mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 13:11:40 +00:00
bf9aa14fc5
- The final step to get rid of auto-rearming posix-timers
posix-timers are currently auto-rearmed by the kernel when the signal
of the timer is ignored so that the timer signal can be delivered once
the corresponding signal is unignored.
This requires to throttle the timer to prevent a DoS by small intervals
and keeps the system pointlessly out of low power states for no value.
This is a long standing non-trivial problem due to the lock order of
posix-timer lock and the sighand lock along with life time issues as
the timer and the sigqueue have different life time rules.
Cure this by:
* Embedding the sigqueue into the timer struct to have the same life
time rules. Aside of that this also avoids the lookup of the timer
in the signal delivery and rearm path as it's just a always valid
container_of() now.
* Queuing ignored timer signals onto a seperate ignored list.
* Moving queued timer signals onto the ignored list when the signal is
switched to SIG_IGN before it could be delivered.
* Walking the ignored list when SIG_IGN is lifted and requeue the
signals to the actual signal lists. This allows the signal delivery
code to rearm the timer.
This also required to consolidate the signal delivery rules so they are
consistent across all situations. With that all self test scenarios
finally succeed.
- Core infrastructure for VFS multigrain timestamping
This is required to allow the kernel to use coarse grained time stamps
by default and switch to fine grained time stamps when inode attributes
are actively observed via getattr().
These changes have been provided to the VFS tree as well, so that the
VFS specific infrastructure could be built on top.
- Cleanup and consolidation of the sleep() infrastructure
* Move all sleep and timeout functions into one file
* Rework udelay() and ndelay() into proper documented inline functions
and replace the hardcoded magic numbers by proper defines.
* Rework the fsleep() implementation to take the reality of the timer
wheel granularity on different HZ values into account. Right now the
boundaries are hard coded time ranges which fail to provide the
requested accuracy on different HZ settings.
* Update documentation for all sleep/timeout related functions and fix
up stale documentation links all over the place
* Fixup a few usage sites
- Rework of timekeeping and adjtimex(2) to prepare for multiple PTP clocks
A system can have multiple PTP clocks which are participating in
seperate and independent PTP clock domains. So far the kernel only
considers the PTP clock which is based on CLOCK TAI relevant as that's
the clock which drives the timekeeping adjustments via the various user
space daemons through adjtimex(2).
The non TAI based clock domains are accessible via the file descriptor
based posix clocks, but their usability is very limited. They can't be
accessed fast as they always go all the way out to the hardware and
they cannot be utilized in the kernel itself.
As Time Sensitive Networking (TSN) gains traction it is required to
provide fast user and kernel space access to these clocks.
The approach taken is to utilize the timekeeping and adjtimex(2)
infrastructure to provide this access in a similar way how the kernel
provides access to clock MONOTONIC, REALTIME etc.
Instead of creating a duplicated infrastructure this rework converts
timekeeping and adjtimex(2) into generic functionality which operates
on pointers to data structures instead of using static variables.
This allows to provide time accessors and adjtimex(2) functionality for
the independent PTP clocks in a subsequent step.
- Consolidate hrtimer initialization
hrtimers are set up by initializing the data structure and then
seperately setting the callback function for historical reasons.
That's an extra unnecessary step and makes Rust support less straight
forward than it should be.
Provide a new set of hrtimer_setup*() functions and convert the core
code and a few usage sites of the less frequently used interfaces over.
The bulk of the htimer_init() to hrtimer_setup() conversion is already
prepared and scheduled for the next merge window.
- Drivers:
* Ensure that the global timekeeping clocksource is utilizing the
cluster 0 timer on MIPS multi-cluster systems.
Otherwise CPUs on different clusters use their cluster specific
clocksource which is not guaranteed to be synchronized with other
clusters.
* Mostly boring cleanups, fixes, improvements and code movement
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Merge tag 'timers-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull timer updates from Thomas Gleixner:
"A rather large update for timekeeping and timers:
- The final step to get rid of auto-rearming posix-timers
posix-timers are currently auto-rearmed by the kernel when the
signal of the timer is ignored so that the timer signal can be
delivered once the corresponding signal is unignored.
This requires to throttle the timer to prevent a DoS by small
intervals and keeps the system pointlessly out of low power states
for no value. This is a long standing non-trivial problem due to
the lock order of posix-timer lock and the sighand lock along with
life time issues as the timer and the sigqueue have different life
time rules.
Cure this by:
- Embedding the sigqueue into the timer struct to have the same
life time rules. Aside of that this also avoids the lookup of
the timer in the signal delivery and rearm path as it's just a
always valid container_of() now.
- Queuing ignored timer signals onto a seperate ignored list.
- Moving queued timer signals onto the ignored list when the
signal is switched to SIG_IGN before it could be delivered.
- Walking the ignored list when SIG_IGN is lifted and requeue the
signals to the actual signal lists. This allows the signal
delivery code to rearm the timer.
This also required to consolidate the signal delivery rules so they
are consistent across all situations. With that all self test
scenarios finally succeed.
- Core infrastructure for VFS multigrain timestamping
This is required to allow the kernel to use coarse grained time
stamps by default and switch to fine grained time stamps when inode
attributes are actively observed via getattr().
These changes have been provided to the VFS tree as well, so that
the VFS specific infrastructure could be built on top.
- Cleanup and consolidation of the sleep() infrastructure
- Move all sleep and timeout functions into one file
- Rework udelay() and ndelay() into proper documented inline
functions and replace the hardcoded magic numbers by proper
defines.
- Rework the fsleep() implementation to take the reality of the
timer wheel granularity on different HZ values into account.
Right now the boundaries are hard coded time ranges which fail
to provide the requested accuracy on different HZ settings.
- Update documentation for all sleep/timeout related functions
and fix up stale documentation links all over the place
- Fixup a few usage sites
- Rework of timekeeping and adjtimex(2) to prepare for multiple PTP
clocks
A system can have multiple PTP clocks which are participating in
seperate and independent PTP clock domains. So far the kernel only
considers the PTP clock which is based on CLOCK TAI relevant as
that's the clock which drives the timekeeping adjustments via the
various user space daemons through adjtimex(2).
The non TAI based clock domains are accessible via the file
descriptor based posix clocks, but their usability is very limited.
They can't be accessed fast as they always go all the way out to
the hardware and they cannot be utilized in the kernel itself.
As Time Sensitive Networking (TSN) gains traction it is required to
provide fast user and kernel space access to these clocks.
The approach taken is to utilize the timekeeping and adjtimex(2)
infrastructure to provide this access in a similar way how the
kernel provides access to clock MONOTONIC, REALTIME etc.
Instead of creating a duplicated infrastructure this rework
converts timekeeping and adjtimex(2) into generic functionality
which operates on pointers to data structures instead of using
static variables.
This allows to provide time accessors and adjtimex(2) functionality
for the independent PTP clocks in a subsequent step.
- Consolidate hrtimer initialization
hrtimers are set up by initializing the data structure and then
seperately setting the callback function for historical reasons.
That's an extra unnecessary step and makes Rust support less
straight forward than it should be.
Provide a new set of hrtimer_setup*() functions and convert the
core code and a few usage sites of the less frequently used
interfaces over.
The bulk of the htimer_init() to hrtimer_setup() conversion is
already prepared and scheduled for the next merge window.
- Drivers:
- Ensure that the global timekeeping clocksource is utilizing the
cluster 0 timer on MIPS multi-cluster systems.
Otherwise CPUs on different clusters use their cluster specific
clocksource which is not guaranteed to be synchronized with
other clusters.
- Mostly boring cleanups, fixes, improvements and code movement"
* tag 'timers-core-2024-11-18' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (140 commits)
posix-timers: Fix spurious warning on double enqueue versus do_exit()
clocksource/drivers/arm_arch_timer: Use of_property_present() for non-boolean properties
clocksource/drivers/gpx: Remove redundant casts
clocksource/drivers/timer-ti-dm: Fix child node refcount handling
dt-bindings: timer: actions,owl-timer: convert to YAML
clocksource/drivers/ralink: Add Ralink System Tick Counter driver
clocksource/drivers/mips-gic-timer: Always use cluster 0 counter as clocksource
clocksource/drivers/timer-ti-dm: Don't fail probe if int not found
clocksource/drivers:sp804: Make user selectable
clocksource/drivers/dw_apb: Remove unused dw_apb_clockevent functions
hrtimers: Delete hrtimer_init_on_stack()
alarmtimer: Switch to use hrtimer_setup() and hrtimer_setup_on_stack()
io_uring: Switch to use hrtimer_setup_on_stack()
sched/idle: Switch to use hrtimer_setup_on_stack()
hrtimers: Delete hrtimer_init_sleeper_on_stack()
wait: Switch to use hrtimer_setup_sleeper_on_stack()
timers: Switch to use hrtimer_setup_sleeper_on_stack()
net: pktgen: Switch to use hrtimer_setup_sleeper_on_stack()
futex: Switch to use hrtimer_setup_sleeper_on_stack()
fs/aio: Switch to use hrtimer_setup_sleeper_on_stack()
...
3086 lines
101 KiB
Plaintext
3086 lines
101 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menu "Kernel hacking"
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menu "printk and dmesg options"
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|
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config PRINTK_TIME
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bool "Show timing information on printks"
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|
depends on PRINTK
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help
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|
Selecting this option causes time stamps of the printk()
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messages to be added to the output of the syslog() system
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call and at the console.
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The timestamp is always recorded internally, and exported
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to /dev/kmsg. This flag just specifies if the timestamp should
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be included, not that the timestamp is recorded.
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The behavior is also controlled by the kernel command line
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parameter printk.time=1. See Documentation/admin-guide/kernel-parameters.rst
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config PRINTK_CALLER
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bool "Show caller information on printks"
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depends on PRINTK
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help
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Selecting this option causes printk() to add a caller "thread id" (if
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in task context) or a caller "processor id" (if not in task context)
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to every message.
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This option is intended for environments where multiple threads
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concurrently call printk() for many times, for it is difficult to
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interpret without knowing where these lines (or sometimes individual
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line which was divided into multiple lines due to race) came from.
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Since toggling after boot makes the code racy, currently there is
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no option to enable/disable at the kernel command line parameter or
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sysfs interface.
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config STACKTRACE_BUILD_ID
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bool "Show build ID information in stacktraces"
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depends on PRINTK
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help
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Selecting this option adds build ID information for symbols in
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stacktraces printed with the printk format '%p[SR]b'.
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This option is intended for distros where debuginfo is not easily
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accessible but can be downloaded given the build ID of the vmlinux or
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kernel module where the function is located.
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config CONSOLE_LOGLEVEL_DEFAULT
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int "Default console loglevel (1-15)"
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range 1 15
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default "7"
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help
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Default loglevel to determine what will be printed on the console.
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Setting a default here is equivalent to passing in loglevel=<x> in
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the kernel bootargs. loglevel=<x> continues to override whatever
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value is specified here as well.
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Note: This does not affect the log level of un-prefixed printk()
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usage in the kernel. That is controlled by the MESSAGE_LOGLEVEL_DEFAULT
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option.
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config CONSOLE_LOGLEVEL_QUIET
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int "quiet console loglevel (1-15)"
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range 1 15
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default "4"
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help
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loglevel to use when "quiet" is passed on the kernel commandline.
