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UPSTREAM: tick/common: Touch watchdog in tick_unfreeze() on all CPUs

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Suspend to IDLE invokes tick_unfreeze() on resume. tick_unfreeze() on the
first resuming CPU resumes timekeeping, which also has the side effect of
resetting the softlockup watchdog on this CPU.

But on the secondary CPUs the watchdog is not reset in the resume /
unfreeze() path, which can result in false softlockup warnings on those
CPUs depending on the time spent in suspend.

Prevent this by clearing the softlock watchdog in the unfreeze path also
on the secondary resuming CPUs.

[ tglx: Massaged changelog ]

Signed-off-by: Chunyan Zhang <chunyan.zhang@unisoc.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20200110083902.27276-1-chunyan.zhang@unisoc.com
Bug: 173341055
(cherry picked from commit 5167c506d62dd9ffab73eba23c79b0a8845c9fe1)
Signed-off-by: Chunyan Zhang <zhang.lyra@gmail.com>
Change-Id: Iab440b4137726811fce76f3636a4cf8bafc2c202
This commit is contained in:
Chunyan Zhang 2020-01-10 16:39:02 +08:00 committed by Todd Kjos
parent 70145df882
commit 5eaa11cf0d
1 changed files with 2 additions and 0 deletions
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2
kernel/time/tick-common.c
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@ -11,6 +11,7 @@
#include <linux/err.h>
#include <linux/hrtimer.h>
#include <linux/interrupt.h>
#include <linux/nmi.h>
#include <linux/percpu.h>
#include <linux/profile.h>
#include <linux/sched.h>
@ -558,6 +559,7 @@ void tick_unfreeze(void)
trace_suspend_resume(TPS("timekeeping_freeze"),
smp_processor_id(), false);
} else {
touch_softlockup_watchdog();
tick_resume_local();
}