addressi    387           defined weak to work around addressing range issue which
580           puts the following two restrictions     388           puts the following two restrictions on percpu variable
581           definitions.                            389           definitions.
582                                                   390 
583           1. percpu symbols must be unique whe    391           1. percpu symbols must be unique whether static or not
584           2. percpu variables can't be defined    392           2. percpu variables can't be defined inside a function
585                                                   393 
586           To ensure that generic code follows     394           To ensure that generic code follows the above rules, this
587           option forces all percpu variables t    395           option forces all percpu variables to be defined as weak.
588                                                   396 
589 endmenu # "Compiler options"                      397 endmenu # "Compiler options"
590                                                   398 
591 menu "Generic Kernel Debugging Instruments"       399 menu "Generic Kernel Debugging Instruments"
592                                                   400 
593 config MAGIC_SYSRQ                                401 config MAGIC_SYSRQ
594         bool "Magic SysRq key"                    402         bool "Magic SysRq key"
595         depends on !UML                           403         depends on !UML
596         help                                      404         help
597           If you say Y here, you will have som    405           If you say Y here, you will have some control over the system even
598           if the system crashes for example du    406           if the system crashes for example during kernel debugging (e.g., you
599           will be able to flush the buffer cac    407           will be able to flush the buffer cache to disk, reboot the system
600           immediately or dump some status info    408           immediately or dump some status information). This is accomplished
601           by pressing various keys while holdi    409           by pressing various keys while holding SysRq (Alt+PrintScreen). It
602           also works on a serial console (on P    410           also works on a serial console (on PC hardware at least), if you
603           send a BREAK and then within 5 secon    411           send a BREAK and then within 5 seconds a command keypress. The
604           keys are documented in <file:Documen    412           keys are documented in <file:Documentation/admin-guide/sysrq.rst>.
605           Don't say Y unless you really know w    413           Don't say Y unless you really know what this hack does.
606                                                   414 
607 config MAGIC_SYSRQ_DEFAULT_ENABLE                 415 config MAGIC_SYSRQ_DEFAULT_ENABLE
608         hex "Enable magic SysRq key functions     416         hex "Enable magic SysRq key functions by default"
609         depends on MAGIC_SYSRQ                    417         depends on MAGIC_SYSRQ
610         default 0x1                               418         default 0x1
611         help                                      419         help
612           Specifies which SysRq key functions     420           Specifies which SysRq key functions are enabled by default.
613           This may be set to 1 or 0 to enable     421           This may be set to 1 or 0 to enable or disable them all, or
614           to a bitmask as described in Documen    422           to a bitmask as described in Documentation/admin-guide/sysrq.rst.
615                                                   423 
616 config MAGIC_SYSRQ_SERIAL                         424 config MAGIC_SYSRQ_SERIAL
617         bool "Enable magic SysRq key over seri    425         bool "Enable magic SysRq key over serial"
618         depends on MAGIC_SYSRQ                    426         depends on MAGIC_SYSRQ
619         default y                                 427         default y
620         help                                      428         help
621           Many embedded boards have a disconne    429           Many embedded boards have a disconnected TTL level serial which can
622           generate some garbage that can lead     430           generate some garbage that can lead to spurious false sysrq detects.
623           This option allows you to decide whe    431           This option allows you to decide whether you want to enable the
624           magic SysRq key.                        432           magic SysRq key.
625                                                   433 
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                                   434 config DEBUG_FS
637         bool "Debug Filesystem"                   435         bool "Debug Filesystem"
638         help                                      436         help
639           debugfs is a virtual file system tha    437           debugfs is a virtual file system that kernel developers use to put
640           debugging files into.  Enable this o    438           debugging files into.  Enable this option to be able to read and
641           write to these files.                   439           write to these files.
642                                                   440 
643           For detailed documentation on the de    441           For detailed documentation on the debugfs API, see
644           Documentation/filesystems/.             442           Documentation/filesystems/.
645                                                   443 
646           If unsure, say N.                       444           If unsure, say N.
647                                                   445 
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"                         446 source "lib/Kconfig.kgdb"
                                                   >> 447 
681 source "lib/Kconfig.ubsan"                        448 source "lib/Kconfig.ubsan"
682 source "lib/Kconfig.kcsan"                     << 
683                                                   449 
684 endmenu                                           450 endmenu
685                                                   451 
686 menu "Networking Debugging"                    !! 452 config DEBUG_KERNEL
                                                   >> 453         bool "Kernel debugging"
                                                   >> 454         help
                                                   >> 455           Say Y here if you are developing drivers or trying to debug and
                                                   >> 456           identify kernel problems.
687                                                   457 
688 source "net/Kconfig.debug"                     !! 458 config DEBUG_MISC
                                                   >> 459         bool "Miscellaneous debug code"
                                                   >> 460         default DEBUG_KERNEL
                                                   >> 461         depends on DEBUG_KERNEL
                                                   >> 462         help
                                                   >> 463           Say Y here if you need to enable miscellaneous debug code that should
                                                   >> 464           be under a more specific debug option but isn't.
689                                                   465 
690 endmenu # "Networking Debugging"               << 
691                                                   466 
692 menu "Memory Debugging"                           467 menu "Memory Debugging"
693                                                   468 
694 source "mm/Kconfig.debug"                         469 source "mm/Kconfig.debug"
695                                                   470 
696 config DEBUG_OBJECTS                              471 config DEBUG_OBJECTS
697         bool "Debug object operations"            472         bool "Debug object operations"
698         depends on DEBUG_KERNEL                   473         depends on DEBUG_KERNEL
699         help                                      474         help
700           If you say Y here, additional code w    475           If you say Y here, additional code will be inserted into the
701           kernel to track the life time of var    476           kernel to track the life time of various objects and validate
702           the operations on those objects.        477           the operations on those objects.
703                                                   478 
704 config DEBUG_OBJECTS_SELFTEST                     479 config DEBUG_OBJECTS_SELFTEST
705         bool "Debug objects selftest"             480         bool "Debug objects selftest"
706         depends on DEBUG_OBJECTS                  481         depends on DEBUG_OBJECTS
707         help                                      482         help
708           This enables the selftest of the obj    483           This enables the selftest of the object debug code.
709                                                   484 
710 config DEBUG_OBJECTS_FREE                         485 config DEBUG_OBJECTS_FREE
711         bool "Debug objects in freed memory"      486         bool "Debug objects in freed memory"
712         depends on DEBUG_OBJECTS                  487         depends on DEBUG_OBJECTS
713         help                                      488         help
714           This enables checks whether a k/v fr    489           This enables checks whether a k/v free operation frees an area
715           which contains an object which has n    490           which contains an object which has not been deactivated
716           properly. This can make kmalloc/kfre    491           properly. This can make kmalloc/kfree-intensive workloads
717           much slower.                            492           much slower.
718                                                   493 
719 config DEBUG_OBJECTS_TIMERS                       494 config DEBUG_OBJECTS_TIMERS
720         bool "Debug timer objects"                495         bool "Debug timer objects"
721         depends on DEBUG_OBJECTS                  496         depends on DEBUG_OBJECTS
722         help                                      497         help
723           If you say Y here, additional code w    498           If you say Y here, additional code will be inserted into the
724           timer routines to track the life tim    499           timer routines to track the life time of timer objects and
725           validate the timer operations.          500           validate the timer operations.
726                                                   501 
727 config DEBUG_OBJECTS_WORK                         502 config DEBUG_OBJECTS_WORK
728         bool "Debug work objects"                 503         bool "Debug work objects"
729         depends on DEBUG_OBJECTS                  504         depends on DEBUG_OBJECTS
730         help                                      505         help
731           If you say Y here, additional code w    506           If you say Y here, additional code will be inserted into the
732           work queue routines to track the lif    507           work queue routines to track the life time of work objects and
733           validate the work operations.           508           validate the work operations.
734                                                   509 
735 config DEBUG_OBJECTS_RCU_HEAD                     510 config DEBUG_OBJECTS_RCU_HEAD
736         bool "Debug RCU callbacks objects"        511         bool "Debug RCU callbacks objects"
737         depends on DEBUG_OBJECTS                  512         depends on DEBUG_OBJECTS
738         help                                      513         help
739           Enable this to turn on debugging of     514           Enable this to turn on debugging of RCU list heads (call_rcu() usage).
740                                                   515 
741 config DEBUG_OBJECTS_PERCPU_COUNTER               516 config DEBUG_OBJECTS_PERCPU_COUNTER
742         bool "Debug percpu counter objects"       517         bool "Debug percpu counter objects"
743         depends on DEBUG_OBJECTS                  518         depends on DEBUG_OBJECTS
744         help                                      519         help
745           If you say Y here, additional code w    520           If you say Y here, additional code will be inserted into the
746           percpu counter routines to track the    521           percpu counter routines to track the life time of percpu counter
747           objects and validate the percpu coun    522           objects and validate the percpu counter operations.
748                                                   523 
749 config DEBUG_OBJECTS_ENABLE_DEFAULT               524 config DEBUG_OBJECTS_ENABLE_DEFAULT
750         int "debug_objects bootup default valu    525         int "debug_objects bootup default value (0-1)"
751         range 0 1                                 526         range 0 1
752         default "1"                               527         default "1"
753         depends on DEBUG_OBJECTS                  528         depends on DEBUG_OBJECTS
754         help                                      529         help
755           Debug objects boot parameter default    530           Debug objects boot parameter default value
756                                                   531 
757 config SHRINKER_DEBUG                          !! 532 config DEBUG_SLAB
758         bool "Enable shrinker debugging suppor !! 533         bool "Debug slab memory allocations"
759         depends on DEBUG_FS                    !! 534         depends on DEBUG_KERNEL && SLAB
                                                   >> 535         help
                                                   >> 536           Say Y here to have the kernel do limited verification on memory
                                                   >> 537           allocation as well as poisoning memory on free to catch use of freed
                                                   >> 538           memory. This can make kmalloc/kfree-intensive workloads much slower.
                                                   >> 539 
                                                   >> 540 config SLUB_DEBUG_ON
                                                   >> 541         bool "SLUB debugging on by default"
                                                   >> 542         depends on SLUB && SLUB_DEBUG
                                                   >> 543         default n
                                                   >> 544         help
                                                   >> 545           Boot with debugging on by default. SLUB boots by default with
                                                   >> 546           the runtime debug capabilities switched off. Enabling this is
                                                   >> 547           equivalent to specifying the "slub_debug" parameter on boot.
                                                   >> 548           There is no support for more fine grained debug control like
                                                   >> 549           possible with slub_debug=xxx. SLUB debugging may be switched
                                                   >> 550           off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
                                                   >> 551           "slub_debug=-".
                                                   >> 552 
                                                   >> 553 config SLUB_STATS
                                                   >> 554         default n
                                                   >> 555         bool "Enable SLUB performance statistics"
                                                   >> 556         depends on SLUB && SYSFS
                                                   >> 557         help
                                                   >> 558           SLUB statistics are useful to debug SLUBs allocation behavior in
                                                   >> 559           order find ways to optimize the allocator. This should never be
                                                   >> 560           enabled for production use since keeping statistics slows down
                                                   >> 561           the allocator by a few percentage points. The slabinfo command
                                                   >> 562           supports the determination of the most active slabs to figure
                                                   >> 563           out which slabs are relevant to a particular load.
                                                   >> 564           Try running: slabinfo -DA
                                                   >> 565 
                                                   >> 566 config HAVE_DEBUG_KMEMLEAK
                                                   >> 567         bool
                                                   >> 568 
                                                   >> 569 config DEBUG_KMEMLEAK
                                                   >> 570         bool "Kernel memory leak detector"
                                                   >> 571         depends on DEBUG_KERNEL && HAVE_DEBUG_KMEMLEAK
                                                   >> 572         select DEBUG_FS
                                                   >> 573         select STACKTRACE if STACKTRACE_SUPPORT
                                                   >> 574         select KALLSYMS
                                                   >> 575         select CRC32
760         help                                      576         help
761           Say Y to enable the shrinker debugfs !! 577           Say Y here if you want to enable the memory leak
762           visibility into the kernel memory sh !! 578           detector. The memory allocation/freeing is traced in a way
763           Disable it to avoid an extra memory  !! 579           similar to the Boehm's conservative garbage collector, the
                                                   >> 580           difference being that the orphan objects are not freed but
                                                   >> 581           only shown in /sys/kernel/debug/kmemleak. Enabling this
                                                   >> 582           feature will introduce an overhead to memory
                                                   >> 583           allocations. See Documentation/dev-tools/kmemleak.rst for more
                                                   >> 584           details.
                                                   >> 585 
                                                   >> 586           Enabling DEBUG_SLAB or SLUB_DEBUG may increase the chances
                                                   >> 587           of finding leaks due to the slab objects poisoning.
                                                   >> 588 
                                                   >> 589           In order to access the kmemleak file, debugfs needs to be
                                                   >> 590           mounted (usually at /sys/kernel/debug).
                                                   >> 591 
                                                   >> 592 config DEBUG_KMEMLEAK_MEM_POOL_SIZE
                                                   >> 593         int "Kmemleak memory pool size"
                                                   >> 594         depends on DEBUG_KMEMLEAK
                                                   >> 595         range 200 1000000
                                                   >> 596         default 16000
                                                   >> 597         help
                                                   >> 598           Kmemleak must track all the memory allocations to avoid
                                                   >> 599           reporting false positives. Since memory may be allocated or
                                                   >> 600           freed before kmemleak is fully initialised, use a static pool
                                                   >> 601           of metadata objects to track such callbacks. After kmemleak is
                                                   >> 602           fully initialised, this memory pool acts as an emergency one
                                                   >> 603           if slab allocations fail.
                                                   >> 604 
                                                   >> 605 config DEBUG_KMEMLEAK_TEST
                                                   >> 606         tristate "Simple test for the kernel memory leak detector"
                                                   >> 607         depends on DEBUG_KMEMLEAK && m
                                                   >> 608         help
                                                   >> 609           This option enables a module that explicitly leaks memory.
                                                   >> 610 
                                                   >> 611           If unsure, say N.
                                                   >> 612 
                                                   >> 613 config DEBUG_KMEMLEAK_DEFAULT_OFF
                                                   >> 614         bool "Default kmemleak to off"
                                                   >> 615         depends on DEBUG_KMEMLEAK
                                                   >> 616         help
                                                   >> 617           Say Y here to disable kmemleak by default. It can then be enabled
                                                   >> 618           on the command line via kmemleak=on.
                                                   >> 619 
                                                   >> 620 config DEBUG_KMEMLEAK_AUTO_SCAN
                                                   >> 621         bool "Enable kmemleak auto scan thread on boot up"
                                                   >> 622         default y
                                                   >> 623         depends on DEBUG_KMEMLEAK
                                                   >> 624         help
                                                   >> 625           Depending on the cpu, kmemleak scan may be cpu intensive and can
                                                   >> 626           stall user tasks at times. This option enables/disables automatic
                                                   >> 627           kmemleak scan at boot up.
                                                   >> 628 
                                                   >> 629           Say N here to disable kmemleak auto scan thread to stop automatic
                                                   >> 630           scanning. Disabling this option disables automatic reporting of
                                                   >> 631           memory leaks.
                                                   >> 632 
                                                   >> 633           If unsure, say Y.
