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Merge branch 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'timers-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  timers: Consider slack value in mod_timer()
  clockevents: Handle empty cpumask gracefully
This commit is contained in:
Linus Torvalds 2011-06-07 19:07:22 -07:00
commit ecff4fcc7b
2 changed files with 11 additions and 9 deletions
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5
kernel/time/clockevents.c
View File

@ -182,7 +182,10 @@ void clockevents_register_device(struct clock_event_device *dev)
unsigned long flags;
BUG_ON(dev->mode != CLOCK_EVT_MODE_UNUSED);
BUG_ON(!dev->cpumask);
if (!dev->cpumask) {
WARN_ON(num_possible_cpus() > 1);
dev->cpumask = cpumask_of(smp_processor_id());
}
raw_spin_lock_irqsave(&clockevents_lock, flags);

15
kernel/timer.c
View File

@ -749,16 +749,15 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
unsigned long expires_limit, mask;
int bit;
expires_limit = expires;
if (timer->slack >= 0) {
expires_limit = expires + timer->slack;
} else {
unsigned long now = jiffies;
long delta = expires - jiffies;
/* No slack, if already expired else auto slack 0.4% */
if (time_after(expires, now))
expires_limit = expires + (expires - now)/256;
if (delta < 256)
return expires;
expires_limit = expires + delta / 256;
}
mask = expires ^ expires_limit;
if (mask == 0)
@ -795,6 +794,8 @@ unsigned long apply_slack(struct timer_list *timer, unsigned long expires)
*/
int mod_timer(struct timer_list *timer, unsigned long expires)
{
expires = apply_slack(timer, expires);
/*
* This is a common optimization triggered by the
* networking code - if the timer is re-modified
@ -803,8 +804,6 @@ int mod_timer(struct timer_list *timer, unsigned long expires)
if (timer_pending(timer) && timer->expires == expires)
return 1;
expires = apply_slack(timer, expires);
return __mod_timer(timer, expires, false, TIMER_NOT_PINNED);
}
EXPORT_SYMBOL(mod_timer);