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When "quiet" is passed on the kernel commandline this loglevel
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will be used as the loglevel. IOW passing "quiet" will be the
|
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equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"
|
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|
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config MESSAGE_LOGLEVEL_DEFAULT
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int "Default message log level (1-7)"
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range 1 7
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default "4"
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help
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Default log level for printk statements with no specified priority.
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|
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This was hard-coded to KERN_WARNING since at least 2.6.10 but folks
|
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that are auditing their logs closely may want to set it to a lower
|
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priority.
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|
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Note: This does not affect what message level gets printed on the console
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by default. To change that, use loglevel=<x> in the kernel bootargs,
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or pick a different CONSOLE_LOGLEVEL_DEFAULT configuration value.
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|
|
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config BOOT_PRINTK_DELAY
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bool "Delay each boot printk message by N milliseconds"
|
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depends on DEBUG_KERNEL && PRINTK && GENERIC_CALIBRATE_DELAY
|
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help
|
|
This build option allows you to read kernel boot messages
|
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by inserting a short delay after each one. The delay is
|
|
specified in milliseconds on the kernel command line,
|
|
using "boot_delay=N".
|
|
|
|
It is likely that you would also need to use "lpj=M" to preset
|
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the "loops per jiffy" value.
|
|
See a previous boot log for the "lpj" value to use for your
|
|
system, and then set "lpj=M" before setting "boot_delay=N".
|
|
NOTE: Using this option may adversely affect SMP systems.
|
|
I.e., processors other than the first one may not boot up.
|
|
BOOT_PRINTK_DELAY also may cause LOCKUP_DETECTOR to detect
|
|
what it believes to be lockup conditions.
|
|
|
|
config DYNAMIC_DEBUG
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|
bool "Enable dynamic printk() support"
|
|
default n
|
|
depends on PRINTK
|
|
depends on (DEBUG_FS || PROC_FS)
|
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select DYNAMIC_DEBUG_CORE
|
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help
|
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|
|
Compiles debug level messages into the kernel, which would not
|
|
otherwise be available at runtime. These messages can then be
|
|
enabled/disabled based on various levels of scope - per source file,
|
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function, module, format string, and line number. This mechanism
|
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implicitly compiles in all pr_debug() and dev_dbg() calls, which
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enlarges the kernel text size by about 2%.
|
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|
|
If a source file is compiled with DEBUG flag set, any
|
|
pr_debug() calls in it are enabled by default, but can be
|
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disabled at runtime as below. Note that DEBUG flag is
|
|
turned on by many CONFIG_*DEBUG* options.
|
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|
|
Usage:
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|
|
Dynamic debugging is controlled via the 'dynamic_debug/control' file,
|
|
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
|
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file contains a list of the debug statements that can be enabled. The
|
|
format for each line of the file is:
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filename:lineno [module]function flags format
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|
|
filename : source file of the debug statement
|
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lineno : line number of the debug statement
|
|
module : module that contains the debug statement
|
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function : function that contains the debug statement
|
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flags : '=p' means the line is turned 'on' for printing
|
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format : the format used for the debug statement
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|
|
|
From a live system:
|
|
|
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nullarbor:~ # cat <debugfs>/dynamic_debug/control
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# filename:lineno [module]function flags format
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fs/aio.c:222 [aio]__put_ioctx =_ "__put_ioctx:\040freeing\040%p\012"
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fs/aio.c:248 [aio]ioctx_alloc =_ "ENOMEM:\040nr_events\040too\040high\012"
|
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fs/aio.c:1770 [aio]sys_io_cancel =_ "calling\040cancel\012"
|
|
|
|
Example usage:
|
|
|
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// enable the message at line 1603 of file svcsock.c
|
|
nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
|
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<debugfs>/dynamic_debug/control
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|
|
|
// enable all the messages in file svcsock.c
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nullarbor:~ # echo -n 'file svcsock.c +p' >
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<debugfs>/dynamic_debug/control
|
|
|
|
// enable all the messages in the NFS server module
|
|
nullarbor:~ # echo -n 'module nfsd +p' >
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<debugfs>/dynamic_debug/control
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|
|
|
// enable all 12 messages in the function svc_process()
|
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nullarbor:~ # echo -n 'func svc_process +p' >
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<debugfs>/dynamic_debug/control
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|
|
// disable all 12 messages in the function svc_process()
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nullarbor:~ # echo -n 'func svc_process -p' >
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<debugfs>/dynamic_debug/control
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|
|
|
See Documentation/admin-guide/dynamic-debug-howto.rst for additional
|
|
information.
|
|
|
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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
|
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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
|
|
help
|
|
If you say Y here, the kernel's printf implementation will
|
|
be able to print symbolic error names such as ENOSPC instead
|
|
of the number 28. It makes the kernel image slightly larger
|
|
(about 3KB), but can make the kernel logs easier to read.
|
|
|
|
config DEBUG_BUGVERBOSE
|
|
bool "Verbose BUG() reporting (adds 70K)" if DEBUG_KERNEL && EXPERT
|
|
depends on BUG && (GENERIC_BUG || HAVE_DEBUG_BUGVERBOSE)
|
|
default y
|
|
help
|
|
Say Y here to make BUG() panics output the file name and line number
|
|
of the BUG call as well as the EIP and oops trace. This aids
|
|
debugging but costs about 70-100K of memory.
|
|
|
|
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
|
|
help
|
|
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 generates .uleb128 with label differences for DWARF v5, a feature that
|
|
# older binutils ports do not support when utilizing RISC-V style linker
|
|
# relaxation: https://sourceware.org/bugzilla/show_bug.cgi?id=27215
|
|
config AS_HAS_NON_CONST_ULEB128
|
|
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.
|
|
|
|
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_ULEB128)
|
|
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 !ARCH_HAS_BROKEN_DWARF5
|
|
depends on !CC_IS_CLANG || AS_IS_LLVM || (AS_IS_GNU && AS_VERSION >= 23502 && AS_HAS_NON_CONST_ULEB128)
|
|
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"
|
|
help
|
|
If you say Y here gcc is instructed to generate less debugging
|
|
information for structure types. This means that tools that
|
|
need full debugging information (like kgdb or systemtap) won't
|
|
be happy. But if you merely need debugging information to
|
|
resolve line numbers there is no loss. Advantage is that
|
|
build directory object sizes shrink dramatically over a full
|
|
DEBUG_INFO build and compile times are reduced too.
|
|
Only works with newer gcc versions.
|
|
|
|
choice
|
|
prompt "Compressed Debug information"
|
|
help
|
|
Compress the resulting debug info. Results in smaller debug info sections,
|
|
but requires that consumers are able to decompress the results.
|
|
|
|
If unsure, choose DEBUG_INFO_COMPRESSED_NONE.
|
|
|
|
config DEBUG_INFO_COMPRESSED_NONE
|
|
bool "Don't compress debug information"
|
|
help
|
|
Don't compress debug info sections.
|
|
|
|
config DEBUG_INFO_COMPRESSED_ZLIB
|
|
bool "Compress debugging information with zlib"
|
|
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_COMPRESSED_ZSTD
|
|
bool "Compress debugging information with zstd"
|
|
depends on $(cc-option,-gz=zstd)
|
|
depends on $(ld-option,--compress-debug-sections=zstd)
|
|
help
|
|
Compress the debug information using zstd. This may provide better
|
|
compression than zlib, for about the same time costs, but requires newer
|
|
toolchain support. Requires GCC 13.0+ or Clang 16.0+, binutils 2.40+, and
|
|
zstd.
|
|
|
|
endchoice # "Compressed Debug information"
|
|
|
|
config DEBUG_INFO_SPLIT
|
|
bool "Produce split debuginfo in .dwo files"
|
|
depends on $(cc-option,-gsplit-dwarf)
|
|
# RISC-V linker relaxation + -gsplit-dwarf has issues with LLVM and GCC
|
|
# prior to 12.x:
|
|
# https://github.com/llvm/llvm-project/issues/56642
|
|
# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99090
|
|
depends on !RISCV || GCC_VERSION >= 120000
|
|
help
|
|
Generate debug info into separate .dwo files. This significantly
|
|
reduces the build directory size for builds with DEBUG_INFO,
|
|
because it stores the information only once on disk in .dwo
|
|
files instead of multiple times in object files and executables.
|
|
In addition the debug information is also compressed.
|
|
|
|
Requires recent gcc (4.7+) and recent gdb/binutils.
|
|
Any tool that packages or reads debug information would need
|
|
to know about the .dwo files and include them.
|
|
Incompatible with older versions of ccache.
|
|
|
|
config DEBUG_INFO_BTF
|
|
bool "Generate BTF type information"
|
|
depends on !DEBUG_INFO_SPLIT && !DEBUG_INFO_REDUCED
|
|
depends on !GCC_PLUGIN_RANDSTRUCT || COMPILE_TEST
|
|
depends on BPF_SYSCALL
|
|
depends on PAHOLE_VERSION >= 116
|
|
depends on DEBUG_INFO_DWARF4 || PAHOLE_VERSION >= 121
|
|
# pahole uses elfutils, which does not have support for Hexagon relocations
|
|
depends on !HEXAGON
|
|
help
|
|
Generate deduplicated BTF type information from DWARF debug info.
|
|
Turning this on requires pahole v1.16 or later (v1.21 or later to
|
|
support DWARF 5), 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 PAHOLE_HAS_LANG_EXCLUDE
|
|
def_bool PAHOLE_VERSION >= 124
|
|
help
|
|
Support for the --lang_exclude flag which makes pahole exclude
|
|
compilation units from the supplied language. Used in Kbuild to
|
|
omit Rust CUs which are not supported in version 1.24 of pahole,
|
|
otherwise it would emit malformed kernel and module binaries when
|
|
using DEBUG_INFO_BTF_MODULES.
|
|
|
|
config DEBUG_INFO_BTF_MODULES
|
|
bool "Generate BTF type information for kernel modules"
|
|
default 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"
|
|
help
|
|
This creates the required links to GDB helper scripts in the
|
|
build directory. If you load vmlinux into gdb, the helper
|
|
scripts will be automatically imported by gdb as well, and
|
|
additional functions are available to analyze a Linux kernel
|
|
instance. See Documentation/dev-tools/gdb-kernel-debugging.rst
|
|
for further details.
|
|
|
|
endif # DEBUG_INFO
|
|
|
|
config FRAME_WARN
|
|
int "Warn for stack frames larger than"
|
|
range 0 8192
|
|
default 0 if KMSAN
|
|
default 2048 if GCC_PLUGIN_LATENT_ENTROPY
|
|
default 2048 if PARISC
|
|
default 1536 if (!64BIT && XTENSA)
|
|
default 1280 if KASAN && !64BIT
|
|
default 1024 if !64BIT
|
|
default 2048 if 64BIT
|
|
help
|
|
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.
|
|
|
|
config STRIP_ASM_SYMS
|
|
bool "Strip assembler-generated symbols during link"
|
|
default n
|
|
help
|
|
Strip internal assembler-generated symbols during a link (symbols
|
|
that look like '.Lxxx') so they don't pollute the output of
|
|
get_wchan() and suchlike.
|
|
|
|
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
|
|
to keep kernel developers who have to stare a lot at assembler listings
|
|
sane.
|
|
|
|
config HEADERS_INSTALL
|
|
bool "Install uapi headers to usr/include"
|
|
depends on !UML
|
|
help
|
|
This option will install uapi headers (headers exported to user-space)
|
|
into the usr/include directory for use during the kernel build.
