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-rw-r--r--lib/Kconfig.debug1049
1 files changed, 836 insertions, 213 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 69def4a9df00..c3c0b077ade3 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -35,6 +35,17 @@ config PRINTK_CALLER
no option to enable/disable at the kernel command line parameter or
sysfs interface.
+config STACKTRACE_BUILD_ID
+ bool "Show build ID information in stacktraces"
+ depends on PRINTK
+ help
+ Selecting this option adds build ID information for symbols in
+ stacktraces printed with the printk format '%p[SR]b'.
+
+ This option is intended for distros where debuginfo is not easily
+ accessible but can be downloaded given the build ID of the vmlinux or
+ kernel module where the function is located.
+
config CONSOLE_LOGLEVEL_DEFAULT
int "Default console loglevel (1-15)"
range 1 15
@@ -98,7 +109,8 @@ config DYNAMIC_DEBUG
bool "Enable dynamic printk() support"
default n
depends on PRINTK
- depends on DEBUG_FS
+ depends on (DEBUG_FS || PROC_FS)
+ select DYNAMIC_DEBUG_CORE
help
Compiles debug level messages into the kernel, which would not
@@ -116,8 +128,9 @@ config DYNAMIC_DEBUG
Usage:
Dynamic debugging is controlled via the 'dynamic_debug/control' file,
- which is contained in the 'debugfs' filesystem. Thus, the debugfs
- filesystem must first be mounted before making use of this feature.
+ which is contained in the 'debugfs' filesystem or procfs.
+ Thus, the debugfs or procfs filesystem must first be mounted before
+ making use of this feature.
We refer the control file as: <debugfs>/dynamic_debug/control. This
file contains a list of the debug statements that can be enabled. The
format for each line of the file is:
@@ -164,6 +177,17 @@ config DYNAMIC_DEBUG
See Documentation/admin-guide/dynamic-debug-howto.rst for additional
information.
+config DYNAMIC_DEBUG_CORE
+ bool "Enable core function of dynamic debug support"
+ depends on PRINTK
+ depends on (DEBUG_FS || PROC_FS)
+ help
+ Enable core functional support of dynamic debug. It is useful
+ when you want to tie dynamic debug to your kernel modules with
+ DYNAMIC_DEBUG_MODULE defined for each of them, especially for
+ the case of embedded system where the kernel image size is
+ sensitive for people.
+
config SYMBOLIC_ERRNAME
bool "Support symbolic error names in printf"
default y if PRINTK
@@ -184,24 +208,100 @@ config DEBUG_BUGVERBOSE
endmenu # "printk and dmesg options"
+config DEBUG_KERNEL
+ bool "Kernel debugging"
+ help
+ Say Y here if you are developing drivers or trying to debug and
+ identify kernel problems.
+
+config DEBUG_MISC
+ bool "Miscellaneous debug code"
+ default DEBUG_KERNEL
+ depends on DEBUG_KERNEL
+ help
+ Say Y here if you need to enable miscellaneous debug code that should
+ be under a more specific debug option but isn't.
+
menu "Compile-time checks and compiler options"
config DEBUG_INFO
- bool "Compile the kernel with debug info"
- depends on DEBUG_KERNEL && !COMPILE_TEST
+ bool
help
- If you say Y here the resulting kernel image will include
- debugging info resulting in a larger kernel image.
+ A kernel debug info option other than "None" has been selected
+ in the "Debug information" choice below, indicating that debug
+ information will be generated for build targets.
+
+# Clang is known to generate .{s,u}leb128 with symbol deltas with DWARF5, which
+# some targets may not support: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
+config AS_HAS_NON_CONST_LEB128
+ def_bool $(as-instr,.uleb128 .Lexpr_end4 - .Lexpr_start3\n.Lexpr_start3:\n.Lexpr_end4:)
+
+choice
+ prompt "Debug information"
+ depends on DEBUG_KERNEL
+ help
+ Selecting something other than "None" results in a kernel image
+ that will include debugging info resulting in a larger kernel image.
This adds debug symbols to the kernel and modules (gcc -g), and
is needed if you intend to use kernel crashdump or binary object
tools like crash, kgdb, LKCD, gdb, etc on the kernel.
- Say Y here only if you plan to debug the kernel.
- If unsure, say N.
+ Choose which version of DWARF debug info to emit. If unsure,
+ select "Toolchain default".
+
+config DEBUG_INFO_NONE
+ bool "Disable debug information"
+ help
+ Do not build the kernel with debugging information, which will
+ result in a faster and smaller build.
+
+config DEBUG_INFO_DWARF_TOOLCHAIN_DEFAULT
+ bool "Rely on the toolchain's implicit default DWARF version"
+ select DEBUG_INFO
+ depends on !CC_IS_CLANG || AS_IS_LLVM || CLANG_VERSION < 140000 || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
+ help
+ The implicit default version of DWARF debug info produced by a
+ toolchain changes over time.
+
+ This can break consumers of the debug info that haven't upgraded to
+ support newer revisions, and prevent testing newer versions, but
+ those should be less common scenarios.
+
+config DEBUG_INFO_DWARF4
+ bool "Generate DWARF Version 4 debuginfo"
+ select DEBUG_INFO
+ depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502)
+ help
+ Generate DWARF v4 debug info. This requires gcc 4.5+, binutils 2.35.2
+ if using clang without clang's integrated assembler, and gdb 7.0+.
+
+ If you have consumers of DWARF debug info that are not ready for
+ newer revisions of DWARF, you may wish to choose this or have your
+ config select this.
+
+config DEBUG_INFO_DWARF5
+ bool "Generate DWARF Version 5 debuginfo"
+ select DEBUG_INFO
+ depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_LEB128)
+ help
+ Generate DWARF v5 debug info. Requires binutils 2.35.2, gcc 5.0+ (gcc
+ 5.0+ accepts the -gdwarf-5 flag but only had partial support for some
+ draft features until 7.0), and gdb 8.0+.
+
+ Changes to the structure of debug info in Version 5 allow for around
+ 15-18% savings in resulting image and debug info section sizes as
+ compared to DWARF Version 4. DWARF Version 5 standardizes previous
+ extensions such as accelerators for symbol indexing and the format
+ for fission (.dwo/.dwp) files. Users may not want to select this
+ config if they rely on tooling that has not yet been updated to
+ support DWARF Version 5.
+
+endchoice # "Debug information"
+
+if DEBUG_INFO
config DEBUG_INFO_REDUCED
bool "Reduce debugging information"
- depends on DEBUG_INFO
help
If you say Y here gcc is instructed to generate less debugging
information for structure types. This means that tools that
@@ -212,9 +312,23 @@ config DEBUG_INFO_REDUCED
DEBUG_INFO build and compile times are reduced too.
Only works with newer gcc versions.
+config DEBUG_INFO_COMPRESSED
+ bool "Compressed debugging information"
+ depends on $(cc-option,-gz=zlib)
+ depends on $(ld-option,--compress-debug-sections=zlib)
+ help
+ Compress the debug information using zlib. Requires GCC 5.0+ or Clang
+ 5.0+, binutils 2.26+, and zlib.
+
+ Users of dpkg-deb via scripts/package/builddeb may find an increase in
+ size of their debug .deb packages with this config set, due to the
+ debug info being compressed with zlib, then the object files being
+ recompressed with a different compression scheme. But this is still
+ preferable to setting $KDEB_COMPRESS to "none" which would be even
+ larger.
