1 # SPDX-License-Identifier: GPL-2.0-only 2 menu "Kernel hacking" 3 4 menu "printk and dmesg options" 5 6 config PRINTK_TIME 7 bool "Show timing information on print 8 depends on PRINTK 9 help 10 Selecting this option causes time st 11 messages to be added to the output o 12 call and at the console. 13 14 The timestamp is always recorded int 15 to /dev/kmsg. This flag just specifi 16 be included, not that the timestamp 17 18 The behavior is also controlled by t 19 parameter printk.time=1. See Documen 20 21 config PRINTK_CALLER 22 bool "Show caller information on print 23 depends on PRINTK 24 help 25 Selecting this option causes printk( 26 in task context) or a caller "proces 27 to every message. 28 29 This option is intended for environm 30 concurrently call printk() for many 31 interpret without knowing where thes 32 line which was divided into multiple 33 34 Since toggling after boot makes the 35 no option to enable/disable at the k 36 sysfs interface. 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 50 int "Default console loglevel (1-15)" 51 range 1 15 52 default "7" 53 help 54 Default loglevel to determine what w 55 56 Setting a default here is equivalent 57 the kernel bootargs. loglevel=<x> co 58 value is specified here as well. 59 60 Note: This does not affect the log l 61 usage in the kernel. That is control 62 option. 63 64 config CONSOLE_LOGLEVEL_QUIET 65 int "quiet console loglevel (1-15)" 66 range 1 15 67 default "4" 68 help 69 loglevel to use when "quiet" is pass 70 71 When "quiet" is passed on the kernel 72 will be used as the loglevel. IOW pa 73 equivalent of passing "loglevel=<CON 74 75 config MESSAGE_LOGLEVEL_DEFAULT 76 int "Default message log level (1-7)" 77 range 1 7 78 default "4" 79 help 80 Default log level for printk stateme 81 82 This was hard-coded to KERN_WARNING 83 that are auditing their logs closely 84 priority. 85 86 Note: This does not affect what mess 87 by default. To change that, use logl 88 or pick a different CONSOLE_LOGLEVEL 89 90 config BOOT_PRINTK_DELAY 91 bool "Delay each boot printk message b 92 depends on DEBUG_KERNEL && PRINTK && G 93 help 94 This build option allows you to read 95 by inserting a short delay after eac 96 specified in milliseconds on the ker 97 using "boot_delay=N". 98 99 It is likely that you would also nee 100 the "loops per jiffie" value. 101 See a previous boot log for the "lpj 102 system, and then set "lpj=M" before 103 NOTE: Using this option may adverse 104 I.e., processors other than the firs 105 BOOT_PRINTK_DELAY also may cause LOC 106 what it believes to be lockup condit 107 108 config DYNAMIC_DEBUG 109 bool "Enable dynamic printk() support" 110 default n 111 depends on PRINTK 112 depends on (DEBUG_FS || PROC_FS) 113 select DYNAMIC_DEBUG_CORE 114 help 115 116 Compiles debug level messages into t 117 otherwise be available at runtime. T 118 enabled/disabled based on various le 119 function, module, format string, and 120 implicitly compiles in all pr_debug( 121 enlarges the kernel text size by abo 122 123 If a source file is compiled with DE 124 pr_debug() calls in it are enabled b 125 disabled at runtime as below. Note 126 turned on by many CONFIG_*DEBUG* opt 127 128 Usage: 129 130 Dynamic debugging is controlled via 131 which is contained in the 'debugfs' 132 Thus, the debugfs or procfs filesyst 133 making use of this feature. 134 We refer the control file as: <debug 135 file contains a list of the debug st 136 format for each line of the file is: 137 138 filename:lineno [module]functi 139 140 filename : source file of the debug 141 lineno : line number of the debug st 142 module : module that contains the de 143 function : function that contains th 144 flags : '=p' means the line is turne 145 format : the format used for the deb 146 147 From a live system: 148 149 nullarbor:~ # cat <debugfs>/dy 150 # filename:lineno [module]func 151 fs/aio.c:222 [aio]__put_ioctx 152 fs/aio.c:248 [aio]ioctx_alloc 153 fs/aio.c:1770 [aio]sys_io_canc 154 155 Example usage: 156 157 // enable the message at line 158 nullarbor:~ # echo -n 'file sv 159 160 161 // enable all the messages in 162 nullarbor:~ # echo -n 'file sv 163 164 165 // enable all the messages in 166 nullarbor:~ # echo -n 'module 167 168 169 // enable all 12 messages in t 170 nullarbor:~ # echo -n 'func sv 171 172 173 // disable all 12 messages in 174 nullarbor:~ # echo -n 'func sv 175 176 177 See Documentation/admin-guide/dynami 178 information. 179 180 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 192 bool "Support symbolic error names in 193 default y if PRINTK 194 help 195 If you say Y here, the kernel's prin 196 be able to print symbolic error name 197 of the number 28. It makes the kerne 198 (about 3KB), but can make the kernel 199 200 config DEBUG_BUGVERBOSE 201 bool "Verbose BUG() reporting (adds 70 202 depends on BUG && (GENERIC_BUG || HAVE 203 default y 204 help 205 Say Y here to make BUG() panics outp 206 of the BUG call as well as the EIP a 207 debugging but costs about 70-100K of 208 209 endmenu # "printk and dmesg options" 210 211 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 226 227 config DEBUG_INFO 228 bool 229 help 230 A kernel debug info option other tha 231 in the "Debug information" choice be 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 247 is needed if you intend to use kerne 248 tools like crash, kgdb, LKCD, gdb, e 249 250 Choose which version of DWARF debug 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 304 305 config DEBUG_INFO_REDUCED 306 bool "Reduce debugging information" 307 help 308 If you say Y here gcc is instructed 309 information for structure types. Thi 310 need full debugging information (lik 311 be happy. But if you merely need deb 312 resolve line numbers there is no los 313 build directory object sizes shrink 314 DEBUG_INFO build and compile times a 315 Only works with newer gcc versions. 316 317 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 358 bool "Produce split debuginfo in .dwo 359 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 366 Generate debug info into separate .d 367 reduces the build directory size for 368 because it stores the information on 369 files instead of multiple times in o 370 In addition the debug information is 371 372 Requires recent gcc (4.7+) and recen 373 Any tool that packages or reads debu 374 to know about the .dwo files and inc 375 Incompatible with older versions of 376 377 config DEBUG_INFO_BTF 378 bool "Generate BTF type information" 379 depends on !DEBUG_INFO_SPLIT && !DEBUG 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 386 Generate deduplicated BTF type infor 387 Turning this on expects presence of 388 DWARF type info into equivalent dedu 389 390 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 428 bool "Provide GDB scripts for kernel d 429 help 430 This creates the required links to G 431 build directory. If you load vmlinux 432 scripts will be automatically import 433 additional functions are available t 434 instance. See Documentation/dev-tool 435 for further details. 