|
|
This is unneeded for building the kernel itself, but needed for some
|
|
user-space program samples. It is also needed by some features such
|
|
as uapi header sanity checks.
|
|
|
|
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.
|
|
During linktime or runtime, some sections are dropped;
|
|
any use of code/data previously in these sections would
|
|
most likely result in an oops.
|
|
In the code, functions and variables are annotated with
|
|
__init,, etc. (see the full list in include/linux/init.h),
|
|
which results in the code/data being placed in specific sections.
|
|
The section mismatch analysis is always performed after a full
|
|
kernel build, and enabling this option causes the following
|
|
additional step to occur:
|
|
- Add the option -fno-inline-functions-called-once to gcc commands.
|
|
When inlining a function annotated with __init in a non-init
|
|
function, we would lose the section information and thus
|
|
the analysis would not catch the illegal reference.
|
|
This option tells gcc to inline less (but it does result in
|
|
a larger kernel).
|
|
|
|
config SECTION_MISMATCH_WARN_ONLY
|
|
bool "Make section mismatch errors non-fatal"
|
|
default y
|
|
help
|
|
If you say N here, the build process will fail if there are any
|
|
section mismatch, instead of just throwing warnings.
|
|
|
|
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 || RISCV || S390)
|
|
select FUNCTION_ALIGNMENT_64B
|
|
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
|
|
# option on the architecture (regardless of KERNEL_DEBUG):
|
|
#
|
|
config ARCH_WANT_FRAME_POINTERS
|
|
bool
|
|
|
|
config FRAME_POINTER
|
|
bool "Compile the kernel with frame pointers"
|
|
depends on DEBUG_KERNEL && (M68K || UML || SUPERH) || ARCH_WANT_FRAME_POINTERS
|
|
default y if (DEBUG_INFO && UML) || ARCH_WANT_FRAME_POINTERS
|
|
help
|
|
If you say Y here the resulting kernel image will be slightly
|
|
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 && UNWINDER_FRAME_POINTER
|
|
select OBJTOOL
|
|
default n
|
|
help
|
|
Validate frame pointer rules at compile-time. This helps ensure that
|
|
runtime stack traces are more reliable.
|
|
|
|
For more information, see
|
|
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 BUILTIN_MODULE_RANGES
|
|
bool "Generate address range information for builtin modules"
|
|
depends on !LTO
|
|
depends on VMLINUX_MAP
|
|
help
|
|
When modules are built into the kernel, there will be no module name
|
|
associated with its symbols in /proc/kallsyms. Tracers may want to
|
|
identify symbols by module name and symbol name regardless of whether
|
|
the module is configured as loadable or not.
|
|
|
|
This option generates modules.builtin.ranges in the build tree with
|
|
offset ranges (per ELF section) for the module(s) they belong to.
|
|
It also records an anchor symbol to determine the load address of the
|
|
section.
|
|
|
|
config DEBUG_FORCE_WEAK_PER_CPU
|
|
bool "Force weak per-cpu definitions"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
s390 and alpha require percpu variables in modules to be
|
|
defined weak to work around addressing range issue which
|
|
puts the following two restrictions on percpu variable
|
|
definitions.
|
|
|
|
1. percpu symbols must be unique whether static or not
|
|
2. percpu variables can't be defined inside a function
|
|
|
|
To ensure that generic code follows the above rules, this
|
|
option forces all percpu variables to be defined as weak.
|
|
|
|
endmenu # "Compiler options"
|
|
|
|
menu "Generic Kernel Debugging Instruments"
|
|
|
|
config MAGIC_SYSRQ
|
|
bool "Magic SysRq key"
|
|
depends on !UML
|
|
help
|
|
If you say Y here, you will have some control over the system even
|
|
if the system crashes for example during kernel debugging (e.g., you
|
|
will be able to flush the buffer cache to disk, reboot the system
|
|
immediately or dump some status information). This is accomplished
|
|
by pressing various keys while holding SysRq (Alt+PrintScreen). It
|
|
also works on a serial console (on PC hardware at least), if you
|
|
send a BREAK and then within 5 seconds a command keypress. The
|
|
keys are documented in <file:Documentation/admin-guide/sysrq.rst>.
|
|
Don't say Y unless you really know what this hack does.
|
|
|
|
config MAGIC_SYSRQ_DEFAULT_ENABLE
|
|
hex "Enable magic SysRq key functions by default"
|
|
depends on MAGIC_SYSRQ
|
|
default 0x1
|
|
help
|
|
Specifies which SysRq key functions are enabled by default.
|
|
This may be set to 1 or 0 to enable or disable them all, or
|
|
to a bitmask as described in Documentation/admin-guide/sysrq.rst.
|
|
|
|
config MAGIC_SYSRQ_SERIAL
|
|
bool "Enable magic SysRq key over serial"
|
|
depends on MAGIC_SYSRQ
|
|
default y
|
|
help
|
|
Many embedded boards have a disconnected TTL level serial which can
|
|
generate some garbage that can lead to spurious false sysrq detects.
|
|
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
|
|
debugfs is a virtual file system that kernel developers use to put
|
|
debugging files into. Enable this option to be able to read and
|
|
write to these files.
|
|
|
|
For detailed documentation on the debugfs API, see
|
|
Documentation/filesystems/.
|
|
|
|
If unsure, say N.
|
|
|
|
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
|
|
|
|
menu "Networking Debugging"
|
|
|
|
source "net/Kconfig.debug"
|
|
|
|
endmenu # "Networking Debugging"
|
|
|
|
menu "Memory Debugging"
|
|
|
|
source "mm/Kconfig.debug"
|
|
|
|
config DEBUG_OBJECTS
|
|
bool "Debug object operations"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
kernel to track the life time of various objects and validate
|
|
the operations on those objects.
|
|
|
|
config DEBUG_OBJECTS_SELFTEST
|
|
bool "Debug objects selftest"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
This enables the selftest of the object debug code.
|
|
|
|
config DEBUG_OBJECTS_FREE
|
|
bool "Debug objects in freed memory"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
This enables checks whether a k/v free operation frees an area
|
|
which contains an object which has not been deactivated
|
|
properly. This can make kmalloc/kfree-intensive workloads
|
|
much slower.
|
|
|
|
config DEBUG_OBJECTS_TIMERS
|
|
bool "Debug timer objects"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
timer routines to track the life time of timer objects and
|
|
validate the timer operations.
|
|
|
|
config DEBUG_OBJECTS_WORK
|
|
bool "Debug work objects"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
work queue routines to track the life time of work objects and
|
|
validate the work operations.
|
|
|
|
config DEBUG_OBJECTS_RCU_HEAD
|
|
bool "Debug RCU callbacks objects"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
Enable this to turn on debugging of RCU list heads (call_rcu() usage).
|
|
|
|
config DEBUG_OBJECTS_PERCPU_COUNTER
|
|
bool "Debug percpu counter objects"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
percpu counter routines to track the life time of percpu counter
|
|
objects and validate the percpu counter operations.
|
|
|
|
config DEBUG_OBJECTS_ENABLE_DEFAULT
|
|
int "debug_objects bootup default value (0-1)"
|
|
range 0 1
|
|
default "1"
|
|
depends on DEBUG_OBJECTS
|
|
help
|
|
Debug objects boot parameter default value
|
|
|
|
config SHRINKER_DEBUG
|
|
bool "Enable shrinker debugging support"
|
|
depends on DEBUG_FS
|
|
help
|
|
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 DEBUG_STACK_USAGE
|
|
bool "Stack utilization instrumentation"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Enables the display of the minimum amount of free stack which each
|
|
task has ever had available in the sysrq-T and sysrq-P debug output.
|
|
Also emits a message to dmesg when a process exits if that process
|
|
used more stack space than previously exiting processes.
|
|
|
|
This option will slow down process creation somewhat.
|
|
|
|
config SCHED_STACK_END_CHECK
|
|
bool "Detect stack corruption on calls to schedule()"
|
|
depends on DEBUG_KERNEL
|
|
default n
|
|
help
|
|
This option checks for a stack overrun on calls to schedule().
|
|
If the stack end location is found to be over written always panic as
|
|
the content of the corrupted region can no longer be trusted.
|
|
This is to ensure no erroneous behaviour occurs which could result in
|
|
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
|
|
help
|
|
Enable this to turn on extended checks in the virtual-memory system
|
|
that may impact performance.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_VM_SHOOT_LAZIES
|
|
bool "Debug MMU_LAZY_TLB_SHOOTDOWN implementation"
|
|
depends on DEBUG_VM
|
|
depends on MMU_LAZY_TLB_SHOOTDOWN
|
|
help
|
|
Enable additional IPIs that ensure lazy tlb mm references are removed
|
|
before the mm is freed.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_VM_MAPLE_TREE
|
|
bool "Debug VM maple trees"
|
|
depends on DEBUG_VM
|
|
select DEBUG_MAPLE_TREE
|
|
help
|
|
Enable VM maple tree debugging information and extra validations.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_VM_RB
|
|
bool "Debug VM red-black trees"
|
|
depends on DEBUG_VM
|
|
help
|
|
Enable VM red-black tree debugging information and extra validations.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_VM_PGFLAGS
|
|
bool "Debug page-flags operations"
|
|
depends on DEBUG_VM
|
|
help
|
|
Enables extra validation on page flags operations.
|
|
|
|
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
|
|
|
|
config DEBUG_VIRTUAL
|
|
bool "Debug VM translations"
|
|
depends on DEBUG_KERNEL && ARCH_HAS_DEBUG_VIRTUAL
|
|
help
|
|
Enable some costly sanity checks in virtual to page code. This can
|
|
catch mistakes with virt_to_page() and friends.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_NOMMU_REGIONS
|
|
bool "Debug the global anon/private NOMMU mapping region tree"
|
|
depends on DEBUG_KERNEL && !MMU
|
|
help
|
|
This option causes the global tree of anonymous and private mapping
|
|
regions to be regularly checked for invalid topology.
|
|
|
|
config DEBUG_MEMORY_INIT
|
|
bool "Debug memory initialisation" if EXPERT
|
|
default !EXPERT
|
|
help
|
|
Enable this for additional checks during memory initialisation.
|
|
The sanity checks verify aspects of the VM such as the memory model
|
|
and other information provided by the architecture. Verbose
|
|
information will be printed at KERN_DEBUG loglevel depending
|
|
on the mminit_loglevel= command-line option.
|
|
|
|
If unsure, say Y
|
|
|
|
config MEMORY_NOTIFIER_ERROR_INJECT
|
|
tristate "Memory hotplug notifier error injection module"
|
|
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
|
|
debugfs interface under /sys/kernel/debug/notifier-error-inject/memory
|
|
|
|
If the notifier call chain should be failed with some events
|
|
notified, write the error code to "actions/<notifier event>/error".
|
|
|
|
Example: Inject memory hotplug offline error (-12 == -ENOMEM)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/memory
|
|
# echo -12 > actions/MEM_GOING_OFFLINE/error
|
|
# echo offline > /sys/devices/system/memory/memoryXXX/state
|
|
bash: echo: write error: Cannot allocate memory
|
|
|
|
To compile this code as a module, choose M here: the module will
|
|
be called memory-notifier-error-inject.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_PER_CPU_MAPS
|
|
bool "Debug access to per_cpu maps"
|
|
depends on DEBUG_KERNEL
|
|
depends on SMP
|
|
help
|
|
Say Y to verify that the per_cpu map being accessed has
|
|
been set up. This adds a fair amount of code to kernel memory
|
|
and decreases performance.