+
config DEBUG_INFO_SPLIT
bool "Produce split debuginfo in .dwo files"
- depends on DEBUG_INFO
depends on $(cc-option,-gsplit-dwarf)
help
Generate debug info into separate .dwo files. This significantly
@@ -228,27 +342,46 @@ config DEBUG_INFO_SPLIT
to know about the .dwo files and include them.
Incompatible with older versions of ccache.
-config DEBUG_INFO_DWARF4
- bool "Generate dwarf4 debuginfo"
- depends on DEBUG_INFO
- depends on $(cc-option,-gdwarf-4)
- help
- Generate dwarf4 debug info. This requires recent versions
- of gcc and gdb. It makes the debug information larger.
- But it significantly improves the success of resolving
- variables in gdb on optimized code.
-
config DEBUG_INFO_BTF
bool "Generate BTF typeinfo"
- depends on DEBUG_INFO
+ depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
+ depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
+ depends on BPF_SYSCALL
+ depends on !DEBUG_INFO_DWARF5 || PAHOLE_VERSION >= 121
help
Generate deduplicated BTF type information from DWARF debug info.
Turning this on expects presence of pahole tool, which will convert
DWARF type info into equivalent deduplicated BTF type info.
+config PAHOLE_HAS_SPLIT_BTF
+ def_bool PAHOLE_VERSION >= 119
+
+config PAHOLE_HAS_BTF_TAG
+ def_bool PAHOLE_VERSION >= 123
+ depends on CC_IS_CLANG
+ help
+ Decide whether pahole emits btf_tag attributes (btf_type_tag and
+ btf_decl_tag) or not. Currently only clang compiler implements
+ these attributes, so make the config depend on CC_IS_CLANG.
+
+config DEBUG_INFO_BTF_MODULES
+ def_bool y
+ depends on DEBUG_INFO_BTF && MODULES && PAHOLE_HAS_SPLIT_BTF
+ help
+ Generate compact split BTF type information for kernel modules.
+
+config MODULE_ALLOW_BTF_MISMATCH
+ bool "Allow loading modules with non-matching BTF type info"
+ depends on DEBUG_INFO_BTF_MODULES
+ help
+ For modules whose split BTF does not match vmlinux, load without
+ BTF rather than refusing to load. The default behavior with
+ module BTF enabled is to reject modules with such mismatches;
+ this option will still load module BTF where possible but ignore
+ it when a mismatch is found.
+
config GDB_SCRIPTS
bool "Provide GDB scripts for kernel debugging"
- depends on DEBUG_INFO
help
This creates the required links to GDB helper scripts in the
build directory. If you load vmlinux into gdb, the helper
@@ -257,26 +390,21 @@ config GDB_SCRIPTS
instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
for further details.
-config ENABLE_MUST_CHECK
- bool "Enable __must_check logic"
- default y
- help
- Enable the __must_check logic in the kernel build. Disable this to
- suppress the "warning: ignoring return value of 'foo', declared with
- attribute warn_unused_result" messages.
+endif # DEBUG_INFO
config FRAME_WARN
- int "Warn for stack frames larger than (needs gcc 4.4)"
+ int "Warn for stack frames larger than"
range 0 8192
+ default 0 if KMSAN
default 2048 if GCC_PLUGIN_LATENT_ENTROPY
- default 1280 if (!64BIT && PARISC)
- default 1024 if (!64BIT && !PARISC)
+ default 2048 if PARISC
+ default 1536 if (!64BIT && XTENSA)
+ default 1024 if !64BIT
default 2048 if 64BIT
help
- Tell gcc to warn at build time for stack frames larger than this.
+ Tell the compiler to warn at build time for stack frames larger than this.
Setting this too low will cause a lot of warnings.
Setting it to 0 disables the warning.
- Requires gcc 4.4
config STRIP_ASM_SYMS
bool "Strip assembler-generated symbols during link"
@@ -289,6 +417,7 @@ config STRIP_ASM_SYMS
config READABLE_ASM
bool "Generate readable assembler code"
depends on DEBUG_KERNEL
+ depends on CC_IS_GCC
help
Disable some compiler optimizations that tend to generate human unreadable
assembler output. This may make the kernel slightly slower, but it helps
@@ -305,20 +434,9 @@ config HEADERS_INSTALL
user-space program samples. It is also needed by some features such
as uapi header sanity checks.
-config OPTIMIZE_INLINING
- def_bool y
- help
- This option determines if the kernel forces gcc to inline the functions
- developers have marked 'inline'. Doing so takes away freedom from gcc to
- do what it thinks is best, which is desirable for the gcc 3.x series of
- compilers. The gcc 4.x series have a rewritten inlining algorithm and
- enabling this option will generate a smaller kernel there. Hopefully
- this algorithm is so good that allowing gcc 4.x and above to make the
- decision will become the default in the future. Until then this option
- is there to test gcc for this.
-
config DEBUG_SECTION_MISMATCH
bool "Enable full Section mismatch analysis"
+ depends on CC_IS_GCC
help
The section mismatch analysis checks if there are illegal
references from one section to another section.
@@ -347,6 +465,18 @@ config SECTION_MISMATCH_WARN_ONLY
If unsure, say Y.
+config DEBUG_FORCE_FUNCTION_ALIGN_64B
+ bool "Force all function address 64B aligned"
+ depends on EXPERT && (X86_64 || ARM64 || PPC32 || PPC64 || ARC)
+ help
+ There are cases that a commit from one domain changes the function
+ address alignment of other domains, and cause magic performance
+ bump (regression or improvement). Enable this option will help to
+ verify if the bump is caused by function alignment changes, while
+ it will slightly increase the kernel size and affect icache usage.
+
+ It is mainly for debug and performance tuning use.
+
#
# Select this config option from the architecture Kconfig, if it
# is preferred to always offer frame pointers as a config
@@ -364,20 +494,36 @@ config FRAME_POINTER
larger and slower, but it gives very useful debugging information
in case of kernel bugs. (precise oopses/stacktraces/warnings)
+config OBJTOOL
+ bool
+
config STACK_VALIDATION
bool "Compile-time stack metadata validation"
- depends on HAVE_STACK_VALIDATION
+ depends on HAVE_STACK_VALIDATION && UNWINDER_FRAME_POINTER
+ select OBJTOOL
default n
help
- Add compile-time checks to validate stack metadata, including frame
- pointers (if CONFIG_FRAME_POINTER is enabled). This helps ensure
- that runtime stack traces are more reliable.
-
- This is also a prerequisite for generation of ORC unwind data, which
- is needed for CONFIG_UNWINDER_ORC.
+ Validate frame pointer rules at compile-time. This helps ensure that
+ runtime stack traces are more reliable.
For more information, see
- tools/objtool/Documentation/stack-validation.txt.
+ tools/objtool/Documentation/objtool.txt.