436 437 endif # DEBUG_INFO 438 439 config FRAME_WARN 440 int "Warn for stack frames larger than 441 range 0 8192 442 default 0 if KMSAN 443 default 2048 if GCC_PLUGIN_LATENT_ENTR 444 default 2048 if PARISC 445 default 1536 if (!64BIT && XTENSA) 446 default 1280 if KASAN && !64BIT 447 default 1024 if !64BIT 448 default 2048 if 64BIT 449 help 450 Tell the compiler to warn at build t 451 Setting this too low will cause a lo 452 Setting it to 0 disables the warning 453 454 config STRIP_ASM_SYMS 455 bool "Strip assembler-generated symbol 456 default n 457 help 458 Strip internal assembler-generated s 459 that look like '.Lxxx') so they don' 460 get_wchan() and suchlike. 461 462 config READABLE_ASM 463 bool "Generate readable assembler code 464 depends on DEBUG_KERNEL 465 depends on CC_IS_GCC 466 help 467 Disable some compiler optimizations 468 assembler output. This may make the 469 to keep kernel developers who have t 470 sane. 471 472 config HEADERS_INSTALL 473 bool "Install uapi headers to usr/incl 474 depends on !UML 475 help 476 This option will install uapi header 477 into the usr/include directory for u 478 This is unneeded for building the ke 479 user-space program samples. It is al 480 as uapi header sanity checks. 481 482 config DEBUG_SECTION_MISMATCH 483 bool "Enable full Section mismatch ana 484 depends on CC_IS_GCC 485 help 486 The section mismatch analysis checks 487 references from one section to anoth 488 During linktime or runtime, some sec 489 any use of code/data previously in t 490 most likely result in an oops. 491 In the code, functions and variables 492 __init,, etc. (see the full list in 493 which results in the code/data being 494 The section mismatch analysis is alw 495 kernel build, and enabling this opti 496 additional step to occur: 497 - Add the option -fno-inline-functio 498 When inlining a function annotated 499 function, we would lose the sectio 500 the analysis would not catch the i 501 This option tells gcc to inline le 502 a larger kernel). 503 504 config SECTION_MISMATCH_WARN_ONLY 505 bool "Make section mismatch errors non 506 default y 507 help 508 If you say N here, the build process 509 section mismatch, instead of just th 510 511 If unsure, say Y. 512 513 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 # 527 # Select this config option from the architect 528 # is preferred to always offer frame pointers 529 # option on the architecture (regardless of KE 530 # 531 config ARCH_WANT_FRAME_POINTERS 532 bool 533 534 config FRAME_POINTER 535 bool "Compile the kernel with frame po 536 depends on DEBUG_KERNEL && (M68K || UM 537 default y if (DEBUG_INFO && UML) || AR 538 help 539 If you say Y here the resulting kern 540 larger and slower, but it gives very 541 in case of kernel bugs. (precise oop 542 543 config OBJTOOL 544 bool 545 546 config STACK_VALIDATION 547 bool "Compile-time stack metadata vali 548 depends on HAVE_STACK_VALIDATION && UN 549 select OBJTOOL 550 default n 551 help 552 Validate frame pointer rules at comp 553 runtime stack traces are more reliab 554 555 For more information, see 556 tools/objtool/Documentation/objtool. 557 558 config NOINSTR_VALIDATION 559 bool 560 depends on HAVE_NOINSTR_VALIDATION && 561 select OBJTOOL 562 default y 563 564 config VMLINUX_MAP 565 bool "Generate vmlinux.map file when l 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 573 574 config DEBUG_FORCE_WEAK_PER_CPU 575 bool "Force weak per-cpu definitions" 576 depends on DEBUG_KERNEL 577 help 578 s390 and alpha require percpu variab 579 defined weak to work around addressi 580 puts the following two restrictions 581 definitions. 582 583 1. percpu symbols must be unique whe 584 2. percpu variables can't be defined 585 586 To ensure that generic code follows 587 option forces all percpu variables t 588 589 endmenu # "Compiler options" 590 591 menu "Generic Kernel Debugging Instruments" 592 593 config MAGIC_SYSRQ 594 bool "Magic SysRq key" 595 depends on !UML 596 help 597 If you say Y here, you will have som 598 if the system crashes for example du 599 will be able to flush the buffer cac 600 immediately or dump some status info 601 by pressing various keys while holdi 602 also works on a serial console (on P 603 send a BREAK and then within 5 secon 604 keys are documented in <file:Documen 605 Don't say Y unless you really know w 606 607 config MAGIC_SYSRQ_DEFAULT_ENABLE 608 hex "Enable magic SysRq key functions 609 depends on MAGIC_SYSRQ 610 default 0x1 611 help 612 Specifies which SysRq key functions 613 This may be set to 1 or 0 to enable 614 to a bitmask as described in Documen 615 616 config MAGIC_SYSRQ_SERIAL 617 bool "Enable magic SysRq key over seri 618 depends on MAGIC_SYSRQ 619 default y 620 help 621 Many embedded boards have a disconne 622 generate some garbage that can lead 623 This option allows you to decide whe 624 magic SysRq key. 625 626 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 637 bool "Debug Filesystem" 638 help 639 debugfs is a virtual file system tha 640 debugging files into. Enable this o 641 write to these files. 642 643 For detailed documentation on the de 644 Documentation/filesystems/. 645 646 If unsure, say N. 647 648 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" 681 source "lib/Kconfig.ubsan" 682 source "lib/Kconfig.kcsan" 683 684 endmenu 685 686 menu "Networking Debugging" 687 688 source "net/Kconfig.debug" 689 690 endmenu # "Networking Debugging" 691 692 menu "Memory Debugging" 693 694 source "mm/Kconfig.debug" 695 696 config DEBUG_OBJECTS 697 bool "Debug object operations" 698 depends on DEBUG_KERNEL 699 help 700 If you say Y here, additional code w 701 kernel to track the life time of var 702 the operations on those objects. 703 704 config DEBUG_OBJECTS_SELFTEST 705 bool "Debug objects selftest" 706 depends on DEBUG_OBJECTS 707 help 708 This enables the selftest of the obj 709 710 config DEBUG_OBJECTS_FREE 711 bool "Debug objects in freed memory" 712 depends on DEBUG_OBJECTS 713 help 714 This enables checks whether a k/v fr 715 which contains an object which has n 716 properly. This can make kmalloc/kfre 717 much slower. 718 719 config DEBUG_OBJECTS_TIMERS 720 bool "Debug timer objects" 721 depends on DEBUG_OBJECTS 722 help 723 If you say Y here, additional code w 724 timer routines to track the life tim 725 validate the timer operations. 726 727 config DEBUG_OBJECTS_WORK 728 bool "Debug work objects" 729 depends on DEBUG_OBJECTS 730 help 731 If you say Y here, additional code w 732 work queue routines to track the lif 733 validate the work operations. 