|
|
|
|
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.
|
|
|
|
config HAVE_DEBUG_STACKOVERFLOW
|
|
bool
|
|
|
|
config DEBUG_STACKOVERFLOW
|
|
bool "Check for stack overflows"
|
|
depends on DEBUG_KERNEL && HAVE_DEBUG_STACKOVERFLOW
|
|
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
|
|
below a certain limit.
|
|
|
|
These kinds of bugs usually occur when call-chains in the
|
|
kernel get too deep, especially when interrupts are
|
|
involved.
|
|
|
|
Use this in cases where you see apparently random memory
|
|
corruption, especially if it appears in 'struct thread_info'
|
|
|
|
If in doubt, say "N".
|
|
|
|
config CODE_TAGGING
|
|
bool
|
|
select KALLSYMS
|
|
|
|
config MEM_ALLOC_PROFILING
|
|
bool "Enable memory allocation profiling"
|
|
default n
|
|
depends on PROC_FS
|
|
depends on !DEBUG_FORCE_WEAK_PER_CPU
|
|
select CODE_TAGGING
|
|
select PAGE_EXTENSION
|
|
select SLAB_OBJ_EXT
|
|
help
|
|
Track allocation source code and record total allocation size
|
|
initiated at that code location. The mechanism can be used to track
|
|
memory leaks with a low performance and memory impact.
|
|
|
|
config MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
|
|
bool "Enable memory allocation profiling by default"
|
|
default y
|
|
depends on MEM_ALLOC_PROFILING
|
|
|
|
config MEM_ALLOC_PROFILING_DEBUG
|
|
bool "Memory allocation profiler debugging"
|
|
default n
|
|
depends on MEM_ALLOC_PROFILING
|
|
select MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
|
|
help
|
|
Adds warnings with helpful error messages for memory allocation
|
|
profiling.
|
|
|
|
source "lib/Kconfig.kasan"
|
|
source "lib/Kconfig.kfence"
|
|
source "lib/Kconfig.kmsan"
|
|
|
|
endmenu # "Memory Debugging"
|
|
|
|
config DEBUG_SHIRQ
|
|
bool "Debug shared IRQ handlers"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
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"
|
|
|
|
config PANIC_ON_OOPS
|
|
bool "Panic on Oops"
|
|
help
|
|
Say Y here to enable the kernel to panic when it oopses. This
|
|
has the same effect as setting oops=panic on the kernel command
|
|
line.
|
|
|
|
This feature is useful to ensure that the kernel does not do
|
|
anything erroneous after an oops which could result in data
|
|
corruption or other issues.
|
|
|
|
Say N if unsure.
|
|
|
|
config PANIC_ON_OOPS_VALUE
|
|
int
|
|
range 0 1
|
|
default 0 if !PANIC_ON_OOPS
|
|
default 1 if PANIC_ON_OOPS
|
|
|
|
config PANIC_TIMEOUT
|
|
int "panic timeout"
|
|
default 0
|
|
help
|
|
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. This setting can be overridden
|
|
with the kernel command line option panic=, and from userspace via
|
|
/proc/sys/kernel/panic.
|
|
|
|
config LOCKUP_DETECTOR
|
|
bool
|
|
|
|
config SOFTLOCKUP_DETECTOR
|
|
bool "Detect Soft Lockups"
|
|
depends on DEBUG_KERNEL && !S390
|
|
select LOCKUP_DETECTOR
|
|
help
|
|
Say Y here to enable the kernel to act as a watchdog to detect
|
|
soft lockups.
|
|
|
|
Softlockups are bugs that cause the kernel to loop in kernel
|
|
mode for more than 20 seconds, without giving other tasks a
|
|
chance to run. The current stack trace is displayed upon
|
|
detection and the system will stay locked up.
|
|
|
|
config SOFTLOCKUP_DETECTOR_INTR_STORM
|
|
bool "Detect Interrupt Storm in Soft Lockups"
|
|
depends on SOFTLOCKUP_DETECTOR && IRQ_TIME_ACCOUNTING
|
|
select GENERIC_IRQ_STAT_SNAPSHOT
|
|
default y if NR_CPUS <= 128
|
|
help
|
|
Say Y here to enable the kernel to detect interrupt storm
|
|
during "soft lockups".
|
|
|
|
"soft lockups" can be caused by a variety of reasons. If one is
|
|
caused by an interrupt storm, then the storming interrupts will not
|
|
be on the callstack. To detect this case, it is necessary to report
|
|
the CPU stats and the interrupt counts during the "soft lockups".
|
|
|
|
config BOOTPARAM_SOFTLOCKUP_PANIC
|
|
bool "Panic (Reboot) On Soft Lockups"
|
|
depends on SOFTLOCKUP_DETECTOR
|
|
help
|
|
Say Y here to enable the kernel to panic on "soft lockups",
|
|
which are bugs that cause the kernel to loop in kernel
|
|
mode for more than 20 seconds (configurable using the watchdog_thresh
|
|
sysctl), without giving other tasks a chance to run.
|
|
|
|
The panic can be used in combination with panic_timeout,
|
|
to cause the system to reboot automatically after a
|
|
lockup has been detected. This feature is useful for
|
|
high-availability systems that have uptime guarantees and
|
|
where a lockup must be resolved ASAP.
|
|
|
|
Say N if unsure.
|
|
|
|
config HAVE_HARDLOCKUP_DETECTOR_BUDDY
|
|
bool
|
|
depends on SMP
|
|
default y
|
|
|
|
#
|
|
# Global switch whether to build a hardlockup detector at all. It is available
|
|
# only when the architecture supports at least one implementation. There are
|
|
# two exceptions. The hardlockup detector is never enabled on:
|
|
#
|
|
# s390: it reported many false positives there
|
|
#
|
|
# sparc64: has a custom implementation which is not using the common
|
|
# hardlockup command line options and sysctl interface.
|
|
#
|
|
config HARDLOCKUP_DETECTOR
|
|
bool "Detect Hard Lockups"
|
|
depends on DEBUG_KERNEL && !S390 && !HARDLOCKUP_DETECTOR_SPARC64
|
|
depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY || HAVE_HARDLOCKUP_DETECTOR_ARCH
|
|
imply HARDLOCKUP_DETECTOR_PERF
|
|
imply HARDLOCKUP_DETECTOR_BUDDY
|
|
imply HARDLOCKUP_DETECTOR_ARCH
|
|
select LOCKUP_DETECTOR
|
|
|
|
help
|
|
Say Y here to enable the kernel to act as a watchdog to detect
|
|
hard lockups.
|
|
|
|
Hardlockups are bugs that cause the CPU to loop in kernel mode
|
|
for more than 10 seconds, without letting other interrupts have a
|
|
chance to run. The current stack trace is displayed upon detection
|
|
and the system will stay locked up.
|
|
|
|
#
|
|
# Note that arch-specific variants are always preferred.
|
|
#
|
|
config HARDLOCKUP_DETECTOR_PREFER_BUDDY
|
|
bool "Prefer the buddy CPU hardlockup detector"
|
|
depends on HARDLOCKUP_DETECTOR
|
|
depends on HAVE_HARDLOCKUP_DETECTOR_PERF && HAVE_HARDLOCKUP_DETECTOR_BUDDY
|
|
depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
|
|
help
|
|
Say Y here to prefer the buddy hardlockup detector over the perf one.
|
|
|
|
With the buddy detector, each CPU uses its softlockup hrtimer
|
|
to check that the next CPU is processing hrtimer interrupts by
|
|
verifying that a counter is increasing.
|
|
|
|
This hardlockup detector is useful on systems that don't have
|
|
an arch-specific hardlockup detector or if resources needed
|
|
for the hardlockup detector are better used for other things.
|
|
|
|
config HARDLOCKUP_DETECTOR_PERF
|
|
bool
|
|
depends on HARDLOCKUP_DETECTOR
|
|
depends on HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY
|
|
depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
|
|
select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
|
|
|
|
config HARDLOCKUP_DETECTOR_BUDDY
|
|
bool
|
|
depends on HARDLOCKUP_DETECTOR
|
|
depends on HAVE_HARDLOCKUP_DETECTOR_BUDDY
|
|
depends on !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY
|
|
depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
|
|
select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
|
|
|
|
config HARDLOCKUP_DETECTOR_ARCH
|
|
bool
|
|
depends on HARDLOCKUP_DETECTOR
|
|
depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
|
|
help
|
|
The arch-specific implementation of the hardlockup detector will
|
|
be used.
|
|
|
|
#
|
|
# Both the "perf" and "buddy" hardlockup detectors count hrtimer
|
|
# interrupts. This config enables functions managing this common code.
|
|
#
|
|
config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
|
|
bool
|
|
select SOFTLOCKUP_DETECTOR
|
|
|
|
#
|
|
# Enables a timestamp based low pass filter to compensate for perf based
|
|
# hard lockup detection which runs too fast due to turbo modes.
|
|
#
|
|
config HARDLOCKUP_CHECK_TIMESTAMP
|
|
bool
|
|
|
|
config BOOTPARAM_HARDLOCKUP_PANIC
|
|
bool "Panic (Reboot) On Hard Lockups"
|
|
depends on HARDLOCKUP_DETECTOR
|
|
help
|
|
Say Y here to enable the kernel to panic on "hard lockups",
|
|
which are bugs that cause the kernel to loop in kernel
|
|
mode with interrupts disabled for more than 10 seconds (configurable
|
|
using the watchdog_thresh sysctl).
|
|
|
|
Say N if unsure.
|
|
|
|
config DETECT_HUNG_TASK
|
|
bool "Detect Hung Tasks"
|
|
depends on DEBUG_KERNEL
|
|
default SOFTLOCKUP_DETECTOR
|
|
help
|
|
Say Y here to enable the kernel to detect "hung tasks",
|
|
which are bugs that cause the task to be stuck in
|
|
uninterruptible "D" state indefinitely.
|
|
|
|
When a hung task is detected, the kernel will print the
|
|
current stack trace (which you should report), but the
|
|
task will stay in uninterruptible state. If lockdep is
|
|
enabled then all held locks will also be reported. This
|
|
feature has negligible overhead.
|
|
|
|
config DEFAULT_HUNG_TASK_TIMEOUT
|
|
int "Default timeout for hung task detection (in seconds)"
|
|
depends on DETECT_HUNG_TASK
|
|
default 120
|
|
help
|
|
This option controls the default timeout (in seconds) used
|
|
to determine when a task has become non-responsive and should
|
|
be considered hung.
|
|
|
|
It can be adjusted at runtime via the kernel.hung_task_timeout_secs
|
|
sysctl or by writing a value to
|
|
/proc/sys/kernel/hung_task_timeout_secs.
|
|
|
|
A timeout of 0 disables the check. The default is two minutes.
|
|
Keeping the default should be fine in most cases.
|
|
|
|
config BOOTPARAM_HUNG_TASK_PANIC
|
|
bool "Panic (Reboot) On Hung Tasks"
|
|
depends on DETECT_HUNG_TASK
|
|
help
|
|
Say Y here to enable the kernel to panic on "hung tasks",
|
|
which are bugs that cause the kernel to leave a task stuck
|
|
in uninterruptible "D" state.