+
+config NOINSTR_VALIDATION
+ bool
+ depends on HAVE_NOINSTR_VALIDATION && DEBUG_ENTRY
+ select OBJTOOL
+ default y
+
+config VMLINUX_MAP
+ bool "Generate vmlinux.map file when linking"
+ depends on EXPERT
+ help
+ Selecting this option will pass "-Map=vmlinux.map" to ld
+ when linking vmlinux. That file can be useful for verifying
+ and debugging magic section games, and for seeing which
+ pieces of code get eliminated with
+ CONFIG_LD_DEAD_CODE_DATA_ELIMINATION.
config DEBUG_FORCE_WEAK_PER_CPU
bool "Force weak per-cpu definitions"
@@ -431,6 +577,16 @@ config MAGIC_SYSRQ_SERIAL
This option allows you to decide whether you want to enable the
magic SysRq key.
+config MAGIC_SYSRQ_SERIAL_SEQUENCE
+ string "Char sequence that enables magic SysRq over serial"
+ depends on MAGIC_SYSRQ_SERIAL
+ default ""
+ help
+ Specifies a sequence of characters that can follow BREAK to enable
+ SysRq on a serial console.
+
+ If unsure, leave an empty string and the option will not be enabled.
+
config DEBUG_FS
bool "Debug Filesystem"
help
@@ -443,26 +599,49 @@ config DEBUG_FS
If unsure, say N.
-source "lib/Kconfig.kgdb"
+choice
+ prompt "Debugfs default access"
+ depends on DEBUG_FS
+ default DEBUG_FS_ALLOW_ALL
+ help
+ This selects the default access restrictions for debugfs.
+ It can be overridden with kernel command line option
+ debugfs=[on,no-mount,off]. The restrictions apply for API access
+ and filesystem registration.
+
+config DEBUG_FS_ALLOW_ALL
+ bool "Access normal"
+ help
+ No restrictions apply. Both API and filesystem registration
+ is on. This is the normal default operation.
+
+config DEBUG_FS_DISALLOW_MOUNT
+ bool "Do not register debugfs as filesystem"
+ help
+ The API is open but filesystem is not loaded. Clients can still do
+ their work and read with debug tools that do not need
+ debugfs filesystem.
+
+config DEBUG_FS_ALLOW_NONE
+ bool "No access"
+ help
+ Access is off. Clients get -PERM when trying to create nodes in
+ debugfs tree and debugfs is not registered as a filesystem.
+ Client can then back-off or continue without debugfs access.
+
+endchoice
+source "lib/Kconfig.kgdb"
source "lib/Kconfig.ubsan"
+source "lib/Kconfig.kcsan"
endmenu
-config DEBUG_KERNEL
- bool "Kernel debugging"
- help
- Say Y here if you are developing drivers or trying to debug and
- identify kernel problems.
+menu "Networking Debugging"
-config DEBUG_MISC
- bool "Miscellaneous debug code"
- default DEBUG_KERNEL
- depends on DEBUG_KERNEL
- help
- Say Y here if you need to enable miscellaneous debug code that should
- be under a more specific debug option but isn't.
+source "net/Kconfig.debug"
+endmenu # "Networking Debugging"
menu "Memory Debugging"
@@ -529,39 +708,13 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
help
Debug objects boot parameter default value
-config DEBUG_SLAB
- bool "Debug slab memory allocations"
- depends on DEBUG_KERNEL && SLAB
- help
- Say Y here to have the kernel do limited verification on memory
- allocation as well as poisoning memory on free to catch use of freed
- memory. This can make kmalloc/kfree-intensive workloads much slower.
-
-config SLUB_DEBUG_ON
- bool "SLUB debugging on by default"
- depends on SLUB && SLUB_DEBUG
- default n
- help
- Boot with debugging on by default. SLUB boots by default with
- the runtime debug capabilities switched off. Enabling this is
- equivalent to specifying the "slub_debug" parameter on boot.
- There is no support for more fine grained debug control like
- possible with slub_debug=xxx. SLUB debugging may be switched
- off in a kernel built with CONFIG_SLUB_DEBUG_ON by specifying
- "slub_debug=-".
-
-config SLUB_STATS
- default n
- bool "Enable SLUB performance statistics"
- depends on SLUB && SYSFS
+config SHRINKER_DEBUG
+ bool "Enable shrinker debugging support"
+ depends on DEBUG_FS
help
- SLUB statistics are useful to debug SLUBs allocation behavior in
- order find ways to optimize the allocator. This should never be
- enabled for production use since keeping statistics slows down
- the allocator by a few percentage points. The slabinfo command
- supports the determination of the most active slabs to figure
- out which slabs are relevant to a particular load.
- Try running: slabinfo -DA
+ Say Y to enable the shrinker debugfs interface which provides
+ visibility into the kernel memory shrinkers subsystem.
+ Disable it to avoid an extra memory footprint.
config HAVE_DEBUG_KMEMLEAK
bool
@@ -653,6 +806,15 @@ config SCHED_STACK_END_CHECK
data corruption or a sporadic crash at a later stage once the region
is examined. The runtime overhead introduced is minimal.
+config ARCH_HAS_DEBUG_VM_PGTABLE
+ bool
+ help
+ An architecture should select this when it can successfully
+ build and run DEBUG_VM_PGTABLE.
+
+config DEBUG_VM_IRQSOFF
+ def_bool DEBUG_VM && !PREEMPT_RT
+
config DEBUG_VM
bool "Debug VM"
depends on DEBUG_KERNEL
@@ -662,13 +824,12 @@ config DEBUG_VM
If unsure, say N.
-config DEBUG_VM_VMACACHE
- bool "Debug VMA caching"
+config DEBUG_VM_MAPLE_TREE
+ bool "Debug VM maple trees"
depends on DEBUG_VM
+ select DEBUG_MAPLE_TREE
help
- Enable this to turn on VMA caching debug information. Doing so
- can cause significant overhead, so only enable it in non-production
- environments.
+ Enable VM maple tree debugging information and extra validations.
If unsure, say N.
@@ -688,6 +849,22 @@ config DEBUG_VM_PGFLAGS
If unsure, say N.
+config DEBUG_VM_PGTABLE
+ bool "Debug arch page table for semantics compliance"
+ depends on MMU
+ depends on ARCH_HAS_DEBUG_VM_PGTABLE
+ default y if DEBUG_VM
+ help
+ This option provides a debug method which can be used to test
+ architecture page table helper functions on various platforms in
+ verifying if they comply with expected generic MM semantics. This
+ will help architecture code in making sure that any changes or
+ new additions of these helpers still conform to expected
+ semantics of the generic MM. Platforms will have to opt in for
+ this through ARCH_HAS_DEBUG_VM_PGTABLE.
+
+ If unsure, say N.
+
config ARCH_HAS_DEBUG_VIRTUAL
bool
@@ -721,7 +898,7 @@ config DEBUG_MEMORY_INIT
config MEMORY_NOTIFIER_ERROR_INJECT
tristate "Memory hotplug notifier error injection module"
- depends on MEMORY_HOTPLUG_SPARSE && NOTIFIER_ERROR_INJECTION
+ depends on MEMORY_HOTPLUG && NOTIFIER_ERROR_INJECTION
help
This option provides the ability to inject artificial errors to
memory hotplug notifier chain callbacks. It is controlled through
@@ -753,9 +930,31 @@ config DEBUG_PER_CPU_MAPS
Say N if unsure.
+config DEBUG_KMAP_LOCAL
+ bool "Debug kmap_local temporary mappings"
+ depends on DEBUG_KERNEL && KMAP_LOCAL
+ help
+ This option enables additional error checking for the kmap_local
+ infrastructure. Disable for production use.
