redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

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
alistair/sunxi64-5.4-dsi
Anna-Maria Gleixner 2019-07-31 00:33:50 +02:00 committed by Thomas Gleixner
parent 51ae33092b
commit a125ecc164
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
fs/timerfd.c
View File

@ -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);
}
/*