|
|
|
|
The panic can be used in combination with panic_timeout,
|
|
to cause the system to reboot automatically after a
|
|
hung task has been detected. This feature is useful for
|
|
high-availability systems that have uptime guarantees and
|
|
where a hung tasks must be resolved ASAP.
|
|
|
|
Say N if unsure.
|
|
|
|
config WQ_WATCHDOG
|
|
bool "Detect Workqueue Stalls"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here to enable stall detection on workqueues. If a
|
|
worker pool doesn't make forward progress on a pending work
|
|
item for over a given amount of time, 30s by default, a
|
|
warning message is printed along with dump of workqueue
|
|
state. This can be configured through kernel parameter
|
|
"workqueue.watchdog_thresh" and its sysfs counterpart.
|
|
|
|
config WQ_CPU_INTENSIVE_REPORT
|
|
bool "Report per-cpu work items which hog CPU for too long"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Say Y here to enable reporting of concurrency-managed per-cpu work
|
|
items that hog CPUs for longer than
|
|
workqueue.cpu_intensive_thresh_us. Workqueue automatically
|
|
detects and excludes them from concurrency management to prevent
|
|
them from stalling other per-cpu work items. Occassional
|
|
triggering may not necessarily indicate a problem. Repeated
|
|
triggering likely indicates that the work item should be switched
|
|
to use an unbound workqueue.
|
|
|
|
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"
|
|
|
|
config SCHED_DEBUG
|
|
bool "Collect scheduler debugging info"
|
|
depends on DEBUG_KERNEL && DEBUG_FS
|
|
default y
|
|
help
|
|
If you say Y here, the /sys/kernel/debug/sched file will be provided
|
|
that can help debug the scheduler. The runtime overhead of this
|
|
option is minimal.
|
|
|
|
config SCHED_INFO
|
|
bool
|
|
default n
|
|
|
|
config SCHEDSTATS
|
|
bool "Collect scheduler statistics"
|
|
depends on PROC_FS
|
|
select SCHED_INFO
|
|
help
|
|
If you say Y here, additional code will be inserted into the
|
|
scheduler and related routines to collect statistics about
|
|
scheduler behavior and provide them in /proc/schedstat. These
|
|
stats may be useful for both tuning and debugging the scheduler
|
|
If you aren't debugging the scheduler or trying to tune a specific
|
|
application, you can say N to avoid the very slight overhead
|
|
this adds.
|
|
|
|
endmenu
|
|
|
|
config DEBUG_PREEMPT
|
|
bool "Debug preemptible kernel"
|
|
depends on DEBUG_KERNEL && PREEMPTION && TRACE_IRQFLAGS_SUPPORT
|
|
help
|
|
If you say Y here then the kernel will use a debug variant of the
|
|
commonly used smp_processor_id() function and will print warnings
|
|
if kernel code uses it in a preemption-unsafe way. Also, the kernel
|
|
will detect preemption count underflows.
|
|
|
|
This option has potential to introduce high runtime overhead,
|
|
depending on workload as it triggers debugging routines for each
|
|
this_cpu operation. It should only be used for debugging purposes.
|
|
|
|
menu "Lock Debugging (spinlocks, mutexes, etc...)"
|
|
|
|
config LOCK_DEBUGGING_SUPPORT
|
|
bool
|
|
depends on TRACE_IRQFLAGS_SUPPORT && STACKTRACE_SUPPORT && LOCKDEP_SUPPORT
|
|
default y
|
|
|
|
config PROVE_LOCKING
|
|
bool "Lock debugging: prove locking correctness"
|
|
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
|
|
select LOCKDEP
|
|
select DEBUG_SPINLOCK
|
|
select DEBUG_MUTEXES if !PREEMPT_RT
|
|
select DEBUG_RT_MUTEXES if RT_MUTEXES
|
|
select DEBUG_RWSEMS if !PREEMPT_RT
|
|
select DEBUG_WW_MUTEX_SLOWPATH
|
|
select DEBUG_LOCK_ALLOC
|
|
select PREEMPT_COUNT if !ARCH_NO_PREEMPT
|
|
select TRACE_IRQFLAGS
|
|
default n
|
|
help
|
|
This feature enables the kernel to prove that all locking
|
|
that occurs in the kernel runtime is mathematically
|
|
correct: that under no circumstance could an arbitrary (and
|
|
not yet triggered) combination of observed locking
|
|
sequences (on an arbitrary number of CPUs, running an
|
|
arbitrary number of tasks and interrupt contexts) cause a
|
|
deadlock.
|
|
|
|
In short, this feature enables the kernel to report locking
|
|
related deadlocks before they actually occur.
|
|
|
|
The proof does not depend on how hard and complex a
|
|
deadlock scenario would be to trigger: how many
|
|
participant CPUs, tasks and irq-contexts would be needed
|
|
for it to trigger. The proof also does not depend on
|
|
timing: if a race and a resulting deadlock is possible
|
|
theoretically (no matter how unlikely the race scenario
|
|
is), it will be proven so and will immediately be
|
|
reported by the kernel (once the event is observed that
|
|
makes the deadlock theoretically possible).
|
|
|
|
If a deadlock is impossible (i.e. the locking rules, as
|
|
observed by the kernel, are mathematically correct), the
|
|
kernel reports nothing.
|
|
|
|
NOTE: this feature can also be enabled for rwlocks, mutexes
|
|
and rwsems - in which case all dependencies between these
|
|
different locking variants are observed and mapped too, and
|
|
the proof of observed correctness is also maintained for an
|
|
arbitrary combination of these separate locking variants.
|
|
|
|
For more details, see Documentation/locking/lockdep-design.rst.
|
|
|
|
config PROVE_RAW_LOCK_NESTING
|
|
bool
|
|
depends on PROVE_LOCKING
|
|
default y
|
|
help
|
|
Enable the raw_spinlock vs. spinlock nesting checks which ensure
|
|
that the lock nesting rules for PREEMPT_RT enabled kernels are
|
|
not violated.
|
|
|
|
config LOCK_STAT
|
|
bool "Lock usage statistics"
|
|
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
|
|
select LOCKDEP
|
|
select DEBUG_SPINLOCK
|
|
select DEBUG_MUTEXES if !PREEMPT_RT
|
|
select DEBUG_RT_MUTEXES if RT_MUTEXES
|
|
select DEBUG_LOCK_ALLOC
|
|
default n
|
|
help
|
|
This feature enables tracking lock contention points
|
|
|
|
For more details, see Documentation/locking/lockstat.rst
|
|
|
|
This also enables lock events required by "perf lock",
|
|
subcommand of perf.
|
|
If you want to use "perf lock", you also need to turn on
|
|
CONFIG_EVENT_TRACING.
|
|
|
|
CONFIG_LOCK_STAT defines "contended" and "acquired" lock events.
|
|
(CONFIG_LOCKDEP defines "acquire" and "release" events.)
|
|
|
|
config DEBUG_RT_MUTEXES
|
|
bool "RT Mutex debugging, deadlock detection"
|
|
depends on DEBUG_KERNEL && RT_MUTEXES
|
|
help
|
|
This allows rt mutex semantics violations and rt mutex related
|
|
deadlocks (lockups) to be detected and reported automatically.
|
|
|
|
config DEBUG_SPINLOCK
|
|
bool "Spinlock and rw-lock debugging: basic checks"
|
|
depends on DEBUG_KERNEL
|
|
select UNINLINE_SPIN_UNLOCK
|
|
help
|
|
Say Y here and build SMP to catch missing spinlock initialization
|
|
and certain other kinds of spinlock errors commonly made. This is
|
|
best used in conjunction with the NMI watchdog so that spinlock
|
|
deadlocks are also debuggable.
|
|
|
|
config DEBUG_MUTEXES
|
|
bool "Mutex debugging: basic checks"
|
|
depends on DEBUG_KERNEL && !PREEMPT_RT
|
|
help
|
|
This feature allows mutex semantics violations to be detected and
|
|
reported.
|
|
|
|
config DEBUG_WW_MUTEX_SLOWPATH
|
|
bool "Wait/wound mutex debugging: Slowpath testing"
|
|
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
|
|
select DEBUG_LOCK_ALLOC
|
|
select DEBUG_SPINLOCK
|
|
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
|
|
the full mutex checks enabled with (CONFIG_PROVE_LOCKING) this
|
|
will test all possible w/w mutex interface abuse with the
|
|
exception of simply not acquiring all the required locks.
|
|
Note that this feature can introduce significant overhead, so
|
|
it really should not be enabled in a production or distro kernel,
|
|
even a debug kernel. If you are a driver writer, enable it. If
|
|
you are a distro, do not.
|
|
|
|
config DEBUG_RWSEMS
|
|
bool "RW Semaphore debugging: basic checks"
|
|
depends on DEBUG_KERNEL && !PREEMPT_RT
|
|
help
|
|
This debugging feature allows mismatched rw semaphore locks
|
|
and unlocks to be detected and reported.
|
|
|
|
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 if !PREEMPT_RT
|
|
select DEBUG_RT_MUTEXES if RT_MUTEXES
|
|
select LOCKDEP
|
|
help
|
|
This feature will check whether any held lock (spinlock, rwlock,
|
|
mutex or rwsem) is incorrectly freed by the kernel, via any of the
|
|
memory-freeing routines (kfree(), kmem_cache_free(), free_pages(),
|
|
vfree(), etc.), whether a live lock is incorrectly reinitialized via
|
|
spin_lock_init()/mutex_init()/etc., or whether there is any lock
|
|
held during task exit.
|
|
|
|
config LOCKDEP
|
|
bool
|
|
depends on DEBUG_KERNEL && LOCK_DEBUGGING_SUPPORT
|
|
select STACKTRACE
|
|
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 21
|
|
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 STACK_TRACE_HASH_SIZE.
|
|
|
|
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
|
|
of more runtime overhead.
|
|
|
|
config DEBUG_ATOMIC_SLEEP
|
|
bool "Sleep inside atomic section checking"
|
|
select PREEMPT_COUNT
|
|
depends on DEBUG_KERNEL
|
|
depends on !ARCH_NO_PREEMPT
|
|
help
|
|
If you say Y here, various routines which may sleep will become very
|
|
noisy if they are called inside atomic sections: when a spinlock is
|
|
held, inside an rcu read side critical section, inside preempt disabled
|
|
sections, inside an interrupt, etc...
|
|
|
|
config DEBUG_LOCKING_API_SELFTESTS
|
|
bool "Locking API boot-time self-tests"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
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 won't be detected of course.)
|
|
The following locking APIs are covered: spinlocks, rwlocks,
|
|
mutexes and rwsems.
|
|
|
|
config LOCK_TORTURE_TEST
|
|
tristate "torture tests for locking"
|
|
depends on DEBUG_KERNEL
|
|
select TORTURE_TEST
|
|
help
|
|
This option provides a kernel module that runs torture tests
|
|
on kernel locking primitives. The kernel module may be built
|
|
after the fact on the running kernel to be tested, if desired.
|
|
|
|
Say Y here if you want kernel locking-primitive torture tests
|
|
to be built into the kernel.
|
|
Say M if you want these torture tests to build as a module.
|
|
Say N if you are unsure.
|
|
|
|
config WW_MUTEX_SELFTEST
|
|
tristate "Wait/wound mutex selftests"
|
|
help
|
|
This option provides a kernel module that runs tests on the
|
|
on the struct ww_mutex locking API.
