~hc/RK356X_SDK_RELEASE.git

..	..	@@ -1,3 +1,4 @@
	1	+# SPDX-License-Identifier: GPL-2.0-only
1	2	menu "Kernel hacking"
2	3
3	4	menu "printk and dmesg options"
..	..	@@ -19,14 +20,24 @@
19	20
20	21	config PRINTK_TIME_FROM_ARM_ARCH_TIMER
21	22	bool "Timing from ARM architected timer"
22		- depends on PRINTK_TIME && ARM_ARCH_TIMER
	23	+ depends on PRINTK_TIME && ARM_ARCH_TIMER && NO_GKI
23	24
24		-config PRINTK_PROCESS
25		- bool "Show process information on printks"
	25	+config PRINTK_CALLER
	26	+ bool "Show caller information on printks"
26	27	depends on PRINTK
27	28	help
28		- Selecting this option causes process to be
29		- included in printk output. Or add printk.process=1 at boot-time.
	29	+ Selecting this option causes printk() to add a caller "thread id" (if
	30	+ in task context) or a caller "processor id" (if not in task context)
	31	+ to every message.
	32	+
	33	+ This option is intended for environments where multiple threads
	34	+ concurrently call printk() for many times, for it is difficult to
	35	+ interpret without knowing where these lines (or sometimes individual
	36	+ line which was divided into multiple lines due to race) came from.
	37	+
	38	+ Since toggling after boot makes the code racy, currently there is
	39	+ no option to enable/disable at the kernel command line parameter or
	40	+ sysfs interface.
30	41
31	42	config CONSOLE_LOGLEVEL_DEFAULT
32	43	int "Default console loglevel (1-15)"
..	..	@@ -92,6 +103,7 @@
92	103	default n
93	104	depends on PRINTK
94	105	depends on (DEBUG_FS \|\| PROC_FS)
	106	+ select DYNAMIC_DEBUG_CORE
95	107	help
96	108
97	109	Compiles debug level messages into the kernel, which would not
..	..	@@ -122,8 +134,8 @@
122	134	lineno : line number of the debug statement
123	135	module : module that contains the debug statement
124	136	function : function that contains the debug statement
125		- flags : '=p' means the line is turned 'on' for printing
126		- format : the format used for the debug statement
	137	+ flags : '=p' means the line is turned 'on' for printing
	138	+ format : the format used for the debug statement
127	139
128	140	From a live system:
129	141
..	..	@@ -158,6 +170,35 @@
158	170	See Documentation/admin-guide/dynamic-debug-howto.rst for additional
159	171	information.
160	172
	173	+config DYNAMIC_DEBUG_CORE
	174	+ bool "Enable core function of dynamic debug support"
	175	+ depends on PRINTK
	176	+ depends on (DEBUG_FS \|\| PROC_FS)
	177	+ help
	178	+ Enable core functional support of dynamic debug. It is useful
	179	+ when you want to tie dynamic debug to your kernel modules with
	180	+ DYNAMIC_DEBUG_MODULE defined for each of them, especially for
	181	+ the case of embedded system where the kernel image size is
	182	+ sensitive for people.
	183	+
	184	+config SYMBOLIC_ERRNAME
	185	+ bool "Support symbolic error names in printf"
	186	+ default y if PRINTK
	187	+ help
	188	+ If you say Y here, the kernel's printf implementation will
	189	+ be able to print symbolic error names such as ENOSPC instead
	190	+ of the number 28. It makes the kernel image slightly larger
	191	+ (about 3KB), but can make the kernel logs easier to read.
	192	+
	193	+config DEBUG_BUGVERBOSE
	194	+ bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
	195	+ depends on BUG && (GENERIC_BUG \|\| HAVE_DEBUG_BUGVERBOSE)
	196	+ default y
	197	+ help
	198	+ Say Y here to make BUG() panics output the file name and line number
	199	+ of the BUG call as well as the EIP and oops trace. This aids
	200	+ debugging but costs about 70-100K of memory.
	201	+
161	202	endmenu # "printk and dmesg options"
162	203
163	204	menu "Compile-time checks and compiler options"
..	..	@@ -166,7 +207,7 @@
166	207	bool "Compile the kernel with debug info"
167	208	depends on DEBUG_KERNEL && !COMPILE_TEST
168	209	help
169		- If you say Y here the resulting kernel image will include
	210	+ If you say Y here the resulting kernel image will include
170	211	debugging info resulting in a larger kernel image.
171	212	This adds debug symbols to the kernel and modules (gcc -g), and
172	213	is needed if you intend to use kernel crashdump or binary object
..	..	@@ -175,9 +216,10 @@
175	216
176	217	If unsure, say N.
177	218
	219	+if DEBUG_INFO
	220	+
178	221	config DEBUG_INFO_REDUCED
179	222	bool "Reduce debugging information"
180		- depends on DEBUG_INFO
181	223	help
182	224	If you say Y here gcc is instructed to generate less debugging
183	225	information for structure types. This means that tools that
..	..	@@ -188,9 +230,24 @@
188	230	DEBUG_INFO build and compile times are reduced too.
189	231	Only works with newer gcc versions.
190	232
	233	+config DEBUG_INFO_COMPRESSED
	234	+ bool "Compressed debugging information"
	235	+ depends on $(cc-option,-gz=zlib)
	236	+ depends on $(ld-option,--compress-debug-sections=zlib)
	237	+ help
	238	+ Compress the debug information using zlib. Requires GCC 5.0+ or Clang
	239	+ 5.0+, binutils 2.26+, and zlib.
	240	+
	241	+ Users of dpkg-deb via scripts/package/builddeb may find an increase in
	242	+ size of their debug .deb packages with this config set, due to the
	243	+ debug info being compressed with zlib, then the object files being
	244	+ recompressed with a different compression scheme. But this is still
	245	+ preferable to setting $KDEB_COMPRESS to "none" which would be even
	246	+ larger.
	247	+
191	248	config DEBUG_INFO_SPLIT
192	249	bool "Produce split debuginfo in .dwo files"
193		- depends on DEBUG_INFO
	250	+ depends on $(cc-option,-gsplit-dwarf)
194	251	help
195	252	Generate debug info into separate .dwo files. This significantly
196	253	reduces the build directory size for builds with DEBUG_INFO,
..	..	@@ -205,16 +262,24 @@
205	262
206	263	config DEBUG_INFO_DWARF4
207	264	bool "Generate dwarf4 debuginfo"
208		- depends on DEBUG_INFO
	265	+ depends on $(cc-option,-gdwarf-4)
209	266	help
210	267	Generate dwarf4 debug info. This requires recent versions
211	268	of gcc and gdb. It makes the debug information larger.
212	269	But it significantly improves the success of resolving
213	270	variables in gdb on optimized code.
214	271
	272	+config DEBUG_INFO_BTF
	273	+ bool "Generate BTF typeinfo"
	274	+ depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
	275	+ depends on !GCC_PLUGIN_RANDSTRUCT \|\| COMPILE_TEST
	276	+ help
	277	+ Generate deduplicated BTF type information from DWARF debug info.
	278	+ Turning this on expects presence of pahole tool, which will convert
	279	+ DWARF type info into equivalent deduplicated BTF type info.
	280	+
215	281	config GDB_SCRIPTS
216	282	bool "Provide GDB scripts for kernel debugging"
217		- depends on DEBUG_INFO
218	283	help
219	284	This creates the required links to GDB helper scripts in the
220	285	build directory. If you load vmlinux into gdb, the helper
..	..	@@ -222,6 +287,8 @@
222	287	additional functions are available to analyze a Linux kernel
223	288	instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
224	289	for further details.
	290	+
	291	+endif # DEBUG_INFO
225	292
226	293	config ENABLE_MUST_CHECK
227	294	bool "Enable __must_check logic"
..	..	@@ -232,17 +299,18 @@
232	299	attribute warn_unused_result" messages.
233	300
234	301	config FRAME_WARN
235		- int "Warn for stack frames larger than (needs gcc 4.4)"
	302	+ int "Warn for stack frames larger than"
236	303	range 0 8192
237	304	default 2048 if GCC_PLUGIN_LATENT_ENTROPY
238		- default 1280 if (!64BIT && PARISC)
239		- default 1024 if (!64BIT && !PARISC)
	305	+ default 2048 if PARISC
	306	+ default 1536 if (!64BIT && XTENSA)
	307	+ default 1280 if KASAN && !64BIT
	308	+ default 1024 if !64BIT
240	309	default 2048 if 64BIT
241	310	help
242	311	Tell gcc to warn at build time for stack frames larger than this.
243	312	Setting this too low will cause a lot of warnings.
244	313	Setting it to 0 disables the warning.
245		- Requires gcc 4.4
246	314
247	315	config STRIP_ASM_SYMS
248	316	bool "Strip assembler-generated symbols during link"
..	..	@@ -253,72 +321,23 @@
253	321	get_wchan() and suchlike.
254	322
255	323	config READABLE_ASM
256		- bool "Generate readable assembler code"
257		- depends on DEBUG_KERNEL
258		- help
259		- Disable some compiler optimizations that tend to generate human unreadable
260		- assembler output. This may make the kernel slightly slower, but it helps
261		- to keep kernel developers who have to stare a lot at assembler listings
262		- sane.