+
+config ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
+ bool
+
+config DEBUG_KMAP_LOCAL_FORCE_MAP
+ bool "Enforce kmap_local temporary mappings"
+ depends on DEBUG_KERNEL && ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
+ select KMAP_LOCAL
+ select DEBUG_KMAP_LOCAL
+ help
+ This option enforces temporary mappings through the kmap_local
+ mechanism for non-highmem pages and on non-highmem systems.
+ Disable this for production systems!
+
config DEBUG_HIGHMEM
bool "Highmem debugging"
depends on DEBUG_KERNEL && HIGHMEM
+ select DEBUG_KMAP_LOCAL_FORCE_MAP if ARCH_SUPPORTS_KMAP_LOCAL_FORCE_MAP
+ select DEBUG_KMAP_LOCAL
help
This option enables additional error checking for high memory
systems. Disable for production systems.
@@ -766,7 +965,7 @@ config HAVE_DEBUG_STACKOVERFLOW
config DEBUG_STACKOVERFLOW
bool "Check for stack overflows"
depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
- ---help---
+ help
Say Y here if you want to check for overflows of kernel, IRQ
and exception stacks (if your architecture uses them). This
option will show detailed messages if free stack space drops
@@ -782,6 +981,8 @@ config DEBUG_STACKOVERFLOW
If in doubt, say "N".
source "lib/Kconfig.kasan"
+source "lib/Kconfig.kfence"
+source "lib/Kconfig.kmsan"
endmenu # "Memory Debugging"
@@ -789,10 +990,10 @@ config DEBUG_SHIRQ
bool "Debug shared IRQ handlers"
depends on DEBUG_KERNEL
help
- Enable this to generate a spurious interrupt as soon as a shared
- interrupt handler is registered, and just before one is deregistered.
- Drivers ought to be able to handle interrupts coming in at those
- points; some don't and need to be caught.
+ Enable this to generate a spurious interrupt just before a shared
+ interrupt handler is deregistered (generating one when registering
+ is currently disabled). Drivers need to handle this correctly. Some
+ don't and need to be caught.
menu "Debug Oops, Lockups and Hangs"
@@ -819,7 +1020,7 @@ config PANIC_TIMEOUT
int "panic timeout"
default 0
help
- Set the timeout value (in seconds) until a reboot occurs when the
+ Set the timeout value (in seconds) until a reboot occurs when
the kernel panics. If n = 0, then we wait forever. A timeout
value n > 0 will wait n seconds before rebooting, while a timeout
value n < 0 will reboot immediately.
@@ -857,13 +1058,6 @@ config BOOTPARAM_SOFTLOCKUP_PANIC
Say N if unsure.
-config BOOTPARAM_SOFTLOCKUP_PANIC_VALUE
- int
- depends on SOFTLOCKUP_DETECTOR
- range 0 1
- default 0 if !BOOTPARAM_SOFTLOCKUP_PANIC
- default 1 if BOOTPARAM_SOFTLOCKUP_PANIC
-
config HARDLOCKUP_DETECTOR_PERF
bool
select SOFTLOCKUP_DETECTOR
@@ -885,7 +1079,6 @@ config HARDLOCKUP_DETECTOR
depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_ARCH
select LOCKUP_DETECTOR
select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF
- select HARDLOCKUP_DETECTOR_ARCH if HAVE_HARDLOCKUP_DETECTOR_ARCH
help
Say Y here to enable the kernel to act as a watchdog to detect
hard lockups.
@@ -906,13 +1099,6 @@ config BOOTPARAM_HARDLOCKUP_PANIC
Say N if unsure.
-config BOOTPARAM_HARDLOCKUP_PANIC_VALUE
- int
- depends on HARDLOCKUP_DETECTOR
- range 0 1
- default 0 if !BOOTPARAM_HARDLOCKUP_PANIC
- default 1 if BOOTPARAM_HARDLOCKUP_PANIC
-
config DETECT_HUNG_TASK
bool "Detect Hung Tasks"
depends on DEBUG_KERNEL
@@ -960,13 +1146,6 @@ config BOOTPARAM_HUNG_TASK_PANIC
Say N if unsure.
-config BOOTPARAM_HUNG_TASK_PANIC_VALUE
- int
- depends on DETECT_HUNG_TASK
- range 0 1
- default 0 if !BOOTPARAM_HUNG_TASK_PANIC
- default 1 if BOOTPARAM_HUNG_TASK_PANIC
-
config WQ_WATCHDOG
bool "Detect Workqueue Stalls"
depends on DEBUG_KERNEL
@@ -978,6 +1157,19 @@ config WQ_WATCHDOG
state. This can be configured through kernel parameter
"workqueue.watchdog_thresh" and its sysfs counterpart.
+config TEST_LOCKUP
+ tristate "Test module to generate lockups"
+ depends on m
+ help
+ This builds the "test_lockup" module that helps to make sure
+ that watchdogs and lockup detectors are working properly.
+
+ Depending on module parameters it could emulate soft or hard
+ lockup, "hung task", or locking arbitrary lock for a long time.
+ Also it could generate series of lockups with cooling-down periods.
+
+ If unsure, say N.
+
endmenu # "Debug lockups and hangs"
menu "Scheduler Debugging"
@@ -1045,11 +1237,12 @@ config PROVE_LOCKING
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select LOCKDEP
select DEBUG_SPINLOCK
- select DEBUG_MUTEXES
+ select DEBUG_MUTEXES if !PREEMPT_RT
select DEBUG_RT_MUTEXES if RT_MUTEXES
select DEBUG_RWSEMS
select DEBUG_WW_MUTEX_SLOWPATH
select DEBUG_LOCK_ALLOC
+ select PREEMPT_COUNT if !ARCH_NO_PREEMPT
select TRACE_IRQFLAGS
default n
help
@@ -1086,12 +1279,29 @@ config PROVE_LOCKING
For more details, see Documentation/locking/lockdep-design.rst.
+config PROVE_RAW_LOCK_NESTING
+ bool "Enable raw_spinlock - spinlock nesting checks"
+ depends on PROVE_LOCKING
+ default n
+ help
+ Enable the raw_spinlock vs. spinlock nesting checks which ensure
+ that the lock nesting rules for PREEMPT_RT enabled kernels are
+ not violated.
+
+ NOTE: There are known nesting problems. So if you enable this
+ option expect lockdep splats until these problems have been fully
+ addressed which is work in progress. This config switch allows to
+ identify and analyze these problems. It will be removed and the
+ check permanently enabled once the main issues have been fixed.
+
+ If unsure, select N.
+
config LOCK_STAT
bool "Lock usage statistics"
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select LOCKDEP
select DEBUG_SPINLOCK
- select DEBUG_MUTEXES
+ select DEBUG_MUTEXES if !PREEMPT_RT
select DEBUG_RT_MUTEXES if RT_MUTEXES
select DEBUG_LOCK_ALLOC
default n
@@ -1127,7 +1337,7 @@ config DEBUG_SPINLOCK
config DEBUG_MUTEXES
bool "Mutex debugging: basic checks"
- depends on DEBUG_KERNEL
+ depends on DEBUG_KERNEL && !PREEMPT_RT
help
This feature allows mutex semantics violations to be detected and
reported.
