Petr Mladek 9f113bf760 watchdog: fix barriers when printing backtraces from all CPUs ... Any parallel softlockup reports are skipped when one CPU is already printing backtraces from all CPUs. The exclusive rights are synchronized using one bit in soft_lockup_nmi_warn. There is also one memory barrier that does not make much sense. Use two barriers on the right location to prevent mixing two reports. [pmladek@suse.com: use bit lock operations to prevent multiple soft-lockup reports] Link: https://lkml.kernel.org/r/YFSVsLGVWMXTvlbk@alley Link: https://lkml.kernel.org/r/20210311122130.6788-6-pmladek@suse.com Signed-off-by: Petr Mladek <pmladek@suse.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Ingo Molnar <mingo@kernel.org> Cc: Laurence Oberman <loberman@redhat.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincent Whitchurch <vincent.whitchurch@axis.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2021-04-30 11:20:36 -07:00
..
bpf	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
cgroup	cgroup: use tsk->in_iowait instead of delayacct_is_task_waiting_on_io()	2021-04-16 16:49:37 -04:00
configs	kconfig: do not use allnoconfig_y option	2021-04-14 15:22:49 +09:00
debug	printk changes for 5.13	2021-04-27 18:09:44 -07:00
dma	Merge branch 'stable/for-linus-5.12' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/swiotlb	2021-02-26 13:59:32 -08:00
entry	A trivial cleanup of typo fixes.	2021-04-26 09:41:15 -07:00
events	perf: Extend PERF_TYPE_HARDWARE and PERF_TYPE_HW_CACHE	2021-04-19 20:03:29 +02:00
gcov	Revert "gcov: clang: fix clang-11+ build"	2021-04-19 15:08:49 -07:00
irq	The usual updates from the irq departement:	2021-04-26 09:43:16 -07:00
kcsan	kcsan: Fix printk format string	2021-04-22 14:36:03 +02:00
livepatch	Livepatching changes for 5.13	2021-04-27 18:14:38 -07:00
locking	Locking changes for this cycle were:	2021-04-28 12:37:53 -07:00
power	PM: sleep: fix typos in comments	2021-04-08 19:37:21 +02:00
printk	kernel/printk.c: Fixed mundane typos	2021-03-30 15:34:17 +02:00
rcu	Merge branches 'bitmaprange.2021.03.08a', 'fixes.2021.03.15a', 'kvfree_rcu.2021.03.08a', 'mmdumpobj.2021.03.08a', 'nocb.2021.03.15a', 'poll.2021.03.24a', 'rt.2021.03.08a', 'tasks.2021.03.08a', 'torture.2021.03.08a' and 'torturescript.2021.03.22a' into HEAD	2021-03-24 17:20:18 -07:00
sched	Scheduler updates for this cycle are:	2021-04-28 13:33:57 -07:00
time	Power management updates for 5.13-rc1	2021-04-26 15:10:25 -07:00
trace	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
.gitignore
acct.c
async.c
audit.c	lsm: separate security_task_getsecid() into subjective and objective variants	2021-03-22 15:23:32 -04:00
audit.h	audit: avoid -Wempty-body warning	2021-03-24 12:11:48 -04:00
audit_fsnotify.c
audit_tree.c
audit_watch.c
auditfilter.c	lsm: separate security_task_getsecid() into subjective and objective variants	2021-03-22 15:23:32 -04:00
auditsc.c	audit/stable-5.13 PR 20210426	2021-04-27 13:50:58 -07:00
backtracetest.c
bounds.c
capability.c
cfi.c	add support for Clang CFI	2021-04-08 16:04:20 -07:00
compat.c
configs.c
context_tracking.c
cpu.c	cpumask/hotplug: Fix cpu_dying() state tracking	2021-04-21 13:55:43 +02:00
cpu_pm.c
crash_core.c
