This commit adds a TINY scenario in order to support tests of Tiny RCU
and Tiny SRCU.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Some servers have limitations on the number of CPUs a given guest OS
can use. In my earlier experience, such limitations have been at least
half of the host's CPUs, but in a recent example, this limit is less
than 40%. This commit therefore adds a --guest-cpu-limit argument that
allows such low limits to be made known to torture.sh.
Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
This commit adds the rcutree.nohz_full_patience_delay=1000 kernel boot
parameter to the TREE07 scenario, on the observation that "if it ain't
tested, it don't work".
Signed-off-by: "Paul E. McKenney" <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Add CFcommon.arch for arch-specific Kconfig options.
In accordance with [1], [2] and [3], move the x86-specific kernel option
CONFIG_HYPERVISOR_GUEST to CFcommon.i686 and CFcommon.x86_64, and also
move the x86/PowerPC CONFIG_KVM_GUEST Kconfig option to CFcommon.i686,
CFcommon.x86_64, and CFcommon.ppc64le.
The "arch" in CFcommon.arch is taken from the "uname -m" command.
[1] https://lore.kernel.org/all/20240427005626.1365935-1-zhouzhouyi@gmail.com/
[2] https://lore.kernel.org/all/059d36ce-6453-42be-a31e-895abd35d590@paulmck-laptop/
[3] https://lore.kernel.org/all/ZnBkHosMDhsh4H8g@J2N7QTR9R3/
Tested in x86_64 and PPC VM of Open Source Lab of Oregon State University.
Fixes: a6fda6dab9 ("rcutorture: Tweak kvm options")
Suggested-by: Paul E. McKenney <paulmck@kernel.org>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Currently, the torture.sh --do-kvfree testing is hard-coded to ten
minutes, ignoring the --duration argument. This commit therefore scales
this test duration the same as for the rcutorture tests.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
The TREE09 rcutorture scenario exhausts memory from time to time, and
this is due to a reader being preempted and blocking grace periods,
thus preventing recycling of the memory used in callback-flooding tests.
This commit therefore enables RCU priority boosting and sets the boosting
delay to 100 milliseconds after grace-period start.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Now that the KPROBES, TRACING, BLK_DEV_IO_TRACE, and UPROBE_EVENTS
Kconfig options select the TASKS_TRACE_RCU option, the torture.sh tests
of enabling exactly one of the RCU Tasks flavors fail. This commit
therefore disables these options to allow this testing to succeed.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
The tradition, extending back almost a full year, has been 2GB plus an
additional number of GBs equal to the number of CPUs divided by sixteen.
This tradition has served scftorture well, even the CONFIG_PREEMPT=y
version running KASAN within guest OSes having 40 CPUs. However, this
test recently started OOMing on larger systems, and this commit therefore
gives this test an additional GB of memory.
It is quite possible that further testing on larger systems will show
a need to decrease the divisor from 16 to (say) 8, but that is a change
to make once it has been demonstrated to be required.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
On a 8-socket server the TSC is wrongly marked as 'unstable' and disabled
during boot time on about one out of 120 boot attempts:
clocksource: timekeeping watchdog on CPU227: wd-tsc-wd excessive read-back delay of 153560ns vs. limit of 125000ns,
wd-wd read-back delay only 11440ns, attempt 3, marking tsc unstable
tsc: Marking TSC unstable due to clocksource watchdog
TSC found unstable after boot, most likely due to broken BIOS. Use 'tsc=unstable'.
sched_clock: Marking unstable (119294969739, 159204297)<-(125446229205, -5992055152)
clocksource: Checking clocksource tsc synchronization from CPU 319 to CPUs 0,99,136,180,210,542,601,896.
clocksource: Switched to clocksource hpet
The reason is that for platform with a large number of CPUs, there are
sporadic big or huge read latencies while reading the watchog/clocksource
during boot or when system is under stress work load, and the frequency and
maximum value of the latency goes up with the number of online CPUs.