@@ -1137,7 +1347,8 @@ config DEBUG_WW_MUTEX_SLOWPATH
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select DEBUG_LOCK_ALLOC
select DEBUG_SPINLOCK
- select DEBUG_MUTEXES
+ select DEBUG_MUTEXES if !PREEMPT_RT
+ select DEBUG_RT_MUTEXES if PREEMPT_RT
help
This feature enables slowpath testing for w/w mutex users by
injecting additional -EDEADLK wound/backoff cases. Together with
@@ -1160,7 +1371,7 @@ config DEBUG_LOCK_ALLOC
bool "Lock debugging: detect incorrect freeing of live locks"
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select DEBUG_SPINLOCK
- select DEBUG_MUTEXES
+ select DEBUG_MUTEXES if !PREEMPT_RT
select DEBUG_RT_MUTEXES if RT_MUTEXES
select LOCKDEP
help
@@ -1175,16 +1386,56 @@ config LOCKDEP
bool
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
select STACKTRACE
- select FRAME_POINTER if !MIPS && !PPC && !ARM && !S390 && !MICROBLAZE && !ARC && !X86
select KALLSYMS
select KALLSYMS_ALL
config LOCKDEP_SMALL
bool
+config LOCKDEP_BITS
+ int "Bitsize for MAX_LOCKDEP_ENTRIES"
+ depends on LOCKDEP && !LOCKDEP_SMALL
+ range 10 30
+ default 15
+ help
+ Try increasing this value if you hit "BUG: MAX_LOCKDEP_ENTRIES too low!" message.
+
+config LOCKDEP_CHAINS_BITS
+ int "Bitsize for MAX_LOCKDEP_CHAINS"
+ depends on LOCKDEP && !LOCKDEP_SMALL
+ range 10 30
+ default 16
+ help
+ Try increasing this value if you hit "BUG: MAX_LOCKDEP_CHAINS too low!" message.
+
+config LOCKDEP_STACK_TRACE_BITS
+ int "Bitsize for MAX_STACK_TRACE_ENTRIES"
+ depends on LOCKDEP && !LOCKDEP_SMALL
+ range 10 30
+ default 19
+ help
+ Try increasing this value if you hit "BUG: MAX_STACK_TRACE_ENTRIES too low!" message.
+
+config LOCKDEP_STACK_TRACE_HASH_BITS
+ int "Bitsize for STACK_TRACE_HASH_SIZE"
+ depends on LOCKDEP && !LOCKDEP_SMALL
+ range 10 30
+ default 14
+ help
+ Try increasing this value if you need large MAX_STACK_TRACE_ENTRIES.
+
+config LOCKDEP_CIRCULAR_QUEUE_BITS
+ int "Bitsize for elements in circular_queue struct"
+ depends on LOCKDEP
+ range 10 30
+ default 12
+ help
+ Try increasing this value if you hit "lockdep bfs error:-1" warning due to __cq_enqueue() failure.
+
config DEBUG_LOCKDEP
bool "Lock dependency engine debugging"
depends on DEBUG_KERNEL && LOCKDEP
+ select DEBUG_IRQFLAGS
help
If you say Y here, the lock dependency engine will do
additional runtime checks to debug itself, at the price
@@ -1208,7 +1459,7 @@ config DEBUG_LOCKING_API_SELFTESTS
Say Y here if you want the kernel to run a short self-test during
bootup. The self-test checks whether common types of locking bugs
are detected by debugging mechanisms or not. (if you disable
- lock debugging then those bugs wont be detected of course.)
+ lock debugging then those bugs won't be detected of course.)
The following locking APIs are covered: spinlocks, rwlocks,
mutexes and rwsems.
@@ -1238,14 +1489,48 @@ config WW_MUTEX_SELFTEST
Say M if you want these self tests to build as a module.
Say N if you are unsure.
+config SCF_TORTURE_TEST
+ tristate "torture tests for smp_call_function*()"
+ depends on DEBUG_KERNEL
+ select TORTURE_TEST
+ help
+ This option provides a kernel module that runs torture tests
+ on the smp_call_function() family of primitives. The kernel
+ module may be built after the fact on the running kernel to
+ be tested, if desired.
+
+config CSD_LOCK_WAIT_DEBUG
+ bool "Debugging for csd_lock_wait(), called from smp_call_function*()"
+ depends on DEBUG_KERNEL
+ depends on 64BIT
+ default n
+ help
+ This option enables debug prints when CPUs are slow to respond
+ to the smp_call_function*() IPI wrappers. These debug prints
+ include the IPI handler function currently executing (if any)
+ and relevant stack traces.
+
endmenu # lock debugging
config TRACE_IRQFLAGS
+ depends on TRACE_IRQFLAGS_SUPPORT
bool
help
Enables hooks to interrupt enabling and disabling for
either tracing or lock debugging.
+config TRACE_IRQFLAGS_NMI
+ def_bool y
+ depends on TRACE_IRQFLAGS
+ depends on TRACE_IRQFLAGS_NMI_SUPPORT
+
+config DEBUG_IRQFLAGS
+ bool "Debug IRQ flag manipulation"
+ help
+ Enables checks for potentially unsafe enabling or disabling of
+ interrupts, such as calling raw_local_irq_restore() when interrupts
+ are enabled.
+
config STACKTRACE
bool "Stack backtrace support"
depends on STACKTRACE_SUPPORT
@@ -1274,8 +1559,7 @@ config WARN_ALL_UNSEEDED_RANDOM
so architecture maintainers really need to do what they can
to get the CRNG seeded sooner after the system is booted.
However, since users cannot do anything actionable to
- address this, by default the kernel will issue only a single
- warning for the first use of unseeded randomness.
+ address this, by default this option is disabled.
Say Y here if you want to receive warnings for all uses of
unseeded randomness. This will be of use primarily for
@@ -1296,7 +1580,7 @@ config DEBUG_KOBJECT_RELEASE
help
kobjects are reference counted objects. This means that their
last reference count put is not predictable, and the kobject can
- live on past the point at which a driver decides to drop it's
+ live on past the point at which a driver decides to drop its
initial reference to the kobject gained on allocation. An
example of this would be a struct device which has just been
unregistered.
@@ -1363,6 +1647,14 @@ config BUG_ON_DATA_CORRUPTION
If unsure, say N.
+config DEBUG_MAPLE_TREE
+ bool "Debug maple trees"
+ depends on DEBUG_KERNEL
+ help
+ Enable maple tree debugging information and extra validations.
+
+ If unsure, say N.
+
endmenu
config DEBUG_CREDENTIALS
@@ -1397,33 +1689,6 @@ config DEBUG_WQ_FORCE_RR_CPU
feature by default. When enabled, memory and cache locality will
be impacted.
-config DEBUG_BLOCK_EXT_DEVT
- bool "Force extended block device numbers and spread them"
- depends on DEBUG_KERNEL
- depends on BLOCK
- default n
- help
- BIG FAT WARNING: ENABLING THIS OPTION MIGHT BREAK BOOTING ON
- SOME DISTRIBUTIONS. DO NOT ENABLE THIS UNLESS YOU KNOW WHAT
- YOU ARE DOING. Distros, please enable this and fix whatever
- is broken.
