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alarmtimer: add alarm_restart

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Analogous to hrtimer_restart, restart an alarmtimer after the expires
time has already been updated (as with alarm_forward).

Change-Id: Ia2613bbb467404cb2c35c11efa772bc56294963a
Signed-off-by: Todd Poynor <toddpoynor@google.com>
This commit is contained in:
Todd Poynor
2013-05-08 15:49:18 -07:00
committed by Arve Hjønnevåg
parent 3ab74abdc3
commit 0ccfc3ce82
2 changed files with 13 additions and 0 deletions
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1
include/linux/alarmtimer.h
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@@ -44,6 +44,7 @@ struct alarm {
void alarm_init(struct alarm *alarm, enum alarmtimer_type type,
enum alarmtimer_restart (*function)(struct alarm *, ktime_t));
int alarm_start(struct alarm *alarm, ktime_t start);
void alarm_restart(struct alarm *alarm);
int alarm_try_to_cancel(struct alarm *alarm);
int alarm_cancel(struct alarm *alarm);

12
kernel/time/alarmtimer.c
View File

@@ -324,6 +324,18 @@ int alarm_start(struct alarm *alarm, ktime_t start)
return ret;
}
void alarm_restart(struct alarm *alarm)
{
struct alarm_base *base = &alarm_bases[alarm->type];
unsigned long flags;
spin_lock_irqsave(&base->lock, flags);
hrtimer_set_expires(&alarm->timer, alarm->node.expires);
hrtimer_restart(&alarm->timer);
alarmtimer_enqueue(base, alarm);
spin_unlock_irqrestore(&base->lock, flags);
}
/**
* alarm_try_to_cancel - Tries to cancel an alarm timer
* @alarm: ptr to alarm to be canceled