The cCurrent code already has logic to detect and filter such high latency
case by reading the watchdog twice and checking the two deltas. Due to the
randomness of the latency, there is a low probabilty that the first delta
(latency) is big, but the second delta is small and looks valid. The
watchdog code retries the readouts by default twice, which is not
necessarily sufficient for systems with a large number of CPUs.
There is a command line parameter 'max_cswd_read_retries' which allows to
increase the number of retries, but that's not user friendly as it needs to
be tweaked per system. As the number of required retries is proportional to
the number of online CPUs, this parameter can be calculated at runtime.
Scale and enlarge the number of retries according to the number of online
CPUs and remove the command line parameter completely.
[ tglx: Massaged change log and comments ]
Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Jin Wang <jin1.wang@intel.com>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Waiman Long <longman@redhat.com>
Reviewed-by: Paul E. McKenney <paulmck@kernel.org>
Link: https://lore.kernel.org/r/20240221060859.1027450-1-feng.tang@intel.com
There is code in rcu_implicit_dynticks_qs() that checks for the current
grace period being halfway to the RCU CPU stall timeout, but rcutorture
currently does not test this code. This commit therefore adds a 14-second
stall to the TREE07 scenario in order to test this code given the default
RCU CPU stall warning timeout of 21 seconds.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.iitr10@gmail.com>
Use nolibc for all support architectures.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Neeraj Upadhyay (AMD) <neeraj.iitr10@gmail.com>
This commit does the long-overdue conversion of the parse-console.sh
file to use mktemp to create its temporary directory.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit adds a --debug-info argument to kvm.sh in order to ease
interpretation of addresses printed on the console and the like.
This argument also disables KASLR.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
In torture.sh, the testing of refscale incorrectly used verbose_batched
as a kernel boot parameter, which causes this parameter to be passed
to the init process. This commit therefore prefixes it with refscale,
so that refscale.verbose_batched is passed to the kernel.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
When debugging, it can be difficult to quickly find the ftrace dump
within the console log, which in turn makes it difficult to process it
independent of the rest of the console output. This commit therefore
copies the contents of the buffers into its own file to make it easier
to locate and process the ftrace dump. The original ftrace dump is still
available in the console log in cases because it can be more convenient
to process it in situ, for example, for scripts that process console
output as well as ftrace-dump data.
Also handle the case of multiple ftrace dumps potentially showing up in the
log. Example for a file like [1], it will extract as [2].
[1]:
foo
foo
Dumping ftrace buffer:
---------------------------------
blah
blah
---------------------------------
more
bar
baz
Dumping ftrace buffer:
---------------------------------
blah2
blah2
---------------------------------
bleh
bleh
[2]:
Ftrace dump 1:
blah
blah
Ftrace dump 2:
blah2
blah2
[ paulmck: Fixed awk indentation, input up front. ]
Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit adds CONFIG_DEBUG_OBJECTS=y to the TRACE02 rcutorture scenario
to catch any further RCU Tasks bugs involving this Kconfig option.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit switches from the old "/tmp/kvm-recheck.sh.$$" approach to
the newer and now reliable "mktemp" approach.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This pull request prevents some memory-exhaustion false-postitive failures
in scftorture testing.
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Merge tag 'scftorture.2023.08.15a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu
Pull smp_call_function torture-test updates from Paul McKenney:
"This prevents some memory-exhaustion false-postitive failures in
scftorture testing"
* tag 'scftorture.2023.08.15a' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu:
scftorture: Add CONFIG_PREEMPT_DYNAMIC=n to NOPREEMPT scenario
scftorture: Pause testing after memory-allocation failure
scftorture: Forgive memory-allocation failure if KASAN
torture: Scale scftorture memory based on number of CPUs
Currently, if the C program created by mkinitrd.sh has compile errors,
the errors are printed, but kvm.sh soldiers on, building kernels that
have init-less initrd setups. The kernels then fail on boot when they
attempt to mount non-existent root filesystems.
