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hrtimer: fixup comments 

Clean up the comments

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Thomas Gleixner 2009-01-05 11:28:23 +01:00 committed by Ingo Molnar
parent a6037b61c2
commit e3f1d88374
1 changed files with 9 additions and 11 deletions
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20
kernel/hrtimer.c
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@ -1143,9 +1143,9 @@ static void __run_hrtimer(struct hrtimer *timer)
spin_lock(&cpu_base->lock);
/*
* Note: We clear the CALLBACK bit after enqueue_hrtimer to avoid
* reprogramming of the event hardware. This happens at the end of this
* function anyway.
* Note: We clear the CALLBACK bit after enqueue_hrtimer and
* we do not reprogramm the event hardware. Happens either in
* hrtimer_start_range_ns() or in hrtimer_interrupt()
*/
if (restart != HRTIMER_NORESTART) {
BUG_ON(timer->state != HRTIMER_STATE_CALLBACK);
@ -1514,14 +1514,12 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
__remove_hrtimer(timer, old_base, HRTIMER_STATE_MIGRATE, 0);
timer->base = new_base;
/*
* Enqueue the timers on the new cpu, but do not reprogram
* the timer as that would enable a deadlock between
* hrtimer_enqueue_reprogramm() running the timer and us still
* holding a nested base lock.
*
* Instead we tickle the hrtimer interrupt after the migration
* is done, which will run all expired timers and re-programm
* the timer device.
* Enqueue the timers on the new cpu. This does not
* reprogram the event device in case the timer
* expires before the earliest on this CPU, but we run
* hrtimer_interrupt after we migrated everything to
* sort out already expired timers and reprogram the
* event device.
*/
enqueue_hrtimer(timer, new_base);