-
- Conventionally, block device numbers are allocated from
- predetermined contiguous area. However, extended block area
- may introduce non-contiguous block device numbers. This
- option forces most block device numbers to be allocated from
- the extended space and spreads them to discover kernel or
- userland code paths which assume predetermined contiguous
- device number allocation.
-
- Note that turning on this debug option shuffles all the
- device numbers for all IDE and SCSI devices including libata
- ones, so root partition specified using device number
- directly (via rdev or root=MAJ:MIN) won't work anymore.
- Textual device names (root=/dev/sdXn) will continue to work.
-
- Say N if you are unsure.
-
config CPU_HOTPLUG_STATE_CONTROL
bool "Enable CPU hotplug state control"
depends on DEBUG_KERNEL
@@ -1442,12 +1707,11 @@ config LATENCYTOP
depends on DEBUG_KERNEL
depends on STACKTRACE_SUPPORT
depends on PROC_FS
- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
+ depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
select KALLSYMS
select KALLSYMS_ALL
select STACKTRACE
select SCHEDSTATS
- select SCHED_DEBUG
help
Enable this option if you want to use the LatencyTOP tool
to find out which userspace is blocking on what kernel operations.
@@ -1481,7 +1745,7 @@ config PROVIDE_OHCI1394_DMA_INIT
This code (~1k) is freed after boot. By then, the firewire stack
in charge of the OHCI-1394 controllers should be used instead.
- See Documentation/debugging-via-ohci1394.txt for more information.
+ See Documentation/core-api/debugging-via-ohci1394.rst for more information.
source "samples/Kconfig"
@@ -1491,7 +1755,7 @@ config ARCH_HAS_DEVMEM_IS_ALLOWED
config STRICT_DEVMEM
bool "Filter access to /dev/mem"
depends on MMU && DEVMEM
- depends on ARCH_HAS_DEVMEM_IS_ALLOWED
+ depends on ARCH_HAS_DEVMEM_IS_ALLOWED || GENERIC_LIB_DEVMEM_IS_ALLOWED
default y if PPC || X86 || ARM64
help
If this option is disabled, you allow userspace (root) access to all
@@ -1628,11 +1892,18 @@ config FAILSLAB
Provide fault-injection capability for kmalloc.
config FAIL_PAGE_ALLOC
- bool "Fault-injection capabilitiy for alloc_pages()"
+ bool "Fault-injection capability for alloc_pages()"
depends on FAULT_INJECTION
help
Provide fault-injection capability for alloc_pages().
+config FAULT_INJECTION_USERCOPY
+ bool "Fault injection capability for usercopy functions"
+ depends on FAULT_INJECTION
+ help
+ Provides fault-injection capability to inject failures
+ in usercopy functions (copy_from_user(), get_user(), ...).
+
config FAIL_MAKE_REQUEST
bool "Fault-injection capability for disk IO"
depends on FAULT_INJECTION && BLOCK
@@ -1648,7 +1919,7 @@ config FAIL_IO_TIMEOUT
thus exercising the error handling.
Only works with drivers that use the generic timeout handling,
- for others it wont do anything.
+ for others it won't do anything.
config FAIL_FUTEX
bool "Fault-injection capability for futexes"
@@ -1683,12 +1954,19 @@ config FAIL_MMC_REQUEST
and to test how the mmc host driver handles retries from
the block device.
+config FAIL_SUNRPC
+ bool "Fault-injection capability for SunRPC"
+ depends on FAULT_INJECTION_DEBUG_FS && SUNRPC_DEBUG
+ help
+ Provide fault-injection capability for SunRPC and
+ its consumers.
+
config FAULT_INJECTION_STACKTRACE_FILTER
bool "stacktrace filter for fault-injection capabilities"
depends on FAULT_INJECTION_DEBUG_FS && STACKTRACE_SUPPORT
depends on !X86_64
select STACKTRACE
- select FRAME_POINTER if !MIPS && !PPC && !S390 && !MICROBLAZE && !ARM && !ARC && !X86
+ depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
help
Provide stacktrace filter for fault-injection capabilities
@@ -1707,8 +1985,11 @@ config KCOV
bool "Code coverage for fuzzing"
depends on ARCH_HAS_KCOV
depends on CC_HAS_SANCOV_TRACE_PC || GCC_PLUGINS
+ depends on !ARCH_WANTS_NO_INSTR || HAVE_NOINSTR_HACK || \
+ GCC_VERSION >= 120000 || CLANG_VERSION >= 130000
select DEBUG_FS
select GCC_PLUGIN_SANCOV if !CC_HAS_SANCOV_TRACE_PC
+ select OBJTOOL if HAVE_NOINSTR_HACK
help
KCOV exposes kernel code coverage information in a form suitable
for coverage-guided fuzzing (randomized testing).
@@ -1740,6 +2021,15 @@ config KCOV_INSTRUMENT_ALL
filesystem fuzzing with AFL) then you will want to enable coverage
for more specific subsets of files, and should say n here.
+config KCOV_IRQ_AREA_SIZE
+ hex "Size of interrupt coverage collection area in words"
+ depends on KCOV
+ default 0x40000
+ help
+ KCOV uses preallocated per-cpu areas to collect coverage from
+ soft interrupts. This specifies the size of those areas in the
+ number of unsigned long words.
+
menuconfig RUNTIME_TESTING_MENU
bool "Runtime Testing"
def_bool y
@@ -1759,9 +2049,22 @@ config LKDTM
Documentation on how to use the module can be found in
Documentation/fault-injection/provoke-crashes.rst
+config CPUMASK_KUNIT_TEST
+ tristate "KUnit test for cpumask" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enable to turn on cpumask tests, running at boot or module load time.
+
+ For more information on KUnit and unit tests in general, please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config TEST_LIST_SORT
- tristate "Linked list sorting test"
- depends on DEBUG_KERNEL || m
+ tristate "Linked list sorting test" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
help
Enable this to turn on 'list_sort()' function test. This test is
executed only once during system boot (so affects only boot time),
@@ -1769,19 +2072,42 @@ config TEST_LIST_SORT
If unsure, say N.
-config TEST_SORT
- tristate "Array-based sort test"
+config TEST_MIN_HEAP
+ tristate "Min heap test"
depends on DEBUG_KERNEL || m
help
+ Enable this to turn on min heap function tests. This test is
+ executed only once during system boot (so affects only boot time),
+ or at module load time.
+
+ If unsure, say N.
+
+config TEST_SORT
+ tristate "Array-based sort test" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
This option enables the self-test function of 'sort()' at boot,
or at module load time.
If unsure, say N.
+config TEST_DIV64
+ tristate "64bit/32bit division and modulo test"
+ depends on DEBUG_KERNEL || m
+ help
+ Enable this to turn on 'do_div()' function test. This test is
+ executed only once during system boot (so affects only boot time),
+ or at module load time.
+
+ If unsure, say N.
+
config KPROBES_SANITY_TEST
- bool "Kprobes sanity tests"
+ tristate "Kprobes sanity tests" if !KUNIT_ALL_TESTS
depends on DEBUG_KERNEL
depends on KPROBES
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
help
This option provides for testing basic kprobes functionality on
boot. Samples of kprobe and kretprobe are inserted and
@@ -1789,6 +2115,18 @@ config KPROBES_SANITY_TEST
Say N if you are unsure.