764                                                   634 
765 config DEBUG_STACK_USAGE                          635 config DEBUG_STACK_USAGE
766         bool "Stack utilization instrumentatio    636         bool "Stack utilization instrumentation"
767         depends on DEBUG_KERNEL                !! 637         depends on DEBUG_KERNEL && !IA64
768         help                                      638         help
769           Enables the display of the minimum a    639           Enables the display of the minimum amount of free stack which each
770           task has ever had available in the s    640           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                                                   641 
774           This option will slow down process c    642           This option will slow down process creation somewhat.
775                                                   643 
776 config SCHED_STACK_END_CHECK                      644 config SCHED_STACK_END_CHECK
777         bool "Detect stack corruption on calls    645         bool "Detect stack corruption on calls to schedule()"
778         depends on DEBUG_KERNEL                   646         depends on DEBUG_KERNEL
779         default n                                 647         default n
780         help                                      648         help
781           This option checks for a stack overr    649           This option checks for a stack overrun on calls to schedule().
782           If the stack end location is found t    650           If the stack end location is found to be over written always panic as
783           the content of the corrupted region     651           the content of the corrupted region can no longer be trusted.
784           This is to ensure no erroneous behav    652           This is to ensure no erroneous behaviour occurs which could result in
785           data corruption or a sporadic crash     653           data corruption or a sporadic crash at a later stage once the region
786           is examined. The runtime overhead in    654           is examined. The runtime overhead introduced is minimal.
787                                                   655 
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                                   656 config DEBUG_VM
798         bool "Debug VM"                           657         bool "Debug VM"
799         depends on DEBUG_KERNEL                   658         depends on DEBUG_KERNEL
800         help                                      659         help
801           Enable this to turn on extended chec    660           Enable this to turn on extended checks in the virtual-memory system
802           that may impact performance.            661           that may impact performance.
803                                                   662 
804           If unsure, say N.                       663           If unsure, say N.
805                                                   664 
806 config DEBUG_VM_SHOOT_LAZIES                   !! 665 config DEBUG_VM_VMACACHE
807         bool "Debug MMU_LAZY_TLB_SHOOTDOWN imp !! 666         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                       667         depends on DEBUG_VM
819         select DEBUG_MAPLE_TREE                << 
820         help                                      668         help
821           Enable VM maple tree debugging infor !! 669           Enable this to turn on VMA caching debug information. Doing so
                                                   >> 670           can cause significant overhead, so only enable it in non-production
                                                   >> 671           environments.
822                                                   672 
823           If unsure, say N.                       673           If unsure, say N.
824                                                   674 
825 config DEBUG_VM_RB                                675 config DEBUG_VM_RB
826         bool "Debug VM red-black trees"           676         bool "Debug VM red-black trees"
827         depends on DEBUG_VM                       677         depends on DEBUG_VM
828         help                                      678         help
829           Enable VM red-black tree debugging i    679           Enable VM red-black tree debugging information and extra validations.
830                                                   680 
831           If unsure, say N.                       681           If unsure, say N.
832                                                   682 
833 config DEBUG_VM_PGFLAGS                           683 config DEBUG_VM_PGFLAGS
834         bool "Debug page-flags operations"        684         bool "Debug page-flags operations"
835         depends on DEBUG_VM                       685         depends on DEBUG_VM
836         help                                      686         help
837           Enables extra validation on page fla    687           Enables extra validation on page flags operations.
838                                                   688 
839           If unsure, say N.                       689           If unsure, say N.
840                                                   690 
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                     691 config ARCH_HAS_DEBUG_VIRTUAL
858         bool                                      692         bool
859                                                   693 
860 config DEBUG_VIRTUAL                              694 config DEBUG_VIRTUAL
861         bool "Debug VM translations"              695         bool "Debug VM translations"
862         depends on DEBUG_KERNEL && ARCH_HAS_DE    696         depends on DEBUG_KERNEL && ARCH_HAS_DEBUG_VIRTUAL
863         help                                      697         help
864           Enable some costly sanity checks in     698           Enable some costly sanity checks in virtual to page code. This can
865           catch mistakes with virt_to_page() a    699           catch mistakes with virt_to_page() and friends.
866                                                   700 
867           If unsure, say N.                       701           If unsure, say N.
868                                                   702 
869 config DEBUG_NOMMU_REGIONS                        703 config DEBUG_NOMMU_REGIONS
870         bool "Debug the global anon/private NO    704         bool "Debug the global anon/private NOMMU mapping region tree"
871         depends on DEBUG_KERNEL && !MMU           705         depends on DEBUG_KERNEL && !MMU
872         help                                      706         help
873           This option causes the global tree o    707           This option causes the global tree of anonymous and private mapping
874           regions to be regularly checked for     708           regions to be regularly checked for invalid topology.
875                                                   709 
876 config DEBUG_MEMORY_INIT                          710 config DEBUG_MEMORY_INIT
877         bool "Debug memory initialisation" if     711         bool "Debug memory initialisation" if EXPERT
878         default !EXPERT                           712         default !EXPERT
879         help                                      713         help
880           Enable this for additional checks du    714           Enable this for additional checks during memory initialisation.
881           The sanity checks verify aspects of     715           The sanity checks verify aspects of the VM such as the memory model
882           and other information provided by th    716           and other information provided by the architecture. Verbose
883           information will be printed at KERN_    717           information will be printed at KERN_DEBUG loglevel depending
884           on the mminit_loglevel= command-line    718           on the mminit_loglevel= command-line option.
885                                                   719 
886           If unsure, say Y                        720           If unsure, say Y
887                                                   721 
888 config MEMORY_NOTIFIER_ERROR_INJECT               722 config MEMORY_NOTIFIER_ERROR_INJECT
889         tristate "Memory hotplug notifier erro    723         tristate "Memory hotplug notifier error injection module"
890         depends on MEMORY_HOTPLUG && NOTIFIER_ !! 724         depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
891         help                                      725         help
892           This option provides the ability to     726           This option provides the ability to inject artificial errors to
893           memory hotplug notifier chain callba    727           memory hotplug notifier chain callbacks.  It is controlled through
894           debugfs interface under /sys/kernel/    728           debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
895                                                   729 
896           If the notifier call chain should be    730           If the notifier call chain should be failed with some events
897           notified, write the error code to "a    731           notified, write the error code to "actions/<notifier event>/error".
898                                                   732 
899           Example: Inject memory hotplug offli    733           Example: Inject memory hotplug offline error (-12 == -ENOMEM)
900                                                   734 
901           # cd /sys/kernel/debug/notifier-erro    735           # cd /sys/kernel/debug/notifier-error-inject/memory
902           # echo -12 > actions/MEM_GOING_OFFLI    736           # echo -12 > actions/MEM_GOING_OFFLINE/error
903           # echo offline > /sys/devices/system    737           # echo offline > /sys/devices/system/memory/memoryXXX/state
904           bash: echo: write error: Cannot allo    738           bash: echo: write error: Cannot allocate memory
905                                                   739 
906           To compile this code as a module, ch    740           To compile this code as a module, choose M here: the module will
907           be called memory-notifier-error-inje    741           be called memory-notifier-error-inject.
908                                                   742 
909           If unsure, say N.                       743           If unsure, say N.
910                                                   744 
911 config DEBUG_PER_CPU_MAPS                         745 config DEBUG_PER_CPU_MAPS
912         bool "Debug access to per_cpu maps"       746         bool "Debug access to per_cpu maps"
913         depends on DEBUG_KERNEL                   747         depends on DEBUG_KERNEL
914         depends on SMP                            748         depends on SMP
915         help                                      749         help
916           Say Y to verify that the per_cpu map    750           Say Y to verify that the per_cpu map being accessed has
917           been set up. This adds a fair amount    751           been set up. This adds a fair amount of code to kernel memory
918           and decreases performance.              752           and decreases performance.
919                                                   753 
920           Say N if unsure.                        754           Say N if unsure.
921                                                   755 
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                              756 config DEBUG_HIGHMEM
943         bool "Highmem debugging"                  757         bool "Highmem debugging"
944         depends on DEBUG_KERNEL && HIGHMEM        758         depends on DEBUG_KERNEL && HIGHMEM
945         select DEBUG_KMAP_LOCAL_FORCE_MAP if A << 
946         select DEBUG_KMAP_LOCAL                << 
947         help                                      759         help
948           This option enables additional error    760           This option enables additional error checking for high memory
949           systems.  Disable for production sys    761           systems.  Disable for production systems.
950                                                   762 
951 config HAVE_DEBUG_STACKOVERFLOW                   763 config HAVE_DEBUG_STACKOVERFLOW
952         bool                                      764         bool
953                                                   765 
954 config DEBUG_STACKOVERFLOW                        766 config DEBUG_STACKOVERFLOW
955         bool "Check for stack overflows"          767         bool "Check for stack overflows"
956         depends on DEBUG_KERNEL && HAVE_DEBUG_    768         depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
957         help                                   !! 769         ---help---
958           Say Y here if you want to check for     770           Say Y here if you want to check for overflows of kernel, IRQ
959           and exception stacks (if your archit    771           and exception stacks (if your architecture uses them). This
960           option will show detailed messages i    772           option will show detailed messages if free stack space drops
961           below a certain limit.                  773           below a certain limit.
962                                                   774 
963           These kinds of bugs usually occur wh    775           These kinds of bugs usually occur when call-chains in the
964           kernel get too deep, especially when    776           kernel get too deep, especially when interrupts are
965           involved.                               777           involved.
966                                                   778 
967           Use this in cases where you see appa    779           Use this in cases where you see apparently random memory
968           corruption, especially if it appears    780           corruption, especially if it appears in 'struct thread_info'
969                                                   781 
970           If in doubt, say "N".                   782           If in doubt, say "N".
971                                                   783 
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"                       784 source "lib/Kconfig.kasan"
1004 source "lib/Kconfig.kfence"                   << 
1005 source "lib/Kconfig.kmsan"                    << 
1006                                                  785 
1007 endmenu # "Memory Debugging"                     786 endmenu # "Memory Debugging"
1008                                                  787 
1009 config DEBUG_SHIRQ                               788 config DEBUG_SHIRQ
1010         bool "Debug shared IRQ handlers"         789         bool "Debug shared IRQ handlers"
1011         depends on DEBUG_KERNEL                  790         depends on DEBUG_KERNEL
1012         help                                     791         help
1013           Enable this to generate a spurious  !! 792           Enable this to generate a spurious interrupt as soon as a shared
1014           interrupt handler is deregistered ( !! 793           interrupt handler is registered, and just before one is deregistered.
1015           is currently disabled). Drivers nee !! 794           Drivers ought to be able to handle interrupts coming in at those
1016           don't and need to be caught.        !! 795           points; some don't and need to be caught.
1017                                                  796 
1018 menu "Debug Oops, Lockups and Hangs"             797 menu "Debug Oops, Lockups and Hangs"
1019                                                  798 
1020 config PANIC_ON_OOPS                             799 config PANIC_ON_OOPS
1021         bool "Panic on Oops"                     800         bool "Panic on Oops"
1022         help                                     801         help
1023           Say Y here to enable the kernel to     802           Say Y here to enable the kernel to panic when it oopses. This
1024           has the same effect as setting oops    803           has the same effect as setting oops=panic on the kernel command
1025           line.                                  804           line.
1026                                                  805 
1027           This feature is useful to ensure th    806           This feature is useful to ensure that the kernel does not do
1028           anything erroneous after an oops wh    807           anything erroneous after an oops which could result in data
1029           corruption or other issues.            808           corruption or other issues.
1030                                                  809 
1031           Say N if unsure.                       810           Say N if unsure.
1032                                                  811 
1033 config PANIC_ON_OOPS_VALUE                       812 config PANIC_ON_OOPS_VALUE
1034         int                                      813         int
1035         range 0 1                                814         range 0 1
1036         default 0 if !PANIC_ON_OOPS              815         default 0 if !PANIC_ON_OOPS
1037         default 1 if PANIC_ON_OOPS               816         default 1 if PANIC_ON_OOPS
1038                                                  817 
1039 config PANIC_TIMEOUT                             818 config PANIC_TIMEOUT
1040         int "panic timeout"                      819         int "panic timeout"
1041         default 0                                820         default 0
1042         help                                     821         help
1043           Set the timeout value (in seconds)  !! 822           Set the timeout value (in seconds) until a reboot occurs when the
1044           the kernel panics. If n = 0, then w    823           the kernel panics. If n = 0, then we wait forever. A timeout
1045           value n > 0 will wait n seconds bef    824           value n > 0 will wait n seconds before rebooting, while a timeout
1046           value n < 0 will reboot immediately !! 825           value n < 0 will reboot immediately.
1047           with the kernel command line option << 
1048           /proc/sys/kernel/panic.             << 
1049                                                  826 
1050 config LOCKUP_DETECTOR                           827 config LOCKUP_DETECTOR
1051         bool                                     828         bool
1052                                                  829 
1053 config SOFTLOCKUP_DETECTOR                       830 config SOFTLOCKUP_DETECTOR
1054         bool "Detect Soft Lockups"               831         bool "Detect Soft Lockups"
1055         depends on DEBUG_KERNEL && !S390         832         depends on DEBUG_KERNEL && !S390
1056         select LOCKUP_DETECTOR                   833         select LOCKUP_DETECTOR
1057         help                                     834         help
1058           Say Y here to enable the kernel to     835           Say Y here to enable the kernel to act as a watchdog to detect
1059           soft lockups.                          836           soft lockups.
1060                                                  837 
1061           Softlockups are bugs that cause the    838           Softlockups are bugs that cause the kernel to loop in kernel
1062           mode for more than 20 seconds, with    839           mode for more than 20 seconds, without giving other tasks a
1063           chance to run.  The current stack t    840           chance to run.  The current stack trace is displayed upon
1064           detection and the system will stay     841           detection and the system will stay locked up.
1065                                                  842 
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                843 config BOOTPARAM_SOFTLOCKUP_PANIC
1081         bool "Panic (Reboot) On Soft Lockups"    844         bool "Panic (Reboot) On Soft Lockups"
1082         depends on SOFTLOCKUP_DETECTOR           845         depends on SOFTLOCKUP_DETECTOR
1083         help                                     846         help
1084           Say Y here to enable the kernel to     847           Say Y here to enable the kernel to panic on "soft lockups",
1085           which are bugs that cause the kerne    848           which are bugs that cause the kernel to loop in kernel
1086           mode for more than 20 seconds (conf    849           mode for more than 20 seconds (configurable using the watchdog_thresh
1087           sysctl), without giving other tasks    850           sysctl), without giving other tasks a chance to run.
1088                                                  851 
1089           The panic can be used in combinatio    852           The panic can be used in combination with panic_timeout,
1090           to cause the system to reboot autom    853           to cause the system to reboot automatically after a
1091           lockup has been detected. This feat    854           lockup has been detected. This feature is useful for
1092           high-availability systems that have    855           high-availability systems that have uptime guarantees and
1093           where a lockup must be resolved ASA    856           where a lockup must be resolved ASAP.
1094                                                  857 
1095           Say N if unsure.                       858           Say N if unsure.
1096                                                  859 
1097 config HAVE_HARDLOCKUP_DETECTOR_BUDDY         !! 860 config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
                                                   >> 861         int
                                                   >> 862         depends on SOFTLOCKUP_DETECTOR
                                                   >> 863         range 0 1
                                                   >> 864         default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
                                                   >> 865         default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
                                                   >> 866 
                                                   >> 867 config HARDLOCKUP_DETECTOR_PERF
1098         bool                                     868         bool
1099         depends on SMP                        !! 869         select SOFTLOCKUP_DETECTOR
1100         default y                             << 
1101                                                  870 
1102 #                                                871 #
1103 # Global switch whether to build a hardlockup !! 872 # Enables a timestamp based low pass filter to compensate for perf based
1104 # only when the architecture supports at leas !! 873 # hard lockup detection which runs too fast due to turbo modes.