263		-
264		-config UNUSED_SYMBOLS
265		- bool "Enable unused/obsolete exported symbols"
266		- default y if X86
	324	+ bool "Generate readable assembler code"
	325	+ depends on DEBUG_KERNEL
267	326	help
268		- Unused but exported symbols make the kernel needlessly bigger. For
269		- that reason most of these unused exports will soon be removed. This
270		- option is provided temporarily to provide a transition period in case
271		- some external kernel module needs one of these symbols anyway. If you
272		- encounter such a case in your module, consider if you are actually
273		- using the right API. (rationale: since nobody in the kernel is using
274		- this in a module, there is a pretty good chance it's actually the
275		- wrong interface to use). If you really need the symbol, please send a
276		- mail to the linux kernel mailing list mentioning the symbol and why
277		- you really need it, and what the merge plan to the mainline kernel for
278		- your module is.
	327	+ Disable some compiler optimizations that tend to generate human unreadable
	328	+ assembler output. This may make the kernel slightly slower, but it helps
	329	+ to keep kernel developers who have to stare a lot at assembler listings
	330	+ sane.
279	331
280		-config PAGE_OWNER
281		- bool "Track page owner"
282		- depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
283		- select DEBUG_FS
284		- select STACKTRACE
285		- select STACKDEPOT
286		- select PAGE_EXTENSION
287		- help
288		- This keeps track of what call chain is the owner of a page, may
289		- help to find bare alloc_page(s) leaks. Even if you include this
290		- feature on your build, it is disabled in default. You should pass
291		- "page_owner=on" to boot parameter in order to enable it. Eats
292		- a fair amount of memory if enabled. See tools/vm/page_owner_sort.c
293		- for user-space helper.
294		-
295		- If unsure, say N.
296		-
297		-config DEBUG_FS
298		- bool "Debug Filesystem"
299		- help
300		- debugfs is a virtual file system that kernel developers use to put
301		- debugging files into. Enable this option to be able to read and
302		- write to these files.
303		-
304		- For detailed documentation on the debugfs API, see
305		- Documentation/filesystems/.
306		-
307		- If unsure, say N.
308		-
309		-config HEADERS_CHECK
310		- bool "Run 'make headers_check' when building vmlinux"
	332	+config HEADERS_INSTALL
	333	+ bool "Install uapi headers to usr/include"
311	334	depends on !UML
312	335	help
313		- This option will extract the user-visible kernel headers whenever
314		- building the kernel, and will run basic sanity checks on them to
315		- ensure that exported files do not attempt to include files which
316		- were not exported, etc.
317		-
318		- If you're making modifications to header files which are
319		- relevant for userspace, say 'Y', and check the headers
320		- exported to $(INSTALL_HDR_PATH) (usually 'usr/include' in
321		- your build tree), to make sure they're suitable.
	336	+ This option will install uapi headers (headers exported to user-space)
	337	+ into the usr/include directory for use during the kernel build.
	338	+ This is unneeded for building the kernel itself, but needed for some
	339	+ user-space program samples. It is also needed by some features such
	340	+ as uapi header sanity checks.
322	341
323	342	config DEBUG_SECTION_MISMATCH
324	343	bool "Enable full Section mismatch analysis"
..	..	@@ -333,23 +352,13 @@
333	352	which results in the code/data being placed in specific sections.
334	353	The section mismatch analysis is always performed after a full
335	354	kernel build, and enabling this option causes the following
336		- additional steps to occur:
	355	+ additional step to occur:
337	356	- Add the option -fno-inline-functions-called-once to gcc commands.
338	357	When inlining a function annotated with __init in a non-init
339	358	function, we would lose the section information and thus
340	359	the analysis would not catch the illegal reference.
341	360	This option tells gcc to inline less (but it does result in
342	361	a larger kernel).
343		- - Run the section mismatch analysis for each module/built-in.a file.
344		- When we run the section mismatch analysis on vmlinux.o, we
345		- lose valuable information about where the mismatch was
346		- introduced.
347		- Running the analysis for each module/built-in.a file
348		- tells where the mismatch happens much closer to the
349		- source. The drawback is that the same mismatch is
350		- reported at least twice.
351		- - Enable verbose reporting from modpost in order to help resolve
352		- the section mismatches that are reported.
353	362
354	363	config SECTION_MISMATCH_WARN_ONLY
355	364	bool "Make section mismatch errors non-fatal"
..	..	@@ -359,6 +368,17 @@
359	368	section mismatch, instead of just throwing warnings.
360	369
361	370	If unsure, say Y.
	371	+
	372	+config DEBUG_FORCE_FUNCTION_ALIGN_32B
	373	+ bool "Force all function address 32B aligned" if EXPERT
	374	+ help
	375	+ There are cases that a commit from one domain changes the function
	376	+ address alignment of other domains, and cause magic performance
	377	+ bump (regression or improvement). Enable this option will help to
	378	+ verify if the bump is caused by function alignment changes, while
	379	+ it will slightly increase the kernel size and affect icache usage.
	380	+
	381	+ It is mainly for debug and performance tuning use.
362	382
363	383	#
364	384	# Select this config option from the architecture Kconfig, if it
..	..	@@ -392,6 +412,11 @@
392	412	For more information, see
393	413	tools/objtool/Documentation/stack-validation.txt.
394	414
	415	+config VMLINUX_VALIDATION
	416	+ bool
	417	+ depends on STACK_VALIDATION && DEBUG_ENTRY && !PARAVIRT
	418	+ default y
	419	+
395	420	config DEBUG_FORCE_WEAK_PER_CPU
396	421	bool "Force weak per-cpu definitions"
397	422	depends on DEBUG_KERNEL
..	..	@@ -408,6 +433,8 @@
408	433	option forces all percpu variables to be defined as weak.
409	434
410	435	endmenu # "Compiler options"
	436	+
	437	+menu "Generic Kernel Debugging Instruments"
411	438
412	439	config MAGIC_SYSRQ
413	440	bool "Magic SysRq key"
..	..	@@ -442,15 +469,84 @@
442	469	This option allows you to decide whether you want to enable the
443	470	magic SysRq key.
444	471
	472	+config MAGIC_SYSRQ_SERIAL_SEQUENCE
	473	+ string "Char sequence that enables magic SysRq over serial"
	474	+ depends on MAGIC_SYSRQ_SERIAL
	475	+ default ""
	476	+ help
	477	+ Specifies a sequence of characters that can follow BREAK to enable
	478	+ SysRq on a serial console.
	479	+
	480	+ If unsure, leave an empty string and the option will not be enabled.
	481	+
	482	+config DEBUG_FS
	483	+ bool "Debug Filesystem"
	484	+ help
	485	+ debugfs is a virtual file system that kernel developers use to put
	486	+ debugging files into. Enable this option to be able to read and
	487	+ write to these files.
	488	+
	489	+ For detailed documentation on the debugfs API, see
	490	+ Documentation/filesystems/.
	491	+
	492	+ If unsure, say N.
	493	+
	494	+choice
	495	+ prompt "Debugfs default access"
	496	+ depends on DEBUG_FS
	497	+ default DEBUG_FS_ALLOW_ALL
	498	+ help
	499	+ This selects the default access restrictions for debugfs.
	500	+ It can be overridden with kernel command line option
	501	+ debugfs=[on,no-mount,off]. The restrictions apply for API access
	502	+ and filesystem registration.
	503	+
	504	+config DEBUG_FS_ALLOW_ALL
	505	+ bool "Access normal"
	506	+ help
	507	+ No restrictions apply. Both API and filesystem registration
	508	+ is on. This is the normal default operation.
	509	+
	510	+config DEBUG_FS_DISALLOW_MOUNT
	511	+ bool "Do not register debugfs as filesystem"
	512	+ help
	513	+ The API is open but filesystem is not loaded. Clients can still do
	514	+ their work and read with debug tools that do not need
	515	+ debugfs filesystem.
	516	+
	517	+config DEBUG_FS_ALLOW_NONE
	518	+ bool "No access"
	519	+ help
	520	+ Access is off. Clients get -PERM when trying to create nodes in
	521	+ debugfs tree and debugfs is not registered as a filesystem.
	522	+ Client can then back-off or continue without debugfs access.
	523	+
	524	+endchoice
	525	+
	526	+source "lib/Kconfig.kgdb"
	527	+source "lib/Kconfig.ubsan"
	528	+source "lib/Kconfig.kcsan"
	529	+
	530	+endmenu
	531	+
445	532	config DEBUG_KERNEL
446	533	bool "Kernel debugging"
447	534	help
448	535	Say Y here if you are developing drivers or trying to debug and
449	536	identify kernel problems.
450	537
	538	+config DEBUG_MISC
	539	+ bool "Miscellaneous debug code"
	540	+ default DEBUG_KERNEL
	541	+ depends on DEBUG_KERNEL
	542	+ help
	543	+ Say Y here if you need to enable miscellaneous debug code that should
	544	+ be under a more specific debug option but isn't.