734 735 config DEBUG_OBJECTS_RCU_HEAD 736 bool "Debug RCU callbacks objects" 737 depends on DEBUG_OBJECTS 738 help 739 Enable this to turn on debugging of 740 741 config DEBUG_OBJECTS_PERCPU_COUNTER 742 bool "Debug percpu counter objects" 743 depends on DEBUG_OBJECTS 744 help 745 If you say Y here, additional code w 746 percpu counter routines to track the 747 objects and validate the percpu coun 748 749 config DEBUG_OBJECTS_ENABLE_DEFAULT 750 int "debug_objects bootup default valu 751 range 0 1 752 default "1" 753 depends on DEBUG_OBJECTS 754 help 755 Debug objects boot parameter default 756 757 config SHRINKER_DEBUG 758 bool "Enable shrinker debugging suppor 759 depends on DEBUG_FS 760 help 761 Say Y to enable the shrinker debugfs 762 visibility into the kernel memory sh 763 Disable it to avoid an extra memory 764 765 config DEBUG_STACK_USAGE 766 bool "Stack utilization instrumentatio 767 depends on DEBUG_KERNEL 768 help 769 Enables the display of the minimum a 770 task has ever had available in the s 771 Also emits a message to dmesg when a 772 used more stack space than previousl 773 774 This option will slow down process c 775 776 config SCHED_STACK_END_CHECK 777 bool "Detect stack corruption on calls 778 depends on DEBUG_KERNEL 779 default n 780 help 781 This option checks for a stack overr 782 If the stack end location is found t 783 the content of the corrupted region 784 This is to ensure no erroneous behav 785 data corruption or a sporadic crash 786 is examined. The runtime overhead in 787 788 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 798 bool "Debug VM" 799 depends on DEBUG_KERNEL 800 help 801 Enable this to turn on extended chec 802 that may impact performance. 803 804 If unsure, say N. 805 806 config DEBUG_VM_SHOOT_LAZIES 807 bool "Debug MMU_LAZY_TLB_SHOOTDOWN imp 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 819 select DEBUG_MAPLE_TREE 820 help 821 Enable VM maple tree debugging infor 822 823 If unsure, say N. 824 825 config DEBUG_VM_RB 826 bool "Debug VM red-black trees" 827 depends on DEBUG_VM 828 help 829 Enable VM red-black tree debugging i 830 831 If unsure, say N. 832 833 config DEBUG_VM_PGFLAGS 834 bool "Debug page-flags operations" 835 depends on DEBUG_VM 836 help 837 Enables extra validation on page fla 838 839 If unsure, say N. 840 841 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 858 bool 859 860 config DEBUG_VIRTUAL 861 bool "Debug VM translations" 862 depends on DEBUG_KERNEL && ARCH_HAS_DE 863 help 864 Enable some costly sanity checks in 865 catch mistakes with virt_to_page() a 866 867 If unsure, say N. 868 869 config DEBUG_NOMMU_REGIONS 870 bool "Debug the global anon/private NO 871 depends on DEBUG_KERNEL && !MMU 872 help 873 This option causes the global tree o 874 regions to be regularly checked for 875 876 config DEBUG_MEMORY_INIT 877 bool "Debug memory initialisation" if 878 default !EXPERT 879 help 880 Enable this for additional checks du 881 The sanity checks verify aspects of 882 and other information provided by th 883 information will be printed at KERN_ 884 on the mminit_loglevel= command-line 885 886 If unsure, say Y 887 888 config MEMORY_NOTIFIER_ERROR_INJECT 889 tristate "Memory hotplug notifier erro 890 depends on MEMORY_HOTPLUG && NOTIFIER_ 891 help 892 This option provides the ability to 893 memory hotplug notifier chain callba 894 debugfs interface under /sys/kernel/ 895 896 If the notifier call chain should be 897 notified, write the error code to "a 898 899 Example: Inject memory hotplug offli 900 901 # cd /sys/kernel/debug/notifier-erro 902 # echo -12 > actions/MEM_GOING_OFFLI 903 # echo offline > /sys/devices/system 904 bash: echo: write error: Cannot allo 905 906 To compile this code as a module, ch 907 be called memory-notifier-error-inje 908 909 If unsure, say N. 910 911 config DEBUG_PER_CPU_MAPS 912 bool "Debug access to per_cpu maps" 913 depends on DEBUG_KERNEL 914 depends on SMP 915 help 916 Say Y to verify that the per_cpu map 917 been set up. This adds a fair amount 918 and decreases performance. 919 920 Say N if unsure. 921 922 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 943 bool "Highmem debugging" 944 depends on DEBUG_KERNEL && HIGHMEM 945 select DEBUG_KMAP_LOCAL_FORCE_MAP if A 946 select DEBUG_KMAP_LOCAL 947 help 948 This option enables additional error 949 systems. Disable for production sys 950 951 config HAVE_DEBUG_STACKOVERFLOW 952 bool 953 954 config DEBUG_STACKOVERFLOW 955 bool "Check for stack overflows" 956 depends on DEBUG_KERNEL && HAVE_DEBUG_ 957 help 958 Say Y here if you want to check for 959 and exception stacks (if your archit 960 option will show detailed messages i 961 below a certain limit. 962 963 These kinds of bugs usually occur wh 964 kernel get too deep, especially when 965 involved. 966 967 Use this in cases where you see appa 968 corruption, especially if it appears 969 970 If in doubt, say "N". 971 972 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" 1004 source "lib/Kconfig.kfence" 1005 source "lib/Kconfig.kmsan" 1006 1007 endmenu # "Memory Debugging" 1008 1009 config DEBUG_SHIRQ 1010 bool "Debug shared IRQ handlers" 1011 depends on DEBUG_KERNEL 1012 help 1013 Enable this to generate a spurious 1014 interrupt handler is deregistered ( 1015 is currently disabled). Drivers nee 1016 don't and need to be caught. 1017 1018 menu "Debug Oops, Lockups and Hangs" 1019 1020 config PANIC_ON_OOPS 1021 bool "Panic on Oops" 1022 help 1023 Say Y here to enable the kernel to 1024 has the same effect as setting oops 1025 line. 1026 1027 This feature is useful to ensure th 1028 anything erroneous after an oops wh 1029 corruption or other issues. 1030 1031 Say N if unsure. 1032 1033 config PANIC_ON_OOPS_VALUE 1034 int 1035 range 0 1 1036 default 0 if !PANIC_ON_OOPS 1037 default 1 if PANIC_ON_OOPS 1038 1039 config PANIC_TIMEOUT 1040 int "panic timeout" 1041 default 0 1042 help 1043 Set the timeout value (in seconds) 1044 the kernel panics. If n = 0, then w 1045 value n > 0 will wait n seconds bef 1046 value n < 0 will reboot immediately 1047 with the kernel command line option 1048 /proc/sys/kernel/panic. 1049 1050 config LOCKUP_DETECTOR 1051 bool 1052 1053 config SOFTLOCKUP_DETECTOR 1054 bool "Detect Soft Lockups" 1055 depends on DEBUG_KERNEL && !S390 1056 select LOCKUP_DETECTOR 1057 help 1058 Say Y here to enable the kernel to 1059 soft lockups. 1060 1061 Softlockups are bugs that cause the 1062 mode for more than 20 seconds, with 1063 chance to run. The current stack t 1064 detection and the system will stay 1065 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 1081 bool "Panic (Reboot) On Soft Lockups" 1082 depends on SOFTLOCKUP_DETECTOR 1083 help 1084 Say Y here to enable the kernel to 1085 which are bugs that cause the kerne 1086 mode for more than 20 seconds (conf 1087 sysctl), without giving other tasks 1088 1089 The panic can be used in combinatio 1090 to cause the system to reboot autom 1091 lockup has been detected. This feat 1092 high-availability systems that have 1093 where a lockup must be resolved ASA 1094 1095 Say N if unsure. 1096 1097 config HAVE_HARDLOCKUP_DETECTOR_BUDDY 1098 bool 1099 depends on SMP 1100 default y 1101 1102 # 1103 # Global switch whether to build a hardlockup 1104 # only when the architecture supports at leas 1105 # two exceptions. The hardlockup detector is 1106 # 1107 # s390: it reported many false positive 1108 # 1109 # sparc64: has a custom implementation 1110 # hardlockup command line optio 1111 # 1112 config HARDLOCKUP_DETECTOR 1113 bool "Detect Hard Lockups" 1114 depends on DEBUG_KERNEL && !S390 && ! 