|
|
|
|
It is recommended to enable DEBUG_WW_MUTEX_SLOWPATH in conjunction
|
|
with this test harness.
|
|
|
|
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 SMP
|
|
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.
|
|
|
|
config CSD_LOCK_WAIT_DEBUG_DEFAULT
|
|
bool "Default csd_lock_wait() debugging on at boot time"
|
|
depends on CSD_LOCK_WAIT_DEBUG
|
|
depends on 64BIT
|
|
default n
|
|
help
|
|
This option causes the csdlock_debug= kernel boot parameter to
|
|
default to 1 (basic debugging) instead of 0 (no debugging).
|
|
|
|
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 NMI_CHECK_CPU
|
|
bool "Debugging for CPUs failing to respond to backtrace requests"
|
|
depends on DEBUG_KERNEL
|
|
depends on X86
|
|
default n
|
|
help
|
|
Enables debug prints when a CPU fails to respond to a given
|
|
backtrace NMI. These prints provide some reasons why a CPU
|
|
might legitimately be failing to respond, for example, if it
|
|
is offline of if ignore_nmis is set.
|
|
|
|
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
|
|
help
|
|
This option causes the kernel to create a /proc/pid/stack for
|
|
every process, showing its current stack trace.
|
|
It is also used by various kernel debugging features that require
|
|
stack trace generation.
|
|
|
|
config WARN_ALL_UNSEEDED_RANDOM
|
|
bool "Warn for all uses of unseeded randomness"
|
|
default n
|
|
help
|
|
Some parts of the kernel contain bugs relating to their use of
|
|
cryptographically secure random numbers before it's actually possible
|
|
to generate those numbers securely. This setting ensures that these
|
|
flaws don't go unnoticed, by enabling a message, should this ever
|
|
occur. This will allow people with obscure setups to know when things
|
|
are going wrong, so that they might contact developers about fixing
|
|
it.
|
|
|
|
Unfortunately, on some models of some architectures getting
|
|
a fully seeded CRNG is extremely difficult, and so this can
|
|
result in dmesg getting spammed for a surprisingly long
|
|
time. This is really bad from a security perspective, and
|
|
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 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
|
|
those developers interested in improving the security of
|
|
Linux kernels running on their architecture (or
|
|
subarchitecture).
|
|
|
|
config DEBUG_KOBJECT
|
|
bool "kobject debugging"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
If you say Y here, some extra kobject debugging messages will be sent
|
|
to the syslog.
|
|
|
|
config DEBUG_KOBJECT_RELEASE
|
|
bool "kobject release debugging"
|
|
depends on DEBUG_OBJECTS_TIMERS
|
|
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 its
|
|
initial reference to the kobject gained on allocation. An
|
|
example of this would be a struct device which has just been
|
|
unregistered.
|
|
|
|
However, some buggy drivers assume that after such an operation,
|
|
the memory backing the kobject can be immediately freed. This
|
|
goes completely against the principles of a refcounted object.
|
|
|
|
If you say Y here, the kernel will delay the release of kobjects
|
|
on the last reference count to improve the visibility of this
|
|
kind of kobject release bug.
|
|
|
|
config HAVE_DEBUG_BUGVERBOSE
|
|
bool
|
|
|
|
menu "Debug kernel data structures"
|
|
|
|
config DEBUG_LIST
|
|
bool "Debug linked list manipulation"
|
|
depends on DEBUG_KERNEL
|
|
select LIST_HARDENED
|
|
help
|
|
Enable this to turn on extended checks in the linked-list walking
|
|
routines.
|
|
|
|
This option trades better quality error reports for performance, and
|
|
is more suitable for kernel debugging. If you care about performance,
|
|
you should only enable CONFIG_LIST_HARDENED instead.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_PLIST
|
|
bool "Debug priority linked list manipulation"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Enable this to turn on extended checks in the priority-ordered
|
|
linked-list (plist) walking routines. This checks the entire
|
|
list multiple times during each manipulation.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_SG
|
|
bool "Debug SG table operations"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Enable this to turn on checks on scatter-gather tables. This can
|
|
help find problems with drivers that do not properly initialize
|
|
their sg tables.
|
|
|
|
If unsure, say N.
|
|
|
|
config DEBUG_NOTIFIERS
|
|
bool "Debug notifier call chains"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Enable this to turn on sanity checking for notifier call chains.
|
|
This is most useful for kernel developers to make sure that
|
|
modules properly unregister themselves from notifier chains.
|
|
This is a relatively cheap check but if you care about maximum
|
|
performance, say N.
|
|
|
|
config DEBUG_CLOSURES
|
|
bool "Debug closures (bcache async widgits)"
|
|
depends on CLOSURES
|
|
select DEBUG_FS
|
|
help
|
|
Keeps all active closures in a linked list and provides a debugfs
|
|
interface to list them, which makes it possible to see asynchronous
|
|
operations that get stuck.
|
|
|
|
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
|
|
|
|
source "kernel/rcu/Kconfig.debug"
|
|
|
|
config DEBUG_WQ_FORCE_RR_CPU
|
|
bool "Force round-robin CPU selection for unbound work items"
|
|
depends on DEBUG_KERNEL
|
|
default n
|
|
help
|
|
Workqueue used to implicitly guarantee that work items queued
|
|
without explicit CPU specified are put on the local CPU. This
|
|
guarantee is no longer true and while local CPU is still
|
|
preferred work items may be put on foreign CPUs. Kernel
|
|
parameter "workqueue.debug_force_rr_cpu" is added to force
|
|
round-robin CPU selection to flush out usages which depend on the
|
|
now broken guarantee. This config option enables the debug
|
|
feature by default. When enabled, memory and cache locality will
|
|
be impacted.
|
|
|
|
config CPU_HOTPLUG_STATE_CONTROL
|
|
bool "Enable CPU hotplug state control"
|
|
depends on DEBUG_KERNEL
|
|
depends on HOTPLUG_CPU
|
|
default n
|
|
help
|
|
Allows to write steps between "offline" and "online" to the CPUs
|
|
sysfs target file so states can be stepped granular. This is a debug
|
|
option for now as the hotplug machinery cannot be stopped and
|
|
restarted at arbitrary points yet.
|
|
|
|
Say N if your are unsure.
|
|
|
|
config LATENCYTOP
|
|
bool "Latency measuring infrastructure"
|
|
depends on DEBUG_KERNEL
|
|
depends on STACKTRACE_SUPPORT
|
|
depends on PROC_FS
|
|
depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
|
|
select KALLSYMS
|
|
select KALLSYMS_ALL
|
|
select STACKTRACE
|
|
select SCHEDSTATS
|
|
help
|
|
Enable this option if you want to use the LatencyTOP tool
|
|
to find out which userspace is blocking on what kernel operations.
|
|
|
|
config DEBUG_CGROUP_REF
|
|
bool "Disable inlining of cgroup css reference count functions"
|
|
depends on DEBUG_KERNEL
|
|
depends on CGROUPS
|
|
depends on KPROBES
|
|
default n
|
|
help
|
|
Force cgroup css reference count functions to not be inlined so
|
|
that they can be kprobed for debugging.
|
|
|
|
source "kernel/trace/Kconfig"
|
|
|
|
config PROVIDE_OHCI1394_DMA_INIT
|
|
bool "Remote debugging over FireWire early on boot"
|
|
depends on PCI && X86
|
|
help
|
|
If you want to debug problems which hang or crash the kernel early
|
|
on boot and the crashing machine has a FireWire port, you can use
|
|
this feature to remotely access the memory of the crashed machine
|
|
over FireWire. This employs remote DMA as part of the OHCI1394
|
|
specification which is now the standard for FireWire controllers.
|
|
|
|
With remote DMA, you can monitor the printk buffer remotely using
|
|
firescope and access all memory below 4GB using fireproxy from gdb.
|
|
Even controlling a kernel debugger is possible using remote DMA.
|
|
|
|
Usage:
|
|
|
|
If ohci1394_dma=early is used as boot parameter, it will initialize
|
|
all OHCI1394 controllers which are found in the PCI config space.
|
|
|
|
As all changes to the FireWire bus such as enabling and disabling
|
|
devices cause a bus reset and thereby disable remote DMA for all
|
|
devices, be sure to have the cable plugged and FireWire enabled on
|
|
the debugging host before booting the debug target for debugging.
|
|
|
|
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/core-api/debugging-via-ohci1394.rst for more information.
|
|
|
|
source "samples/Kconfig"
|
|
|
|
config ARCH_HAS_DEVMEM_IS_ALLOWED
|
|
bool
|
|
|
|
config STRICT_DEVMEM
|
|
bool "Filter access to /dev/mem"
|
|
depends on MMU && DEVMEM
|
|
depends on ARCH_HAS_DEVMEM_IS_ALLOWED || GENERIC_LIB_DEVMEM_IS_ALLOWED
|
|
default y if PPC || X86 || ARM64 || S390
|
|
help
|
|
If this option is disabled, you allow userspace (root) access to all
|
|
of memory, including kernel and userspace memory. Accidental
|
|
access to this is obviously disastrous, but specific access can
|
|
be used by people debugging the kernel. Note that with PAT support
|
|
enabled, even in this case there are restrictions on /dev/mem
|
|
use due to the cache aliasing requirements.
|
|
|
|
If this option is switched on, and IO_STRICT_DEVMEM=n, the /dev/mem
|
|
file only allows userspace access to PCI space and the BIOS code and
|
|
data regions. This is sufficient for dosemu and X and all common
|
|
users of /dev/mem.
|
|
|
|
If in doubt, say Y.
|
|
|
|
config IO_STRICT_DEVMEM
|
|
bool "Filter I/O access to /dev/mem"
|
|
depends on STRICT_DEVMEM
|
|
help
|
|
If this option is disabled, you allow userspace (root) access to all
|
|
io-memory regardless of whether a driver is actively using that
|
|
range. Accidental access to this is obviously disastrous, but
|
|
specific access can be used by people debugging kernel drivers.
|
|
|
|
If this option is switched on, the /dev/mem file only allows
|
|
userspace access to *idle* io-memory ranges (see /proc/iomem) This
|
|
may break traditional users of /dev/mem (dosemu, legacy X, etc...)
|
|
if the driver using a given range cannot be disabled.
|
|
|
|
If in doubt, say Y.
|
|
|
|
menu "$(SRCARCH) Debugging"
|
|
|
|
source "arch/$(SRCARCH)/Kconfig.debug"
|
|
|
|
endmenu
|
|
|
|
menu "Kernel Testing and Coverage"
|
|
|
|
source "lib/kunit/Kconfig"
|
|
|
|
config NOTIFIER_ERROR_INJECTION
|
|
tristate "Notifier error injection"
|
|
depends on DEBUG_KERNEL
|
|
select DEBUG_FS
|
|
help
|
|
This option provides the ability to inject artificial errors to
|
|
specified notifier chain callbacks. It is useful to test the error
|
|
handling of notifier call chain failures.
|
|
|
|
Say N if unsure.
|
|
|
|
config PM_NOTIFIER_ERROR_INJECT
|
|
tristate "PM notifier error injection module"
|
|
depends on PM && NOTIFIER_ERROR_INJECTION
|
|
default m if PM_DEBUG
|
|
help
|
|
This option provides the ability to inject artificial errors to
|
|
PM notifier chain callbacks. It is controlled through debugfs
|
|
interface /sys/kernel/debug/notifier-error-inject/pm
|
|
|
|
If the notifier call chain should be failed with some events
|
|
notified, write the error code to "actions/<notifier event>/error".