	545	+
	546	+
451	547	menu "Memory Debugging"
452	548
453		-source mm/Kconfig.debug
	549	+source "mm/Kconfig.debug"
454	550
455	551	config DEBUG_OBJECTS
456	552	bool "Debug object operations"
..	..	@@ -507,11 +603,11 @@
507	603
508	604	config DEBUG_OBJECTS_ENABLE_DEFAULT
509	605	int "debug_objects bootup default value (0-1)"
510		- range 0 1
511		- default "1"
512		- depends on DEBUG_OBJECTS
513		- help
514		- Debug objects boot parameter default value
	606	+ range 0 1
	607	+ default "1"
	608	+ depends on DEBUG_OBJECTS
	609	+ help
	610	+ Debug objects boot parameter default value
515	611
516	612	config DEBUG_SLAB
517	613	bool "Debug slab memory allocations"
..	..	@@ -520,10 +616,6 @@
520	616	Say Y here to have the kernel do limited verification on memory
521	617	allocation as well as poisoning memory on free to catch use of freed
522	618	memory. This can make kmalloc/kfree-intensive workloads much slower.
523		-
524		-config DEBUG_SLAB_LEAK
525		- bool "Memory leak debugging"
526		- depends on DEBUG_SLAB
527	619
528	620	config SLUB_DEBUG_ON
529	621	bool "SLUB debugging on by default"
..	..	@@ -577,17 +669,18 @@
577	669	In order to access the kmemleak file, debugfs needs to be
578	670	mounted (usually at /sys/kernel/debug).
579	671
580		-config DEBUG_KMEMLEAK_EARLY_LOG_SIZE
581		- int "Maximum kmemleak early log entries"
	672	+config DEBUG_KMEMLEAK_MEM_POOL_SIZE
	673	+ int "Kmemleak memory pool size"
582	674	depends on DEBUG_KMEMLEAK
583		- range 200 40000
	675	+ range 200 1000000
584	676	default 16000
585	677	help
586	678	Kmemleak must track all the memory allocations to avoid
587	679	reporting false positives. Since memory may be allocated or
588		- freed before kmemleak is initialised, an early log buffer is
589		- used to store these actions. If kmemleak reports "early log
590		- buffer exceeded", please increase this value.
	680	+ freed before kmemleak is fully initialised, use a static pool
	681	+ of metadata objects to track such callbacks. After kmemleak is
	682	+ fully initialised, this memory pool acts as an emergency one
	683	+ if slab allocations fail.
591	684
592	685	config DEBUG_KMEMLEAK_TEST
593	686	tristate "Simple test for the kernel memory leak detector"
..	..	@@ -604,6 +697,21 @@
604	697	Say Y here to disable kmemleak by default. It can then be enabled
605	698	on the command line via kmemleak=on.
606	699
	700	+config DEBUG_KMEMLEAK_AUTO_SCAN
	701	+ bool "Enable kmemleak auto scan thread on boot up"
	702	+ default y
	703	+ depends on DEBUG_KMEMLEAK
	704	+ help
	705	+ Depending on the cpu, kmemleak scan may be cpu intensive and can
	706	+ stall user tasks at times. This option enables/disables automatic
	707	+ kmemleak scan at boot up.
	708	+
	709	+ Say N here to disable kmemleak auto scan thread to stop automatic
	710	+ scanning. Disabling this option disables automatic reporting of
	711	+ memory leaks.
	712	+
	713	+ If unsure, say Y.
	714	+
607	715	config DEBUG_STACK_USAGE
608	716	bool "Stack utilization instrumentation"
609	717	depends on DEBUG_KERNEL && !IA64
..	..	@@ -613,12 +721,30 @@
613	721
614	722	This option will slow down process creation somewhat.
615	723
	724	+config SCHED_STACK_END_CHECK
	725	+ bool "Detect stack corruption on calls to schedule()"
	726	+ depends on DEBUG_KERNEL
	727	+ default n
	728	+ help
	729	+ This option checks for a stack overrun on calls to schedule().
	730	+ If the stack end location is found to be over written always panic as
	731	+ the content of the corrupted region can no longer be trusted.
	732	+ This is to ensure no erroneous behaviour occurs which could result in
	733	+ data corruption or a sporadic crash at a later stage once the region
	734	+ is examined. The runtime overhead introduced is minimal.
	735	+
	736	+config ARCH_HAS_DEBUG_VM_PGTABLE
	737	+ bool
	738	+ help
	739	+ An architecture should select this when it can successfully
	740	+ build and run DEBUG_VM_PGTABLE.
	741	+
616	742	config DEBUG_VM
617	743	bool "Debug VM"
618	744	depends on DEBUG_KERNEL
619	745	help
620	746	Enable this to turn on extended checks in the virtual-memory system
621		- that may impact performance.
	747	+ that may impact performance.
622	748
623	749	If unsure, say N.
624	750
..	..	@@ -645,6 +771,22 @@
645	771	depends on DEBUG_VM
646	772	help
647	773	Enables extra validation on page flags operations.
	774	+
	775	+ If unsure, say N.
	776	+
	777	+config DEBUG_VM_PGTABLE
	778	+ bool "Debug arch page table for semantics compliance"
	779	+ depends on MMU
	780	+ depends on ARCH_HAS_DEBUG_VM_PGTABLE
	781	+ default y if DEBUG_VM
	782	+ help
	783	+ This option provides a debug method which can be used to test
	784	+ architecture page table helper functions on various platforms in
	785	+ verifying if they comply with expected generic MM semantics. This
	786	+ will help architecture code in making sure that any changes or
	787	+ new additions of these helpers still conform to expected
	788	+ semantics of the generic MM. Platforms will have to opt in for
	789	+ this through ARCH_HAS_DEBUG_VM_PGTABLE.
648	790
649	791	If unsure, say N.
650	792
..	..	@@ -726,7 +868,7 @@
726	868	config DEBUG_STACKOVERFLOW
727	869	bool "Check for stack overflows"
728	870	depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
729		- ---help---
	871	+ help
730	872	Say Y here if you want to check for overflows of kernel, IRQ
731	873	and exception stacks (if your architecture uses them). This
732	874	option will show detailed messages if free stack space drops
..	..	@@ -742,66 +884,48 @@
742	884	If in doubt, say "N".
743	885
744	886	source "lib/Kconfig.kasan"
	887	+source "lib/Kconfig.kfence"
745	888
746	889	endmenu # "Memory Debugging"
747		-
748		-config ARCH_HAS_KCOV
749		- bool
750		- help
751		- An architecture should select this when it can successfully
752		- build and run with CONFIG_KCOV. This typically requires
753		- disabling instrumentation for some early boot code.
754		-
755		-config CC_HAS_SANCOV_TRACE_PC
756		- def_bool $(cc-option,-fsanitize-coverage=trace-pc)
757		-
758		-config KCOV
759		- bool "Code coverage for fuzzing"
760		- depends on ARCH_HAS_KCOV
761		- depends on CC_HAS_SANCOV_TRACE_PC \|\| GCC_PLUGINS
762		- select DEBUG_FS
763		- select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
764		- help
765		- KCOV exposes kernel code coverage information in a form suitable
766		- for coverage-guided fuzzing (randomized testing).
767		-
768		- If RANDOMIZE_BASE is enabled, PC values will not be stable across
769		- different machines and across reboots. If you need stable PC values,
770		- disable RANDOMIZE_BASE.
771		-
772		- For more details, see Documentation/dev-tools/kcov.rst.
773		-
774		-config KCOV_ENABLE_COMPARISONS
775		- bool "Enable comparison operands collection by KCOV"
776		- depends on KCOV
777		- depends on $(cc-option,-fsanitize-coverage=trace-cmp)
778		- help
779		- KCOV also exposes operands of every comparison in the instrumented
780		- code along with operand sizes and PCs of the comparison instructions.
781		- These operands can be used by fuzzing engines to improve the quality
782		- of fuzzing coverage.
783		-
784		-config KCOV_INSTRUMENT_ALL
785		- bool "Instrument all code by default"
786		- depends on KCOV
787		- default y
788		- help
789		- If you are doing generic system call fuzzing (like e.g. syzkaller),
790		- then you will want to instrument the whole kernel and you should
791		- say y here. If you are doing more targeted fuzzing (like e.g.
792		- filesystem fuzzing with AFL) then you will want to enable coverage
793		- for more specific subsets of files, and should say n here.
794	890
795	891	config DEBUG_SHIRQ
796	892	bool "Debug shared IRQ handlers"
797	893	depends on DEBUG_KERNEL
798	894	help
799		- Enable this to generate a spurious interrupt as soon as a shared
800		- interrupt handler is registered, and just before one is deregistered.
801		- Drivers ought to be able to handle interrupts coming in at those
802		- points; some don't and need to be caught.
	895	+ Enable this to generate a spurious interrupt just before a shared
	896	+ interrupt handler is deregistered (generating one when registering
	897	+ is currently disabled). Drivers need to handle this correctly. Some
	898	+ don't and need to be caught.
803	899
804		-menu "Debug Lockups and Hangs"
	900	+menu "Debug Oops, Lockups and Hangs"
	901	+
	902	+config PANIC_ON_OOPS
	903	+ bool "Panic on Oops"
	904	+ help
	905	+ Say Y here to enable the kernel to panic when it oopses. This
	906	+ has the same effect as setting oops=panic on the kernel command
	907	+ line.
	908	+
	909	+ This feature is useful to ensure that the kernel does not do
	910	+ anything erroneous after an oops which could result in data
	911	+ corruption or other issues.
	912	+
	913	+ Say N if unsure.