+config FPROBE_SANITY_TEST
+ bool "Self test for fprobe"
+ depends on DEBUG_KERNEL
+ depends on FPROBE
+ depends on KUNIT=y
+ help
+ This option will enable testing the fprobe when the system boot.
+ A series of tests are made to verify that the fprobe is functioning
+ properly.
+
+ Say N if you are unsure.
+
config BACKTRACE_SELF_TEST
tristate "Self test for the backtrace code"
depends on DEBUG_KERNEL
@@ -1803,6 +2141,16 @@ config BACKTRACE_SELF_TEST
Say N if you are unsure.
+config TEST_REF_TRACKER
+ tristate "Self test for reference tracker"
+ depends on DEBUG_KERNEL && STACKTRACE_SUPPORT
+ select REF_TRACKER
+ help
+ This option provides a kernel module performing tests
+ using reference tracker infrastructure.
+
+ Say N if you are unsure.
+
config RBTREE_TEST
tristate "Red-Black tree test"
depends on DEBUG_KERNEL
@@ -1850,7 +2198,7 @@ config ASYNC_RAID6_TEST
tristate "Self test for hardware accelerated raid6 recovery"
depends on ASYNC_RAID6_RECOV
select ASYNC_MEMCPY
- ---help---
+ help
This is a one-shot self test that permutes through the
recovery of all the possible two disk failure scenarios for a
N-disk array. Recovery is performed with the asynchronous
@@ -1862,6 +2210,9 @@ config ASYNC_RAID6_TEST
config TEST_HEXDUMP
tristate "Test functions located in the hexdump module at runtime"
+config STRING_SELFTEST
+ tristate "Test string functions at runtime"
+
config TEST_STRING_HELPERS
tristate "Test functions located in the string_helpers module at runtime"
@@ -1874,6 +2225,9 @@ config TEST_KSTRTOX
config TEST_PRINTF
tristate "Test printf() family of functions at runtime"
+config TEST_SCANF
+ tristate "Test scanf() family of functions at runtime"
+
config TEST_BITMAP
tristate "Test bitmap_*() family of functions at runtime"
help
@@ -1881,21 +2235,15 @@ config TEST_BITMAP
If unsure, say N.
-config TEST_BITFIELD
- tristate "Test bitfield functions at runtime"
- help
- Enable this option to test the bitfield functions at boot.
-
- If unsure, say N.
-
config TEST_UUID
tristate "Test functions located in the uuid module at runtime"
config TEST_XARRAY
tristate "Test the XArray code at runtime"
-config TEST_OVERFLOW
- tristate "Test check_*_overflow() functions at runtime"
+config TEST_MAPLE_TREE
+ select DEBUG_MAPLE_TREE
+ tristate "Test the Maple Tree code at runtime"
config TEST_RHASHTABLE
tristate "Perform selftest on resizable hash table"
@@ -1904,12 +2252,11 @@ config TEST_RHASHTABLE
If unsure, say N.
-config TEST_HASH
- tristate "Perform selftest on hash functions"
+config TEST_SIPHASH
+ tristate "Perform selftest on siphash functions"
help
- Enable this option to test the kernel's integer (<linux/hash.h>),
- string (<linux/stringhash.h>), and siphash (<linux/siphash.h>)
- hash functions on boot (or module load).
+ Enable this option to test the kernel's siphash (<linux/siphash.h>) hash
+ functions on boot (or module load).
This is intended to help people writing architecture-specific
optimized versions. If unsure, say N.
@@ -1947,6 +2294,19 @@ config TEST_LKM
If unsure, say N.
+config TEST_BITOPS
+ tristate "Test module for compilation of bitops operations"
+ depends on m
+ help
+ This builds the "test_bitops" module that is much like the
+ TEST_LKM module except that it does a basic exercise of the
+ set/clear_bit macros and get_count_order/long to make sure there are
+ no compiler warnings from C=1 sparse checker or -Wextra
+ compilations. It has no dependencies and doesn't run or load unless
+ explicitly requested by name. for example: modprobe test_bitops.
+
+ If unsure, say N.
+
config TEST_VMALLOC
tristate "Test module for stress/performance analysis of vmalloc allocator"
default n
@@ -2024,9 +2384,58 @@ config TEST_SYSCTL
If unsure, say N.
+config BITFIELD_KUNIT
+ tristate "KUnit test bitfield functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enable this option to test the bitfield functions at boot.
+
+ KUnit tests run during boot and output the results to the debug log
+ in TAP format (http://testanything.org/). Only useful for kernel devs
+ running the KUnit test harness, and not intended for inclusion into a
+ production build.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config HASH_KUNIT_TEST
+ tristate "KUnit Test for integer hash functions" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Enable this option to test the kernel's string (<linux/stringhash.h>), and
+ integer (<linux/hash.h>) hash functions on boot.
+
+ KUnit tests run during boot and output the results to the debug log
+ in TAP format (https://testanything.org/). Only useful for kernel devs
+ running the KUnit test harness, and not intended for inclusion into a
+ production build.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ This is intended to help people writing architecture-specific
+ optimized versions. If unsure, say N.
+
+config RESOURCE_KUNIT_TEST
+ tristate "KUnit test for resource API" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the resource API unit test.
+ Tests the logic of API provided by resource.c and ioport.h.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
config SYSCTL_KUNIT_TEST
- tristate "KUnit test for sysctl"
+ tristate "KUnit test for sysctl" if !KUNIT_ALL_TESTS
depends on KUNIT
+ default KUNIT_ALL_TESTS
help
This builds the proc sysctl unit test, which runs on boot.
Tests the API contract and implementation correctness of sysctl.
@@ -2036,15 +2445,16 @@ config SYSCTL_KUNIT_TEST
If unsure, say N.
config LIST_KUNIT_TEST
- tristate "KUnit Test for Kernel Linked-list structures"
+ tristate "KUnit Test for Kernel Linked-list structures" if !KUNIT_ALL_TESTS
depends on KUNIT
+ default KUNIT_ALL_TESTS
help
This builds the linked list KUnit test suite.
It tests that the API and basic functionality of the list_head type
and associated macros.
KUnit tests run during boot and output the results to the debug log
- in TAP format (http://testanything.org/). Only useful for kernel devs
+ in TAP format (https://testanything.org/). Only useful for kernel devs
running the KUnit test harness, and not intended for inclusion into a
production build.
@@ -2053,6 +2463,131 @@ config LIST_KUNIT_TEST
If unsure, say N.
+config LINEAR_RANGES_TEST
+ tristate "KUnit test for linear_ranges"
+ depends on KUNIT
+ select LINEAR_RANGES
+ help
+ This builds the linear_ranges unit test, which runs on boot.
+ Tests the linear_ranges logic correctness.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config CMDLINE_KUNIT_TEST
+ tristate "KUnit test for cmdline API" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the cmdline API unit test.
+ Tests the logic of API provided by cmdline.c.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config BITS_TEST
+ tristate "KUnit test for bits.h" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds the bits unit test.
+ Tests the logic of macros defined in bits.h.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config SLUB_KUNIT_TEST
+ tristate "KUnit test for SLUB cache error detection" if !KUNIT_ALL_TESTS
+ depends on SLUB_DEBUG && KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ This builds SLUB allocator unit test.
