diff options
| author | Anna-Maria Gleixner <anna-maria@linutronix.de> | 2019-07-31 00:33:50 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2019-08-01 20:51:23 +0200 |
| commit | a125ecc16453a4fe0ba865c7df87b9c722991fdf (patch) | |
| tree | 959dbc9c47895ea4ca3cd06cf95b5a3cbbf081d7 /fs/timerfd.c | |
| parent | 51ae33092bb8320497ec75ddc5ab383d8fafd55c (diff) | |
| download | lwn-a125ecc16453a4fe0ba865c7df87b9c722991fdf.tar.gz lwn-a125ecc16453a4fe0ba865c7df87b9c722991fdf.zip | |
timerfd: 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/20190730223828.600085866@linutronix.de
Diffstat (limited to 'fs/timerfd.c')
| -rw-r--r-- | fs/timerfd.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/timerfd.c b/fs/timerfd.c index 6a6fc8aa1de7..48305ba41e3c 100644 --- a/fs/timerfd.c +++ b/fs/timerfd.c @@ -471,7 +471,11 @@ static int do_timerfd_settime(int ufd, int flags, break; } spin_unlock_irq(&ctx->wqh.lock); - cpu_relax(); + + if (isalarm(ctx)) + hrtimer_cancel_wait_running(&ctx->t.alarm.timer); + else + hrtimer_cancel_wait_running(&ctx->t.tmr); } /* |