	914	+
	915	+config PANIC_ON_OOPS_VALUE
	916	+ int
	917	+ range 0 1
	918	+ default 0 if !PANIC_ON_OOPS
	919	+ default 1 if PANIC_ON_OOPS
	920	+
	921	+config PANIC_TIMEOUT
	922	+ int "panic timeout"
	923	+ default 0
	924	+ help
	925	+ Set the timeout value (in seconds) until a reboot occurs when
	926	+ the kernel panics. If n = 0, then we wait forever. A timeout
	927	+ value n > 0 will wait n seconds before rebooting, while a timeout
	928	+ value n < 0 will reboot immediately.
805	929
806	930	config LOCKUP_DETECTOR
807	931	bool
..	..	@@ -860,6 +984,7 @@
860	984	#
861	985	config HAVE_HARDLOCKUP_DETECTOR_OTHER_CPU
862	986	def_bool y
	987	+ depends on NO_GKI
863	988	depends on SMP
864	989	depends on !HAVE_HARDLOCKUP_DETECTOR_PERF && !HAVE_HARDLOCKUP_DETECTOR_ARCH
865	990
..	..	@@ -966,35 +1091,22 @@
966	1091	state. This can be configured through kernel parameter
967	1092	"workqueue.watchdog_thresh" and its sysfs counterpart.
968	1093
	1094	+config TEST_LOCKUP
	1095	+ tristate "Test module to generate lockups"
	1096	+ depends on m
	1097	+ help
	1098	+ This builds the "test_lockup" module that helps to make sure
	1099	+ that watchdogs and lockup detectors are working properly.
	1100	+
	1101	+ Depending on module parameters it could emulate soft or hard
	1102	+ lockup, "hung task", or locking arbitrary lock for a long time.
	1103	+ Also it could generate series of lockups with cooling-down periods.
	1104	+
	1105	+ If unsure, say N.
	1106	+
969	1107	endmenu # "Debug lockups and hangs"
970	1108
971		-config PANIC_ON_OOPS
972		- bool "Panic on Oops"
973		- help
974		- Say Y here to enable the kernel to panic when it oopses. This
975		- has the same effect as setting oops=panic on the kernel command
976		- line.
977		-
978		- This feature is useful to ensure that the kernel does not do
979		- anything erroneous after an oops which could result in data
980		- corruption or other issues.
981		-
982		- Say N if unsure.
983		-
984		-config PANIC_ON_OOPS_VALUE
985		- int
986		- range 0 1
987		- default 0 if !PANIC_ON_OOPS
988		- default 1 if PANIC_ON_OOPS
989		-
990		-config PANIC_TIMEOUT
991		- int "panic timeout"
992		- default 0
993		- help
994		- Set the timeout value (in seconds) until a reboot occurs when the
995		- the kernel panics. If n = 0, then we wait forever. A timeout
996		- value n > 0 will wait n seconds before rebooting, while a timeout
997		- value n < 0 will reboot immediately.
	1109	+menu "Scheduler Debugging"
998	1110
999	1111	config SCHED_DEBUG
1000	1112	bool "Collect scheduler debugging info"
..	..	@@ -1022,17 +1134,7 @@
1022	1134	application, you can say N to avoid the very slight overhead
1023	1135	this adds.
1024	1136
1025		-config SCHED_STACK_END_CHECK
1026		- bool "Detect stack corruption on calls to schedule()"
1027		- depends on DEBUG_KERNEL
1028		- default n
1029		- help
1030		- This option checks for a stack overrun on calls to schedule().
1031		- If the stack end location is found to be over written always panic as
1032		- the content of the corrupted region can no longer be trusted.
1033		- This is to ensure no erroneous behaviour occurs which could result in
1034		- data corruption or a sporadic crash at a later stage once the region
1035		- is examined. The runtime overhead introduced is minimal.
	1137	+endmenu
1036	1138
1037	1139	config DEBUG_TIMEKEEPING
1038	1140	bool "Enable extra timekeeping sanity checking"
..	..	@@ -1049,7 +1151,7 @@
1049	1151
1050	1152	config DEBUG_PREEMPT
1051	1153	bool "Debug preemptible kernel"
1052		- depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
	1154	+ depends on DEBUG_KERNEL && PREEMPTION && TRACE_IRQFLAGS_SUPPORT
1053	1155	default y
1054	1156	help
1055	1157	If you say Y here then the kernel will use a debug variant of the
..	..	@@ -1071,9 +1173,10 @@
1071	1173	select DEBUG_SPINLOCK
1072	1174	select DEBUG_MUTEXES
1073	1175	select DEBUG_RT_MUTEXES if RT_MUTEXES
1074		- select DEBUG_RWSEMS if RWSEM_SPIN_ON_OWNER
	1176	+ select DEBUG_RWSEMS
1075	1177	select DEBUG_WW_MUTEX_SLOWPATH
1076	1178	select DEBUG_LOCK_ALLOC
	1179	+ select PREEMPT_COUNT if !ARCH_NO_PREEMPT
1077	1180	select TRACE_IRQFLAGS
1078	1181	default n
1079	1182	help
..	..	@@ -1108,7 +1211,24 @@
1108	1211	the proof of observed correctness is also maintained for an
1109	1212	arbitrary combination of these separate locking variants.
1110	1213
1111		- For more details, see Documentation/locking/lockdep-design.txt.
	1214	+ For more details, see Documentation/locking/lockdep-design.rst.
	1215	+
	1216	+config PROVE_RAW_LOCK_NESTING
	1217	+ bool "Enable raw_spinlock - spinlock nesting checks"
	1218	+ depends on PROVE_LOCKING
	1219	+ default n
	1220	+ help
	1221	+ Enable the raw_spinlock vs. spinlock nesting checks which ensure
	1222	+ that the lock nesting rules for PREEMPT_RT enabled kernels are
	1223	+ not violated.
	1224	+
	1225	+ NOTE: There are known nesting problems. So if you enable this
	1226	+ option expect lockdep splats until these problems have been fully
	1227	+ addressed which is work in progress. This config switch allows to
	1228	+ identify and analyze these problems. It will be removed and the
	1229	+ check permanentely enabled once the main issues have been fixed.
	1230	+
	1231	+ If unsure, select N.
1112	1232
1113	1233	config LOCK_STAT
1114	1234	bool "Lock usage statistics"
..	..	@@ -1122,7 +1242,7 @@
1122	1242	help
1123	1243	This feature enables tracking lock contention points
1124	1244
1125		- For more details, see Documentation/locking/lockstat.txt
	1245	+ For more details, see Documentation/locking/lockstat.rst
1126	1246
1127	1247	This also enables lock events required by "perf lock",
1128	1248	subcommand of perf.
..	..	@@ -1175,10 +1295,10 @@
1175	1295
1176	1296	config DEBUG_RWSEMS
1177	1297	bool "RW Semaphore debugging: basic checks"
1178		- depends on DEBUG_KERNEL && RWSEM_SPIN_ON_OWNER
	1298	+ depends on DEBUG_KERNEL
1179	1299	help
1180		- This debugging feature allows mismatched rw semaphore locks and unlocks
1181		- to be detected and reported.
	1300	+ This debugging feature allows mismatched rw semaphore locks
	1301	+ and unlocks to be detected and reported.
1182	1302
1183	1303	config DEBUG_LOCK_ALLOC
1184	1304	bool "Lock debugging: detect incorrect freeing of live locks"
..	..	@@ -1199,12 +1319,51 @@
1199	1319	bool
1200	1320	depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
1201	1321	select STACKTRACE
1202		- select FRAME_POINTER if !MIPS && !PPC && !ARM_UNWIND && !S390 && !MICROBLAZE && !ARC && !X86
1203	1322	select KALLSYMS
1204	1323	select KALLSYMS_ALL
1205	1324
1206	1325	config LOCKDEP_SMALL
1207	1326	bool
	1327	+
	1328	+config LOCKDEP_BITS
	1329	+ int "Bitsize for MAX_LOCKDEP_ENTRIES"
	1330	+ depends on LOCKDEP && !LOCKDEP_SMALL
	1331	+ range 10 30
	1332	+ default 15
	1333	+ help
	1334	+ Try increasing this value if you hit "BUG: MAX_LOCKDEP_ENTRIES too low!" message.
	1335	+
	1336	+config LOCKDEP_CHAINS_BITS
	1337	+ int "Bitsize for MAX_LOCKDEP_CHAINS"
	1338	+ depends on LOCKDEP && !LOCKDEP_SMALL
	1339	+ range 10 30
	1340	+ default 16
	1341	+ help
	1342	+ Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
	1343	+
	1344	+config LOCKDEP_STACK_TRACE_BITS
	1345	+ int "Bitsize for MAX_STACK_TRACE_ENTRIES"
	1346	+ depends on LOCKDEP && !LOCKDEP_SMALL
	1347	+ range 10 30
	1348	+ default 19
	1349	+ help
	1350	+ Try increasing this value if you hit "BUG: MAX_STACK_TRACE_ENTRIES too low!" message.
	1351	+
	1352	+config LOCKDEP_STACK_TRACE_HASH_BITS
	1353	+ int "Bitsize for STACK_TRACE_HASH_SIZE"
	1354	+ depends on LOCKDEP && !LOCKDEP_SMALL
	1355	+ range 10 30
	1356	+ default 14
	1357	+ help
	1358	+ Try increasing this value if you need large MAX_STACK_TRACE_ENTRIES.