1115 depends on HAVE_HARDLOCKUP_DETECTOR_P 1116 imply HARDLOCKUP_DETECTOR_PERF 1117 imply HARDLOCKUP_DETECTOR_BUDDY 1118 imply HARDLOCKUP_DETECTOR_ARCH 1119 select LOCKUP_DETECTOR 1120 1121 help 1122 Say Y here to enable the kernel to 1123 hard lockups. 1124 1125 Hardlockups are bugs that cause the 1126 for more than 10 seconds, without l 1127 chance to run. The current stack t 1128 and the system will stay locked up. 1129 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 1188 bool "Panic (Reboot) On Hard Lockups" 1189 depends on HARDLOCKUP_DETECTOR 1190 help 1191 Say Y here to enable the kernel to 1192 which are bugs that cause the kerne 1193 mode with interrupts disabled for m 1194 using the watchdog_thresh sysctl). 1195 1196 Say N if unsure. 1197 1198 config DETECT_HUNG_TASK 1199 bool "Detect Hung Tasks" 1200 depends on DEBUG_KERNEL 1201 default SOFTLOCKUP_DETECTOR 1202 help 1203 Say Y here to enable the kernel to 1204 which are bugs that cause the task 1205 uninterruptible "D" state indefinit 1206 1207 When a hung task is detected, the k 1208 current stack trace (which you shou 1209 task will stay in uninterruptible s 1210 enabled then all held locks will al 1211 feature has negligible overhead. 1212 1213 config DEFAULT_HUNG_TASK_TIMEOUT 1214 int "Default timeout for hung task de 1215 depends on DETECT_HUNG_TASK 1216 default 120 1217 help 1218 This option controls the default ti 1219 to determine when a task has become 1220 be considered hung. 1221 1222 It can be adjusted at runtime via t 1223 sysctl or by writing a value to 1224 /proc/sys/kernel/hung_task_timeout_ 1225 1226 A timeout of 0 disables the check. 1227 Keeping the default should be fine 1228 1229 config BOOTPARAM_HUNG_TASK_PANIC 1230 bool "Panic (Reboot) On Hung Tasks" 1231 depends on DETECT_HUNG_TASK 1232 help 1233 Say Y here to enable the kernel to 1234 which are bugs that cause the kerne 1235 in uninterruptible "D" state. 1236 1237 The panic can be used in combinatio 1238 to cause the system to reboot autom 1239 hung task has been detected. This f 1240 high-availability systems that have 1241 where a hung tasks must be resolved 1242 1243 Say N if unsure. 1244 1245 config WQ_WATCHDOG 1246 bool "Detect Workqueue Stalls" 1247 depends on DEBUG_KERNEL 1248 help 1249 Say Y here to enable stall detectio 1250 worker pool doesn't make forward pr 1251 item for over a given amount of tim 1252 warning message is printed along wi 1253 state. This can be configured thro 1254 "workqueue.watchdog_thresh" and its 1255 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" 1283 1284 menu "Scheduler Debugging" 1285 1286 config SCHED_DEBUG 1287 bool "Collect scheduler debugging inf 1288 depends on DEBUG_KERNEL && DEBUG_FS 1289 default y 1290 help 1291 If you say Y here, the /sys/kernel/ 1292 that can help debug the scheduler. 1293 option is minimal. 1294 1295 config SCHED_INFO 1296 bool 1297 default n 1298 1299 config SCHEDSTATS 1300 bool "Collect scheduler statistics" 1301 depends on PROC_FS 1302 select SCHED_INFO 1303 help 1304 If you say Y here, additional code 1305 scheduler and related routines to c 1306 scheduler behavior and provide them 1307 stats may be useful for both tuning 1308 If you aren't debugging the schedul 1309 application, you can say N to avoid 1310 this adds. 1311 1312 endmenu 1313 1314 config DEBUG_TIMEKEEPING 1315 bool "Enable extra timekeeping sanity 1316 help 1317 This option will enable additional 1318 which may be helpful when diagnosin 1319 problems are suspected. 1320 1321 This may include checks in the time 1322 option may have a (very small) perf 1323 workloads. 1324 1325 If unsure, say N. 1326 1327 config DEBUG_PREEMPT 1328 bool "Debug preemptible kernel" 1329 depends on DEBUG_KERNEL && PREEMPTION 1330 help 1331 If you say Y here then the kernel w 1332 commonly used smp_processor_id() fu 1333 if kernel code uses it in a preempt 1334 will detect preemption count underf 1335 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 1341 1342 config LOCK_DEBUGGING_SUPPORT 1343 bool 1344 depends on TRACE_IRQFLAGS_SUPPORT && 1345 default y 1346 1347 config PROVE_LOCKING 1348 bool "Lock debugging: prove locking c 1349 depends on DEBUG_KERNEL && LOCK_DEBUG 1350 select LOCKDEP 1351 select DEBUG_SPINLOCK 1352 select DEBUG_MUTEXES if !PREEMPT_RT 1353 select DEBUG_RT_MUTEXES if RT_MUTEXES 1354 select DEBUG_RWSEMS if !PREEMPT_RT 1355 select DEBUG_WW_MUTEX_SLOWPATH 1356 select DEBUG_LOCK_ALLOC 1357 select PREEMPT_COUNT if !ARCH_NO_PREE 1358 select TRACE_IRQFLAGS 1359 default n 1360 help 1361 This feature enables the kernel to p 1362 that occurs in the kernel runtime is 1363 correct: that under no circumstance 1364 not yet triggered) combination of ob 1365 sequences (on an arbitrary number of 1366 arbitrary number of tasks and interr 1367 deadlock. 1368 1369 In short, this feature enables the k 1370 related deadlocks before they actual 1371 1372 The proof does not depend on how har 1373 deadlock scenario would be to trigge 1374 participant CPUs, tasks and irq-cont 1375 for it to trigger. The proof also do 1376 timing: if a race and a resulting de 1377 theoretically (no matter how unlikel 1378 is), it will be proven so and will i 1379 reported by the kernel (once the eve 1380 makes the deadlock theoretically pos 1381 1382 If a deadlock is impossible (i.e. th 1383 observed by the kernel, are mathemat 1384 kernel reports nothing. 1385 1386 NOTE: this feature can also be enabl 1387 and rwsems - in which case all depen 1388 different locking variants are obser 1389 the proof of observed correctness is 1390 arbitrary combination of these separ 1391 1392 For more details, see Documentation/ 1393 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 1412 bool "Lock usage statistics" 1413 depends on DEBUG_KERNEL && LOCK_DEBUG 1414 select LOCKDEP 1415 select DEBUG_SPINLOCK 1416 select DEBUG_MUTEXES if !PREEMPT_RT 1417 select DEBUG_RT_MUTEXES if RT_MUTEXES 1418 select DEBUG_LOCK_ALLOC 1419 default n 1420 help 1421 This feature enables tracking lock c 1422 1423 For more details, see Documentation/ 1424 1425 This also enables lock events requir 1426 subcommand of perf. 1427 If you want to use "perf lock", you 1428 CONFIG_EVENT_TRACING. 1429 1430 CONFIG_LOCK_STAT defines "contended" 1431 (CONFIG_LOCKDEP defines "acquire" an 1432 1433 config DEBUG_RT_MUTEXES 1434 bool "RT Mutex debugging, deadlock de 1435 depends on DEBUG_KERNEL && RT_MUTEXES 1436 help 1437 This allows rt mutex semantics viola 1438 deadlocks (lockups) to be detected a 1439 1440 config DEBUG_SPINLOCK 1441 bool "Spinlock and rw-lock debugging: 1442 depends on DEBUG_KERNEL 1443 select UNINLINE_SPIN_UNLOCK 1444 help 1445 Say Y here and build SMP to catch m 1446 and certain other kinds of spinlock 1447 best used in conjunction with the N 1448 deadlocks are also debuggable. 1449 1450 config DEBUG_MUTEXES 1451 bool "Mutex debugging: basic checks" 1452 depends on DEBUG_KERNEL && !PREEMPT_R 1453 help 1454 This feature allows mutex semantics 1455 reported. 