|
|
|
|
Example: Inject PM suspend error (-12 = -ENOMEM)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/pm/
|
|
# echo -12 > actions/PM_SUSPEND_PREPARE/error
|
|
# echo mem > /sys/power/state
|
|
bash: echo: write error: Cannot allocate memory
|
|
|
|
To compile this code as a module, choose M here: the module will
|
|
be called pm-notifier-error-inject.
|
|
|
|
If unsure, say N.
|
|
|
|
config OF_RECONFIG_NOTIFIER_ERROR_INJECT
|
|
tristate "OF reconfig notifier error injection module"
|
|
depends on OF_DYNAMIC && NOTIFIER_ERROR_INJECTION
|
|
help
|
|
This option provides the ability to inject artificial errors to
|
|
OF reconfig notifier chain callbacks. It is controlled
|
|
through debugfs interface under
|
|
/sys/kernel/debug/notifier-error-inject/OF-reconfig/
|
|
|
|
If the notifier call chain should be failed with some events
|
|
notified, write the error code to "actions/<notifier event>/error".
|
|
|
|
To compile this code as a module, choose M here: the module will
|
|
be called of-reconfig-notifier-error-inject.
|
|
|
|
If unsure, say N.
|
|
|
|
config NETDEV_NOTIFIER_ERROR_INJECT
|
|
tristate "Netdev notifier error injection module"
|
|
depends on NET && NOTIFIER_ERROR_INJECTION
|
|
help
|
|
This option provides the ability to inject artificial errors to
|
|
netdevice notifier chain callbacks. It is controlled through debugfs
|
|
interface /sys/kernel/debug/notifier-error-inject/netdev
|
|
|
|
If the notifier call chain should be failed with some events
|
|
notified, write the error code to "actions/<notifier event>/error".
|
|
|
|
Example: Inject netdevice mtu change error (-22 = -EINVAL)
|
|
|
|
# cd /sys/kernel/debug/notifier-error-inject/netdev
|
|
# echo -22 > actions/NETDEV_CHANGEMTU/error
|
|
# ip link set eth0 mtu 1024
|
|
RTNETLINK answers: Invalid argument
|
|
|
|
To compile this code as a module, choose M here: the module will
|
|
be called netdev-notifier-error-inject.
|
|
|
|
If unsure, say N.
|
|
|
|
config FUNCTION_ERROR_INJECTION
|
|
bool "Fault-injections of functions"
|
|
depends on HAVE_FUNCTION_ERROR_INJECTION && KPROBES
|
|
help
|
|
Add fault injections into various functions that are annotated with
|
|
ALLOW_ERROR_INJECTION() in the kernel. BPF may also modify the return
|
|
value of these functions. This is useful to test error paths of code.
|
|
|
|
If unsure, say N
|
|
|
|
config FAULT_INJECTION
|
|
bool "Fault-injection framework"
|
|
depends on DEBUG_KERNEL
|
|
help
|
|
Provide fault-injection framework.
|
|
For more details, see Documentation/fault-injection/.
|
|
|
|
config FAILSLAB
|
|
bool "Fault-injection capability for kmalloc"
|
|
depends on FAULT_INJECTION
|
|
help
|
|
Provide fault-injection capability for kmalloc.
|
|
|
|
config FAIL_PAGE_ALLOC
|
|
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
|
|
help
|
|
Provide fault-injection capability for disk IO.
|
|
|
|
config FAIL_IO_TIMEOUT
|
|
bool "Fault-injection capability for faking disk interrupts"
|
|
depends on FAULT_INJECTION && BLOCK
|
|
help
|
|
Provide fault-injection capability on end IO handling. This
|
|
will make the block layer "forget" an interrupt as configured,
|
|
thus exercising the error handling.
|
|
|
|
Only works with drivers that use the generic timeout handling,
|
|
for others it won't do anything.
|
|
|
|
config FAIL_FUTEX
|
|
bool "Fault-injection capability for futexes"
|
|
select DEBUG_FS
|
|
depends on FAULT_INJECTION && FUTEX
|
|
help
|
|
Provide fault-injection capability for futexes.
|
|
|
|
config FAULT_INJECTION_DEBUG_FS
|
|
bool "Debugfs entries for fault-injection capabilities"
|
|
depends on FAULT_INJECTION && SYSFS && DEBUG_FS
|
|
help
|
|
Enable configuration of fault-injection capabilities via debugfs.
|
|
|
|
config FAIL_FUNCTION
|
|
bool "Fault-injection capability for functions"
|
|
depends on FAULT_INJECTION_DEBUG_FS && FUNCTION_ERROR_INJECTION
|
|
help
|
|
Provide function-based fault-injection capability.
|
|
This will allow you to override a specific function with a return
|
|
with given return value. As a result, function caller will see
|
|
an error value and have to handle it. This is useful to test the
|
|
error handling in various subsystems.
|
|
|
|
config FAIL_MMC_REQUEST
|
|
bool "Fault-injection capability for MMC IO"
|
|
depends on FAULT_INJECTION_DEBUG_FS && MMC
|
|
help
|
|
Provide fault-injection capability for MMC IO.
|
|
This will make the mmc core return data errors. This is
|
|
useful to test the error handling in the mmc block device
|
|
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_CONFIGFS
|
|
bool "Configfs interface for fault-injection capabilities"
|
|
depends on FAULT_INJECTION
|
|
select CONFIGFS_FS
|
|
help
|
|
This option allows configfs-based drivers to dynamically configure
|
|
fault-injection via configfs. Each parameter for driver-specific
|
|
fault-injection can be made visible as a configfs attribute in a
|
|
configfs group.
|
|
|
|
|
|
config FAULT_INJECTION_STACKTRACE_FILTER
|
|
bool "stacktrace filter for fault-injection capabilities"
|
|
depends on FAULT_INJECTION
|
|
depends on (FAULT_INJECTION_DEBUG_FS || FAULT_INJECTION_CONFIGFS) && STACKTRACE_SUPPORT
|
|
select STACKTRACE
|
|
depends on FRAME_POINTER || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86
|
|
help
|
|
Provide stacktrace filter for fault-injection capabilities
|
|
|
|
config ARCH_HAS_KCOV
|
|
bool
|
|
help
|
|
An architecture should select this when it can successfully
|
|
build and run with CONFIG_KCOV. This typically requires
|
|
disabling instrumentation for some early boot code.
|
|
|
|
config CC_HAS_SANCOV_TRACE_PC
|
|
def_bool $(cc-option,-fsanitize-coverage=trace-pc)
|
|
|
|
|
|
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 || CC_IS_CLANG
|
|
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).
|
|
|
|
For more details, see Documentation/dev-tools/kcov.rst.
|
|
|
|
config KCOV_ENABLE_COMPARISONS
|
|
bool "Enable comparison operands collection by KCOV"
|
|
depends on KCOV
|
|
depends on $(cc-option,-fsanitize-coverage=trace-cmp)
|
|
help
|
|
KCOV also exposes operands of every comparison in the instrumented
|
|
code along with operand sizes and PCs of the comparison instructions.
|
|
These operands can be used by fuzzing engines to improve the quality
|
|
of fuzzing coverage.
|
|
|
|
config KCOV_INSTRUMENT_ALL
|
|
bool "Instrument all code by default"
|
|
depends on KCOV
|
|
default y
|
|
help
|
|
If you are doing generic system call fuzzing (like e.g. syzkaller),
|
|
then you will want to instrument the whole kernel and you should
|
|
say y here. If you are doing more targeted fuzzing (like e.g.
|
|
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.
|
|
|
|
config KCOV_SELFTEST
|
|
bool "Perform short selftests on boot"
|
|
depends on KCOV
|
|
help
|
|
Run short KCOV coverage collection selftests on boot.
|
|
On test failure, causes the kernel to panic. Recommended to be
|
|
enabled, ensuring critical functionality works as intended.
|
|
|
|
menuconfig RUNTIME_TESTING_MENU
|
|
bool "Runtime Testing"
|
|
default y
|
|
|
|
if RUNTIME_TESTING_MENU
|
|
|
|
config TEST_DHRY
|
|
tristate "Dhrystone benchmark test"
|
|
help
|
|
Enable this to include the Dhrystone 2.1 benchmark. This test
|
|
calculates the number of Dhrystones per second, and the number of
|
|
DMIPS (Dhrystone MIPS) obtained when the Dhrystone score is divided
|
|
by 1757 (the number of Dhrystones per second obtained on the VAX
|
|
11/780, nominally a 1 MIPS machine).
|
|
|
|
To run the benchmark, it needs to be enabled explicitly, either from
|
|
the kernel command line (when built-in), or from userspace (when
|
|
built-in or modular).
|
|
|
|
Run once during kernel boot:
|
|
|
|
test_dhry.run
|
|
|
|
Set number of iterations from kernel command line:
|
|
|
|
test_dhry.iterations=<n>
|
|
|
|
Set number of iterations from userspace:
|
|
|
|
echo <n> > /sys/module/test_dhry/parameters/iterations
|
|
|
|
Trigger manual run from userspace:
|
|
|
|
echo y > /sys/module/test_dhry/parameters/run
|
|
|
|
If the number of iterations is <= 0, the test will devise a suitable
|
|
number of iterations (test runs for at least 2s) automatically.
|
|
This process takes ca. 4s.
|
|
|
|
If unsure, say N.
|
|
|
|
config LKDTM
|
|
tristate "Linux Kernel Dump Test Tool Module"
|
|
depends on DEBUG_FS
|
|
help
|
|
This module enables testing of the different dumping mechanisms by
|
|
inducing system failures at predefined crash points.
|
|
If you don't need it: say N
|
|
Choose M here to compile this code as a module. The module will be
|
|
called 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" 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),
|
|
or at module load time.
|
|
|
|
If unsure, say N.
|
|
|
|
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 TEST_MULDIV64
|
|
tristate "mul_u64_u64_div_u64() test"
|
|
depends on DEBUG_KERNEL || m
|
|
help
|
|
Enable this to turn on 'mul_u64_u64_div_u64()' 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 TEST_IOV_ITER
|
|
tristate "Test iov_iter operation" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
depends on MMU
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
Enable this to turn on testing of the operation of the I/O iterator
|
|
(iov_iter). 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
|
|
tristate "Kprobes sanity tests" if !KUNIT_ALL_TESTS
|
|
depends on DEBUG_KERNEL
|
|
depends on KPROBES
|
|
depends on KUNIT
|
|
select STACKTRACE if ARCH_CORRECT_STACKTRACE_ON_KRETPROBE
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
This option provides for testing basic kprobes functionality on
|
|
boot. Samples of kprobe and kretprobe are inserted and
|
|
verified for functionality.
|
|
|
|
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
|
|
help
|
|
This option provides a kernel module that can be used to test
|
|
the kernel stack backtrace code. This option is not useful
|
|
for distributions or general kernels, but only for kernel
|
|
developers working on architecture code.
|
|
|
|
Note that if you want to also test saved backtraces, you will
|
|
have to enable STACKTRACE as well.
|
|
|
|
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
|
|
help
|
|
A benchmark measuring the performance of the rbtree library.
|
|
Also includes rbtree invariant checks.
