Commit 51ae3309 authored Jul 31, 2019 by Anna-Maria Gleixner Committed by Thomas Gleixner Aug 01, 2019

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

parent 850377a8

kernel/time/alarmtimer.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -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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