1456 1457 config DEBUG_WW_MUTEX_SLOWPATH 1458 bool "Wait/wound mutex debugging: Slo 1459 depends on DEBUG_KERNEL && LOCK_DEBUG 1460 select DEBUG_LOCK_ALLOC 1461 select DEBUG_SPINLOCK 1462 select DEBUG_MUTEXES if !PREEMPT_RT 1463 select DEBUG_RT_MUTEXES if PREEMPT_RT 1464 help 1465 This feature enables slowpath testin 1466 injecting additional -EDEADLK wound/ 1467 the full mutex checks enabled with ( 1468 will test all possible w/w mutex int 1469 exception of simply not acquiring al 1470 Note that this feature can introduce 1471 it really should not be enabled in a 1472 even a debug kernel. If you are a d 1473 you are a distro, do not. 1474 1475 config DEBUG_RWSEMS 1476 bool "RW Semaphore debugging: basic c 1477 depends on DEBUG_KERNEL && !PREEMPT_R 1478 help 1479 This debugging feature allows misma 1480 and unlocks to be detected and repo 1481 1482 config DEBUG_LOCK_ALLOC 1483 bool "Lock debugging: detect incorrec 1484 depends on DEBUG_KERNEL && LOCK_DEBUG 1485 select DEBUG_SPINLOCK 1486 select DEBUG_MUTEXES if !PREEMPT_RT 1487 select DEBUG_RT_MUTEXES if RT_MUTEXES 1488 select LOCKDEP 1489 help 1490 This feature will check whether any 1491 mutex or rwsem) is incorrectly freed 1492 memory-freeing routines (kfree(), km 1493 vfree(), etc.), whether a live lock 1494 spin_lock_init()/mutex_init()/etc., 1495 held during task exit. 1496 1497 config LOCKDEP 1498 bool 1499 depends on DEBUG_KERNEL && LOCK_DEBUG 1500 select STACKTRACE 1501 select KALLSYMS 1502 select KALLSYMS_ALL 1503 1504 config LOCKDEP_SMALL 1505 bool 1506 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 1548 bool "Lock dependency engine debuggin 1549 depends on DEBUG_KERNEL && LOCKDEP 1550 select DEBUG_IRQFLAGS 1551 help 1552 If you say Y here, the lock depende 1553 additional runtime checks to debug 1554 of more runtime overhead. 1555 1556 config DEBUG_ATOMIC_SLEEP 1557 bool "Sleep inside atomic section che 1558 select PREEMPT_COUNT 1559 depends on DEBUG_KERNEL 1560 depends on !ARCH_NO_PREEMPT 1561 help 1562 If you say Y here, various routines 1563 noisy if they are called inside ato 1564 held, inside an rcu read side criti 1565 sections, inside an interrupt, etc. 1566 1567 config DEBUG_LOCKING_API_SELFTESTS 1568 bool "Locking API boot-time self-test 1569 depends on DEBUG_KERNEL 1570 help 1571 Say Y here if you want the kernel t 1572 bootup. The self-test checks whethe 1573 are detected by debugging mechanism 1574 lock debugging then those bugs won' 1575 The following locking APIs are cove 1576 mutexes and rwsems. 1577 1578 config LOCK_TORTURE_TEST 1579 tristate "torture tests for locking" 1580 depends on DEBUG_KERNEL 1581 select TORTURE_TEST 1582 help 1583 This option provides a kernel modul 1584 on kernel locking primitives. The 1585 after the fact on the running kerne 1586 1587 Say Y here if you want kernel locki 1588 to be built into the kernel. 1589 Say M if you want these torture tes 1590 Say N if you are unsure. 1591 1592 config WW_MUTEX_SELFTEST 1593 tristate "Wait/wound mutex selftests" 1594 help 1595 This option provides a kernel modul 1596 on the struct ww_mutex locking API. 1597 1598 It is recommended to enable DEBUG_W 1599 with this test harness. 1600 1601 Say M if you want these self tests 1602 Say N if you are unsure. 1603 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 1635 1636 config TRACE_IRQFLAGS 1637 depends on TRACE_IRQFLAGS_SUPPORT 1638 bool 1639 help 1640 Enables hooks to interrupt enabling 1641 either tracing or lock debugging. 1642 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 1667 bool "Stack backtrace support" 1668 depends on STACKTRACE_SUPPORT 1669 help 1670 This option causes the kernel to cr 1671 every process, showing its current 1672 It is also used by various kernel d 1673 stack trace generation. 1674 1675 config WARN_ALL_UNSEEDED_RANDOM 1676 bool "Warn for all uses of unseeded r 1677 default n 1678 help 1679 Some parts of the kernel contain bu 1680 cryptographically secure random num 1681 to generate those numbers securely. 1682 flaws don't go unnoticed, by enabli 1683 occur. This will allow people with 1684 are going wrong, so that they might 1685 it. 1686 1687 Unfortunately, on some models of so 1688 a fully seeded CRNG is extremely di 1689 result in dmesg getting spammed for 1690 time. This is really bad from a se 1691 so architecture maintainers really 1692 to get the CRNG seeded sooner after 1693 However, since users cannot do anyt 1694 address this, by default this optio 1695 1696 Say Y here if you want to receive w 1697 unseeded randomness. This will be 1698 those developers interested in impr 1699 Linux kernels running on their arch 1700 subarchitecture). 1701 1702 config DEBUG_KOBJECT 1703 bool "kobject debugging" 1704 depends on DEBUG_KERNEL 1705 help 1706 If you say Y here, some extra kobje 1707 to the syslog. 1708 1709 config DEBUG_KOBJECT_RELEASE 1710 bool "kobject release debugging" 1711 depends on DEBUG_OBJECTS_TIMERS 1712 help 1713 kobjects are reference counted obje 1714 last reference count put is not pre 1715 live on past the point at which a d 1716 initial reference to the kobject ga 1717 example of this would be a struct d 1718 unregistered. 1719 1720 However, some buggy drivers assume 1721 the memory backing the kobject can 1722 goes completely against the princip 1723 1724 If you say Y here, the kernel will 1725 on the last reference count to impr 1726 kind of kobject release bug. 1727 1728 config HAVE_DEBUG_BUGVERBOSE 1729 bool 1730 1731 menu "Debug kernel data structures" 1732 1733 config DEBUG_LIST 1734 bool "Debug linked list manipulation" 1735 depends on DEBUG_KERNEL 1736 select LIST_HARDENED 1737 help 1738 Enable this to turn on extended che 1739 routines. 1740 1741 This option trades better quality e 1742 is more suitable for kernel debuggi 1743 you should only enable CONFIG_LIST_ 1744 1745 If unsure, say N. 1746 1747 config DEBUG_PLIST 1748 bool "Debug priority linked list mani 1749 depends on DEBUG_KERNEL 1750 help 1751 Enable this to turn on extended che 1752 linked-list (plist) walking routine 1753 list multiple times during each man 1754 1755 If unsure, say N. 1756 1757 config DEBUG_SG 1758 bool "Debug SG table operations" 1759 depends on DEBUG_KERNEL 1760 help 1761 Enable this to turn on checks on sc 1762 help find problems with drivers tha 1763 their sg tables. 1764 1765 If unsure, say N. 1766 1767 config DEBUG_NOTIFIERS 1768 bool "Debug notifier call chains" 1769 depends on DEBUG_KERNEL 1770 help 1771 Enable this to turn on sanity check 1772 This is most useful for kernel deve 1773 modules properly unregister themsel 1774 This is a relatively cheap check bu 1775 performance, say N. 1776 1777 config DEBUG_CLOSURES 1778 bool "Debug closures (bcache async wi 1779 depends on CLOSURES 1780 select DEBUG_FS 1781 help 1782 Keeps all active closures in a link 1783 interface to list them, which makes 1784 operations that get stuck. 