Commit-ID: cab46ec655eec1b5dbb0c17a25e19f67c539f00b Gitweb: https://git.kernel.org/tip/cab46ec655eec1b5dbb0c17a25e19f67c539f00b Author: Anna-Maria Gleixner <[email protected]> AuthorDate: Wed, 31 Jul 2019 00:33:51 +0200 Committer: Thomas Gleixner <[email protected]> CommitDate: Thu, 1 Aug 2019 17:46:41 +0200
itimers: Prepare for PREEMPT_RT Use the hrtimer_cancel_wait_running() synchronization mechanism to prevent priority inversion and live locks on PREEMPT_RT. As a benefit the retry loop gains the missing cpu_relax() on !RT. [ tglx: Split out of combo patch ] Signed-off-by: Anna-Maria Gleixner <[email protected]> Signed-off-by: Sebastian Andrzej Siewior <[email protected]> Signed-off-by: Thomas Gleixner <[email protected]> Acked-by: Peter Zijlstra (Intel) <[email protected]> Link: https://lkml.kernel.org/r/[email protected] --- kernel/time/itimer.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/time/itimer.c b/kernel/time/itimer.c index 02068b2d5862..9d26fd4ba4c0 100644 --- a/kernel/time/itimer.c +++ b/kernel/time/itimer.c @@ -213,6 +213,7 @@ again: /* We are sharing ->siglock with it_real_fn() */ if (hrtimer_try_to_cancel(timer) < 0) { spin_unlock_irq(&tsk->sighand->siglock); + hrtimer_cancel_wait_running(timer); goto again; } expires = timeval_to_ktime(value->it_value);