This commit therefore improves user friendliness by making mkinitrd.sh
return non-zero exit status on compile errors, which in turn causes kvm.sh
to take an early exit, with the compile errors still clearly visible.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit causes the init program generated by mkinitrd.sh dump out
its parameters. Although this is in some sense redundant given that
the kernel already dumps them out, confirmation can be a good thing.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit switches the qemu argument "-nographic" to "-display none",
aligning with the nolibc tests.
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit adds the __loongarch__, __loongarch_lp64, and
__loongarch_double_float targets to rcutorture's mkinitrd.sh
script in order to allow nolibc init programs for loongarch.
[ paulmck: Apply feedback from Feiyang Chen. ]
Cc: Feiyang Chen <chenfeiyang@loongson.cn>
Cc: Huacai Chen <chenhuacai@loongson.cn>
Cc: Willy Tarreau <w@1wt.eu>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Currently, the various torture tests sometimes react to an early-boot
bug by rebooting. This is almost always counterproductive, needlessly
consuming CPU time and bloating the console log. This commit therefore
adds the "-no-reboot" argument to qemu so that reboot requests will
cause qemu to exit.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit adds srcu_lockdep.sh to torture.sh, thus exercizing the
extended SRCU-aware lockdep-RCU functionality on a regular basis.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
KCSAN enables some Kconfig options unilaterally and unconditionally,
including CONFIG_PROVE_LOCKING. This in turn enables CONFIG_PROVE_RCU
and CONFIG_PREEMPT_COUNT, which conflicts with constraints in SRCU-T,
TRACE01, and TREE10, which in turn causes rcutorture to emit spurious
configuration complaints. This commit therefore forgives configuration
complaints involving CONFIG_PROVE_RCU and CONFIG_PREEMPT_COUNT.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
If some of the torture.sh runs had config and/or build errors, but all
runs for which kernels were built ran successfully to completion, then
torture.sh will incorrectly claim that all errors were KCSAN errors.
This commit therefore makes torture.sh print the number of runs with
config and build errors, and to refrain from claiming that all bugs were
KCSAN bugs in that case.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Currently, the kernel boot parameters specified by the kvm.sh --bootargs
parameter are placed near the beginning of the -append list that is
passed to qemu. This means that in the not-uncommon case of a kernel
boot parameter where the last argument wins, the --bootargs list overrides
neither the list in the .boot file nor the additional parameters supplied
by the rcutorture scripting.
This commit therefore places the kernel boot parameters specified by
the kvm.sh --bootargs parameter at the end of qemu's -append list.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
The mkinitrd.sh script no longer takes an argument, so this commit
therefore removes the code that checks for the parameter being present.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Currently, if the initial ssh fails, kvm-remote.sh gives up, printing a
message saying so. But it would be nice to get a better idea as to why
ssh failed. This commit therefore dumps out ssh's exit code, stdout,
and stderr upon ssh failure for diagnostic purposes.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit adds build tests of the individual RCU Tasks flavors in
order to detect inadvertent dependencies among the flavors.
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Currently, kvm-recheck.sh will print out any .config errors with messages
of the form:
:CONFIG_TASKS_TRACE_RCU=y: improperly set
However, if these are the only errors, the resulting exit code will
declare the run successful. This commit therefore causes kvm-recheck.sh
to record .config errors in the results directory in a file named
ConfigFragment.diags and also returns a non-zero error code in that case.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Testing building of a given RCU Tasks flavor with the other two
flavors disabled requires checking that the other two flavors are in
fact disabled. This commit therefore modifies the scripting to permit
things like "#CHECK#CONFIG_TASKS_TRACE_RCU=n" to be passed into the
kvm.sh script's --kconfig parameter.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
The TASKS03 scenario specifies both CONFIG_RCU_EXPERT=y and
removes #CHECK#CONFIG_RCU_EXPERT=n in order to be consistent with
CONFIG_RCU_EXPERT=y prerequisites.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
In order to (for example) omit the real-time testing that torture.sh would
otherwise carry out, you put "--do-no-rt" on the torture.sh command line.