1785 1786 config DEBUG_MAPLE_TREE 1787 bool "Debug maple trees" 1788 depends on DEBUG_KERNEL 1789 help 1790 Enable maple tree debugging informa 1791 1792 If unsure, say N. 1793 1794 endmenu 1795 1796 source "kernel/rcu/Kconfig.debug" 1797 1798 config DEBUG_WQ_FORCE_RR_CPU 1799 bool "Force round-robin CPU selection 1800 depends on DEBUG_KERNEL 1801 default n 1802 help 1803 Workqueue used to implicitly guaran 1804 without explicit CPU specified are 1805 guarantee is no longer true and whi 1806 preferred work items may be put on 1807 parameter "workqueue.debug_force_rr 1808 round-robin CPU selection to flush 1809 now broken guarantee. This config 1810 feature by default. When enabled, 1811 be impacted. 1812 1813 config CPU_HOTPLUG_STATE_CONTROL 1814 bool "Enable CPU hotplug state contro 1815 depends on DEBUG_KERNEL 1816 depends on HOTPLUG_CPU 1817 default n 1818 help 1819 Allows to write steps between "offl 1820 sysfs target file so states can be 1821 option for now as the hotplug machi 1822 restarted at arbitrary points yet. 1823 1824 Say N if your are unsure. 1825 1826 config LATENCYTOP 1827 bool "Latency measuring infrastructur 1828 depends on DEBUG_KERNEL 1829 depends on STACKTRACE_SUPPORT 1830 depends on PROC_FS 1831 depends on FRAME_POINTER || MIPS || P 1832 select KALLSYMS 1833 select KALLSYMS_ALL 1834 select STACKTRACE 1835 select SCHEDSTATS 1836 help 1837 Enable this option if you want to u 1838 to find out which userspace is bloc 1839 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" 1851 1852 config PROVIDE_OHCI1394_DMA_INIT 1853 bool "Remote debugging over FireWire 1854 depends on PCI && X86 1855 help 1856 If you want to debug problems which 1857 on boot and the crashing machine ha 1858 this feature to remotely access the 1859 over FireWire. This employs remote 1860 specification which is now the stan 1861 1862 With remote DMA, you can monitor th 1863 firescope and access all memory bel 1864 Even controlling a kernel debugger 1865 1866 Usage: 1867 1868 If ohci1394_dma=early is used as bo 1869 all OHCI1394 controllers which are 1870 1871 As all changes to the FireWire bus 1872 devices cause a bus reset and there 1873 devices, be sure to have the cable 1874 the debugging host before booting t 1875 1876 This code (~1k) is freed after boot 1877 in charge of the OHCI-1394 controll 1878 1879 See Documentation/core-api/debuggin 1880 1881 source "samples/Kconfig" 1882 1883 config ARCH_HAS_DEVMEM_IS_ALLOWED 1884 bool 1885 1886 config STRICT_DEVMEM 1887 bool "Filter access to /dev/mem" 1888 depends on MMU && DEVMEM 1889 depends on ARCH_HAS_DEVMEM_IS_ALLOWED 1890 default y if PPC || X86 || ARM64 1891 help 1892 If this option is disabled, you all 1893 of memory, including kernel and use 1894 access to this is obviously disastr 1895 be used by people debugging the ker 1896 enabled, even in this case there ar 1897 use due to the cache aliasing requi 1898 1899 If this option is switched on, and 1900 file only allows userspace access t 1901 data regions. This is sufficient f 1902 users of /dev/mem. 1903 1904 If in doubt, say Y. 1905 1906 config IO_STRICT_DEVMEM 1907 bool "Filter I/O access to /dev/mem" 1908 depends on STRICT_DEVMEM 1909 help 1910 If this option is disabled, you all 1911 io-memory regardless of whether a d 1912 range. Accidental access to this i 1913 specific access can be used by peop 1914 1915 If this option is switched on, the 1916 userspace access to *idle* io-memor 1917 may break traditional users of /dev 1918 if the driver using a given range c 1919 1920 If in doubt, say Y. 1921 1922 menu "$(SRCARCH) Debugging" 1923 1924 source "arch/$(SRCARCH)/Kconfig.debug" 1925 1926 endmenu 1927 1928 menu "Kernel Testing and Coverage" 1929 1930 source "lib/kunit/Kconfig" 1931 1932 config NOTIFIER_ERROR_INJECTION 1933 tristate "Notifier error injection" 1934 depends on DEBUG_KERNEL 1935 select DEBUG_FS 1936 help 1937 This option provides the ability to 1938 specified notifier chain callbacks. 1939 handling of notifier call chain fai 1940 1941 Say N if unsure. 1942 1943 config PM_NOTIFIER_ERROR_INJECT 1944 tristate "PM notifier error injection 1945 depends on PM && NOTIFIER_ERROR_INJEC 1946 default m if PM_DEBUG 1947 help 1948 This option provides the ability to 1949 PM notifier chain callbacks. It is 1950 interface /sys/kernel/debug/notifie 1951 1952 If the notifier call chain should b 1953 notified, write the error code to " 1954 1955 Example: Inject PM suspend error (- 1956 1957 # cd /sys/kernel/debug/notifier-err 1958 # echo -12 > actions/PM_SUSPEND_PRE 1959 # echo mem > /sys/power/state 1960 bash: echo: write error: Cannot all 1961 1962 To compile this code as a module, c 1963 be called pm-notifier-error-inject. 1964 1965 If unsure, say N. 1966 1967 config OF_RECONFIG_NOTIFIER_ERROR_INJECT 1968 tristate "OF reconfig notifier error 1969 depends on OF_DYNAMIC && NOTIFIER_ERR 1970 help 1971 This option provides the ability to 1972 OF reconfig notifier chain callback 1973 through debugfs interface under 1974 /sys/kernel/debug/notifier-error-in 1975 1976 If the notifier call chain should b 1977 notified, write the error code to " 1978 1979 To compile this code as a module, c 1980 be called of-reconfig-notifier-erro 1981 1982 If unsure, say N. 1983 1984 config NETDEV_NOTIFIER_ERROR_INJECT 1985 tristate "Netdev notifier error injec 1986 depends on NET && NOTIFIER_ERROR_INJE 1987 help 1988 This option provides the ability to 1989 netdevice notifier chain callbacks. 1990 interface /sys/kernel/debug/notifie 1991 1992 If the notifier call chain should b 1993 notified, write the error code to " 1994 1995 Example: Inject netdevice mtu chang 1996 1997 # cd /sys/kernel/debug/notifier-err 1998 # echo -22 > actions/NETDEV_CHANGEM 1999 # ip link set eth0 mtu 1024 2000 RTNETLINK answers: Invalid argument 2001 2002 To compile this code as a module, c 2003 be called netdev-notifier-error-inj 2004 2005 If unsure, say N. 2006 2007 config FUNCTION_ERROR_INJECTION 2008 bool "Fault-injections of functions" 2009 depends on HAVE_FUNCTION_ERROR_INJECT 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 2017 config FAULT_INJECTION 2018 bool "Fault-injection framework" 2019 depends on DEBUG_KERNEL 2020 help 2021 Provide fault-injection framework. 2022 For more details, see Documentation 2023 2024 config FAILSLAB 2025 bool "Fault-injection capability for 2026 depends on FAULT_INJECTION 2027 help 2028 Provide fault-injection capability 2029 2030 config FAIL_PAGE_ALLOC 2031 bool "Fault-injection capability for 2032 depends on FAULT_INJECTION 2033 help 2034 Provide fault-injection capability 2035 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 2044 bool "Fault-injection capability for 2045 depends on FAULT_INJECTION && BLOCK 2046 help 2047 Provide fault-injection capability 2048 2049 config FAIL_IO_TIMEOUT 2050 bool "Fault-injection capability for 2051 depends on FAULT_INJECTION && BLOCK 2052 help 2053 Provide fault-injection capability 2054 will make the block layer "forget" 2055 thus exercising the error handling. 2056 2057 Only works with drivers that use th 2058 for others it won't do anything. 