crash_dump.c
cred.c
delayacct.c
dma.c
exec_domain.c
exit.c	signal: Allow tasks to cache one sigqueue struct	2021-04-14 18:04:08 +02:00
extable.c
fail_function.c
fork.c	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
freezer.c	Revert "kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing"	2021-03-27 14:09:10 -06:00
futex.c	Linux 5.12-rc5	2021-03-29 15:56:48 +02:00
gen_kheaders.sh	kbuild: redo fake deps at include/config/*.h	2021-04-25 05:26:10 +09:00
groups.c
hung_task.c
iomem.c
irq_work.c
jump_label.c	static_call: Fix static_call_update() sanity check	2021-03-19 13:16:44 +01:00
kallsyms.c	kallsyms: strip ThinLTO hashes from static functions	2021-04-08 16:04:21 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c
kexec.c
kexec_core.c
kexec_elf.c
kexec_file.c
kexec_internal.h
kheaders.c
kmod.c
kprobes.c
ksysfs.c
kthread.c	Scheduler updates for this cycle are:	2021-04-28 13:33:57 -07:00
latencytop.c
Makefile	add support for Clang CFI	2021-04-08 16:04:20 -07:00
module-internal.h
module.c	add support for Clang CFI	2021-04-08 16:04:20 -07:00
module_signature.c
module_signing.c
notifier.c
nsproxy.c
padata.c
panic.c
params.c
pid.c
pid_namespace.c
profile.c	kernel: Initialize cpumask before parsing	2021-04-10 13:35:54 +02:00
ptrace.c	Linux 5.12-rc8	2021-04-20 10:13:58 +02:00
range.c
reboot.c	Revert "PM: ACPI: reboot: Use S5 for reboot"	2021-03-18 16:58:02 +01:00
regset.c
relay.c
resource.c
resource_kunit.c
rseq.c	rseq: Optimise rseq_get_rseq_cs() and clear_rseq_cs()	2021-04-14 18:04:09 +02:00
scftorture.c
scs.c
seccomp.c	seccomp: Fix "cacheable" typo in comments	2021-03-30 22:34:30 -07:00
signal.c	Scheduler updates for this cycle are:	2021-04-28 13:33:57 -07:00
smp.c	Merge branch 'locking/core' into x86/mm, to resolve conflict	2021-03-06 13:00:58 +01:00
smpboot.c
smpboot.h
softirq.c	RCU changes for this cycle were:	2021-04-28 12:00:13 -07:00
stackleak.c
stacktrace.c
static_call.c	static_call: Fix unused variable warn w/o MODULE	2021-04-09 13:22:12 +02:00
stop_machine.c	stop_machine: Add caller debug info to queue_stop_cpus_work	2021-03-23 16:01:58 +01:00
sys.c	arm64: Introduce prctl(PR_PAC_{SET,GET}_ENABLED_KEYS)	2021-04-13 17:31:44 +01:00
sys_ni.c	quota: wire up quotactl_path	2021-03-17 15:51:17 +01:00
sysctl-test.c
sysctl.c	Networking changes for 5.13.	2021-04-29 11:57:23 -07:00
task_work.c	task_work: add helper for more targeted task_work canceling	2021-04-11 19:30:25 -06:00
taskstats.c
test_kprobes.c
torture.c	torture: Replace torture_init_begin string with %s	2021-03-08 14:22:28 -08:00
tracepoint.c
tsacct.c
ucount.c	fanotify: configurable limits via sysfs	2021-03-16 16:49:31 +01:00
uid16.c
uid16.h
umh.c
up.c	smp: Inline on_each_cpu_cond() and on_each_cpu()	2021-03-06 12:59:10 +01:00
user-return-notifier.c
user.c
user_namespace.c	capabilities: require CAP_SETFCAP to map uid 0	2021-04-20 14:28:33 -07:00
usermode_driver.c	bpf: Fix umd memory leak in copy_process()	2021-03-19 22:23:19 +01:00
utsname.c
utsname_sysctl.c
watch_queue.c
watchdog.c	watchdog: fix barriers when printing backtraces from all CPUs	2021-04-30 11:20:36 -07:00
watchdog_hld.c
workqueue.c	CFI on arm64 series for v5.13-rc1	2021-04-27 10:16:46 -07:00
workqueue_internal.h