1105 # two exceptions. The hardlockup detector is  << 
1106 #                                                874 #
1107 #       s390: it reported many false positive !! 875 config HARDLOCKUP_CHECK_TIMESTAMP
                                                   >> 876         bool
                                                   >> 877 
1108 #                                                878 #
1109 #       sparc64: has a custom implementation  !! 879 # arch/ can define HAVE_HARDLOCKUP_DETECTOR_ARCH to provide their own hard
1110 #               hardlockup command line optio !! 880 # lockup detector rather than the perf based detector.
1111 #                                                881 #
1112 config HARDLOCKUP_DETECTOR                       882 config HARDLOCKUP_DETECTOR
1113         bool "Detect Hard Lockups"               883         bool "Detect Hard Lockups"
1114         depends on DEBUG_KERNEL && !S390 && ! !! 884         depends on DEBUG_KERNEL && !S390
1115         depends on HAVE_HARDLOCKUP_DETECTOR_P !! 885         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                   886         select LOCKUP_DETECTOR
1120                                               !! 887         select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF
                                                   >> 888         select HARDLOCKUP_DETECTOR_ARCH if HAVE_HARDLOCKUP_DETECTOR_ARCH
1121         help                                     889         help
1122           Say Y here to enable the kernel to     890           Say Y here to enable the kernel to act as a watchdog to detect
1123           hard lockups.                          891           hard lockups.
1124                                                  892 
1125           Hardlockups are bugs that cause the    893           Hardlockups are bugs that cause the CPU to loop in kernel mode
1126           for more than 10 seconds, without l    894           for more than 10 seconds, without letting other interrupts have a
1127           chance to run.  The current stack t    895           chance to run.  The current stack trace is displayed upon detection
1128           and the system will stay locked up.    896           and the system will stay locked up.
1129                                                  897 
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                898 config BOOTPARAM_HARDLOCKUP_PANIC
1188         bool "Panic (Reboot) On Hard Lockups"    899         bool "Panic (Reboot) On Hard Lockups"
1189         depends on HARDLOCKUP_DETECTOR           900         depends on HARDLOCKUP_DETECTOR
1190         help                                     901         help
1191           Say Y here to enable the kernel to     902           Say Y here to enable the kernel to panic on "hard lockups",
1192           which are bugs that cause the kerne    903           which are bugs that cause the kernel to loop in kernel
1193           mode with interrupts disabled for m    904           mode with interrupts disabled for more than 10 seconds (configurable
1194           using the watchdog_thresh sysctl).     905           using the watchdog_thresh sysctl).
1195                                                  906 
1196           Say N if unsure.                       907           Say N if unsure.
1197                                                  908 
                                                   >> 909 config BOOTPARAM_HARDLOCKUP_PANIC_VALUE
                                                   >> 910         int
                                                   >> 911         depends on HARDLOCKUP_DETECTOR
                                                   >> 912         range 0 1
                                                   >> 913         default 0 if !BOOTPARAM_HARDLOCKUP_PANIC
                                                   >> 914         default 1 if BOOTPARAM_HARDLOCKUP_PANIC
                                                   >> 915 
1198 config DETECT_HUNG_TASK                          916 config DETECT_HUNG_TASK
1199         bool "Detect Hung Tasks"                 917         bool "Detect Hung Tasks"
1200         depends on DEBUG_KERNEL                  918         depends on DEBUG_KERNEL
1201         default SOFTLOCKUP_DETECTOR              919         default SOFTLOCKUP_DETECTOR
1202         help                                     920         help
1203           Say Y here to enable the kernel to     921           Say Y here to enable the kernel to detect "hung tasks",
1204           which are bugs that cause the task     922           which are bugs that cause the task to be stuck in
1205           uninterruptible "D" state indefinit    923           uninterruptible "D" state indefinitely.
1206                                                  924 
1207           When a hung task is detected, the k    925           When a hung task is detected, the kernel will print the
1208           current stack trace (which you shou    926           current stack trace (which you should report), but the
1209           task will stay in uninterruptible s    927           task will stay in uninterruptible state. If lockdep is
1210           enabled then all held locks will al    928           enabled then all held locks will also be reported. This
1211           feature has negligible overhead.       929           feature has negligible overhead.
1212                                                  930 
1213 config DEFAULT_HUNG_TASK_TIMEOUT                 931 config DEFAULT_HUNG_TASK_TIMEOUT
1214         int "Default timeout for hung task de    932         int "Default timeout for hung task detection (in seconds)"
1215         depends on DETECT_HUNG_TASK              933         depends on DETECT_HUNG_TASK
1216         default 120                              934         default 120
1217         help                                     935         help
1218           This option controls the default ti    936           This option controls the default timeout (in seconds) used
1219           to determine when a task has become    937           to determine when a task has become non-responsive and should
1220           be considered hung.                    938           be considered hung.
1221                                                  939 
1222           It can be adjusted at runtime via t    940           It can be adjusted at runtime via the kernel.hung_task_timeout_secs
1223           sysctl or by writing a value to        941           sysctl or by writing a value to
1224           /proc/sys/kernel/hung_task_timeout_    942           /proc/sys/kernel/hung_task_timeout_secs.
1225                                                  943 
1226           A timeout of 0 disables the check.     944           A timeout of 0 disables the check.  The default is two minutes.
1227           Keeping the default should be fine     945           Keeping the default should be fine in most cases.
1228                                                  946 
1229 config BOOTPARAM_HUNG_TASK_PANIC                 947 config BOOTPARAM_HUNG_TASK_PANIC
1230         bool "Panic (Reboot) On Hung Tasks"      948         bool "Panic (Reboot) On Hung Tasks"
1231         depends on DETECT_HUNG_TASK              949         depends on DETECT_HUNG_TASK
1232         help                                     950         help
1233           Say Y here to enable the kernel to     951           Say Y here to enable the kernel to panic on "hung tasks",
1234           which are bugs that cause the kerne    952           which are bugs that cause the kernel to leave a task stuck
1235           in uninterruptible "D" state.          953           in uninterruptible "D" state.
1236                                                  954 
1237           The panic can be used in combinatio    955           The panic can be used in combination with panic_timeout,
1238           to cause the system to reboot autom    956           to cause the system to reboot automatically after a
1239           hung task has been detected. This f    957           hung task has been detected. This feature is useful for
1240           high-availability systems that have    958           high-availability systems that have uptime guarantees and
1241           where a hung tasks must be resolved    959           where a hung tasks must be resolved ASAP.
1242                                                  960 
1243           Say N if unsure.                       961           Say N if unsure.
1244                                                  962 
                                                   >> 963 config BOOTPARAM_HUNG_TASK_PANIC_VALUE
                                                   >> 964         int
                                                   >> 965         depends on DETECT_HUNG_TASK
                                                   >> 966         range 0 1
                                                   >> 967         default 0 if !BOOTPARAM_HUNG_TASK_PANIC
                                                   >> 968         default 1 if BOOTPARAM_HUNG_TASK_PANIC
                                                   >> 969 
1245 config WQ_WATCHDOG                               970 config WQ_WATCHDOG
1246         bool "Detect Workqueue Stalls"           971         bool "Detect Workqueue Stalls"
1247         depends on DEBUG_KERNEL                  972         depends on DEBUG_KERNEL
1248         help                                     973         help
1249           Say Y here to enable stall detectio    974           Say Y here to enable stall detection on workqueues.  If a
1250           worker pool doesn't make forward pr    975           worker pool doesn't make forward progress on a pending work
1251           item for over a given amount of tim    976           item for over a given amount of time, 30s by default, a
1252           warning message is printed along wi    977           warning message is printed along with dump of workqueue
1253           state.  This can be configured thro    978           state.  This can be configured through kernel parameter
1254           "workqueue.watchdog_thresh" and its    979           "workqueue.watchdog_thresh" and its sysfs counterpart.
1255                                                  980 
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"              981 endmenu # "Debug lockups and hangs"
1283                                                  982 
1284 menu "Scheduler Debugging"                       983 menu "Scheduler Debugging"
1285                                                  984 
1286 config SCHED_DEBUG                               985 config SCHED_DEBUG
1287         bool "Collect scheduler debugging inf    986         bool "Collect scheduler debugging info"
1288         depends on DEBUG_KERNEL && DEBUG_FS   !! 987         depends on DEBUG_KERNEL && PROC_FS
1289         default y                                988         default y
1290         help                                     989         help
1291           If you say Y here, the /sys/kernel/ !! 990           If you say Y here, the /proc/sched_debug file will be provided
1292           that can help debug the scheduler.     991           that can help debug the scheduler. The runtime overhead of this
1293           option is minimal.                     992           option is minimal.
1294                                                  993 
1295 config SCHED_INFO                                994 config SCHED_INFO
1296         bool                                     995         bool
1297         default n                                996         default n
1298                                                  997 
1299 config SCHEDSTATS                                998 config SCHEDSTATS
1300         bool "Collect scheduler statistics"      999         bool "Collect scheduler statistics"
1301         depends on PROC_FS                    !! 1000         depends on DEBUG_KERNEL && PROC_FS
1302         select SCHED_INFO                        1001         select SCHED_INFO
1303         help                                     1002         help
1304           If you say Y here, additional code     1003           If you say Y here, additional code will be inserted into the
1305           scheduler and related routines to c    1004           scheduler and related routines to collect statistics about
1306           scheduler behavior and provide them    1005           scheduler behavior and provide them in /proc/schedstat.  These
1307           stats may be useful for both tuning    1006           stats may be useful for both tuning and debugging the scheduler
1308           If you aren't debugging the schedul    1007           If you aren't debugging the scheduler or trying to tune a specific
1309           application, you can say N to avoid    1008           application, you can say N to avoid the very slight overhead
1310           this adds.                             1009           this adds.
1311                                                  1010 
1312 endmenu                                          1011 endmenu
1313                                                  1012 
1314 config DEBUG_TIMEKEEPING                         1013 config DEBUG_TIMEKEEPING
1315         bool "Enable extra timekeeping sanity    1014         bool "Enable extra timekeeping sanity checking"
1316         help                                     1015         help
1317           This option will enable additional     1016           This option will enable additional timekeeping sanity checks
1318           which may be helpful when diagnosin    1017           which may be helpful when diagnosing issues where timekeeping
1319           problems are suspected.                1018           problems are suspected.
1320                                                  1019 
1321           This may include checks in the time    1020           This may include checks in the timekeeping hotpaths, so this
1322           option may have a (very small) perf    1021           option may have a (very small) performance impact to some
1323           workloads.                             1022           workloads.
1324                                                  1023 
1325           If unsure, say N.                      1024           If unsure, say N.
1326                                                  1025 
1327 config DEBUG_PREEMPT                             1026 config DEBUG_PREEMPT
1328         bool "Debug preemptible kernel"          1027         bool "Debug preemptible kernel"
1329         depends on DEBUG_KERNEL && PREEMPTION !! 1028         depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
                                                   >> 1029         default y
1330         help                                     1030         help
1331           If you say Y here then the kernel w    1031           If you say Y here then the kernel will use a debug variant of the
1332           commonly used smp_processor_id() fu    1032           commonly used smp_processor_id() function and will print warnings
1333           if kernel code uses it in a preempt    1033           if kernel code uses it in a preemption-unsafe way. Also, the kernel
1334           will detect preemption count underf    1034           will detect preemption count underflows.
1335                                                  1035 
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    1036 menu "Lock Debugging (spinlocks, mutexes, etc...)"
1341                                                  1037 
1342 config LOCK_DEBUGGING_SUPPORT                    1038 config LOCK_DEBUGGING_SUPPORT
1343         bool                                     1039         bool
1344         depends on TRACE_IRQFLAGS_SUPPORT &&     1040         depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
1345         default y                                1041         default y
1346                                                  1042 
1347 config PROVE_LOCKING                             1043 config PROVE_LOCKING
1348         bool "Lock debugging: prove locking c    1044         bool "Lock debugging: prove locking correctness"
1349         depends on DEBUG_KERNEL && LOCK_DEBUG    1045         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1350         select LOCKDEP                           1046         select LOCKDEP
1351         select DEBUG_SPINLOCK                    1047         select DEBUG_SPINLOCK
1352         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1048         select DEBUG_MUTEXES
1353         select DEBUG_RT_MUTEXES if RT_MUTEXES    1049         select DEBUG_RT_MUTEXES if RT_MUTEXES
1354         select DEBUG_RWSEMS if !PREEMPT_RT    !! 1050         select DEBUG_RWSEMS
1355         select DEBUG_WW_MUTEX_SLOWPATH           1051         select DEBUG_WW_MUTEX_SLOWPATH
1356         select DEBUG_LOCK_ALLOC                  1052         select DEBUG_LOCK_ALLOC
1357         select PREEMPT_COUNT if !ARCH_NO_PREE << 
1358         select TRACE_IRQFLAGS                    1053         select TRACE_IRQFLAGS
1359         default n                                1054         default n
1360         help                                     1055         help
1361          This feature enables the kernel to p    1056          This feature enables the kernel to prove that all locking
1362          that occurs in the kernel runtime is    1057          that occurs in the kernel runtime is mathematically
1363          correct: that under no circumstance     1058          correct: that under no circumstance could an arbitrary (and
1364          not yet triggered) combination of ob    1059          not yet triggered) combination of observed locking
1365          sequences (on an arbitrary number of    1060          sequences (on an arbitrary number of CPUs, running an
1366          arbitrary number of tasks and interr    1061          arbitrary number of tasks and interrupt contexts) cause a
1367          deadlock.                               1062          deadlock.
1368                                                  1063 
1369          In short, this feature enables the k    1064          In short, this feature enables the kernel to report locking
1370          related deadlocks before they actual    1065          related deadlocks before they actually occur.
1371                                                  1066 
1372          The proof does not depend on how har    1067          The proof does not depend on how hard and complex a
1373          deadlock scenario would be to trigge    1068          deadlock scenario would be to trigger: how many
1374          participant CPUs, tasks and irq-cont    1069          participant CPUs, tasks and irq-contexts would be needed
1375          for it to trigger. The proof also do    1070          for it to trigger. The proof also does not depend on
1376          timing: if a race and a resulting de    1071          timing: if a race and a resulting deadlock is possible
1377          theoretically (no matter how unlikel    1072          theoretically (no matter how unlikely the race scenario
1378          is), it will be proven so and will i    1073          is), it will be proven so and will immediately be
1379          reported by the kernel (once the eve    1074          reported by the kernel (once the event is observed that
1380          makes the deadlock theoretically pos    1075          makes the deadlock theoretically possible).
1381                                                  1076 
1382          If a deadlock is impossible (i.e. th    1077          If a deadlock is impossible (i.e. the locking rules, as
1383          observed by the kernel, are mathemat    1078          observed by the kernel, are mathematically correct), the
1384          kernel reports nothing.                 1079          kernel reports nothing.
1385                                                  1080 
1386          NOTE: this feature can also be enabl    1081          NOTE: this feature can also be enabled for rwlocks, mutexes
1387          and rwsems - in which case all depen    1082          and rwsems - in which case all dependencies between these
1388          different locking variants are obser    1083          different locking variants are observed and mapped too, and
1389          the proof of observed correctness is    1084          the proof of observed correctness is also maintained for an
1390          arbitrary combination of these separ    1085          arbitrary combination of these separate locking variants.