	1359	+
	1360	+config LOCKDEP_CIRCULAR_QUEUE_BITS
	1361	+ int "Bitsize for elements in circular_queue struct"
	1362	+ depends on LOCKDEP
	1363	+ range 10 30
	1364	+ default 12
	1365	+ help
	1366	+ Try increasing this value if you hit "lockdep bfs error:-1" warning due to __cq_enqueue() failure.
1208	1367
1209	1368	config DEBUG_LOCKDEP
1210	1369	bool "Lock dependency engine debugging"
..	..	@@ -1227,7 +1386,7 @@
1227	1386
1228	1387	config DEBUG_LOCKING_API_SELFTESTS
1229	1388	bool "Locking API boot-time self-tests"
1230		- depends on DEBUG_KERNEL && !PREEMPT_RT_FULL
	1389	+ depends on DEBUG_KERNEL
1231	1390	help
1232	1391	Say Y here if you want the kernel to run a short self-test during
1233	1392	bootup. The self-test checks whether common types of locking bugs
..	..	@@ -1262,13 +1421,40 @@
1262	1421	Say M if you want these self tests to build as a module.
1263	1422	Say N if you are unsure.
1264	1423
	1424	+config SCF_TORTURE_TEST
	1425	+ tristate "torture tests for smp_call_function*()"
	1426	+ depends on DEBUG_KERNEL
	1427	+ select TORTURE_TEST
	1428	+ help
	1429	+ This option provides a kernel module that runs torture tests
	1430	+ on the smp_call_function() family of primitives. The kernel
	1431	+ module may be built after the fact on the running kernel to
	1432	+ be tested, if desired.
	1433	+
	1434	+config CSD_LOCK_WAIT_DEBUG
	1435	+ bool "Debugging for csd_lock_wait(), called from smp_call_function*()"
	1436	+ depends on DEBUG_KERNEL
	1437	+ depends on 64BIT
	1438	+ default n
	1439	+ help
	1440	+ This option enables debug prints when CPUs are slow to respond
	1441	+ to the smp_call_function*() IPI wrappers. These debug prints
	1442	+ include the IPI handler function currently executing (if any)
	1443	+ and relevant stack traces.
	1444	+
1265	1445	endmenu # lock debugging
1266	1446
1267	1447	config TRACE_IRQFLAGS
	1448	+ depends on TRACE_IRQFLAGS_SUPPORT
1268	1449	bool
1269	1450	help
1270	1451	Enables hooks to interrupt enabling and disabling for
1271	1452	either tracing or lock debugging.
	1453	+
	1454	+config TRACE_IRQFLAGS_NMI
	1455	+ def_bool y
	1456	+ depends on TRACE_IRQFLAGS
	1457	+ depends on TRACE_IRQFLAGS_NMI_SUPPORT
1272	1458
1273	1459	config STACKTRACE
1274	1460	bool "Stack backtrace support"
..	..	@@ -1298,8 +1484,7 @@
1298	1484	so architecture maintainers really need to do what they can
1299	1485	to get the CRNG seeded sooner after the system is booted.
1300	1486	However, since users cannot do anything actionable to
1301		- address this, by default the kernel will issue only a single
1302		- warning for the first use of unseeded randomness.
	1487	+ address this, by default this option is disabled.
1303	1488
1304	1489	Say Y here if you want to receive warnings for all uses of
1305	1490	unseeded randomness. This will be of use primarily for
..	..	@@ -1312,7 +1497,7 @@
1312	1497	depends on DEBUG_KERNEL
1313	1498	help
1314	1499	If you say Y here, some extra kobject debugging messages will be sent
1315		- to the syslog.
	1500	+ to the syslog.
1316	1501
1317	1502	config DEBUG_KOBJECT_RELEASE
1318	1503	bool "kobject release debugging"
..	..	@@ -1336,14 +1521,7 @@
1336	1521	config HAVE_DEBUG_BUGVERBOSE
1337	1522	bool
1338	1523
1339		-config DEBUG_BUGVERBOSE
1340		- bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
1341		- depends on BUG && (GENERIC_BUG \|\| HAVE_DEBUG_BUGVERBOSE)
1342		- default y
1343		- help
1344		- Say Y here to make BUG() panics output the file name and line number
1345		- of the BUG call as well as the EIP and oops trace. This aids
1346		- debugging but costs about 70-100K of memory.
	1524	+menu "Debug kernel data structures"
1347	1525
1348	1526	config DEBUG_LIST
1349	1527	bool "Debug linked list manipulation"
..	..	@@ -1354,7 +1532,7 @@
1354	1532
1355	1533	If unsure, say N.
1356	1534
1357		-config DEBUG_PI_LIST
	1535	+config DEBUG_PLIST
1358	1536	bool "Debug priority linked list manipulation"
1359	1537	depends on DEBUG_KERNEL
1360	1538	help
..	..	@@ -1383,6 +1561,18 @@
1383	1561	modules properly unregister themselves from notifier chains.
1384	1562	This is a relatively cheap check but if you care about maximum
1385	1563	performance, say N.
	1564	+
	1565	+config BUG_ON_DATA_CORRUPTION
	1566	+ bool "Trigger a BUG when data corruption is detected"
	1567	+ select DEBUG_LIST
	1568	+ help
	1569	+ Select this option if the kernel should BUG when it encounters
	1570	+ data corruption in kernel memory structures when they get checked
	1571	+ for validity.
	1572	+
	1573	+ If unsure, say N.
	1574	+
	1575	+endmenu
1386	1576
1387	1577	config DEBUG_CREDENTIALS
1388	1578	bool "Debug credential management"
..	..	@@ -1417,7 +1607,7 @@
1417	1607	be impacted.
1418	1608
1419	1609	config DEBUG_BLOCK_EXT_DEVT
1420		- bool "Force extended block device numbers and spread them"
	1610	+ bool "Force extended block device numbers and spread them"
1421	1611	depends on DEBUG_KERNEL
1422	1612	depends on BLOCK
1423	1613	default n
..	..	@@ -1455,6 +1645,103 @@
1455	1645	restarted at arbitrary points yet.
1456	1646
1457	1647	Say N if your are unsure.
	1648	+
	1649	+config LATENCYTOP
	1650	+ bool "Latency measuring infrastructure"
	1651	+ depends on DEBUG_KERNEL
	1652	+ depends on STACKTRACE_SUPPORT
	1653	+ depends on PROC_FS
	1654	+ depends on FRAME_POINTER \|\| MIPS \|\| PPC \|\| S390 \|\| MICROBLAZE \|\| ARM \|\| ARC \|\| X86
	1655	+ select KALLSYMS
	1656	+ select KALLSYMS_ALL
	1657	+ select STACKTRACE
	1658	+ select SCHEDSTATS
	1659	+ select SCHED_DEBUG
	1660	+ help
	1661	+ Enable this option if you want to use the LatencyTOP tool
	1662	+ to find out which userspace is blocking on what kernel operations.
	1663	+
	1664	+source "kernel/trace/Kconfig"
	1665	+
	1666	+config PROVIDE_OHCI1394_DMA_INIT
	1667	+ bool "Remote debugging over FireWire early on boot"
	1668	+ depends on PCI && X86
	1669	+ help
	1670	+ If you want to debug problems which hang or crash the kernel early
	1671	+ on boot and the crashing machine has a FireWire port, you can use
	1672	+ this feature to remotely access the memory of the crashed machine
	1673	+ over FireWire. This employs remote DMA as part of the OHCI1394
	1674	+ specification which is now the standard for FireWire controllers.
	1675	+
	1676	+ With remote DMA, you can monitor the printk buffer remotely using
	1677	+ firescope and access all memory below 4GB using fireproxy from gdb.
	1678	+ Even controlling a kernel debugger is possible using remote DMA.
	1679	+
	1680	+ Usage:
	1681	+
	1682	+ If ohci1394_dma=early is used as boot parameter, it will initialize
	1683	+ all OHCI1394 controllers which are found in the PCI config space.
	1684	+
	1685	+ As all changes to the FireWire bus such as enabling and disabling
	1686	+ devices cause a bus reset and thereby disable remote DMA for all
	1687	+ devices, be sure to have the cable plugged and FireWire enabled on
	1688	+ the debugging host before booting the debug target for debugging.
	1689	+
	1690	+ This code (~1k) is freed after boot. By then, the firewire stack
	1691	+ in charge of the OHCI-1394 controllers should be used instead.
	1692	+
	1693	+ See Documentation/core-api/debugging-via-ohci1394.rst for more information.
	1694	+
	1695	+source "samples/Kconfig"
	1696	+
	1697	+config ARCH_HAS_DEVMEM_IS_ALLOWED
	1698	+ bool
	1699	+
	1700	+config STRICT_DEVMEM
	1701	+ bool "Filter access to /dev/mem"
	1702	+ depends on MMU && DEVMEM
	1703	+ depends on ARCH_HAS_DEVMEM_IS_ALLOWED
	1704	+ default y if PPC \|\| X86 \|\| ARM64
	1705	+ help
	1706	+ If this option is disabled, you allow userspace (root) access to all
	1707	+ of memory, including kernel and userspace memory. Accidental
	1708	+ access to this is obviously disastrous, but specific access can
	1709	+ be used by people debugging the kernel. Note that with PAT support
	1710	+ enabled, even in this case there are restrictions on /dev/mem
	1711	+ use due to the cache aliasing requirements.