+ Tests SLUB cache debugging functionality.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config RATIONAL_KUNIT_TEST
+ tristate "KUnit test for rational.c" if !KUNIT_ALL_TESTS
+ depends on KUNIT && RATIONAL
+ default KUNIT_ALL_TESTS
+ help
+ This builds the rational math unit test.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config MEMCPY_KUNIT_TEST
+ tristate "Test memcpy(), memmove(), and memset() functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for memcpy(), memmove(), and memset() functions.
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config IS_SIGNED_TYPE_KUNIT_TEST
+ tristate "Test is_signed_type() macro" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for the is_signed_type() macro.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config OVERFLOW_KUNIT_TEST
+ tristate "Test check_*_overflow() functions at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for the check_*_overflow(), size_*(), allocation, and
+ related functions.
+
+ For more information on KUnit and unit tests in general please refer
+ to the KUnit documentation in Documentation/dev-tools/kunit/.
+
+ If unsure, say N.
+
+config STACKINIT_KUNIT_TEST
+ tristate "Test level of stack variable initialization" if !KUNIT_ALL_TESTS
+ depends on KUNIT
+ default KUNIT_ALL_TESTS
+ help
+ Test if the kernel is zero-initializing stack variables and
+ padding. Coverage is controlled by compiler flags,
+ CONFIG_INIT_STACK_ALL_PATTERN, CONFIG_INIT_STACK_ALL_ZERO,
+ CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
+ or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
+
+config FORTIFY_KUNIT_TEST
+ tristate "Test fortified str*() and mem*() function internals at runtime" if !KUNIT_ALL_TESTS
+ depends on KUNIT && FORTIFY_SOURCE
+ default KUNIT_ALL_TESTS
+ help
+ Builds unit tests for checking internals of FORTIFY_SOURCE as used
+ by the str*() and mem*() family of functions. For testing runtime
+ traps of FORTIFY_SOURCE, see LKDTM's "FORTIFY_*" tests.
+
+config HW_BREAKPOINT_KUNIT_TEST
+ bool "Test hw_breakpoint constraints accounting" if !KUNIT_ALL_TESTS
+ depends on HAVE_HW_BREAKPOINT
+ depends on KUNIT=y
+ default KUNIT_ALL_TESTS
+ help
+ Tests for hw_breakpoint constraints accounting.
+
+ If unsure, say N.
+
config TEST_UDELAY
tristate "udelay test driver"
help
@@ -2069,11 +2604,22 @@ config TEST_STATIC_KEYS
If unsure, say N.
+config TEST_DYNAMIC_DEBUG
+ tristate "Test DYNAMIC_DEBUG"
+ depends on DYNAMIC_DEBUG
+ help
+ This module registers a tracer callback to count enabled
+ pr_debugs in a 'do_debugging' function, then alters their
+ enablements, calls the function, and compares counts.
+
+ If unsure, say N.
+
config TEST_KMOD
tristate "kmod stress tester"
depends on m
depends on NETDEVICES && NET_CORE && INET # for TUN
depends on BLOCK
+ depends on PAGE_SIZE_LESS_THAN_256KB # for BTRFS
select TEST_LKM
select XFS_FS
select TUN
@@ -2143,32 +2689,73 @@ config TEST_OBJAGG
Enable this option to test object aggregation manager on boot
(or module load).
+config TEST_MEMINIT
+ tristate "Test heap/page initialization"
+ help
+ Test if the kernel is zero-initializing heap and page allocations.
+ This can be useful to test init_on_alloc and init_on_free features.
+
+ If unsure, say N.
-config TEST_STACKINIT
- tristate "Test level of stack variable initialization"
+config TEST_HMM
+ tristate "Test HMM (Heterogeneous Memory Management)"
+ depends on TRANSPARENT_HUGEPAGE
+ depends on DEVICE_PRIVATE
+ select HMM_MIRROR
+ select MMU_NOTIFIER
help
- Test if the kernel is zero-initializing stack variables and
- padding. Coverage is controlled by compiler flags,
- CONFIG_GCC_PLUGIN_STRUCTLEAK, CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF,
- or CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL.
+ This is a pseudo device driver solely for testing HMM.
+ Say M here if you want to build the HMM test module.
+ Doing so will allow you to run tools/testing/selftest/vm/hmm-tests.
If unsure, say N.
-config TEST_MEMINIT
- tristate "Test heap/page initialization"
+config TEST_FREE_PAGES
+ tristate "Test freeing pages"
help
- Test if the kernel is zero-initializing heap and page allocations.
- This can be useful to test init_on_alloc and init_on_free features.
+ Test that a memory leak does not occur due to a race between
+ freeing a block of pages and a speculative page reference.
+ Loading this module is safe if your kernel has the bug fixed.
+ If the bug is not fixed, it will leak gigabytes of memory and
+ probably OOM your system.
+
+config TEST_FPU
+ tristate "Test floating point operations in kernel space"
+ depends on X86 && !KCOV_INSTRUMENT_ALL
+ help
+ Enable this option to add /sys/kernel/debug/selftest_helpers/test_fpu
+ which will trigger a sequence of floating point operations. This is used
+ for self-testing floating point control register setting in
+ kernel_fpu_begin().
+
+ If unsure, say N.
+
+config TEST_CLOCKSOURCE_WATCHDOG
+ tristate "Test clocksource watchdog in kernel space"
+ depends on CLOCKSOURCE_WATCHDOG
+ help
+ Enable this option to create a kernel module that will trigger
+ a test of the clocksource watchdog. This module may be loaded
+ via modprobe or insmod in which case it will run upon being
+ loaded, or it may be built in, in which case it will run
+ shortly after boot.
If unsure, say N.
endif # RUNTIME_TESTING_MENU
+config ARCH_USE_MEMTEST
+ bool
+ help
+ An architecture should select this when it uses early_memtest()
+ during boot process.
+
config MEMTEST
bool "Memtest"
- ---help---
+ depends on ARCH_USE_MEMTEST
+ help
This option adds a kernel parameter 'memtest', which allows memtest
- to be set.
+ to be set and executed.
memtest=0, mean disabled; -- default
memtest=1, mean do 1 test pattern;
...
@@ -2186,4 +2773,40 @@ config HYPERV_TESTING
endmenu # "Kernel Testing and Coverage"
+menu "Rust hacking"
+
+config RUST_DEBUG_ASSERTIONS
+ bool "Debug assertions"
+ depends on RUST
+ help
+ Enables rustc's `-Cdebug-assertions` codegen option.
+
+ This flag lets you turn `cfg(debug_assertions)` conditional
+ compilation on or off. This can be used to enable extra debugging
+ code in development but not in production. For example, it controls
+ the behavior of the standard library's `debug_assert!` macro.
+
+ Note that this will apply to all Rust code, including `core`.
+
+ If unsure, say N.
+
+config RUST_OVERFLOW_CHECKS
+ bool "Overflow checks"
+ default y
+ depends on RUST
+ help
+ Enables rustc's `-Coverflow-checks` codegen option.
+
+ This flag allows you to control the behavior of runtime integer
+ overflow. When overflow-checks are enabled, a Rust panic will occur
+ on overflow.
+
+ Note that this will apply to all Rust code, including `core`.
+
+ If unsure, say Y.
+
+endmenu # "Rust"
+
+source "Documentation/Kconfig"
+
endmenu # Kernel hacking