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Diffstat (limited to 'kernel/time/posix-timers.c')
| -rw-r--r-- | kernel/time/posix-timers.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c index 9e377830cc10..0ec5b7a1d769 100644 --- a/kernel/time/posix-timers.c +++ b/kernel/time/posix-timers.c @@ -810,6 +810,12 @@ static void common_timer_wait_running(struct k_itimer *timer) hrtimer_cancel_wait_running(&timer->it.real.timer); } +/* + * On PREEMPT_RT this prevent priority inversion against softirq kthread in + * case it gets preempted while executing a timer callback. See comments in + * hrtimer_cancel_wait_running. For PREEMPT_RT=n this just results in a + * cpu_relax(). + */ static struct k_itimer *timer_wait_running(struct k_itimer *timer, unsigned long *flags) { |