diff options
Diffstat (limited to 'kernel/time/hrtimer.c')
-rw-r--r-- | kernel/time/hrtimer.c | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c index aa9d2a2b1210..a242353d7b6a 100644 --- a/kernel/time/hrtimer.c +++ b/kernel/time/hrtimer.c @@ -1788,3 +1788,74 @@ int __sched schedule_hrtimeout(ktime_t *expires, return schedule_hrtimeout_range(expires, 0, mode); } EXPORT_SYMBOL_GPL(schedule_hrtimeout); + +/* + * As per schedule_hrtimeout but taskes a millisecond value and returns how + * many milliseconds are left. + */ +long __sched schedule_msec_hrtimeout(long timeout) +{ + struct hrtimer_sleeper t; + int delta, secs, jiffs; + ktime_t expires; + + if (!timeout) { + __set_current_state(TASK_RUNNING); + return 0; + } + + jiffs = msecs_to_jiffies(timeout); + /* + * If regular timer resolution is adequate or hrtimer resolution is not + * (yet) better than Hz, as would occur during startup, use regular + * timers. + */ + if (jiffs > 4 || hrtimer_resolution >= NSEC_PER_SEC / HZ) + return schedule_timeout(jiffs); + + secs = timeout / 1000; + delta = (timeout % 1000) * NSEC_PER_MSEC; + expires = ktime_set(secs, delta); + + hrtimer_init_on_stack(&t.timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hrtimer_set_expires_range_ns(&t.timer, expires, delta); + + hrtimer_init_sleeper(&t, current); + + hrtimer_start_expires(&t.timer, HRTIMER_MODE_REL); + + if (likely(t.task)) + schedule(); + + hrtimer_cancel(&t.timer); + destroy_hrtimer_on_stack(&t.timer); + + __set_current_state(TASK_RUNNING); + + expires = hrtimer_expires_remaining(&t.timer); + timeout = ktime_to_ms(expires); + return timeout < 0 ? 0 : timeout; +} + +EXPORT_SYMBOL(schedule_msec_hrtimeout); + +long __sched schedule_min_hrtimeout(void) +{ + return schedule_msec_hrtimeout(1); +} + +EXPORT_SYMBOL(schedule_min_hrtimeout); + +long __sched schedule_msec_hrtimeout_interruptible(long timeout) +{ + __set_current_state(TASK_INTERRUPTIBLE); + return schedule_msec_hrtimeout(timeout); +} +EXPORT_SYMBOL(schedule_msec_hrtimeout_interruptible); + +long __sched schedule_msec_hrtimeout_uninterruptible(long timeout) +{ + __set_current_state(TASK_UNINTERRUPTIBLE); + return schedule_msec_hrtimeout(timeout); +} +EXPORT_SYMBOL(schedule_msec_hrtimeout_uninterruptible); |