	1712	+
	1713	+ If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
	1714	+ file only allows userspace access to PCI space and the BIOS code and
	1715	+ data regions. This is sufficient for dosemu and X and all common
	1716	+ users of /dev/mem.
	1717	+
	1718	+ If in doubt, say Y.
	1719	+
	1720	+config IO_STRICT_DEVMEM
	1721	+ bool "Filter I/O access to /dev/mem"
	1722	+ depends on STRICT_DEVMEM
	1723	+ help
	1724	+ If this option is disabled, you allow userspace (root) access to all
	1725	+ io-memory regardless of whether a driver is actively using that
	1726	+ range. Accidental access to this is obviously disastrous, but
	1727	+ specific access can be used by people debugging kernel drivers.
	1728	+
	1729	+ If this option is switched on, the /dev/mem file only allows
	1730	+ userspace access to idle io-memory ranges (see /proc/iomem) This
	1731	+ may break traditional users of /dev/mem (dosemu, legacy X, etc...)
	1732	+ if the driver using a given range cannot be disabled.
	1733	+
	1734	+ If in doubt, say Y.
	1735	+
	1736	+menu "$(SRCARCH) Debugging"
	1737	+
	1738	+source "arch/$(SRCARCH)/Kconfig.debug"
	1739	+
	1740	+endmenu
	1741	+
	1742	+menu "Kernel Testing and Coverage"
	1743	+
	1744	+source "lib/kunit/Kconfig"
1458	1745
1459	1746	config NOTIFIER_ERROR_INJECTION
1460	1747	tristate "Notifier error injection"
..	..	@@ -1532,8 +1819,14 @@
1532	1819	If unsure, say N.
1533	1820
1534	1821	config FUNCTION_ERROR_INJECTION
1535		- def_bool y
	1822	+ bool "Fault-injections of functions"
1536	1823	depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
	1824	+ help
	1825	+ Add fault injections into various functions that are annotated with
	1826	+ ALLOW_ERROR_INJECTION() in the kernel. BPF may also modify the return
	1827	+ value of theses functions. This is useful to test error paths of code.
	1828	+
	1829	+ If unsure, say N
1537	1830
1538	1831	config FAULT_INJECTION
1539	1832	bool "Fault-injection framework"
..	..	@@ -1550,10 +1843,17 @@
1550	1843	Provide fault-injection capability for kmalloc.
1551	1844
1552	1845	config FAIL_PAGE_ALLOC
1553		- bool "Fault-injection capabilitiy for alloc_pages()"
	1846	+ bool "Fault-injection capability for alloc_pages()"
1554	1847	depends on FAULT_INJECTION
1555	1848	help
1556	1849	Provide fault-injection capability for alloc_pages().
	1850	+
	1851	+config FAULT_INJECTION_USERCOPY
	1852	+ bool "Fault injection capability for usercopy functions"
	1853	+ depends on FAULT_INJECTION
	1854	+ help
	1855	+ Provides fault-injection capability to inject failures
	1856	+ in usercopy functions (copy_from_user(), get_user(), ...).
1557	1857
1558	1858	config FAIL_MAKE_REQUEST
1559	1859	bool "Fault-injection capability for disk IO"
..	..	@@ -1610,91 +1910,66 @@
1610	1910	depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
1611	1911	depends on !X86_64
1612	1912	select STACKTRACE
1613		- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86
	1913	+ depends on FRAME_POINTER \|\| MIPS \|\| PPC \|\| S390 \|\| MICROBLAZE \|\| ARM \|\| ARC \|\| X86
1614	1914	help
1615	1915	Provide stacktrace filter for fault-injection capabilities
1616	1916
1617		-config LATENCYTOP
1618		- bool "Latency measuring infrastructure"
1619		- depends on DEBUG_KERNEL
1620		- depends on STACKTRACE_SUPPORT
1621		- depends on PROC_FS
1622		- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM_UNWIND && !ARC && !X86
1623		- select KALLSYMS
1624		- select KALLSYMS_ALL
1625		- select STACKTRACE
1626		- select SCHEDSTATS
1627		- select SCHED_DEBUG
	1917	+config ARCH_HAS_KCOV
	1918	+ bool
1628	1919	help
1629		- Enable this option if you want to use the LatencyTOP tool
1630		- to find out which userspace is blocking on what kernel operations.
	1920	+ An architecture should select this when it can successfully
	1921	+ build and run with CONFIG_KCOV. This typically requires
	1922	+ disabling instrumentation for some early boot code.
1631	1923
1632		-source kernel/trace/Kconfig
	1924	+config CC_HAS_SANCOV_TRACE_PC
	1925	+ def_bool $(cc-option,-fsanitize-coverage=trace-pc)
1633	1926
1634		-config PROVIDE_OHCI1394_DMA_INIT
1635		- bool "Remote debugging over FireWire early on boot"
1636		- depends on PCI && X86
	1927	+
	1928	+config KCOV
	1929	+ bool "Code coverage for fuzzing"
	1930	+ depends on ARCH_HAS_KCOV
	1931	+ depends on CC_HAS_SANCOV_TRACE_PC \|\| GCC_PLUGINS
	1932	+ select DEBUG_FS
	1933	+ select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
1637	1934	help
1638		- If you want to debug problems which hang or crash the kernel early
1639		- on boot and the crashing machine has a FireWire port, you can use
1640		- this feature to remotely access the memory of the crashed machine
1641		- over FireWire. This employs remote DMA as part of the OHCI1394
1642		- specification which is now the standard for FireWire controllers.
	1935	+ KCOV exposes kernel code coverage information in a form suitable
	1936	+ for coverage-guided fuzzing (randomized testing).
1643	1937
1644		- With remote DMA, you can monitor the printk buffer remotely using
1645		- firescope and access all memory below 4GB using fireproxy from gdb.
1646		- Even controlling a kernel debugger is possible using remote DMA.
	1938	+ If RANDOMIZE_BASE is enabled, PC values will not be stable across
	1939	+ different machines and across reboots. If you need stable PC values,
	1940	+ disable RANDOMIZE_BASE.
1647	1941
1648		- Usage:
	1942	+ For more details, see Documentation/dev-tools/kcov.rst.
1649	1943
1650		- If ohci1394_dma=early is used as boot parameter, it will initialize
1651		- all OHCI1394 controllers which are found in the PCI config space.
1652		-
1653		- As all changes to the FireWire bus such as enabling and disabling
1654		- devices cause a bus reset and thereby disable remote DMA for all
1655		- devices, be sure to have the cable plugged and FireWire enabled on
1656		- the debugging host before booting the debug target for debugging.
1657		-
1658		- This code (~1k) is freed after boot. By then, the firewire stack
1659		- in charge of the OHCI-1394 controllers should be used instead.
1660		-
1661		- See Documentation/debugging-via-ohci1394.txt for more information.
1662		-
1663		-config DMA_API_DEBUG
1664		- bool "Enable debugging of DMA-API usage"
1665		- select NEED_DMA_MAP_STATE
	1944	+config KCOV_ENABLE_COMPARISONS
	1945	+ bool "Enable comparison operands collection by KCOV"
	1946	+ depends on KCOV
	1947	+ depends on $(cc-option,-fsanitize-coverage=trace-cmp)
1666	1948	help
1667		- Enable this option to debug the use of the DMA API by device drivers.
1668		- With this option you will be able to detect common bugs in device
1669		- drivers like double-freeing of DMA mappings or freeing mappings that
1670		- were never allocated.
	1949	+ KCOV also exposes operands of every comparison in the instrumented
	1950	+ code along with operand sizes and PCs of the comparison instructions.
	1951	+ These operands can be used by fuzzing engines to improve the quality
	1952	+ of fuzzing coverage.
1671	1953
1672		- This also attempts to catch cases where a page owned by DMA is
1673		- accessed by the cpu in a way that could cause data corruption. For
1674		- example, this enables cow_user_page() to check that the source page is
1675		- not undergoing DMA.
1676		-
1677		- This option causes a performance degradation. Use only if you want to
1678		- debug device drivers and dma interactions.
1679		-
1680		- If unsure, say N.
1681		-
1682		-config DMA_API_DEBUG_SG
1683		- bool "Debug DMA scatter-gather usage"
	1954	+config KCOV_INSTRUMENT_ALL
	1955	+ bool "Instrument all code by default"
	1956	+ depends on KCOV
1684	1957	default y
1685		- depends on DMA_API_DEBUG
1686	1958	help
1687		- Perform extra checking that callers of dma_map_sg() have respected the
1688		- appropriate segment length/boundary limits for the given device when
1689		- preparing DMA scatterlists.
	1959	+ If you are doing generic system call fuzzing (like e.g. syzkaller),
	1960	+ then you will want to instrument the whole kernel and you should
	1961	+ say y here. If you are doing more targeted fuzzing (like e.g.
	1962	+ filesystem fuzzing with AFL) then you will want to enable coverage
	1963	+ for more specific subsets of files, and should say n here.