1391                                                  1086 
1392          For more details, see Documentation/    1087          For more details, see Documentation/locking/lockdep-design.rst.
1393                                                  1088 
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                                 1089 config LOCK_STAT
1412         bool "Lock usage statistics"             1090         bool "Lock usage statistics"
1413         depends on DEBUG_KERNEL && LOCK_DEBUG    1091         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1414         select LOCKDEP                           1092         select LOCKDEP
1415         select DEBUG_SPINLOCK                    1093         select DEBUG_SPINLOCK
1416         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1094         select DEBUG_MUTEXES
1417         select DEBUG_RT_MUTEXES if RT_MUTEXES    1095         select DEBUG_RT_MUTEXES if RT_MUTEXES
1418         select DEBUG_LOCK_ALLOC                  1096         select DEBUG_LOCK_ALLOC
1419         default n                                1097         default n
1420         help                                     1098         help
1421          This feature enables tracking lock c    1099          This feature enables tracking lock contention points
1422                                                  1100 
1423          For more details, see Documentation/    1101          For more details, see Documentation/locking/lockstat.rst
1424                                                  1102 
1425          This also enables lock events requir    1103          This also enables lock events required by "perf lock",
1426          subcommand of perf.                     1104          subcommand of perf.
1427          If you want to use "perf lock", you     1105          If you want to use "perf lock", you also need to turn on
1428          CONFIG_EVENT_TRACING.                   1106          CONFIG_EVENT_TRACING.
1429                                                  1107 
1430          CONFIG_LOCK_STAT defines "contended"    1108          CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
1431          (CONFIG_LOCKDEP defines "acquire" an    1109          (CONFIG_LOCKDEP defines "acquire" and "release" events.)
1432                                                  1110 
1433 config DEBUG_RT_MUTEXES                          1111 config DEBUG_RT_MUTEXES
1434         bool "RT Mutex debugging, deadlock de    1112         bool "RT Mutex debugging, deadlock detection"
1435         depends on DEBUG_KERNEL && RT_MUTEXES    1113         depends on DEBUG_KERNEL && RT_MUTEXES
1436         help                                     1114         help
1437          This allows rt mutex semantics viola    1115          This allows rt mutex semantics violations and rt mutex related
1438          deadlocks (lockups) to be detected a    1116          deadlocks (lockups) to be detected and reported automatically.
1439                                                  1117 
1440 config DEBUG_SPINLOCK                            1118 config DEBUG_SPINLOCK
1441         bool "Spinlock and rw-lock debugging:    1119         bool "Spinlock and rw-lock debugging: basic checks"
1442         depends on DEBUG_KERNEL                  1120         depends on DEBUG_KERNEL
1443         select UNINLINE_SPIN_UNLOCK              1121         select UNINLINE_SPIN_UNLOCK
1444         help                                     1122         help
1445           Say Y here and build SMP to catch m    1123           Say Y here and build SMP to catch missing spinlock initialization
1446           and certain other kinds of spinlock    1124           and certain other kinds of spinlock errors commonly made.  This is
1447           best used in conjunction with the N    1125           best used in conjunction with the NMI watchdog so that spinlock
1448           deadlocks are also debuggable.         1126           deadlocks are also debuggable.
1449                                                  1127 
1450 config DEBUG_MUTEXES                             1128 config DEBUG_MUTEXES
1451         bool "Mutex debugging: basic checks"     1129         bool "Mutex debugging: basic checks"
1452         depends on DEBUG_KERNEL && !PREEMPT_R !! 1130         depends on DEBUG_KERNEL
1453         help                                     1131         help
1454          This feature allows mutex semantics     1132          This feature allows mutex semantics violations to be detected and
1455          reported.                               1133          reported.
1456                                                  1134 
1457 config DEBUG_WW_MUTEX_SLOWPATH                   1135 config DEBUG_WW_MUTEX_SLOWPATH
1458         bool "Wait/wound mutex debugging: Slo    1136         bool "Wait/wound mutex debugging: Slowpath testing"
1459         depends on DEBUG_KERNEL && LOCK_DEBUG    1137         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1460         select DEBUG_LOCK_ALLOC                  1138         select DEBUG_LOCK_ALLOC
1461         select DEBUG_SPINLOCK                    1139         select DEBUG_SPINLOCK
1462         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1140         select DEBUG_MUTEXES
1463         select DEBUG_RT_MUTEXES if PREEMPT_RT << 
1464         help                                     1141         help
1465          This feature enables slowpath testin    1142          This feature enables slowpath testing for w/w mutex users by
1466          injecting additional -EDEADLK wound/    1143          injecting additional -EDEADLK wound/backoff cases. Together with
1467          the full mutex checks enabled with (    1144          the full mutex checks enabled with (CONFIG_PROVE_LOCKING) this
1468          will test all possible w/w mutex int    1145          will test all possible w/w mutex interface abuse with the
1469          exception of simply not acquiring al    1146          exception of simply not acquiring all the required locks.
1470          Note that this feature can introduce    1147          Note that this feature can introduce significant overhead, so
1471          it really should not be enabled in a    1148          it really should not be enabled in a production or distro kernel,
1472          even a debug kernel.  If you are a d    1149          even a debug kernel.  If you are a driver writer, enable it.  If
1473          you are a distro, do not.               1150          you are a distro, do not.
1474                                                  1151 
1475 config DEBUG_RWSEMS                              1152 config DEBUG_RWSEMS
1476         bool "RW Semaphore debugging: basic c    1153         bool "RW Semaphore debugging: basic checks"
1477         depends on DEBUG_KERNEL && !PREEMPT_R !! 1154         depends on DEBUG_KERNEL
1478         help                                     1155         help
1479           This debugging feature allows misma    1156           This debugging feature allows mismatched rw semaphore locks
1480           and unlocks to be detected and repo    1157           and unlocks to be detected and reported.
1481                                                  1158 
1482 config DEBUG_LOCK_ALLOC                          1159 config DEBUG_LOCK_ALLOC
1483         bool "Lock debugging: detect incorrec    1160         bool "Lock debugging: detect incorrect freeing of live locks"
1484         depends on DEBUG_KERNEL && LOCK_DEBUG    1161         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1485         select DEBUG_SPINLOCK                    1162         select DEBUG_SPINLOCK
1486         select DEBUG_MUTEXES if !PREEMPT_RT   !! 1163         select DEBUG_MUTEXES
1487         select DEBUG_RT_MUTEXES if RT_MUTEXES    1164         select DEBUG_RT_MUTEXES if RT_MUTEXES
1488         select LOCKDEP                           1165         select LOCKDEP
1489         help                                     1166         help
1490          This feature will check whether any     1167          This feature will check whether any held lock (spinlock, rwlock,
1491          mutex or rwsem) is incorrectly freed    1168          mutex or rwsem) is incorrectly freed by the kernel, via any of the
1492          memory-freeing routines (kfree(), km    1169          memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
1493          vfree(), etc.), whether a live lock     1170          vfree(), etc.), whether a live lock is incorrectly reinitialized via
1494          spin_lock_init()/mutex_init()/etc.,     1171          spin_lock_init()/mutex_init()/etc., or whether there is any lock
1495          held during task exit.                  1172          held during task exit.
1496                                                  1173 
1497 config LOCKDEP                                   1174 config LOCKDEP
1498         bool                                     1175         bool
1499         depends on DEBUG_KERNEL && LOCK_DEBUG    1176         depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1500         select STACKTRACE                        1177         select STACKTRACE
                                                   >> 1178         select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !X86
1501         select KALLSYMS                          1179         select KALLSYMS
1502         select KALLSYMS_ALL                      1180         select KALLSYMS_ALL
1503                                                  1181 
1504 config LOCKDEP_SMALL                             1182 config LOCKDEP_SMALL
1505         bool                                     1183         bool
1506                                                  1184 
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                             1185 config DEBUG_LOCKDEP
1548         bool "Lock dependency engine debuggin    1186         bool "Lock dependency engine debugging"
1549         depends on DEBUG_KERNEL && LOCKDEP       1187         depends on DEBUG_KERNEL && LOCKDEP
1550         select DEBUG_IRQFLAGS                 << 
1551         help                                     1188         help
1552           If you say Y here, the lock depende    1189           If you say Y here, the lock dependency engine will do
1553           additional runtime checks to debug     1190           additional runtime checks to debug itself, at the price
1554           of more runtime overhead.              1191           of more runtime overhead.
1555                                                  1192 
1556 config DEBUG_ATOMIC_SLEEP                        1193 config DEBUG_ATOMIC_SLEEP
1557         bool "Sleep inside atomic section che    1194         bool "Sleep inside atomic section checking"
1558         select PREEMPT_COUNT                     1195         select PREEMPT_COUNT
1559         depends on DEBUG_KERNEL                  1196         depends on DEBUG_KERNEL
1560         depends on !ARCH_NO_PREEMPT              1197         depends on !ARCH_NO_PREEMPT
1561         help                                     1198         help
1562           If you say Y here, various routines    1199           If you say Y here, various routines which may sleep will become very
1563           noisy if they are called inside ato    1200           noisy if they are called inside atomic sections: when a spinlock is
1564           held, inside an rcu read side criti    1201           held, inside an rcu read side critical section, inside preempt disabled
1565           sections, inside an interrupt, etc.    1202           sections, inside an interrupt, etc...
1566                                                  1203 
1567 config DEBUG_LOCKING_API_SELFTESTS               1204 config DEBUG_LOCKING_API_SELFTESTS
1568         bool "Locking API boot-time self-test    1205         bool "Locking API boot-time self-tests"
1569         depends on DEBUG_KERNEL                  1206         depends on DEBUG_KERNEL
1570         help                                     1207         help
1571           Say Y here if you want the kernel t    1208           Say Y here if you want the kernel to run a short self-test during
1572           bootup. The self-test checks whethe    1209           bootup. The self-test checks whether common types of locking bugs
1573           are detected by debugging mechanism    1210           are detected by debugging mechanisms or not. (if you disable
1574           lock debugging then those bugs won' !! 1211           lock debugging then those bugs wont be detected of course.)
1575           The following locking APIs are cove    1212           The following locking APIs are covered: spinlocks, rwlocks,
1576           mutexes and rwsems.                    1213           mutexes and rwsems.
1577                                                  1214 
1578 config LOCK_TORTURE_TEST                         1215 config LOCK_TORTURE_TEST
1579         tristate "torture tests for locking"     1216         tristate "torture tests for locking"
1580         depends on DEBUG_KERNEL                  1217         depends on DEBUG_KERNEL
1581         select TORTURE_TEST                      1218         select TORTURE_TEST
1582         help                                     1219         help
1583           This option provides a kernel modul    1220           This option provides a kernel module that runs torture tests
1584           on kernel locking primitives.  The     1221           on kernel locking primitives.  The kernel module may be built
1585           after the fact on the running kerne    1222           after the fact on the running kernel to be tested, if desired.
1586                                                  1223 
1587           Say Y here if you want kernel locki    1224           Say Y here if you want kernel locking-primitive torture tests
1588           to be built into the kernel.           1225           to be built into the kernel.
1589           Say M if you want these torture tes    1226           Say M if you want these torture tests to build as a module.
1590           Say N if you are unsure.               1227           Say N if you are unsure.
1591                                                  1228 
1592 config WW_MUTEX_SELFTEST                         1229 config WW_MUTEX_SELFTEST
1593         tristate "Wait/wound mutex selftests"    1230         tristate "Wait/wound mutex selftests"
1594         help                                     1231         help
1595           This option provides a kernel modul    1232           This option provides a kernel module that runs tests on the
1596           on the struct ww_mutex locking API.    1233           on the struct ww_mutex locking API.
1597                                                  1234 
1598           It is recommended to enable DEBUG_W    1235           It is recommended to enable DEBUG_WW_MUTEX_SLOWPATH in conjunction
1599           with this test harness.                1236           with this test harness.
1600                                                  1237 
1601           Say M if you want these self tests     1238           Say M if you want these self tests to build as a module.
1602           Say N if you are unsure.               1239           Say N if you are unsure.
1603                                                  1240 
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                         1241 endmenu # lock debugging
1635                                                  1242 
1636 config TRACE_IRQFLAGS                            1243 config TRACE_IRQFLAGS
1637         depends on TRACE_IRQFLAGS_SUPPORT     << 
1638         bool                                     1244         bool
1639         help                                     1245         help
1640           Enables hooks to interrupt enabling    1246           Enables hooks to interrupt enabling and disabling for
1641           either tracing or lock debugging.      1247           either tracing or lock debugging.
1642                                                  1248 
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                                1249 config STACKTRACE
1667         bool "Stack backtrace support"           1250         bool "Stack backtrace support"
1668         depends on STACKTRACE_SUPPORT            1251         depends on STACKTRACE_SUPPORT
1669         help                                     1252         help
1670           This option causes the kernel to cr    1253           This option causes the kernel to create a /proc/pid/stack for
1671           every process, showing its current     1254           every process, showing its current stack trace.
1672           It is also used by various kernel d    1255           It is also used by various kernel debugging features that require
1673           stack trace generation.                1256           stack trace generation.
1674                                                  1257 
1675 config WARN_ALL_UNSEEDED_RANDOM                  1258 config WARN_ALL_UNSEEDED_RANDOM
1676         bool "Warn for all uses of unseeded r    1259         bool "Warn for all uses of unseeded randomness"
1677         default n                                1260         default n
1678         help                                     1261         help
1679           Some parts of the kernel contain bu    1262           Some parts of the kernel contain bugs relating to their use of
1680           cryptographically secure random num    1263           cryptographically secure random numbers before it's actually possible
1681           to generate those numbers securely.    1264           to generate those numbers securely. This setting ensures that these
1682           flaws don't go unnoticed, by enabli    1265           flaws don't go unnoticed, by enabling a message, should this ever
1683           occur. This will allow people with     1266           occur. This will allow people with obscure setups to know when things
1684           are going wrong, so that they might    1267           are going wrong, so that they might contact developers about fixing
1685           it.                                    1268           it.
1686                                                  1269 
1687           Unfortunately, on some models of so    1270           Unfortunately, on some models of some architectures getting
1688           a fully seeded CRNG is extremely di    1271           a fully seeded CRNG is extremely difficult, and so this can
1689           result in dmesg getting spammed for    1272           result in dmesg getting spammed for a surprisingly long
1690           time.  This is really bad from a se    1273           time.  This is really bad from a security perspective, and
1691           so architecture maintainers really     1274           so architecture maintainers really need to do what they can
1692           to get the CRNG seeded sooner after    1275           to get the CRNG seeded sooner after the system is booted.
1693           However, since users cannot do anyt    1276           However, since users cannot do anything actionable to
1694           address this, by default this optio !! 1277           address this, by default the kernel will issue only a single
                                                   >> 1278           warning for the first use of unseeded randomness.
1695                                                  1279 
1696           Say Y here if you want to receive w    1280           Say Y here if you want to receive warnings for all uses of
1697           unseeded randomness.  This will be     1281           unseeded randomness.  This will be of use primarily for
1698           those developers interested in impr    1282           those developers interested in improving the security of
1699           Linux kernels running on their arch    1283           Linux kernels running on their architecture (or
1700           subarchitecture).                      1284           subarchitecture).