This works, but it is all too easy to instead type "--no-rt". This is
unambiguous and easier to type, so this commit therefore allows all
"--no-" arguments as synonyms for their "--do-no-" counterparts.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
The CBMC-based formal-verification testing for SRCU was quite the thing
back in 2016, but the problem is that SRCU changes too quickly for the
scripting to keep up. In addition, more recently, SRCU's grace-period
ordering has been formally modeled by a group of Linux-kernel memory-model
litmus tests.
This commit therefore removes the pioneering formal-verification tests.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Now that the BOOTPARAM_HOTPLUG_CPU0 Kconfig option is in the process of
being removed, it is time to remove rcutorture's use of it.
Link: https://lore.kernel.org/lkml/20230414232309.510911744@linutronix.de/
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: <x86@kernel.org>
It is no longer possible to build a kernel with a preemption-disabled
RCU without use of CONFIG_PREEMPT_DYNAMIC=n. This commit therefore
adds CONFIG_PREEMPT_DYNAMIC=n to the scf torture type's NOPREEMPT
scenario file.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
As the number of CPUs increases, the number of outstanding no-wait
smp_call_function() handlers also increases, so that the default of
2G of memory is not always sufficient on 80-CPU systems. This commit
therefore scales the amount of memory specified to qemu based on the
number of CPUs specified to the scftorture test instance.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
It is no longer possible to build a kernel with a preemption-disabled
RCU without use of CONFIG_PREEMPT_DYNAMIC=n. This commit therefore
adds CONFIG_PREEMPT_DYNAMIC=n to the rcuscale torture type's TRACE01
scenario file.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit prints out the CPU time consumed by the grace-period kthread,
if the specified RCU flavor supports this notion.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
It is no longer possible to build a kernel with a preemption-disabled
RCU without use of CONFIG_PREEMPT_DYNAMIC=n. This commit therefore
adds CONFIG_PREEMPT_DYNAMIC=n to the refscale torture type's NOPREEMPT
scenario file.
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
also have a kernel-doc tweak for enums and the long-overdue removal of the
outdated and redundant patch-submission comments at the top of the
MAINTAINERS file.
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Merge tag 'docs-6.5-2' of git://git.lwn.net/linux
Pull mode documentation updates from Jonathan Corbet:
"A half-dozen late arriving docs patches. They are mostly fixes, but we
also have a kernel-doc tweak for enums and the long-overdue removal of
the outdated and redundant patch-submission comments at the top of the
MAINTAINERS file"
* tag 'docs-6.5-2' of git://git.lwn.net/linux:
scripts: kernel-doc: support private / public marking for enums
Documentation: KVM: SEV: add a missing backtick
Documentation: ACPI: fix typo in ssdt-overlays.rst
Fix documentation of panic_on_warn
docs: remove the tips on how to submit patches from MAINTAINERS
docs: fix typo in zh_TW and zh_CN translation
The kernel cmdline option panic_on_warn expects an integer, it is not a
plain option as documented. A number of uses in the tree figured this
already, and use panic_on_warn=1 for their purpose.
Adjust a comment which otherwise may mislead people in the future.
Fixes: 9e3961a097 ("kernel: add panic_on_warn")
Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
The qemu argument -enable-kvm is duplicated because the qemu_args bash
variable in kvm-test-1-run.sh already provides it. This commit therefore
removes the ppc64-specific copy in functions.sh.
Signed-off-by: Zhouyi Zhou <zhouzhouyi@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
The BUSTED-BOOST and TREE03 scenarios specify a mythical tree.use_softirq
module parameter, which means a failure to get full test coverage. This
commit therefore corrects the name to rcutree.use_softirq.