1690	1964
1691		- This is particularly likely to have been overlooked in cases where the
1692		- dma_map_sg() API is used for general bulk mapping of pages rather than
1693		- preparing literal scatter-gather descriptors, where there is a risk of
1694		- unexpected behaviour from DMA API implementations if the scatterlist
1695		- is technically out-of-spec.
1696		-
1697		- If unsure, say N.
	1965	+config KCOV_IRQ_AREA_SIZE
	1966	+ hex "Size of interrupt coverage collection area in words"
	1967	+ depends on KCOV
	1968	+ default 0x40000
	1969	+ help
	1970	+ KCOV uses preallocated per-cpu areas to collect coverage from
	1971	+ soft interrupts. This specifies the size of those areas in the
	1972	+ number of unsigned long words.
1698	1973
1699	1974	menuconfig RUNTIME_TESTING_MENU
1700	1975	bool "Runtime Testing"
..	..	@@ -1705,7 +1980,6 @@
1705	1980	config LKDTM
1706	1981	tristate "Linux Kernel Dump Test Tool Module"
1707	1982	depends on DEBUG_FS
1708		- depends on BLOCK
1709	1983	help
1710	1984	This module enables testing of the different dumping mechanisms by
1711	1985	inducing system failures at predefined crash points.
..	..	@@ -1714,13 +1988,23 @@
1714	1988	called lkdtm.
1715	1989
1716	1990	Documentation on how to use the module can be found in
1717		- Documentation/fault-injection/provoke-crashes.txt
	1991	+ Documentation/fault-injection/provoke-crashes.rst
1718	1992
1719	1993	config TEST_LIST_SORT
1720	1994	tristate "Linked list sorting test"
1721	1995	depends on DEBUG_KERNEL \|\| m
1722	1996	help
1723	1997	Enable this to turn on 'list_sort()' function test. This test is
	1998	+ executed only once during system boot (so affects only boot time),
	1999	+ or at module load time.
	2000	+
	2001	+ If unsure, say N.
	2002	+
	2003	+config TEST_MIN_HEAP
	2004	+ tristate "Min heap test"
	2005	+ depends on DEBUG_KERNEL \|\| m
	2006	+ help
	2007	+ Enable this to turn on min heap function tests. This test is
1724	2008	executed only once during system boot (so affects only boot time),
1725	2009	or at module load time.
1726	2010
..	..	@@ -1767,6 +2051,18 @@
1767	2051	A benchmark measuring the performance of the rbtree library.
1768	2052	Also includes rbtree invariant checks.
1769	2053
	2054	+config REED_SOLOMON_TEST
	2055	+ tristate "Reed-Solomon library test"
	2056	+ depends on DEBUG_KERNEL \|\| m
	2057	+ select REED_SOLOMON
	2058	+ select REED_SOLOMON_ENC16
	2059	+ select REED_SOLOMON_DEC16
	2060	+ help
	2061	+ This option enables the self-test function of rslib at boot,
	2062	+ or at module load time.
	2063	+
	2064	+ If unsure, say N.
	2065	+
1770	2066	config INTERVAL_TREE_TEST
1771	2067	tristate "Interval tree test"
1772	2068	depends on DEBUG_KERNEL
..	..	@@ -1795,7 +2091,7 @@
1795	2091	tristate "Self test for hardware accelerated raid6 recovery"
1796	2092	depends on ASYNC_RAID6_RECOV
1797	2093	select ASYNC_MEMCPY
1798		- ---help---
	2094	+ help
1799	2095	This is a one-shot self test that permutes through the
1800	2096	recovery of all the possible two disk failure scenarios for a
1801	2097	N-disk array. Recovery is performed with the asynchronous
..	..	@@ -1810,6 +2106,9 @@
1810	2106	config TEST_STRING_HELPERS
1811	2107	tristate "Test functions located in the string_helpers module at runtime"
1812	2108
	2109	+config TEST_STRSCPY
	2110	+ tristate "Test strscpy*() family of functions at runtime"
	2111	+
1813	2112	config TEST_KSTRTOX
1814	2113	tristate "Test kstrto*() family of functions at runtime"
1815	2114
..	..	@@ -1823,15 +2122,11 @@
1823	2122
1824	2123	If unsure, say N.
1825	2124
1826		-config TEST_BITFIELD
1827		- tristate "Test bitfield functions at runtime"
1828		- help
1829		- Enable this option to test the bitfield functions at boot.
1830		-
1831		- If unsure, say N.
1832		-
1833	2125	config TEST_UUID
1834	2126	tristate "Test functions located in the uuid module at runtime"
	2127	+
	2128	+config TEST_XARRAY
	2129	+ tristate "Test the XArray code at runtime"
1835	2130
1836	2131	config TEST_OVERFLOW
1837	2132	tristate "Test check_*_overflow() functions at runtime"
..	..	@@ -1865,6 +2160,14 @@
1865	2160
1866	2161	If unsure, say N.
1867	2162
	2163	+config TEST_IRQ_TIMINGS
	2164	+ bool "IRQ timings selftest"
	2165	+ depends on IRQ_TIMINGS
	2166	+ help
	2167	+ Enable this option to test the irq timings code on boot.
	2168	+
	2169	+ If unsure, say N.
	2170	+
1868	2171	config TEST_LKM
1869	2172	tristate "Test module loading with 'hello world' module"
1870	2173	depends on m
..	..	@@ -1875,6 +2178,32 @@
1875	2178	validating module verification). It lacks any extra dependencies,
1876	2179	and will not normally be loaded by the system unless explicitly
1877	2180	requested by name.
	2181	+
	2182	+ If unsure, say N.
	2183	+
	2184	+config TEST_BITOPS
	2185	+ tristate "Test module for compilation of bitops operations"
	2186	+ depends on m
	2187	+ help
	2188	+ This builds the "test_bitops" module that is much like the
	2189	+ TEST_LKM module except that it does a basic exercise of the
	2190	+ set/clear_bit macros and get_count_order/long to make sure there are
	2191	+ no compiler warnings from C=1 sparse checker or -Wextra
	2192	+ compilations. It has no dependencies and doesn't run or load unless
	2193	+ explicitly requested by name. for example: modprobe test_bitops.
	2194	+
	2195	+ If unsure, say N.
	2196	+
	2197	+config TEST_VMALLOC
	2198	+ tristate "Test module for stress/performance analysis of vmalloc allocator"
	2199	+ default n
	2200	+ depends on MMU
	2201	+ depends on m
	2202	+ help
	2203	+ This builds the "test_vmalloc" module that should be used for
	2204	+ stress and performance analysis. So, any new change for vmalloc
	2205	+ subsystem can be evaluated from performance and stability point
	2206	+ of view.
1878	2207
1879	2208	If unsure, say N.
1880	2209
..	..	@@ -1900,6 +2229,15 @@
1900	2229	development, but also to run regression tests against changes in
1901	2230	the interpreter code. It also enables test stubs for eBPF maps and
1902	2231	verifier used by user space verifier testsuite.
	2232	+
	2233	+ If unsure, say N.
	2234	+
	2235	+config TEST_BLACKHOLE_DEV
	2236	+ tristate "Test blackhole netdev functionality"
	2237	+ depends on m && NET
	2238	+ help
	2239	+ This builds the "test_blackhole_dev" module that validates the
	2240	+ data path through this blackhole netdev.
1903	2241
1904	2242	If unsure, say N.
1905	2243
..	..	@@ -1933,6 +2271,76 @@
1933	2271
1934	2272	If unsure, say N.
1935	2273
	2274	+config BITFIELD_KUNIT
	2275	+ tristate "KUnit test bitfield functions at runtime"
	2276	+ depends on KUNIT
	2277	+ help
	2278	+ Enable this option to test the bitfield functions at boot.
	2279	+
	2280	+ KUnit tests run during boot and output the results to the debug log
	2281	+ in TAP format (http://testanything.org/). Only useful for kernel devs
	2282	+ running the KUnit test harness, and not intended for inclusion into a
	2283	+ production build.
	2284	+
	2285	+ For more information on KUnit and unit tests in general please refer
	2286	+ to the KUnit documentation in Documentation/dev-tools/kunit/.
	2287	+
	2288	+ If unsure, say N.
	2289	+
	2290	+config SYSCTL_KUNIT_TEST
	2291	+ tristate "KUnit test for sysctl" if !KUNIT_ALL_TESTS
	2292	+ depends on KUNIT
	2293	+ default KUNIT_ALL_TESTS
	2294	+ help
	2295	+ This builds the proc sysctl unit test, which runs on boot.
	2296	+ Tests the API contract and implementation correctness of sysctl.
	2297	+ For more information on KUnit and unit tests in general please refer
	2298	+ to the KUnit documentation in Documentation/dev-tools/kunit/.
	2299	+
	2300	+ If unsure, say N.
	2301	+
	2302	+config LIST_KUNIT_TEST
	2303	+ tristate "KUnit Test for Kernel Linked-list structures" if !KUNIT_ALL_TESTS
	2304	+ depends on KUNIT
	2305	+ default KUNIT_ALL_TESTS
	2306	+ help
	2307	+ This builds the linked list KUnit test suite.
	2308	+ It tests that the API and basic functionality of the list_head type
	2309	+ and associated macros.
	2310	+
	2311	+ KUnit tests run during boot and output the results to the debug log
	2312	+ in TAP format (https://testanything.org/). Only useful for kernel devs
	2313	+ running the KUnit test harness, and not intended for inclusion into a
	2314	+ production build.