1701                                                  1285 
1702 config DEBUG_KOBJECT                             1286 config DEBUG_KOBJECT
1703         bool "kobject debugging"                 1287         bool "kobject debugging"
1704         depends on DEBUG_KERNEL                  1288         depends on DEBUG_KERNEL
1705         help                                     1289         help
1706           If you say Y here, some extra kobje    1290           If you say Y here, some extra kobject debugging messages will be sent
1707           to the syslog.                         1291           to the syslog.
1708                                                  1292 
1709 config DEBUG_KOBJECT_RELEASE                     1293 config DEBUG_KOBJECT_RELEASE
1710         bool "kobject release debugging"         1294         bool "kobject release debugging"
1711         depends on DEBUG_OBJECTS_TIMERS          1295         depends on DEBUG_OBJECTS_TIMERS
1712         help                                     1296         help
1713           kobjects are reference counted obje    1297           kobjects are reference counted objects.  This means that their
1714           last reference count put is not pre    1298           last reference count put is not predictable, and the kobject can
1715           live on past the point at which a d !! 1299           live on past the point at which a driver decides to drop it's
1716           initial reference to the kobject ga    1300           initial reference to the kobject gained on allocation.  An
1717           example of this would be a struct d    1301           example of this would be a struct device which has just been
1718           unregistered.                          1302           unregistered.
1719                                                  1303 
1720           However, some buggy drivers assume     1304           However, some buggy drivers assume that after such an operation,
1721           the memory backing the kobject can     1305           the memory backing the kobject can be immediately freed.  This
1722           goes completely against the princip    1306           goes completely against the principles of a refcounted object.
1723                                                  1307 
1724           If you say Y here, the kernel will     1308           If you say Y here, the kernel will delay the release of kobjects
1725           on the last reference count to impr    1309           on the last reference count to improve the visibility of this
1726           kind of kobject release bug.           1310           kind of kobject release bug.
1727                                                  1311 
1728 config HAVE_DEBUG_BUGVERBOSE                     1312 config HAVE_DEBUG_BUGVERBOSE
1729         bool                                     1313         bool
1730                                                  1314 
1731 menu "Debug kernel data structures"              1315 menu "Debug kernel data structures"
1732                                                  1316 
1733 config DEBUG_LIST                                1317 config DEBUG_LIST
1734         bool "Debug linked list manipulation"    1318         bool "Debug linked list manipulation"
1735         depends on DEBUG_KERNEL               !! 1319         depends on DEBUG_KERNEL || BUG_ON_DATA_CORRUPTION
1736         select LIST_HARDENED                  << 
1737         help                                     1320         help
1738           Enable this to turn on extended che !! 1321           Enable this to turn on extended checks in the linked-list
1739           routines.                           !! 1322           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                                                  1323 
1745           If unsure, say N.                      1324           If unsure, say N.
1746                                                  1325 
1747 config DEBUG_PLIST                               1326 config DEBUG_PLIST
1748         bool "Debug priority linked list mani    1327         bool "Debug priority linked list manipulation"
1749         depends on DEBUG_KERNEL                  1328         depends on DEBUG_KERNEL
1750         help                                     1329         help
1751           Enable this to turn on extended che    1330           Enable this to turn on extended checks in the priority-ordered
1752           linked-list (plist) walking routine    1331           linked-list (plist) walking routines.  This checks the entire
1753           list multiple times during each man    1332           list multiple times during each manipulation.
1754                                                  1333 
1755           If unsure, say N.                      1334           If unsure, say N.
1756                                                  1335 
1757 config DEBUG_SG                                  1336 config DEBUG_SG
1758         bool "Debug SG table operations"         1337         bool "Debug SG table operations"
1759         depends on DEBUG_KERNEL                  1338         depends on DEBUG_KERNEL
1760         help                                     1339         help
1761           Enable this to turn on checks on sc    1340           Enable this to turn on checks on scatter-gather tables. This can
1762           help find problems with drivers tha    1341           help find problems with drivers that do not properly initialize
1763           their sg tables.                       1342           their sg tables.
1764                                                  1343 
1765           If unsure, say N.                      1344           If unsure, say N.
1766                                                  1345 
1767 config DEBUG_NOTIFIERS                           1346 config DEBUG_NOTIFIERS
1768         bool "Debug notifier call chains"        1347         bool "Debug notifier call chains"
1769         depends on DEBUG_KERNEL                  1348         depends on DEBUG_KERNEL
1770         help                                     1349         help
1771           Enable this to turn on sanity check    1350           Enable this to turn on sanity checking for notifier call chains.
1772           This is most useful for kernel deve    1351           This is most useful for kernel developers to make sure that
1773           modules properly unregister themsel    1352           modules properly unregister themselves from notifier chains.
1774           This is a relatively cheap check bu    1353           This is a relatively cheap check but if you care about maximum
1775           performance, say N.                    1354           performance, say N.
1776                                                  1355 
1777 config DEBUG_CLOSURES                         !! 1356 config BUG_ON_DATA_CORRUPTION
1778         bool "Debug closures (bcache async wi !! 1357         bool "Trigger a BUG when data corruption is detected"
1779         depends on CLOSURES                   !! 1358         select DEBUG_LIST
1780         select DEBUG_FS                       !! 1359         help
1781         help                                  !! 1360           Select this option if the kernel should BUG when it encounters
1782           Keeps all active closures in a link !! 1361           data corruption in kernel memory structures when they get checked
1783           interface to list them, which makes !! 1362           for validity.
1784           operations that get stuck.          << 
1785                                                  1363 
1786 config DEBUG_MAPLE_TREE                       !! 1364           If unsure, say N.
1787         bool "Debug maple trees"              !! 1365 
                                                   >> 1366 endmenu
                                                   >> 1367 
                                                   >> 1368 config DEBUG_CREDENTIALS
                                                   >> 1369         bool "Debug credential management"
1788         depends on DEBUG_KERNEL                  1370         depends on DEBUG_KERNEL
1789         help                                     1371         help
1790           Enable maple tree debugging informa !! 1372           Enable this to turn on some debug checking for credential
                                                   >> 1373           management.  The additional code keeps track of the number of
                                                   >> 1374           pointers from task_structs to any given cred struct, and checks to
                                                   >> 1375           see that this number never exceeds the usage count of the cred
                                                   >> 1376           struct.
1791                                                  1377 
1792           If unsure, say N.                   !! 1378           Furthermore, if SELinux is enabled, this also checks that the
                                                   >> 1379           security pointer in the cred struct is never seen to be invalid.
1793                                                  1380 
1794 endmenu                                       !! 1381           If unsure, say N.
1795                                                  1382 
1796 source "kernel/rcu/Kconfig.debug"                1383 source "kernel/rcu/Kconfig.debug"
1797                                                  1384 
1798 config DEBUG_WQ_FORCE_RR_CPU                     1385 config DEBUG_WQ_FORCE_RR_CPU
1799         bool "Force round-robin CPU selection    1386         bool "Force round-robin CPU selection for unbound work items"
1800         depends on DEBUG_KERNEL                  1387         depends on DEBUG_KERNEL
1801         default n                                1388         default n
1802         help                                     1389         help
1803           Workqueue used to implicitly guaran    1390           Workqueue used to implicitly guarantee that work items queued
1804           without explicit CPU specified are     1391           without explicit CPU specified are put on the local CPU.  This
1805           guarantee is no longer true and whi    1392           guarantee is no longer true and while local CPU is still
1806           preferred work items may be put on     1393           preferred work items may be put on foreign CPUs.  Kernel
1807           parameter "workqueue.debug_force_rr    1394           parameter "workqueue.debug_force_rr_cpu" is added to force
1808           round-robin CPU selection to flush     1395           round-robin CPU selection to flush out usages which depend on the
1809           now broken guarantee.  This config     1396           now broken guarantee.  This config option enables the debug
1810           feature by default.  When enabled,     1397           feature by default.  When enabled, memory and cache locality will
1811           be impacted.                           1398           be impacted.
1812                                                  1399 
                                                   >> 1400 config DEBUG_BLOCK_EXT_DEVT
                                                   >> 1401         bool "Force extended block device numbers and spread them"
                                                   >> 1402         depends on DEBUG_KERNEL
                                                   >> 1403         depends on BLOCK
                                                   >> 1404         default n
                                                   >> 1405         help
                                                   >> 1406           BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
                                                   >> 1407           SOME DISTRIBUTIONS.  DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
                                                   >> 1408           YOU ARE DOING.  Distros, please enable this and fix whatever
                                                   >> 1409           is broken.
                                                   >> 1410 
                                                   >> 1411           Conventionally, block device numbers are allocated from
                                                   >> 1412           predetermined contiguous area.  However, extended block area
                                                   >> 1413           may introduce non-contiguous block device numbers.  This
                                                   >> 1414           option forces most block device numbers to be allocated from
                                                   >> 1415           the extended space and spreads them to discover kernel or
                                                   >> 1416           userland code paths which assume predetermined contiguous
                                                   >> 1417           device number allocation.
                                                   >> 1418 
                                                   >> 1419           Note that turning on this debug option shuffles all the
                                                   >> 1420           device numbers for all IDE and SCSI devices including libata
                                                   >> 1421           ones, so root partition specified using device number
                                                   >> 1422           directly (via rdev or root=MAJ:MIN) won't work anymore.
                                                   >> 1423           Textual device names (root=/dev/sdXn) will continue to work.
                                                   >> 1424 
                                                   >> 1425           Say N if you are unsure.
                                                   >> 1426 
1813 config CPU_HOTPLUG_STATE_CONTROL                 1427 config CPU_HOTPLUG_STATE_CONTROL
1814         bool "Enable CPU hotplug state contro    1428         bool "Enable CPU hotplug state control"
1815         depends on DEBUG_KERNEL                  1429         depends on DEBUG_KERNEL
1816         depends on HOTPLUG_CPU                   1430         depends on HOTPLUG_CPU
1817         default n                                1431         default n
1818         help                                     1432         help
1819           Allows to write steps between "offl    1433           Allows to write steps between "offline" and "online" to the CPUs
1820           sysfs target file so states can be     1434           sysfs target file so states can be stepped granular. This is a debug
1821           option for now as the hotplug machi    1435           option for now as the hotplug machinery cannot be stopped and
1822           restarted at arbitrary points yet.     1436           restarted at arbitrary points yet.
1823                                                  1437 
1824           Say N if your are unsure.              1438           Say N if your are unsure.
1825                                                  1439 
1826 config LATENCYTOP                                1440 config LATENCYTOP
1827         bool "Latency measuring infrastructur    1441         bool "Latency measuring infrastructure"
1828         depends on DEBUG_KERNEL                  1442         depends on DEBUG_KERNEL
1829         depends on STACKTRACE_SUPPORT            1443         depends on STACKTRACE_SUPPORT
1830         depends on PROC_FS                       1444         depends on PROC_FS
1831         depends on FRAME_POINTER || MIPS || P !! 1445         select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
1832         select KALLSYMS                          1446         select KALLSYMS
1833         select KALLSYMS_ALL                      1447         select KALLSYMS_ALL
1834         select STACKTRACE                        1448         select STACKTRACE
1835         select SCHEDSTATS                        1449         select SCHEDSTATS
                                                   >> 1450         select SCHED_DEBUG
1836         help                                     1451         help
1837           Enable this option if you want to u    1452           Enable this option if you want to use the LatencyTOP tool
1838           to find out which userspace is bloc    1453           to find out which userspace is blocking on what kernel operations.
1839                                                  1454 
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"                    1455 source "kernel/trace/Kconfig"
1851                                                  1456 
1852 config PROVIDE_OHCI1394_DMA_INIT                 1457 config PROVIDE_OHCI1394_DMA_INIT
1853         bool "Remote debugging over FireWire     1458         bool "Remote debugging over FireWire early on boot"
1854         depends on PCI && X86                    1459         depends on PCI && X86
1855         help                                     1460         help
1856           If you want to debug problems which    1461           If you want to debug problems which hang or crash the kernel early
1857           on boot and the crashing machine ha    1462           on boot and the crashing machine has a FireWire port, you can use
1858           this feature to remotely access the    1463           this feature to remotely access the memory of the crashed machine
1859           over FireWire. This employs remote     1464           over FireWire. This employs remote DMA as part of the OHCI1394
1860           specification which is now the stan    1465           specification which is now the standard for FireWire controllers.
1861                                                  1466 
1862           With remote DMA, you can monitor th    1467           With remote DMA, you can monitor the printk buffer remotely using
1863           firescope and access all memory bel    1468           firescope and access all memory below 4GB using fireproxy from gdb.
1864           Even controlling a kernel debugger     1469           Even controlling a kernel debugger is possible using remote DMA.
1865                                                  1470 
1866           Usage:                                 1471           Usage:
1867                                                  1472 
1868           If ohci1394_dma=early is used as bo    1473           If ohci1394_dma=early is used as boot parameter, it will initialize
1869           all OHCI1394 controllers which are     1474           all OHCI1394 controllers which are found in the PCI config space.
1870                                                  1475 
1871           As all changes to the FireWire bus     1476           As all changes to the FireWire bus such as enabling and disabling
1872           devices cause a bus reset and there    1477           devices cause a bus reset and thereby disable remote DMA for all
1873           devices, be sure to have the cable     1478           devices, be sure to have the cable plugged and FireWire enabled on
1874           the debugging host before booting t    1479           the debugging host before booting the debug target for debugging.
1875                                                  1480 
1876           This code (~1k) is freed after boot    1481           This code (~1k) is freed after boot. By then, the firewire stack
1877           in charge of the OHCI-1394 controll    1482           in charge of the OHCI-1394 controllers should be used instead.
1878                                                  1483 
1879           See Documentation/core-api/debuggin !! 1484           See Documentation/debugging-via-ohci1394.txt for more information.
1880                                                  1485 
1881 source "samples/Kconfig"                         1486 source "samples/Kconfig"
1882                                                  1487 
1883 config ARCH_HAS_DEVMEM_IS_ALLOWED                1488 config ARCH_HAS_DEVMEM_IS_ALLOWED
1884         bool                                     1489         bool
1885                                                  1490 
1886 config STRICT_DEVMEM                             1491 config STRICT_DEVMEM
1887         bool "Filter access to /dev/mem"         1492         bool "Filter access to /dev/mem"
1888         depends on MMU && DEVMEM                 1493         depends on MMU && DEVMEM
1889         depends on ARCH_HAS_DEVMEM_IS_ALLOWED !! 1494         depends on ARCH_HAS_DEVMEM_IS_ALLOWED
1890         default y if PPC || X86 || ARM64         1495         default y if PPC || X86 || ARM64
1891         help                                     1496         help
1892           If this option is disabled, you all    1497           If this option is disabled, you allow userspace (root) access to all
1893           of memory, including kernel and use    1498           of memory, including kernel and userspace memory. Accidental
1894           access to this is obviously disastr    1499           access to this is obviously disastrous, but specific access can
1895           be used by people debugging the ker    1500           be used by people debugging the kernel. Note that with PAT support
1896           enabled, even in this case there ar    1501           enabled, even in this case there are restrictions on /dev/mem
1897           use due to the cache aliasing requi    1502           use due to the cache aliasing requirements.
1898                                                  1503 
1899           If this option is switched on, and     1504           If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
1900           file only allows userspace access t    1505           file only allows userspace access to PCI space and the BIOS code and
1901           data regions.  This is sufficient f    1506           data regions.  This is sufficient for dosemu and X and all common
1902           users of /dev/mem.                     1507           users of /dev/mem.