2059 2060 config FAIL_FUTEX 2061 bool "Fault-injection capability for 2062 select DEBUG_FS 2063 depends on FAULT_INJECTION && FUTEX 2064 help 2065 Provide fault-injection capability 2066 2067 config FAULT_INJECTION_DEBUG_FS 2068 bool "Debugfs entries for fault-injec 2069 depends on FAULT_INJECTION && SYSFS & 2070 help 2071 Enable configuration of fault-injec 2072 2073 config FAIL_FUNCTION 2074 bool "Fault-injection capability for 2075 depends on FAULT_INJECTION_DEBUG_FS & 2076 help 2077 Provide function-based fault-inject 2078 This will allow you to override a s 2079 with given return value. As a resul 2080 an error value and have to handle i 2081 error handling in various subsystem 2082 2083 config FAIL_MMC_REQUEST 2084 bool "Fault-injection capability for 2085 depends on FAULT_INJECTION_DEBUG_FS & 2086 help 2087 Provide fault-injection capability 2088 This will make the mmc core return 2089 useful to test the error handling i 2090 and to test how the mmc host driver 2091 the block device. 2092 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 2112 bool "stacktrace filter for fault-inj 2113 depends on FAULT_INJECTION 2114 depends on (FAULT_INJECTION_DEBUG_FS 2115 select STACKTRACE 2116 depends on FRAME_POINTER || MIPS || P 2117 help 2118 Provide stacktrace filter for fault 2119 2120 config ARCH_HAS_KCOV 2121 bool 2122 help 2123 An architecture should select this 2124 build and run with CONFIG_KCOV. Thi 2125 disabling instrumentation for some 2126 2127 config CC_HAS_SANCOV_TRACE_PC 2128 def_bool $(cc-option,-fsanitize-cover 2129 2130 2131 config KCOV 2132 bool "Code coverage for fuzzing" 2133 depends on ARCH_HAS_KCOV 2134 depends on CC_HAS_SANCOV_TRACE_PC || 2135 depends on !ARCH_WANTS_NO_INSTR || HA 2136 GCC_VERSION >= 120000 || C 2137 select DEBUG_FS 2138 select GCC_PLUGIN_SANCOV if !CC_HAS_S 2139 select OBJTOOL if HAVE_NOINSTR_HACK 2140 help 2141 KCOV exposes kernel code coverage i 2142 for coverage-guided fuzzing (random 2143 2144 For more details, see Documentation 2145 2146 config KCOV_ENABLE_COMPARISONS 2147 bool "Enable comparison operands coll 2148 depends on KCOV 2149 depends on $(cc-option,-fsanitize-cov 2150 help 2151 KCOV also exposes operands of every 2152 code along with operand sizes and P 2153 These operands can be used by fuzzi 2154 of fuzzing coverage. 2155 2156 config KCOV_INSTRUMENT_ALL 2157 bool "Instrument all code by default" 2158 depends on KCOV 2159 default y 2160 help 2161 If you are doing generic system cal 2162 then you will want to instrument th 2163 say y here. If you are doing more t 2164 filesystem fuzzing with AFL) then y 2165 for more specific subsets of files, 2166 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 2177 bool "Runtime Testing" 2178 default y 2179 2180 if RUNTIME_TESTING_MENU 2181 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 2218 tristate "Linux Kernel Dump Test Tool 2219 depends on DEBUG_FS 2220 help 2221 This module enables testing of the di 2222 inducing system failures at predefine 2223 If you don't need it: say N 2224 Choose M here to compile this code as 2225 called lkdtm. 2226 2227 Documentation on how to use the modul 2228 Documentation/fault-injection/provoke 2229 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 2243 tristate "Linked list sorting test" i 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 2256 help 2257 Enable this to turn on min heap fun 2258 executed only once during system bo 2259 or at module load time. 2260 2261 If unsure, say N. 2262 2263 config TEST_SORT 2264 tristate "Array-based sort test" if ! 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 2276 help 2277 Enable this to turn on 'do_div()' f 2278 executed only once during system bo 2279 or at module load time. 2280 2281 If unsure, say N. 2282 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 2296 tristate "Kprobes sanity tests" if !K 2297 depends on DEBUG_KERNEL 2298 depends on KPROBES 2299 depends on KUNIT 2300 select STACKTRACE if ARCH_CORRECT_STA 2301 default KUNIT_ALL_TESTS 2302 help 2303 This option provides for testing ba 2304 boot. Samples of kprobe and kretpro 2305 verified for functionality. 2306 2307 Say N if you are unsure. 2308 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 2322 tristate "Self test for the backtrace 2323 depends on DEBUG_KERNEL 2324 help 2325 This option provides a kernel modul 2326 the kernel stack backtrace code. Th 2327 for distributions or general kernel 2328 developers working on architecture 2329 2330 Note that if you want to also test 2331 have to enable STACKTRACE as well. 2332 2333 Say N if you are unsure. 2334 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 2346 tristate "Red-Black tree test" 2347 depends on DEBUG_KERNEL 2348 help 2349 A benchmark measuring the performan 2350 Also includes rbtree invariant chec 2351 2352 config REED_SOLOMON_TEST 2353 tristate "Reed-Solomon library test" 2354 depends on DEBUG_KERNEL || m 2355 select REED_SOLOMON 2356 select REED_SOLOMON_ENC16 2357 select REED_SOLOMON_DEC16 2358 help 2359 This option enables the self-test f 2360 or at module load time. 2361 2362 If unsure, say N. 2363 2364 config INTERVAL_TREE_TEST 2365 tristate "Interval tree test" 2366 depends on DEBUG_KERNEL 2367 select INTERVAL_TREE 2368 help 2369 A benchmark measuring the performan 2370 2371 config PERCPU_TEST 2372 tristate "Per cpu operations test" 2373 depends on m && DEBUG_KERNEL 2374 help 2375 Enable this option to build test mo 2376 operations. 2377 2378 If unsure, say N. 2379 2380 config ATOMIC64_SELFTEST 2381 tristate "Perform an atomic64_t self- 2382 help 2383 Enable this option to test the atom 2384 at module load time. 2385 2386 If unsure, say N. 2387 2388 config ASYNC_RAID6_TEST 2389 tristate "Self test for hardware acce 2390 depends on ASYNC_RAID6_RECOV 2391 select ASYNC_MEMCPY 2392 help 2393 This is a one-shot self test that p 2394 recovery of all the possible two di 2395 N-disk array. Recovery is performe 2396 raid6 recovery routines, and will o 2397 engine if one is available. 2398 2399 If unsure, say N. 2400 2401 config TEST_HEXDUMP 2402 tristate "Test functions located in t 2403 2404 config STRING_KUNIT_TEST 2405 tristate "KUnit test string functions 2406 depends on KUNIT 2407 default KUNIT_ALL_TESTS 2408 2409 config STRING_HELPERS_KUNIT_TEST 2410 tristate "KUnit test string helpers a 2411 depends on KUNIT 2412 default KUNIT_ALL_TESTS 2413 2414 config TEST_KSTRTOX 2415 tristate "Test kstrto*() family of fu 2416 2417 config TEST_PRINTF 2418 tristate "Test printf() family of fun 2419 2420 config TEST_SCANF 2421 tristate "Test scanf() family of func 2422 2423 config TEST_BITMAP 2424 tristate "Test bitmap_*() family of f 2425 help 2426 Enable this option to test the bitm 2427 2428 If unsure, say N. 2429 2430 config TEST_UUID 2431 tristate "Test functions located in t 2432 2433 config TEST_XARRAY 2434 tristate "Test the XArray code at run 2435 2436 config TEST_MAPLE_TREE 2437 tristate "Test the Maple Tree code at 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 2445 config TEST_RHASHTABLE 2446 tristate "Perform selftest on resizab 2447 help 2448 Enable this option to test the rhas 2449 2450 If unsure, say N. 2451 2452 config TEST_IDA 2453 tristate "Perform selftest on IDA fun 2454 2455 config TEST_PARMAN 2456 tristate "Perform selftest on priorit 2457 depends on PARMAN 2458 help 2459 Enable this option to test priority 2460 (or module load). 