diff options
Diffstat (limited to 'kernel/time/hrtimer.c')
| -rw-r--r-- | kernel/time/hrtimer.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index 5af758473488..bdcbf3036a40 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1468,6 +1468,7 @@ static void __hrtimer_init(struct hrtimer *timer, clockid_t clock_id, base += hrtimer_clockid_to_base(clock_id); timer->is_soft = softtimer; timer->is_hard = !!(mode & HRTIMER_MODE_HARD); + timer->is_chill = !!(mode & HRTIMER_MODE_CHILL); timer->base = &cpu_base->clock_base[base]; timerqueue_init(&timer->node); } @@ -1834,7 +1835,7 @@ static enum hrtimer_restart hrtimer_wakeup(struct hrtimer *timer) t->task = NULL; if (task) - wake_up_process(task); + wake_up_state(task, timer->is_chill ? TASK_RTLOCK_WAIT : TASK_NORMAL); return HRTIMER_NORESTART; } @@ -2052,6 +2053,34 @@ SYSCALL_DEFINE2(nanosleep_time32, struct old_timespec32 __user *, rqtp, } #endif +#ifdef CONFIG_PREEMPT_RT +/* + * Sleep for 1 ms in hope whoever holds what we want will let it go. + */ +void cpu_chill(void) +{ + unsigned int freeze_flag = current->flags & PF_NOFREEZE; + ktime_t chill_time; + + local_irq_disable(); + current_save_and_set_rtlock_wait_state(); + local_irq_enable(); + + chill_time = ktime_set(0, NSEC_PER_MSEC); + + current->flags |= PF_NOFREEZE; + schedule_hrtimeout(&chill_time, + HRTIMER_MODE_REL_HARD| HRTIMER_MODE_CHILL); + if (!freeze_flag) + current->flags &= ~PF_NOFREEZE; + + local_irq_disable(); + current_restore_rtlock_saved_state(); + local_irq_enable(); +} +EXPORT_SYMBOL(cpu_chill); +#endif + /* * Functions related to boot-time initialization: */ |