Fixes: e2b949d543 ("rcutorture: Make TREE03 use real-time tree.use_softirq setting")
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
o MAINTAINERS files additions and changes.
o Fix hotplug warning in nohz code.
o Tick dependency changes by Zqiang.
o Lazy-RCU shrinker fixes by Zqiang.
o rcu-tasks stall reporting improvements by Neeraj.
o Initial changes for renaming of k[v]free_rcu() to its new k[v]free_rcu_mightsleep()
name for robustness.
o Documentation Updates:
o Significant changes to srcu_struct size.
o Deadlock detection for srcu_read_lock() vs synchronize_srcu() from Boqun.
o rcutorture and rcu-related tool, which are targeted for v6.4 from Boqun's tree.
o Other misc changes.
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Merge tag 'rcu.6.4.april5.2023.3' of git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux
Pull RCU updates from Joel Fernandes:
- Updates and additions to MAINTAINERS files, with Boqun being added to
the RCU entry and Zqiang being added as an RCU reviewer.
I have also transitioned from reviewer to maintainer; however, Paul
will be taking over sending RCU pull-requests for the next merge
window.
- Resolution of hotplug warning in nohz code, achieved by fixing
cpu_is_hotpluggable() through interaction with the nohz subsystem.
Tick dependency modifications by Zqiang, focusing on fixing usage of
the TICK_DEP_BIT_RCU_EXP bitmask.
- Avoid needless calls to the rcu-lazy shrinker for CONFIG_RCU_LAZY=n
kernels, fixed by Zqiang.
- Improvements to rcu-tasks stall reporting by Neeraj.
- Initial renaming of k[v]free_rcu() to k[v]free_rcu_mightsleep() for
increased robustness, affecting several components like mac802154,
drbd, vmw_vmci, tracing, and more.
A report by Eric Dumazet showed that the API could be unknowingly
used in an atomic context, so we'd rather make sure they know what
they're asking for by being explicit:
https://lore.kernel.org/all/20221202052847.2623997-1-edumazet@google.com/
- Documentation updates, including corrections to spelling,
clarifications in comments, and improvements to the srcu_size_state
comments.
- Better srcu_struct cache locality for readers, by adjusting the size
of srcu_struct in support of SRCU usage by Christoph Hellwig.
- Teach lockdep to detect deadlocks between srcu_read_lock() vs
synchronize_srcu() contributed by Boqun.
Previously lockdep could not detect such deadlocks, now it can.
- Integration of rcutorture and rcu-related tools, targeted for v6.4
from Boqun's tree, featuring new SRCU deadlock scenarios, test_nmis
module parameter, and more
- Miscellaneous changes, various code cleanups and comment improvements
* tag 'rcu.6.4.april5.2023.3' of git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux: (71 commits)
checkpatch: Error out if deprecated RCU API used
mac802154: Rename kfree_rcu() to kvfree_rcu_mightsleep()
rcuscale: Rename kfree_rcu() to kfree_rcu_mightsleep()
ext4/super: Rename kfree_rcu() to kfree_rcu_mightsleep()
net/mlx5: Rename kfree_rcu() to kfree_rcu_mightsleep()
net/sysctl: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
lib/test_vmalloc.c: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
tracing: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
misc: vmw_vmci: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
drbd: Rename kvfree_rcu() to kvfree_rcu_mightsleep()
rcu: Protect rcu_print_task_exp_stall() ->exp_tasks access
rcu: Avoid stack overflow due to __rcu_irq_enter_check_tick() being kprobe-ed
rcu-tasks: Report stalls during synchronize_srcu() in rcu_tasks_postscan()
rcu: Permit start_poll_synchronize_rcu_expedited() to be invoked early
rcu: Remove never-set needwake assignment from rcu_report_qs_rdp()
rcu: Register rcu-lazy shrinker only for CONFIG_RCU_LAZY=y kernels
rcu: Fix missing TICK_DEP_MASK_RCU_EXP dependency check
rcu: Fix set/clear TICK_DEP_BIT_RCU_EXP bitmask race
rcu/trace: use strscpy() to instead of strncpy()
tick/nohz: Fix cpu_is_hotpluggable() by checking with nohz subsystem
...