2461 2462 If unsure, say N. 2463 2464 config TEST_IRQ_TIMINGS 2465 bool "IRQ timings selftest" 2466 depends on IRQ_TIMINGS 2467 help 2468 Enable this option to test the irq 2469 2470 If unsure, say N. 2471 2472 config TEST_LKM 2473 tristate "Test module loading with 'h 2474 depends on m 2475 help 2476 This builds the "test_module" modul 2477 on printk when loaded. It is design 2478 evaluation of the module loading su 2479 validating module verification). It 2480 and will not normally be loaded by 2481 requested by name. 2482 2483 If unsure, say N. 2484 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 2498 tristate "Test module for stress/perf 2499 default n 2500 depends on MMU 2501 depends on m 2502 help 2503 This builds the "test_vmalloc" modu 2504 stress and performance analysis. So 2505 subsystem can be evaluated from per 2506 of view. 2507 2508 If unsure, say N. 2509 2510 config TEST_BPF 2511 tristate "Test BPF filter functionali 2512 depends on m && NET 2513 help 2514 This builds the "test_bpf" module t 2515 against the BPF interpreter or BPF 2516 current setting. This is in particu 2517 development, but also to run regres 2518 the interpreter code. It also enabl 2519 verifier used by user space verifie 2520 2521 If unsure, say N. 2522 2523 config TEST_BLACKHOLE_DEV 2524 tristate "Test blackhole netdev funct 2525 depends on m && NET 2526 help 2527 This builds the "test_blackhole_dev 2528 data path through this blackhole ne 2529 2530 If unsure, say N. 2531 2532 config FIND_BIT_BENCHMARK 2533 tristate "Test find_bit functions" 2534 help 2535 This builds the "test_find_bit" mod 2536 functions performance. 2537 2538 If unsure, say N. 2539 2540 config TEST_FIRMWARE 2541 tristate "Test firmware loading via u 2542 depends on FW_LOADER 2543 help 2544 This builds the "test_firmware" mod 2545 interface for testing firmware load 2546 control the triggering of firmware 2547 actual firmware-using device. The c 2548 userspace. 2549 2550 If unsure, say N. 2551 2552 config TEST_SYSCTL 2553 tristate "sysctl test driver" 2554 depends on PROC_SYSCTL 2555 help 2556 This builds the "test_sysctl" modul 2557 proc sysctl interfaces available to 2558 production knobs which might alter 2559 2560 If unsure, say N. 2561 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 2628 tristate "KUnit test for sysctl" if ! 2629 depends on KUNIT 2630 default KUNIT_ALL_TESTS 2631 help 2632 This builds the proc sysctl unit te 2633 Tests the API contract and implemen 2634 For more information on KUnit and u 2635 to the KUnit documentation in Docum 2636 2637 If unsure, say N. 2638 2639 config LIST_KUNIT_TEST 2640 tristate "KUnit Test for Kernel Linke 2641 depends on KUNIT 2642 default KUNIT_ALL_TESTS 2643 help 2644 This builds the linked list KUnit t 2645 It tests that the API and basic fun 2646 and associated macros. 2647 2648 KUnit tests run during boot and out 2649 in TAP format (https://testanything 2650 running the KUnit test harness, and 2651 production build. 2652 2653 For more information on KUnit and u 2654 to the KUnit documentation in Docum 2655 2656 If unsure, say N. 2657 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 2817 tristate "udelay test driver" 2818 help 2819 This builds the "udelay_test" modul 2820 that udelay() is working properly. 2821 2822 If unsure, say N. 2823 2824 config TEST_STATIC_KEYS 2825 tristate "Test static keys" 2826 depends on m 2827 help 2828 Test the static key interfaces. 2829 2830 If unsure, say N. 2831 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 2843 tristate "kmod stress tester" 2844 depends on m 2845 depends on NETDEVICES && NET_CORE && 2846 depends on BLOCK 2847 depends on PAGE_SIZE_LESS_THAN_256KB 2848 select TEST_LKM 2849 select XFS_FS 2850 select TUN 2851 select BTRFS_FS 2852 help 2853 Test the kernel's module loading me 2854 support to load modules using the L 2855 This test provides a series of test 2856 2857 Although technically you can either 2858 into the kernel we disallow buildin 2859 it stress tests request_module() an 2860 some issues by taking over precious 2861 module load requests, ultimately th 2862 2863 To run tests run: 2864 2865 tools/testing/selftests/kmod/kmod.s 2866 2867 If unsure, say N. 2868 2869 config TEST_DEBUG_VIRTUAL 2870 tristate "Test CONFIG_DEBUG_VIRTUAL f 2871 depends on DEBUG_VIRTUAL 2872 help 2873 Test the kernel's ability to detect 2874 virt_to_phys() done against the non 2875 kernel's virtual address map. 2876 2877 If unsure, say N. 2878 2879 config TEST_MEMCAT_P 2880 tristate "Test memcat_p() helper func 2881 help 2882 Test the memcat_p() helper for corr 2883 pointer arrays together. 2884 2885 If unsure, say N. 2886 2887 config TEST_OBJAGG 2888 tristate "Perform selftest on object 2889 default n 2890 depends on OBJAGG 2891 help 2892 Enable this option to test object a 2893 (or module load). 2894 2895 config TEST_MEMINIT 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 2901 If unsure, say N. 2902 2903 config TEST_HMM 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 2914 If unsure, say N. 2915 2916 config TEST_FREE_PAGES 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 2925 config TEST_FPU 2926 tristate "Test floating point operati 2927 depends on ARCH_HAS_KERNEL_FPU_SUPPOR 2928 help 2929 Enable this option to add /sys/kern 2930 which will trigger a sequence of fl 2931 for self-testing floating point con 2932 kernel_fpu_begin(). 2933 2934 If unsure, say N. 2935 2936 config TEST_CLOCKSOURCE_WATCHDOG 2937 tristate "Test clocksource watchdog i 2938 depends on CLOCKSOURCE_WATCHDOG 2939 help 2940 Enable this option to create a kern 2941 a test of the clocksource watchdog. 2942 via modprobe or insmod in which cas 2943 loaded, or it may be built in, in w 2944 shortly after boot. 2945 2946 If unsure, say N. 2947 2948 config TEST_OBJPOOL 2949 tristate "Test module for correctness 2950 default n 2951 depends on m && DEBUG_KERNEL 2952 help 2953 This builds the "test_objpool" modu 2954 correctness verification and concur 2955 allocation and reclamation. 2956 2957 If unsure, say N. 2958 2959 endif # RUNTIME_TESTING_MENU 2960 2961 config ARCH_USE_MEMTEST 2962 bool 2963 help 2964 An architecture should select this 2965 during boot process. 2966 2967 config MEMTEST 2968 bool "Memtest" 2969 depends on ARCH_USE_MEMTEST 2970 help 2971 This option adds a kernel parameter 2972 to be set and executed. 2973 memtest=0, mean disabled; -- 2974 memtest=1, mean do 1 test pat 2975 ... 2976 memtest=17, mean do 17 test p 2977 If you are unsure how to answer thi 2978 2979 2980 2981 config HYPERV_TESTING 2982 bool "Microsoft Hyper-V driver testin 2983 default n 2984 depends on HYPERV && DEBUG_FS 2985 help 2986 Select this option to enable Hyper- 2987 2988 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 3053 endmenu # Kernel hacking
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