1903                                                  1508 
1904           If in doubt, say Y.                    1509           If in doubt, say Y.
1905                                                  1510 
1906 config IO_STRICT_DEVMEM                          1511 config IO_STRICT_DEVMEM
1907         bool "Filter I/O access to /dev/mem"     1512         bool "Filter I/O access to /dev/mem"
1908         depends on STRICT_DEVMEM                 1513         depends on STRICT_DEVMEM
1909         help                                     1514         help
1910           If this option is disabled, you all    1515           If this option is disabled, you allow userspace (root) access to all
1911           io-memory regardless of whether a d    1516           io-memory regardless of whether a driver is actively using that
1912           range.  Accidental access to this i    1517           range.  Accidental access to this is obviously disastrous, but
1913           specific access can be used by peop    1518           specific access can be used by people debugging kernel drivers.
1914                                                  1519 
1915           If this option is switched on, the     1520           If this option is switched on, the /dev/mem file only allows
1916           userspace access to *idle* io-memor    1521           userspace access to *idle* io-memory ranges (see /proc/iomem) This
1917           may break traditional users of /dev    1522           may break traditional users of /dev/mem (dosemu, legacy X, etc...)
1918           if the driver using a given range c    1523           if the driver using a given range cannot be disabled.
1919                                                  1524 
1920           If in doubt, say Y.                    1525           If in doubt, say Y.
1921                                                  1526 
1922 menu "$(SRCARCH) Debugging"                      1527 menu "$(SRCARCH) Debugging"
1923                                                  1528 
1924 source "arch/$(SRCARCH)/Kconfig.debug"           1529 source "arch/$(SRCARCH)/Kconfig.debug"
1925                                                  1530 
1926 endmenu                                          1531 endmenu
1927                                                  1532 
1928 menu "Kernel Testing and Coverage"               1533 menu "Kernel Testing and Coverage"
1929                                                  1534 
1930 source "lib/kunit/Kconfig"                       1535 source "lib/kunit/Kconfig"
1931                                                  1536 
1932 config NOTIFIER_ERROR_INJECTION                  1537 config NOTIFIER_ERROR_INJECTION
1933         tristate "Notifier error injection"      1538         tristate "Notifier error injection"
1934         depends on DEBUG_KERNEL                  1539         depends on DEBUG_KERNEL
1935         select DEBUG_FS                          1540         select DEBUG_FS
1936         help                                     1541         help
1937           This option provides the ability to    1542           This option provides the ability to inject artificial errors to
1938           specified notifier chain callbacks.    1543           specified notifier chain callbacks. It is useful to test the error
1939           handling of notifier call chain fai    1544           handling of notifier call chain failures.
1940                                                  1545 
1941           Say N if unsure.                       1546           Say N if unsure.
1942                                                  1547 
1943 config PM_NOTIFIER_ERROR_INJECT                  1548 config PM_NOTIFIER_ERROR_INJECT
1944         tristate "PM notifier error injection    1549         tristate "PM notifier error injection module"
1945         depends on PM && NOTIFIER_ERROR_INJEC    1550         depends on PM && NOTIFIER_ERROR_INJECTION
1946         default m if PM_DEBUG                    1551         default m if PM_DEBUG
1947         help                                     1552         help
1948           This option provides the ability to    1553           This option provides the ability to inject artificial errors to
1949           PM notifier chain callbacks.  It is    1554           PM notifier chain callbacks.  It is controlled through debugfs
1950           interface /sys/kernel/debug/notifie    1555           interface /sys/kernel/debug/notifier-error-inject/pm
1951                                                  1556 
1952           If the notifier call chain should b    1557           If the notifier call chain should be failed with some events
1953           notified, write the error code to "    1558           notified, write the error code to "actions/<notifier event>/error".
1954                                                  1559 
1955           Example: Inject PM suspend error (-    1560           Example: Inject PM suspend error (-12 = -ENOMEM)
1956                                                  1561 
1957           # cd /sys/kernel/debug/notifier-err    1562           # cd /sys/kernel/debug/notifier-error-inject/pm/
1958           # echo -12 > actions/PM_SUSPEND_PRE    1563           # echo -12 > actions/PM_SUSPEND_PREPARE/error
1959           # echo mem > /sys/power/state          1564           # echo mem > /sys/power/state
1960           bash: echo: write error: Cannot all    1565           bash: echo: write error: Cannot allocate memory
1961                                                  1566 
1962           To compile this code as a module, c    1567           To compile this code as a module, choose M here: the module will
1963           be called pm-notifier-error-inject.    1568           be called pm-notifier-error-inject.
1964                                                  1569 
1965           If unsure, say N.                      1570           If unsure, say N.
1966                                                  1571 
1967 config OF_RECONFIG_NOTIFIER_ERROR_INJECT         1572 config OF_RECONFIG_NOTIFIER_ERROR_INJECT
1968         tristate "OF reconfig notifier error     1573         tristate "OF reconfig notifier error injection module"
1969         depends on OF_DYNAMIC && NOTIFIER_ERR    1574         depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
1970         help                                     1575         help
1971           This option provides the ability to    1576           This option provides the ability to inject artificial errors to
1972           OF reconfig notifier chain callback    1577           OF reconfig notifier chain callbacks.  It is controlled
1973           through debugfs interface under        1578           through debugfs interface under
1974           /sys/kernel/debug/notifier-error-in    1579           /sys/kernel/debug/notifier-error-inject/OF-reconfig/
1975                                                  1580 
1976           If the notifier call chain should b    1581           If the notifier call chain should be failed with some events
1977           notified, write the error code to "    1582           notified, write the error code to "actions/<notifier event>/error".
1978                                                  1583 
1979           To compile this code as a module, c    1584           To compile this code as a module, choose M here: the module will
1980           be called of-reconfig-notifier-erro    1585           be called of-reconfig-notifier-error-inject.
1981                                                  1586 
1982           If unsure, say N.                      1587           If unsure, say N.
1983                                                  1588 
1984 config NETDEV_NOTIFIER_ERROR_INJECT              1589 config NETDEV_NOTIFIER_ERROR_INJECT
1985         tristate "Netdev notifier error injec    1590         tristate "Netdev notifier error injection module"
1986         depends on NET && NOTIFIER_ERROR_INJE    1591         depends on NET && NOTIFIER_ERROR_INJECTION
1987         help                                     1592         help
1988           This option provides the ability to    1593           This option provides the ability to inject artificial errors to
1989           netdevice notifier chain callbacks.    1594           netdevice notifier chain callbacks.  It is controlled through debugfs
1990           interface /sys/kernel/debug/notifie    1595           interface /sys/kernel/debug/notifier-error-inject/netdev
1991                                                  1596 
1992           If the notifier call chain should b    1597           If the notifier call chain should be failed with some events
1993           notified, write the error code to "    1598           notified, write the error code to "actions/<notifier event>/error".
1994                                                  1599 
1995           Example: Inject netdevice mtu chang    1600           Example: Inject netdevice mtu change error (-22 = -EINVAL)
1996                                                  1601 
1997           # cd /sys/kernel/debug/notifier-err    1602           # cd /sys/kernel/debug/notifier-error-inject/netdev
1998           # echo -22 > actions/NETDEV_CHANGEM    1603           # echo -22 > actions/NETDEV_CHANGEMTU/error
1999           # ip link set eth0 mtu 1024            1604           # ip link set eth0 mtu 1024
2000           RTNETLINK answers: Invalid argument    1605           RTNETLINK answers: Invalid argument
2001                                                  1606 
2002           To compile this code as a module, c    1607           To compile this code as a module, choose M here: the module will
2003           be called netdev-notifier-error-inj    1608           be called netdev-notifier-error-inject.
2004                                                  1609 
2005           If unsure, say N.                      1610           If unsure, say N.
2006                                                  1611 
2007 config FUNCTION_ERROR_INJECTION                  1612 config FUNCTION_ERROR_INJECTION
2008         bool "Fault-injections of functions"  !! 1613         def_bool y
2009         depends on HAVE_FUNCTION_ERROR_INJECT    1614         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                                                  1615 
2017 config FAULT_INJECTION                           1616 config FAULT_INJECTION
2018         bool "Fault-injection framework"         1617         bool "Fault-injection framework"
2019         depends on DEBUG_KERNEL                  1618         depends on DEBUG_KERNEL
2020         help                                     1619         help
2021           Provide fault-injection framework.     1620           Provide fault-injection framework.
2022           For more details, see Documentation    1621           For more details, see Documentation/fault-injection/.
2023                                                  1622 
2024 config FAILSLAB                                  1623 config FAILSLAB
2025         bool "Fault-injection capability for     1624         bool "Fault-injection capability for kmalloc"
2026         depends on FAULT_INJECTION               1625         depends on FAULT_INJECTION
                                                   >> 1626         depends on SLAB || SLUB
2027         help                                     1627         help
2028           Provide fault-injection capability     1628           Provide fault-injection capability for kmalloc.
2029                                                  1629 
2030 config FAIL_PAGE_ALLOC                           1630 config FAIL_PAGE_ALLOC
2031         bool "Fault-injection capability for  !! 1631         bool "Fault-injection capabilitiy for alloc_pages()"
2032         depends on FAULT_INJECTION               1632         depends on FAULT_INJECTION
2033         help                                     1633         help
2034           Provide fault-injection capability     1634           Provide fault-injection capability for alloc_pages().
2035                                                  1635 
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                         1636 config FAIL_MAKE_REQUEST
2044         bool "Fault-injection capability for     1637         bool "Fault-injection capability for disk IO"
2045         depends on FAULT_INJECTION && BLOCK      1638         depends on FAULT_INJECTION && BLOCK
2046         help                                     1639         help
2047           Provide fault-injection capability     1640           Provide fault-injection capability for disk IO.
2048                                                  1641 
2049 config FAIL_IO_TIMEOUT                           1642 config FAIL_IO_TIMEOUT
2050         bool "Fault-injection capability for     1643         bool "Fault-injection capability for faking disk interrupts"
2051         depends on FAULT_INJECTION && BLOCK      1644         depends on FAULT_INJECTION && BLOCK
2052         help                                     1645         help
2053           Provide fault-injection capability     1646           Provide fault-injection capability on end IO handling. This
2054           will make the block layer "forget"     1647           will make the block layer "forget" an interrupt as configured,
2055           thus exercising the error handling.    1648           thus exercising the error handling.
2056                                                  1649 
2057           Only works with drivers that use th    1650           Only works with drivers that use the generic timeout handling,
2058           for others it won't do anything.    !! 1651           for others it wont do anything.
2059                                                  1652 
2060 config FAIL_FUTEX                                1653 config FAIL_FUTEX
2061         bool "Fault-injection capability for     1654         bool "Fault-injection capability for futexes"
2062         select DEBUG_FS                          1655         select DEBUG_FS
2063         depends on FAULT_INJECTION && FUTEX      1656         depends on FAULT_INJECTION && FUTEX
2064         help                                     1657         help
2065           Provide fault-injection capability     1658           Provide fault-injection capability for futexes.
2066                                                  1659 
2067 config FAULT_INJECTION_DEBUG_FS                  1660 config FAULT_INJECTION_DEBUG_FS
2068         bool "Debugfs entries for fault-injec    1661         bool "Debugfs entries for fault-injection capabilities"
2069         depends on FAULT_INJECTION && SYSFS &    1662         depends on FAULT_INJECTION && SYSFS && DEBUG_FS
2070         help                                     1663         help
2071           Enable configuration of fault-injec    1664           Enable configuration of fault-injection capabilities via debugfs.
2072                                                  1665 
2073 config FAIL_FUNCTION                             1666 config FAIL_FUNCTION
2074         bool "Fault-injection capability for     1667         bool "Fault-injection capability for functions"
2075         depends on FAULT_INJECTION_DEBUG_FS &    1668         depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
2076         help                                     1669         help
2077           Provide function-based fault-inject    1670           Provide function-based fault-injection capability.
2078           This will allow you to override a s    1671           This will allow you to override a specific function with a return
2079           with given return value. As a resul    1672           with given return value. As a result, function caller will see
2080           an error value and have to handle i    1673           an error value and have to handle it. This is useful to test the
2081           error handling in various subsystem    1674           error handling in various subsystems.
2082                                                  1675 
2083 config FAIL_MMC_REQUEST                          1676 config FAIL_MMC_REQUEST
2084         bool "Fault-injection capability for     1677         bool "Fault-injection capability for MMC IO"
2085         depends on FAULT_INJECTION_DEBUG_FS &    1678         depends on FAULT_INJECTION_DEBUG_FS && MMC
2086         help                                     1679         help
2087           Provide fault-injection capability     1680           Provide fault-injection capability for MMC IO.
2088           This will make the mmc core return     1681           This will make the mmc core return data errors. This is
2089           useful to test the error handling i    1682           useful to test the error handling in the mmc block device
2090           and to test how the mmc host driver    1683           and to test how the mmc host driver handles retries from
2091           the block device.                      1684           the block device.
2092                                                  1685 
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         1686 config FAULT_INJECTION_STACKTRACE_FILTER
2112         bool "stacktrace filter for fault-inj    1687         bool "stacktrace filter for fault-injection capabilities"
2113         depends on FAULT_INJECTION            !! 1688         depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
2114         depends on (FAULT_INJECTION_DEBUG_FS  !! 1689         depends on !X86_64
2115         select STACKTRACE                        1690         select STACKTRACE
2116         depends on FRAME_POINTER || MIPS || P !! 1691         select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
2117         help                                     1692         help
2118           Provide stacktrace filter for fault    1693           Provide stacktrace filter for fault-injection capabilities
2119                                                  1694 
2120 config ARCH_HAS_KCOV                             1695 config ARCH_HAS_KCOV
2121         bool                                     1696         bool
2122         help                                     1697         help
2123           An architecture should select this     1698           An architecture should select this when it can successfully
2124           build and run with CONFIG_KCOV. Thi    1699           build and run with CONFIG_KCOV. This typically requires
2125           disabling instrumentation for some     1700           disabling instrumentation for some early boot code.
2126                                                  1701 
2127 config CC_HAS_SANCOV_TRACE_PC                    1702 config CC_HAS_SANCOV_TRACE_PC
2128         def_bool $(cc-option,-fsanitize-cover    1703         def_bool $(cc-option,-fsanitize-coverage=trace-pc)
2129                                                  1704 
2130                                                  1705 
2131 config KCOV                                      1706 config KCOV
2132         bool "Code coverage for fuzzing"         1707         bool "Code coverage for fuzzing"
2133         depends on ARCH_HAS_KCOV                 1708         depends on ARCH_HAS_KCOV
2134         depends on CC_HAS_SANCOV_TRACE_PC ||     1709         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                          1710         select DEBUG_FS
2138         select GCC_PLUGIN_SANCOV if !CC_HAS_S    1711         select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
2139         select OBJTOOL if HAVE_NOINSTR_HACK   << 
2140         help                                     1712         help
2141           KCOV exposes kernel code coverage i    1713           KCOV exposes kernel code coverage information in a form suitable
2142           for coverage-guided fuzzing (random    1714           for coverage-guided fuzzing (randomized testing).
2143                                                  1715 
                                                   >> 1716           If RANDOMIZE_BASE is enabled, PC values will not be stable across
                                                   >> 1717           different machines and across reboots. If you need stable PC values,
                                                   >> 1718           disable RANDOMIZE_BASE.
                                                   >> 1719 
2144           For more details, see Documentation    1720           For more details, see Documentation/dev-tools/kcov.rst.
