Messages in this thread Patch in this message | | | Date | Thu, 1 Aug 2019 09:04:08 -0700 | From | tip-bot for Anna-Maria Gleixner <> | Subject | [tip:timers/core] alarmtimer: Prepare for PREEMPT_RT |
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Commit-ID: 1f8e8bd8b74c8089a43bc5f1f24e4bf0f855d760 Gitweb: https://git.kernel.org/tip/1f8e8bd8b74c8089a43bc5f1f24e4bf0f855d760 Author: Anna-Maria Gleixner <anna-maria@linutronix.de> AuthorDate: Wed, 31 Jul 2019 00:33:49 +0200 Committer: Thomas Gleixner <tglx@linutronix.de> CommitDate: Thu, 1 Aug 2019 17:46:41 +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@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20190730223828.508744705@linutronix.de
--- 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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