|
|
|
|
config REED_SOLOMON_TEST
|
|
tristate "Reed-Solomon library test"
|
|
depends on DEBUG_KERNEL || m
|
|
select REED_SOLOMON
|
|
select REED_SOLOMON_ENC16
|
|
select REED_SOLOMON_DEC16
|
|
help
|
|
This option enables the self-test function of rslib at boot,
|
|
or at module load time.
|
|
|
|
If unsure, say N.
|
|
|
|
config INTERVAL_TREE_TEST
|
|
tristate "Interval tree test"
|
|
depends on DEBUG_KERNEL
|
|
select INTERVAL_TREE
|
|
help
|
|
A benchmark measuring the performance of the interval tree library
|
|
|
|
config PERCPU_TEST
|
|
tristate "Per cpu operations test"
|
|
depends on m && DEBUG_KERNEL
|
|
help
|
|
Enable this option to build test module which validates per-cpu
|
|
operations.
|
|
|
|
If unsure, say N.
|
|
|
|
config ATOMIC64_SELFTEST
|
|
tristate "Perform an atomic64_t self-test"
|
|
help
|
|
Enable this option to test the atomic64_t functions at boot or
|
|
at module load time.
|
|
|
|
If unsure, say N.
|
|
|
|
config ASYNC_RAID6_TEST
|
|
tristate "Self test for hardware accelerated raid6 recovery"
|
|
depends on ASYNC_RAID6_RECOV
|
|
select ASYNC_MEMCPY
|
|
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
|
|
raid6 recovery routines, and will optionally use an offload
|
|
engine if one is available.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_HEXDUMP
|
|
tristate "Test functions located in the hexdump module at runtime"
|
|
|
|
config STRING_KUNIT_TEST
|
|
tristate "KUnit test string functions at runtime" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
|
|
config STRING_HELPERS_KUNIT_TEST
|
|
tristate "KUnit test string helpers at runtime" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
|
|
config TEST_KSTRTOX
|
|
tristate "Test kstrto*() family of functions at runtime"
|
|
|
|
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
|
|
Enable this option to test the bitmap 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_MAPLE_TREE
|
|
tristate "Test the Maple Tree code at runtime or module load"
|
|
help
|
|
Enable this option to test the maple tree code functions at boot, or
|
|
when the module is loaded. Enable "Debug Maple Trees" will enable
|
|
more verbose output on failures.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_RHASHTABLE
|
|
tristate "Perform selftest on resizable hash table"
|
|
help
|
|
Enable this option to test the rhashtable functions at boot.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_IDA
|
|
tristate "Perform selftest on IDA functions"
|
|
|
|
config TEST_PARMAN
|
|
tristate "Perform selftest on priority array manager"
|
|
depends on PARMAN
|
|
help
|
|
Enable this option to test priority array manager on boot
|
|
(or module load).
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_IRQ_TIMINGS
|
|
bool "IRQ timings selftest"
|
|
depends on IRQ_TIMINGS
|
|
help
|
|
Enable this option to test the irq timings code on boot.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_LKM
|
|
tristate "Test module loading with 'hello world' module"
|
|
depends on m
|
|
help
|
|
This builds the "test_module" module that emits "Hello, world"
|
|
on printk when loaded. It is designed to be used for basic
|
|
evaluation of the module loading subsystem (for example when
|
|
validating module verification). It lacks any extra dependencies,
|
|
and will not normally be loaded by the system unless explicitly
|
|
requested by name.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_BITOPS
|
|
tristate "Test module for compilation of bitops operations"
|
|
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
|
|
depends on MMU
|
|
depends on m
|
|
help
|
|
This builds the "test_vmalloc" module that should be used for
|
|
stress and performance analysis. So, any new change for vmalloc
|
|
subsystem can be evaluated from performance and stability point
|
|
of view.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_BPF
|
|
tristate "Test BPF filter functionality"
|
|
depends on m && NET
|
|
help
|
|
This builds the "test_bpf" module that runs various test vectors
|
|
against the BPF interpreter or BPF JIT compiler depending on the
|
|
current setting. This is in particular useful for BPF JIT compiler
|
|
development, but also to run regression tests against changes in
|
|
the interpreter code. It also enables test stubs for eBPF maps and
|
|
verifier used by user space verifier testsuite.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_BLACKHOLE_DEV
|
|
tristate "Test blackhole netdev functionality"
|
|
depends on m && NET
|
|
help
|
|
This builds the "test_blackhole_dev" module that validates the
|
|
data path through this blackhole netdev.
|
|
|
|
If unsure, say N.
|
|
|
|
config FIND_BIT_BENCHMARK
|
|
tristate "Test find_bit functions"
|
|
help
|
|
This builds the "test_find_bit" module that measure find_*_bit()
|
|
functions performance.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_FIRMWARE
|
|
tristate "Test firmware loading via userspace interface"
|
|
depends on FW_LOADER
|
|
help
|
|
This builds the "test_firmware" module that creates a userspace
|
|
interface for testing firmware loading. This can be used to
|
|
control the triggering of firmware loading without needing an
|
|
actual firmware-using device. The contents can be rechecked by
|
|
userspace.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_SYSCTL
|
|
tristate "sysctl test driver"
|
|
depends on PROC_SYSCTL
|
|
help
|
|
This builds the "test_sysctl" module. This driver enables to test the
|
|
proc sysctl interfaces available to drivers safely without affecting
|
|
production knobs which might alter system functionality.
|
|
|
|
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 CHECKSUM_KUNIT
|
|
tristate "KUnit test checksum functions at runtime" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
Enable this option to test the checksum 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
|
|
select GET_FREE_REGION
|
|
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" 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.
|
|
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 LIST_KUNIT_TEST
|
|
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 (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/.
|
|
|
|
If unsure, say N.
|
|
|
|
config HASHTABLE_KUNIT_TEST
|
|
tristate "KUnit Test for Kernel Hashtable structures" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
This builds the hashtable KUnit test suite.
|
|
It tests the basic functionality of the API defined in
|
|
include/linux/hashtable.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 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
|
|
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 SIPHASH_KUNIT_TEST
|
|
tristate "Perform selftest on siphash functions" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
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.
|
|
|
|
config USERCOPY_KUNIT_TEST
|
|
tristate "KUnit Test for user/kernel boundary protections"
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
This builds the "usercopy_kunit" module that runs sanity checks
|
|
on the copy_to/from_user infrastructure, making sure basic
|
|
user/kernel boundary testing is working.
|
|
|
|
config TEST_UDELAY
|
|
tristate "udelay test driver"
|
|
help
|
|
This builds the "udelay_test" module that helps to make sure
|
|
that udelay() is working properly.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_STATIC_KEYS
|
|
tristate "Test static keys"
|
|
depends on m
|
|
help
|
|
Test the static key interfaces.
|
|
|
|
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
|
|
select BTRFS_FS
|
|
help
|
|
Test the kernel's module loading mechanism: kmod. kmod implements
|
|
support to load modules using the Linux kernel's usermode helper.
|
|
This test provides a series of tests against kmod.
|
|
|
|
Although technically you can either build test_kmod as a module or
|
|
into the kernel we disallow building it into the kernel since
|
|
it stress tests request_module() and this will very likely cause
|
|
some issues by taking over precious threads available from other
|
|
module load requests, ultimately this could be fatal.
|
|
|
|
To run tests run:
|
|
|
|
tools/testing/selftests/kmod/kmod.sh --help
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_DEBUG_VIRTUAL
|
|
tristate "Test CONFIG_DEBUG_VIRTUAL feature"
|
|
depends on DEBUG_VIRTUAL
|
|
help
|
|
Test the kernel's ability to detect incorrect calls to
|
|
virt_to_phys() done against the non-linear part of the
|
|
kernel's virtual address map.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_MEMCAT_P
|
|
tristate "Test memcat_p() helper function"
|
|
help
|
|
Test the memcat_p() helper for correctly merging two
|
|
pointer arrays together.
|
|
|
|
If unsure, say N.
|
|
|
|
config TEST_OBJAGG
|
|
tristate "Perform selftest on object aggreration manager"
|
|
default n
|
|
depends on OBJAGG
|
|
help
|
|
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_HMM
|
|
tristate "Test HMM (Heterogeneous Memory Management)"
|
|
depends on TRANSPARENT_HUGEPAGE
|
|
depends on DEVICE_PRIVATE
|
|
select HMM_MIRROR
|
|
select MMU_NOTIFIER
|
|
help
|
|
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_FREE_PAGES
|
|
tristate "Test freeing pages"
|
|
help
|
|
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 ARCH_HAS_KERNEL_FPU_SUPPORT && !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.
|
|
|
|
config TEST_OBJPOOL
|
|
tristate "Test module for correctness and stress of objpool"
|
|
default n
|
|
depends on m && DEBUG_KERNEL
|
|
help
|
|
This builds the "test_objpool" module that should be used for
|
|
correctness verification and concurrent testings of objects
|
|
allocation and reclamation.
|
|
|
|
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"
|
|
depends on ARCH_USE_MEMTEST
|
|
help
|
|
This option adds a kernel parameter 'memtest', which allows memtest
|
|
to be set and executed.
|
|
memtest=0, mean disabled; -- default
|
|
memtest=1, mean do 1 test pattern;
|
|
...
|
|
memtest=17, mean do 17 test patterns.
|
|
If you are unsure how to answer this question, answer N.
|
|
|
|
|
|
|
|
config HYPERV_TESTING
|
|
bool "Microsoft Hyper-V driver testing"
|
|
default n
|
|
depends on HYPERV && DEBUG_FS
|
|
help
|
|
Select this option to enable Hyper-V vmbus 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.
|
|
|
|
config RUST_BUILD_ASSERT_ALLOW
|
|
bool "Allow unoptimized build-time assertions"
|
|
depends on RUST
|
|
help
|
|
Controls how `build_error!` and `build_assert!` are handled during the build.
|
|
|
|
If calls to them exist in the binary, it may indicate a violated invariant
|
|
or that the optimizer failed to verify the invariant during compilation.
|
|
|
|
This should not happen, thus by default the build is aborted. However,
|
|
as an escape hatch, you can choose Y here to ignore them during build
|
|
and let the check be carried at runtime (with `panic!` being called if
|
|
the check fails).
|
|
|
|
If unsure, say N.
|
|
|
|
config RUST_KERNEL_DOCTESTS
|
|
bool "Doctests for the `kernel` crate" if !KUNIT_ALL_TESTS
|
|
depends on RUST && KUNIT=y
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
This builds the documentation tests of the `kernel` crate
|
|
as KUnit tests.
|
|
|
|
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.
|
|
|
|
endmenu # "Rust"
|
|
|
|
endmenu # Kernel hacking
|
|
|
|
config INT_POW_TEST
|
|
tristate "Integer exponentiation (int_pow) test" if !KUNIT_ALL_TESTS
|
|
depends on KUNIT
|
|
default KUNIT_ALL_TESTS
|
|
help
|
|
This option enables the KUnit test suite for the int_pow function,
|
|
which performs integer exponentiation. The test suite is designed to
|
|
verify that the implementation of int_pow correctly computes the power
|
|
of a given base raised to a given exponent.
|
|
|
|
Enabling this option will include tests that check various scenarios
|
|
and edge cases to ensure the accuracy and reliability of the exponentiation
|
|
function.
|
|
|
|
If unsure, say N
|