2145                                                  1721 
2146 config KCOV_ENABLE_COMPARISONS                   1722 config KCOV_ENABLE_COMPARISONS
2147         bool "Enable comparison operands coll    1723         bool "Enable comparison operands collection by KCOV"
2148         depends on KCOV                          1724         depends on KCOV
2149         depends on $(cc-option,-fsanitize-cov    1725         depends on $(cc-option,-fsanitize-coverage=trace-cmp)
2150         help                                     1726         help
2151           KCOV also exposes operands of every    1727           KCOV also exposes operands of every comparison in the instrumented
2152           code along with operand sizes and P    1728           code along with operand sizes and PCs of the comparison instructions.
2153           These operands can be used by fuzzi    1729           These operands can be used by fuzzing engines to improve the quality
2154           of fuzzing coverage.                   1730           of fuzzing coverage.
2155                                                  1731 
2156 config KCOV_INSTRUMENT_ALL                       1732 config KCOV_INSTRUMENT_ALL
2157         bool "Instrument all code by default"    1733         bool "Instrument all code by default"
2158         depends on KCOV                          1734         depends on KCOV
2159         default y                                1735         default y
2160         help                                     1736         help
2161           If you are doing generic system cal    1737           If you are doing generic system call fuzzing (like e.g. syzkaller),
2162           then you will want to instrument th    1738           then you will want to instrument the whole kernel and you should
2163           say y here. If you are doing more t    1739           say y here. If you are doing more targeted fuzzing (like e.g.
2164           filesystem fuzzing with AFL) then y    1740           filesystem fuzzing with AFL) then you will want to enable coverage
2165           for more specific subsets of files,    1741           for more specific subsets of files, and should say n here.
2166                                                  1742 
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                  1743 menuconfig RUNTIME_TESTING_MENU
2177         bool "Runtime Testing"                   1744         bool "Runtime Testing"
2178         default y                             !! 1745         def_bool y
2179                                                  1746 
2180 if RUNTIME_TESTING_MENU                          1747 if RUNTIME_TESTING_MENU
2181                                                  1748 
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                                     1749 config LKDTM
2218         tristate "Linux Kernel Dump Test Tool    1750         tristate "Linux Kernel Dump Test Tool Module"
2219         depends on DEBUG_FS                      1751         depends on DEBUG_FS
2220         help                                     1752         help
2221         This module enables testing of the di    1753         This module enables testing of the different dumping mechanisms by
2222         inducing system failures at predefine    1754         inducing system failures at predefined crash points.
2223         If you don't need it: say N              1755         If you don't need it: say N
2224         Choose M here to compile this code as    1756         Choose M here to compile this code as a module. The module will be
2225         called lkdtm.                            1757         called lkdtm.
2226                                                  1758 
2227         Documentation on how to use the modul    1759         Documentation on how to use the module can be found in
2228         Documentation/fault-injection/provoke    1760         Documentation/fault-injection/provoke-crashes.rst
2229                                                  1761 
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                            1762 config TEST_LIST_SORT
2243         tristate "Linked list sorting test" i !! 1763         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             1764         depends on DEBUG_KERNEL || m
2256         help                                     1765         help
2257           Enable this to turn on min heap fun !! 1766           Enable this to turn on 'list_sort()' function test. This test is
2258           executed only once during system bo    1767           executed only once during system boot (so affects only boot time),
2259           or at module load time.                1768           or at module load time.
2260                                                  1769 
2261           If unsure, say N.                      1770           If unsure, say N.
2262                                                  1771 
2263 config TEST_SORT                                 1772 config TEST_SORT
2264         tristate "Array-based sort test" if ! !! 1773         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             1774         depends on DEBUG_KERNEL || m
2276         help                                     1775         help
2277           Enable this to turn on 'do_div()' f !! 1776           This option enables the self-test function of 'sort()' at boot,
2278           executed only once during system bo << 
2279           or at module load time.                1777           or at module load time.
2280                                                  1778 
2281           If unsure, say N.                      1779           If unsure, say N.
2282                                                  1780 
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                       1781 config KPROBES_SANITY_TEST
2296         tristate "Kprobes sanity tests" if !K !! 1782         bool "Kprobes sanity tests"
2297         depends on DEBUG_KERNEL                  1783         depends on DEBUG_KERNEL
2298         depends on KPROBES                       1784         depends on KPROBES
2299         depends on KUNIT                      << 
2300         select STACKTRACE if ARCH_CORRECT_STA << 
2301         default KUNIT_ALL_TESTS               << 
2302         help                                     1785         help
2303           This option provides for testing ba    1786           This option provides for testing basic kprobes functionality on
2304           boot. Samples of kprobe and kretpro    1787           boot. Samples of kprobe and kretprobe are inserted and
2305           verified for functionality.            1788           verified for functionality.
2306                                                  1789 
2307           Say N if you are unsure.               1790           Say N if you are unsure.
2308                                                  1791 
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                       1792 config BACKTRACE_SELF_TEST
2322         tristate "Self test for the backtrace    1793         tristate "Self test for the backtrace code"
2323         depends on DEBUG_KERNEL                  1794         depends on DEBUG_KERNEL
2324         help                                     1795         help
2325           This option provides a kernel modul    1796           This option provides a kernel module that can be used to test
2326           the kernel stack backtrace code. Th    1797           the kernel stack backtrace code. This option is not useful
2327           for distributions or general kernel    1798           for distributions or general kernels, but only for kernel
2328           developers working on architecture     1799           developers working on architecture code.
2329                                                  1800 
2330           Note that if you want to also test     1801           Note that if you want to also test saved backtraces, you will
2331           have to enable STACKTRACE as well.     1802           have to enable STACKTRACE as well.
2332                                                  1803 
2333           Say N if you are unsure.               1804           Say N if you are unsure.
2334                                                  1805 
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                               1806 config RBTREE_TEST
2346         tristate "Red-Black tree test"           1807         tristate "Red-Black tree test"
2347         depends on DEBUG_KERNEL                  1808         depends on DEBUG_KERNEL
2348         help                                     1809         help
2349           A benchmark measuring the performan    1810           A benchmark measuring the performance of the rbtree library.
2350           Also includes rbtree invariant chec    1811           Also includes rbtree invariant checks.
2351                                                  1812 
2352 config REED_SOLOMON_TEST                         1813 config REED_SOLOMON_TEST
2353         tristate "Reed-Solomon library test"     1814         tristate "Reed-Solomon library test"
2354         depends on DEBUG_KERNEL || m             1815         depends on DEBUG_KERNEL || m
2355         select REED_SOLOMON                      1816         select REED_SOLOMON
2356         select REED_SOLOMON_ENC16                1817         select REED_SOLOMON_ENC16
2357         select REED_SOLOMON_DEC16                1818         select REED_SOLOMON_DEC16
2358         help                                     1819         help
2359           This option enables the self-test f    1820           This option enables the self-test function of rslib at boot,
2360           or at module load time.                1821           or at module load time.
2361                                                  1822 
2362           If unsure, say N.                      1823           If unsure, say N.
2363                                                  1824 
2364 config INTERVAL_TREE_TEST                        1825 config INTERVAL_TREE_TEST
2365         tristate "Interval tree test"            1826         tristate "Interval tree test"
2366         depends on DEBUG_KERNEL                  1827         depends on DEBUG_KERNEL
2367         select INTERVAL_TREE                     1828         select INTERVAL_TREE
2368         help                                     1829         help
2369           A benchmark measuring the performan    1830           A benchmark measuring the performance of the interval tree library
2370                                                  1831 
2371 config PERCPU_TEST                               1832 config PERCPU_TEST
2372         tristate "Per cpu operations test"       1833         tristate "Per cpu operations test"
2373         depends on m && DEBUG_KERNEL             1834         depends on m && DEBUG_KERNEL
2374         help                                     1835         help
2375           Enable this option to build test mo    1836           Enable this option to build test module which validates per-cpu
2376           operations.                            1837           operations.
2377                                                  1838 
2378           If unsure, say N.                      1839           If unsure, say N.
2379                                                  1840 
2380 config ATOMIC64_SELFTEST                         1841 config ATOMIC64_SELFTEST
2381         tristate "Perform an atomic64_t self-    1842         tristate "Perform an atomic64_t self-test"
2382         help                                     1843         help
2383           Enable this option to test the atom    1844           Enable this option to test the atomic64_t functions at boot or
2384           at module load time.                   1845           at module load time.
2385                                                  1846 
2386           If unsure, say N.                      1847           If unsure, say N.
2387                                                  1848 
2388 config ASYNC_RAID6_TEST                          1849 config ASYNC_RAID6_TEST
2389         tristate "Self test for hardware acce    1850         tristate "Self test for hardware accelerated raid6 recovery"
2390         depends on ASYNC_RAID6_RECOV             1851         depends on ASYNC_RAID6_RECOV
2391         select ASYNC_MEMCPY                      1852         select ASYNC_MEMCPY
2392         help                                  !! 1853         ---help---
2393           This is a one-shot self test that p    1854           This is a one-shot self test that permutes through the
2394           recovery of all the possible two di    1855           recovery of all the possible two disk failure scenarios for a
2395           N-disk array.  Recovery is performe    1856           N-disk array.  Recovery is performed with the asynchronous
2396           raid6 recovery routines, and will o    1857           raid6 recovery routines, and will optionally use an offload
2397           engine if one is available.            1858           engine if one is available.
2398                                                  1859 
2399           If unsure, say N.                      1860           If unsure, say N.
2400                                                  1861 
2401 config TEST_HEXDUMP                              1862 config TEST_HEXDUMP
2402         tristate "Test functions located in t    1863         tristate "Test functions located in the hexdump module at runtime"
2403                                                  1864 
2404 config STRING_KUNIT_TEST                      !! 1865 config TEST_STRING_HELPERS
2405         tristate "KUnit test string functions !! 1866         tristate "Test functions located in the string_helpers module at runtime"
2406         depends on KUNIT                      << 
2407         default KUNIT_ALL_TESTS               << 
2408                                                  1867 
2409 config STRING_HELPERS_KUNIT_TEST              !! 1868 config TEST_STRSCPY
2410         tristate "KUnit test string helpers a !! 1869         tristate "Test strscpy*() family of functions at runtime"
2411         depends on KUNIT                      << 
2412         default KUNIT_ALL_TESTS               << 
2413                                                  1870 
2414 config TEST_KSTRTOX                              1871 config TEST_KSTRTOX
2415         tristate "Test kstrto*() family of fu    1872         tristate "Test kstrto*() family of functions at runtime"
2416                                                  1873 
2417 config TEST_PRINTF                               1874 config TEST_PRINTF
2418         tristate "Test printf() family of fun    1875         tristate "Test printf() family of functions at runtime"
2419                                                  1876 
2420 config TEST_SCANF                             << 
2421         tristate "Test scanf() family of func << 
2422                                               << 
2423 config TEST_BITMAP                               1877 config TEST_BITMAP
2424         tristate "Test bitmap_*() family of f    1878         tristate "Test bitmap_*() family of functions at runtime"
2425         help                                     1879         help
2426           Enable this option to test the bitm    1880           Enable this option to test the bitmap functions at boot.
2427                                                  1881 
2428           If unsure, say N.                      1882           If unsure, say N.
2429                                                  1883 
                                                   >> 1884 config TEST_BITFIELD
                                                   >> 1885         tristate "Test bitfield functions at runtime"
                                                   >> 1886         help
                                                   >> 1887           Enable this option to test the bitfield functions at boot.
                                                   >> 1888 
                                                   >> 1889           If unsure, say N.
                                                   >> 1890 
2430 config TEST_UUID                                 1891 config TEST_UUID
2431         tristate "Test functions located in t    1892         tristate "Test functions located in the uuid module at runtime"
2432                                                  1893 
2433 config TEST_XARRAY                               1894 config TEST_XARRAY
2434         tristate "Test the XArray code at run    1895         tristate "Test the XArray code at runtime"
2435                                                  1896 
2436 config TEST_MAPLE_TREE                        !! 1897 config TEST_OVERFLOW
2437         tristate "Test the Maple Tree code at !! 1898         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                                                  1899 
2445 config TEST_RHASHTABLE                           1900 config TEST_RHASHTABLE
2446         tristate "Perform selftest on resizab    1901         tristate "Perform selftest on resizable hash table"
2447         help                                     1902         help
2448           Enable this option to test the rhas    1903           Enable this option to test the rhashtable functions at boot.
2449                                                  1904 
2450           If unsure, say N.                      1905           If unsure, say N.
2451                                                  1906 
                                                   >> 1907 config TEST_HASH
                                                   >> 1908         tristate "Perform selftest on hash functions"
                                                   >> 1909         help
                                                   >> 1910           Enable this option to test the kernel's integer (<linux/hash.h>),
                                                   >> 1911           string (<linux/stringhash.h>), and siphash (<linux/siphash.h>)
                                                   >> 1912           hash functions on boot (or module load).
                                                   >> 1913 
                                                   >> 1914           This is intended to help people writing architecture-specific
                                                   >> 1915           optimized versions.  If unsure, say N.
                                                   >> 1916 
2452 config TEST_IDA                                  1917 config TEST_IDA
2453         tristate "Perform selftest on IDA fun    1918         tristate "Perform selftest on IDA functions"
2454                                                  1919 
2455 config TEST_PARMAN                               1920 config TEST_PARMAN
2456         tristate "Perform selftest on priorit    1921         tristate "Perform selftest on priority array manager"
2457         depends on PARMAN                        1922         depends on PARMAN
2458         help                                     1923         help
2459           Enable this option to test priority    1924           Enable this option to test priority array manager on boot
2460           (or module load).                      1925           (or module load).
2461                                                  1926 
2462           If unsure, say N.                      1927           If unsure, say N.
2463                                                  1928 
2464 config TEST_IRQ_TIMINGS                          1929 config TEST_IRQ_TIMINGS
2465         bool "IRQ timings selftest"              1930         bool "IRQ timings selftest"
2466         depends on IRQ_TIMINGS                   1931         depends on IRQ_TIMINGS
2467         help                                     1932         help
2468           Enable this option to test the irq     1933           Enable this option to test the irq timings code on boot.
2469                                                  1934 
2470           If unsure, say N.                      1935           If unsure, say N.
2471                                                  1936 
2472 config TEST_LKM                                  1937 config TEST_LKM
2473         tristate "Test module loading with 'h    1938         tristate "Test module loading with 'hello world' module"
2474         depends on m                             1939         depends on m
2475         help                                     1940         help
2476           This builds the "test_module" modul    1941           This builds the "test_module" module that emits "Hello, world"
2477           on printk when loaded. It is design    1942           on printk when loaded. It is designed to be used for basic
2478           evaluation of the module loading su    1943           evaluation of the module loading subsystem (for example when
2479           validating module verification). It    1944           validating module verification). It lacks any extra dependencies,
2480           and will not normally be loaded by     1945           and will not normally be loaded by the system unless explicitly
2481           requested by name.                     1946           requested by name.
2482                                                  1947 
2483           If unsure, say N.                      1948           If unsure, say N.
2484                                                  1949 
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                              1950 config TEST_VMALLOC
2498         tristate "Test module for stress/perf    1951         tristate "Test module for stress/performance analysis of vmalloc allocator"
2499         default n                                1952         default n
2500        depends on MMU                            1953        depends on MMU
2501         depends on m                             1954         depends on m
2502         help                                     1955         help
2503           This builds the "test_vmalloc" modu    1956           This builds the "test_vmalloc" module that should be used for
2504           stress and performance analysis. So    1957           stress and performance analysis. So, any new change for vmalloc
2505           subsystem can be evaluated from per    1958           subsystem can be evaluated from performance and stability point
2506           of view.                               1959           of view.