	2315	+
	2316	+ For more information on KUnit and unit tests in general please refer
	2317	+ to the KUnit documentation in Documentation/dev-tools/kunit/.
	2318	+
	2319	+ If unsure, say N.
	2320	+
	2321	+config LINEAR_RANGES_TEST
	2322	+ tristate "KUnit test for linear_ranges"
	2323	+ depends on KUNIT
	2324	+ select LINEAR_RANGES
	2325	+ help
	2326	+ This builds the linear_ranges unit test, which runs on boot.
	2327	+ Tests the linear_ranges logic correctness.
	2328	+ For more information on KUnit and unit tests in general please refer
	2329	+ to the KUnit documentation in Documentation/dev-tools/kunit/.
	2330	+
	2331	+ If unsure, say N.
	2332	+
	2333	+config BITS_TEST
	2334	+ tristate "KUnit test for bits.h"
	2335	+ depends on KUNIT
	2336	+ help
	2337	+ This builds the bits unit test.
	2338	+ Tests the logic of macros defined in bits.h.
	2339	+ For more information on KUnit and unit tests in general please refer
	2340	+ to the KUnit documentation in Documentation/dev-tools/kunit/.
	2341	+
	2342	+ If unsure, say N.
	2343	+
1936	2344	config TEST_UDELAY
1937	2345	tristate "udelay test driver"
1938	2346	help
..	..	@@ -1952,7 +2360,6 @@
1952	2360	config TEST_KMOD
1953	2361	tristate "kmod stress tester"
1954	2362	depends on m
1955		- depends on BLOCK && (64BIT \|\| LBDAF) # for XFS, BTRFS
1956	2363	depends on NETDEVICES && NET_CORE && INET # for TUN
1957	2364	depends on BLOCK
1958	2365	select TEST_LKM
..	..	@@ -1986,13 +2393,44 @@
1986	2393
1987	2394	If unsure, say N.
1988	2395
1989		-config TEST_MEMINIT
1990		- tristate "Test heap/page initialization"
	2396	+config TEST_MEMCAT_P
	2397	+ tristate "Test memcat_p() helper function"
1991	2398	help
1992		- Test if the kernel is zero-initializing heap and page allocations.
1993		- This can be useful to test init_on_alloc and init_on_free features.
	2399	+ Test the memcat_p() helper for correctly merging two
	2400	+ pointer arrays together.
1994	2401
1995	2402	If unsure, say N.
	2403	+
	2404	+config TEST_LIVEPATCH
	2405	+ tristate "Test livepatching"
	2406	+ default n
	2407	+ depends on DYNAMIC_DEBUG
	2408	+ depends on LIVEPATCH
	2409	+ depends on m
	2410	+ help
	2411	+ Test kernel livepatching features for correctness. The tests will
	2412	+ load test modules that will be livepatched in various scenarios.
	2413	+
	2414	+ To run all the livepatching tests:
	2415	+
	2416	+ make -C tools/testing/selftests TARGETS=livepatch run_tests
	2417	+
	2418	+ Alternatively, individual tests may be invoked:
	2419	+
	2420	+ tools/testing/selftests/livepatch/test-callbacks.sh
	2421	+ tools/testing/selftests/livepatch/test-livepatch.sh
	2422	+ tools/testing/selftests/livepatch/test-shadow-vars.sh
	2423	+
	2424	+ If unsure, say N.
	2425	+
	2426	+config TEST_OBJAGG
	2427	+ tristate "Perform selftest on object aggreration manager"
	2428	+ default n
	2429	+ depends on OBJAGG
	2430	+ help
	2431	+ Enable this option to test object aggregation manager on boot
	2432	+ (or module load).
	2433	+
1996	2434
1997	2435	config TEST_STACKINIT
1998	2436	tristate "Test level of stack variable initialization"
..	..	@@ -2004,12 +2442,52 @@
2004	2442
2005	2443	If unsure, say N.
2006	2444
	2445	+config TEST_MEMINIT
	2446	+ tristate "Test heap/page initialization"
	2447	+ help
	2448	+ Test if the kernel is zero-initializing heap and page allocations.
	2449	+ This can be useful to test init_on_alloc and init_on_free features.
	2450	+
	2451	+ If unsure, say N.
	2452	+
	2453	+config TEST_HMM
	2454	+ tristate "Test HMM (Heterogeneous Memory Management)"
	2455	+ depends on TRANSPARENT_HUGEPAGE
	2456	+ depends on DEVICE_PRIVATE
	2457	+ select HMM_MIRROR
	2458	+ select MMU_NOTIFIER
	2459	+ help
	2460	+ This is a pseudo device driver solely for testing HMM.
	2461	+ Say M here if you want to build the HMM test module.
	2462	+ Doing so will allow you to run tools/testing/selftest/vm/hmm-tests.
	2463	+
	2464	+ If unsure, say N.
	2465	+
	2466	+config TEST_FREE_PAGES
	2467	+ tristate "Test freeing pages"
	2468	+ help
	2469	+ Test that a memory leak does not occur due to a race between
	2470	+ freeing a block of pages and a speculative page reference.
	2471	+ Loading this module is safe if your kernel has the bug fixed.
	2472	+ If the bug is not fixed, it will leak gigabytes of memory and
	2473	+ probably OOM your system.
	2474	+
	2475	+config TEST_FPU
	2476	+ tristate "Test floating point operations in kernel space"
	2477	+ depends on X86 && !KCOV_INSTRUMENT_ALL
	2478	+ help
	2479	+ Enable this option to add /sys/kernel/debug/selftest_helpers/test_fpu
	2480	+ which will trigger a sequence of floating point operations. This is used
	2481	+ for self-testing floating point control register setting in
	2482	+ kernel_fpu_begin().
	2483	+
	2484	+ If unsure, say N.
	2485	+
2007	2486	endif # RUNTIME_TESTING_MENU
2008	2487
2009	2488	config MEMTEST
2010	2489	bool "Memtest"
2011		- depends on HAVE_MEMBLOCK
2012		- ---help---
	2490	+ help
2013	2491	This option adds a kernel parameter 'memtest', which allows memtest
2014	2492	to be set.
2015	2493	memtest=0, mean disabled; -- default
..	..	@@ -2018,61 +2496,17 @@
2018	2496	memtest=17, mean do 17 test patterns.
2019	2497	If you are unsure how to answer this question, answer N.
2020	2498
2021		-config BUG_ON_DATA_CORRUPTION
2022		- bool "Trigger a BUG when data corruption is detected"
2023		- select DEBUG_LIST
	2499	+
	2500	+
	2501	+config HYPERV_TESTING
	2502	+ bool "Microsoft Hyper-V driver testing"
	2503	+ default n
	2504	+ depends on HYPERV && DEBUG_FS
2024	2505	help
2025		- Select this option if the kernel should BUG when it encounters
2026		- data corruption in kernel memory structures when they get checked
2027		- for validity.
	2506	+ Select this option to enable Hyper-V vmbus testing.
2028	2507
2029		- If unsure, say N.
	2508	+endmenu # "Kernel Testing and Coverage"
2030	2509
2031		-source "samples/Kconfig"
2032		-
2033		-source "lib/Kconfig.kgdb"
2034		-
2035		-source "lib/Kconfig.ubsan"
2036		-
2037		-config ARCH_HAS_DEVMEM_IS_ALLOWED
2038		- bool
2039		-
2040		-config STRICT_DEVMEM
2041		- bool "Filter access to /dev/mem"
2042		- depends on MMU && DEVMEM
2043		- depends on ARCH_HAS_DEVMEM_IS_ALLOWED
2044		- default y if PPC \|\| X86 \|\| ARM64
2045		- ---help---
2046		- If this option is disabled, you allow userspace (root) access to all
2047		- of memory, including kernel and userspace memory. Accidental
2048		- access to this is obviously disastrous, but specific access can
2049		- be used by people debugging the kernel. Note that with PAT support
2050		- enabled, even in this case there are restrictions on /dev/mem
2051		- use due to the cache aliasing requirements.
2052		-
2053		- If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
2054		- file only allows userspace access to PCI space and the BIOS code and
2055		- data regions. This is sufficient for dosemu and X and all common
2056		- users of /dev/mem.
2057		-
2058		- If in doubt, say Y.
2059		-
2060		-config IO_STRICT_DEVMEM
2061		- bool "Filter I/O access to /dev/mem"
2062		- depends on STRICT_DEVMEM
2063		- ---help---
2064		- If this option is disabled, you allow userspace (root) access to all
2065		- io-memory regardless of whether a driver is actively using that
2066		- range. Accidental access to this is obviously disastrous, but
2067		- specific access can be used by people debugging kernel drivers.
2068		-
2069		- If this option is switched on, the /dev/mem file only allows
2070		- userspace access to idle io-memory ranges (see /proc/iomem) This
2071		- may break traditional users of /dev/mem (dosemu, legacy X, etc...)
2072		- if the driver using a given range cannot be disabled.
2073		-
2074		- If in doubt, say Y.
2075		-
2076		-source "arch/$(SRCARCH)/Kconfig.debug"
	2510	+source "Documentation/Kconfig"
2077	2511
2078	2512	endmenu # Kernel hacking