Commit-ID: 51ae33092bb8320497ec75ddc5ab383d8fafd55c Gitweb: https://git.kernel.org/tip/51ae33092bb8320497ec75ddc5ab383d8fafd55c Author: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx> AuthorDate: Wed, 31 Jul 2019 00:33:49 +0200 Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx> CommitDate: Thu, 1 Aug 2019 20:51:23 +0200 alarmtimer: Prepare for PREEMPT_RT Use the hrtimer_cancel_wait_running() synchronization mechanism to prevent priority inversion and live locks on PREEMPT_RT. [ tglx: Split out of combo patch ] Signed-off-by: Anna-Maria Gleixner <anna-maria@xxxxxxxxxxxxx> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx> Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Link: https://lkml.kernel.org/r/20190730223828.508744705@xxxxxxxxxxxxx --- kernel/time/alarmtimer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/time/alarmtimer.c b/kernel/time/alarmtimer.c index 57518efc3810..36947449dba2 100644 --- a/kernel/time/alarmtimer.c +++ b/kernel/time/alarmtimer.c @@ -432,7 +432,7 @@ int alarm_cancel(struct alarm *alarm) int ret = alarm_try_to_cancel(alarm); if (ret >= 0) return ret; - cpu_relax(); + hrtimer_cancel_wait_running(&alarm->timer); } } EXPORT_SYMBOL_GPL(alarm_cancel);
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