2507                                                  1960 
2508           If unsure, say N.                      1961           If unsure, say N.
2509                                                  1962 
                                                   >> 1963 config TEST_USER_COPY
                                                   >> 1964         tristate "Test user/kernel boundary protections"
                                                   >> 1965         depends on m
                                                   >> 1966         help
                                                   >> 1967           This builds the "test_user_copy" module that runs sanity checks
                                                   >> 1968           on the copy_to/from_user infrastructure, making sure basic
                                                   >> 1969           user/kernel boundary testing is working. If it fails to load,
                                                   >> 1970           a regression has been detected in the user/kernel memory boundary
                                                   >> 1971           protections.
                                                   >> 1972 
                                                   >> 1973           If unsure, say N.
                                                   >> 1974 
2510 config TEST_BPF                                  1975 config TEST_BPF
2511         tristate "Test BPF filter functionali    1976         tristate "Test BPF filter functionality"
2512         depends on m && NET                      1977         depends on m && NET
2513         help                                     1978         help
2514           This builds the "test_bpf" module t    1979           This builds the "test_bpf" module that runs various test vectors
2515           against the BPF interpreter or BPF     1980           against the BPF interpreter or BPF JIT compiler depending on the
2516           current setting. This is in particu    1981           current setting. This is in particular useful for BPF JIT compiler
2517           development, but also to run regres    1982           development, but also to run regression tests against changes in
2518           the interpreter code. It also enabl    1983           the interpreter code. It also enables test stubs for eBPF maps and
2519           verifier used by user space verifie    1984           verifier used by user space verifier testsuite.
2520                                                  1985 
2521           If unsure, say N.                      1986           If unsure, say N.
2522                                                  1987 
2523 config TEST_BLACKHOLE_DEV                        1988 config TEST_BLACKHOLE_DEV
2524         tristate "Test blackhole netdev funct    1989         tristate "Test blackhole netdev functionality"
2525         depends on m && NET                      1990         depends on m && NET
2526         help                                     1991         help
2527           This builds the "test_blackhole_dev    1992           This builds the "test_blackhole_dev" module that validates the
2528           data path through this blackhole ne    1993           data path through this blackhole netdev.
2529                                                  1994 
2530           If unsure, say N.                      1995           If unsure, say N.
2531                                                  1996 
2532 config FIND_BIT_BENCHMARK                        1997 config FIND_BIT_BENCHMARK
2533         tristate "Test find_bit functions"       1998         tristate "Test find_bit functions"
2534         help                                     1999         help
2535           This builds the "test_find_bit" mod    2000           This builds the "test_find_bit" module that measure find_*_bit()
2536           functions performance.                 2001           functions performance.
2537                                                  2002 
2538           If unsure, say N.                      2003           If unsure, say N.
2539                                                  2004 
2540 config TEST_FIRMWARE                             2005 config TEST_FIRMWARE
2541         tristate "Test firmware loading via u    2006         tristate "Test firmware loading via userspace interface"
2542         depends on FW_LOADER                     2007         depends on FW_LOADER
2543         help                                     2008         help
2544           This builds the "test_firmware" mod    2009           This builds the "test_firmware" module that creates a userspace
2545           interface for testing firmware load    2010           interface for testing firmware loading. This can be used to
2546           control the triggering of firmware     2011           control the triggering of firmware loading without needing an
2547           actual firmware-using device. The c    2012           actual firmware-using device. The contents can be rechecked by
2548           userspace.                             2013           userspace.
2549                                                  2014 
2550           If unsure, say N.                      2015           If unsure, say N.
2551                                                  2016 
2552 config TEST_SYSCTL                               2017 config TEST_SYSCTL
2553         tristate "sysctl test driver"            2018         tristate "sysctl test driver"
2554         depends on PROC_SYSCTL                   2019         depends on PROC_SYSCTL
2555         help                                     2020         help
2556           This builds the "test_sysctl" modul    2021           This builds the "test_sysctl" module. This driver enables to test the
2557           proc sysctl interfaces available to    2022           proc sysctl interfaces available to drivers safely without affecting
2558           production knobs which might alter     2023           production knobs which might alter system functionality.
2559                                                  2024 
2560           If unsure, say N.                      2025           If unsure, say N.
2561                                                  2026 
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                         2027 config SYSCTL_KUNIT_TEST
2628         tristate "KUnit test for sysctl" if ! !! 2028         bool "KUnit test for sysctl"
2629         depends on KUNIT                         2029         depends on KUNIT
2630         default KUNIT_ALL_TESTS               << 
2631         help                                     2030         help
2632           This builds the proc sysctl unit te    2031           This builds the proc sysctl unit test, which runs on boot.
2633           Tests the API contract and implemen    2032           Tests the API contract and implementation correctness of sysctl.
2634           For more information on KUnit and u    2033           For more information on KUnit and unit tests in general please refer
2635           to the KUnit documentation in Docum    2034           to the KUnit documentation in Documentation/dev-tools/kunit/.
2636                                                  2035 
2637           If unsure, say N.                      2036           If unsure, say N.
2638                                                  2037 
2639 config LIST_KUNIT_TEST                           2038 config LIST_KUNIT_TEST
2640         tristate "KUnit Test for Kernel Linke !! 2039         bool "KUnit Test for Kernel Linked-list structures"
2641         depends on KUNIT                         2040         depends on KUNIT
2642         default KUNIT_ALL_TESTS               << 
2643         help                                     2041         help
2644           This builds the linked list KUnit t    2042           This builds the linked list KUnit test suite.
2645           It tests that the API and basic fun    2043           It tests that the API and basic functionality of the list_head type
2646           and associated macros.                 2044           and associated macros.
2647                                                  2045 
2648           KUnit tests run during boot and out    2046           KUnit tests run during boot and output the results to the debug log
2649           in TAP format (https://testanything !! 2047           in TAP format (http://testanything.org/). Only useful for kernel devs
2650           running the KUnit test harness, and    2048           running the KUnit test harness, and not intended for inclusion into a
2651           production build.                      2049           production build.
2652                                                  2050 
2653           For more information on KUnit and u    2051           For more information on KUnit and unit tests in general please refer
2654           to the KUnit documentation in Docum    2052           to the KUnit documentation in Documentation/dev-tools/kunit/.
2655                                                  2053 
2656           If unsure, say N.                      2054           If unsure, say N.
2657                                                  2055 
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                               2056 config TEST_UDELAY
2817         tristate "udelay test driver"            2057         tristate "udelay test driver"
2818         help                                     2058         help
2819           This builds the "udelay_test" modul    2059           This builds the "udelay_test" module that helps to make sure
2820           that udelay() is working properly.     2060           that udelay() is working properly.
2821                                                  2061 
2822           If unsure, say N.                      2062           If unsure, say N.
2823                                                  2063 
2824 config TEST_STATIC_KEYS                          2064 config TEST_STATIC_KEYS
2825         tristate "Test static keys"              2065         tristate "Test static keys"
2826         depends on m                             2066         depends on m
2827         help                                     2067         help
2828           Test the static key interfaces.        2068           Test the static key interfaces.
2829                                                  2069 
2830           If unsure, say N.                      2070           If unsure, say N.
2831                                                  2071 
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                                 2072 config TEST_KMOD
2843         tristate "kmod stress tester"            2073         tristate "kmod stress tester"
2844         depends on m                             2074         depends on m
2845         depends on NETDEVICES && NET_CORE &&     2075         depends on NETDEVICES && NET_CORE && INET # for TUN
2846         depends on BLOCK                         2076         depends on BLOCK
2847         depends on PAGE_SIZE_LESS_THAN_256KB  << 
2848         select TEST_LKM                          2077         select TEST_LKM
2849         select XFS_FS                            2078         select XFS_FS
2850         select TUN                               2079         select TUN
2851         select BTRFS_FS                          2080         select BTRFS_FS
2852         help                                     2081         help
2853           Test the kernel's module loading me    2082           Test the kernel's module loading mechanism: kmod. kmod implements
2854           support to load modules using the L    2083           support to load modules using the Linux kernel's usermode helper.
2855           This test provides a series of test    2084           This test provides a series of tests against kmod.
2856                                                  2085 
2857           Although technically you can either    2086           Although technically you can either build test_kmod as a module or
2858           into the kernel we disallow buildin    2087           into the kernel we disallow building it into the kernel since
2859           it stress tests request_module() an    2088           it stress tests request_module() and this will very likely cause
2860           some issues by taking over precious    2089           some issues by taking over precious threads available from other
2861           module load requests, ultimately th    2090           module load requests, ultimately this could be fatal.
2862                                                  2091 
2863           To run tests run:                      2092           To run tests run:
2864                                                  2093 
2865           tools/testing/selftests/kmod/kmod.s    2094           tools/testing/selftests/kmod/kmod.sh --help
2866                                                  2095 
2867           If unsure, say N.                      2096           If unsure, say N.
2868                                                  2097 
2869 config TEST_DEBUG_VIRTUAL                        2098 config TEST_DEBUG_VIRTUAL
2870         tristate "Test CONFIG_DEBUG_VIRTUAL f    2099         tristate "Test CONFIG_DEBUG_VIRTUAL feature"
2871         depends on DEBUG_VIRTUAL                 2100         depends on DEBUG_VIRTUAL
2872         help                                     2101         help
2873           Test the kernel's ability to detect    2102           Test the kernel's ability to detect incorrect calls to
2874           virt_to_phys() done against the non    2103           virt_to_phys() done against the non-linear part of the
2875           kernel's virtual address map.          2104           kernel's virtual address map.
2876                                                  2105 
2877           If unsure, say N.                      2106           If unsure, say N.
2878                                                  2107 
2879 config TEST_MEMCAT_P                             2108 config TEST_MEMCAT_P
2880         tristate "Test memcat_p() helper func    2109         tristate "Test memcat_p() helper function"
2881         help                                     2110         help
2882           Test the memcat_p() helper for corr    2111           Test the memcat_p() helper for correctly merging two
2883           pointer arrays together.               2112           pointer arrays together.
2884                                                  2113 
2885           If unsure, say N.                      2114           If unsure, say N.
2886                                                  2115 
2887 config TEST_OBJAGG                            !! 2116 config TEST_LIVEPATCH
2888         tristate "Perform selftest on object  !! 2117         tristate "Test livepatching"
2889         default n                                2118         default n
2890         depends on OBJAGG                     !! 2119         depends on DYNAMIC_DEBUG
                                                   >> 2120         depends on LIVEPATCH
                                                   >> 2121         depends on m
2891         help                                     2122         help
2892           Enable this option to test object a !! 2123           Test kernel livepatching features for correctness.  The tests will
2893           (or module load).                   !! 2124           load test modules that will be livepatched in various scenarios.
2894                                                  2125 
2895 config TEST_MEMINIT                           !! 2126           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                                                  2127 
2901           If unsure, say N.                   !! 2128           make -C tools/testing/selftests TARGETS=livepatch run_tests
2902                                                  2129 
2903 config TEST_HMM                               !! 2130           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                                                  2131 
2914           If unsure, say N.                   !! 2132           tools/testing/selftests/livepatch/test-callbacks.sh
                                                   >> 2133           tools/testing/selftests/livepatch/test-livepatch.sh
                                                   >> 2134           tools/testing/selftests/livepatch/test-shadow-vars.sh
2915                                                  2135 
2916 config TEST_FREE_PAGES                        !! 2136           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                                                  2137 
2925 config TEST_FPU                               !! 2138 config TEST_OBJAGG
2926         tristate "Test floating point operati !! 2139         tristate "Perform selftest on object aggreration manager"
2927         depends on ARCH_HAS_KERNEL_FPU_SUPPOR !! 2140         default n
                                                   >> 2141         depends on OBJAGG
2928         help                                     2142         help
2929           Enable this option to add /sys/kern !! 2143           Enable this option to test object aggregation manager on boot
2930           which will trigger a sequence of fl !! 2144           (or module load).
2931           for self-testing floating point con << 
2932           kernel_fpu_begin().                 << 
2933                                                  2145 
2934           If unsure, say N.                   << 
2935                                                  2146 
2936 config TEST_CLOCKSOURCE_WATCHDOG              !! 2147 config TEST_STACKINIT
2937         tristate "Test clocksource watchdog i !! 2148         tristate "Test level of stack variable initialization"
2938         depends on CLOCKSOURCE_WATCHDOG       << 
2939         help                                     2149         help
2940           Enable this option to create a kern !! 2150           Test if the kernel is zero-initializing stack variables and
2941           a test of the clocksource watchdog. !! 2151           padding. Coverage is controlled by compiler flags,
2942           via modprobe or insmod in which cas !! 2152           CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
2943           loaded, or it may be built in, in w !! 2153           or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
2944           shortly after boot.                 << 
2945                                                  2154 
2946           If unsure, say N.                      2155           If unsure, say N.
2947                                                  2156 
2948 config TEST_OBJPOOL                           !! 2157 config TEST_MEMINIT
2949         tristate "Test module for correctness !! 2158         tristate "Test heap/page initialization"
2950         default n                             << 
2951         depends on m && DEBUG_KERNEL          << 
2952         help                                     2159         help
2953           This builds the "test_objpool" modu !! 2160           Test if the kernel is zero-initializing heap and page allocations.
2954           correctness verification and concur !! 2161           This can be useful to test init_on_alloc and init_on_free features.
2955           allocation and reclamation.         << 
2956                                                  2162 
2957           If unsure, say N.                      2163           If unsure, say N.
2958                                                  2164 
2959 endif # RUNTIME_TESTING_MENU                     2165 endif # RUNTIME_TESTING_MENU
2960                                                  2166 
2961 config ARCH_USE_MEMTEST                       << 
2962         bool                                  << 
2963         help                                  << 
2964           An architecture should select this  << 
2965           during boot process.                << 
2966                                               << 
2967 config MEMTEST                                   2167 config MEMTEST
2968         bool "Memtest"                           2168         bool "Memtest"
2969         depends on ARCH_USE_MEMTEST           !! 2169         ---help---
2970         help                                  << 
2971           This option adds a kernel parameter    2170           This option adds a kernel parameter 'memtest', which allows memtest
2972           to be set and executed.             !! 2171           to be set.
2973                 memtest=0, mean disabled; --     2172                 memtest=0, mean disabled; -- default
2974                 memtest=1, mean do 1 test pat    2173                 memtest=1, mean do 1 test pattern;
2975                 ...                              2174                 ...
2976                 memtest=17, mean do 17 test p    2175                 memtest=17, mean do 17 test patterns.
2977           If you are unsure how to answer thi    2176           If you are unsure how to answer this question, answer N.
2978                                                  2177 
2979                                                  2178 
2980                                                  2179 
2981 config HYPERV_TESTING                            2180 config HYPERV_TESTING
2982         bool "Microsoft Hyper-V driver testin    2181         bool "Microsoft Hyper-V driver testing"
2983         default n                                2182         default n
2984         depends on HYPERV && DEBUG_FS            2183         depends on HYPERV && DEBUG_FS
2985         help                                     2184         help
2986           Select this option to enable Hyper-    2185           Select this option to enable Hyper-V vmbus testing.
2987                                                  2186 
2988 endmenu # "Kernel Testing and Coverage"          2187 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                                                  2188 
3053 endmenu # Kernel hacking                         2189 endmenu # Kernel hacking
                                                      

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