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hrtimer: migrate pending list on cpu offline

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Impact: hrtimers which are on the pending list are not migrated at cpu
	offline and can be stale forever

Add the pending list migration when CONFIG_HIGH_RES_TIMERS is enabled

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2008-09-29 14:06:45 +02:00
parent 6ef190cc92
commit 7659e34967
1 changed files with 33 additions and 1 deletions
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34
kernel/hrtimer.c
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@ -1610,10 +1610,36 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
} }
} }
#ifdef CONFIG_HIGH_RES_TIMERS
static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
struct hrtimer_cpu_base *new_base)
{
struct hrtimer *timer;
int raise = 0;
while (!list_empty(&old_base->cb_pending)) {
timer = list_entry(old_base->cb_pending.next,
struct hrtimer, cb_entry);
__remove_hrtimer(timer, timer->base, HRTIMER_STATE_PENDING, 0);
timer->base = &new_base->clock_base[timer->base->index];
list_add_tail(&timer->cb_entry, &new_base->cb_pending);
raise = 1;
}
return raise;
}
#else
static int migrate_hrtimer_pending(struct hrtimer_cpu_base *old_base,
struct hrtimer_cpu_base *new_base)
{
return 0;
}
#endif
static void migrate_hrtimers(int cpu) static void migrate_hrtimers(int cpu)
{ {
struct hrtimer_cpu_base *old_base, *new_base; struct hrtimer_cpu_base *old_base, *new_base;
int i; int i, raise = 0;
BUG_ON(cpu_online(cpu)); BUG_ON(cpu_online(cpu));
old_base = &per_cpu(hrtimer_bases, cpu); old_base = &per_cpu(hrtimer_bases, cpu);
@ -1630,10 +1656,16 @@ static void migrate_hrtimers(int cpu)
&new_base->clock_base[i]); &new_base->clock_base[i]);
} }
if (migrate_hrtimer_pending(old_base, new_base))
raise = 1;
spin_unlock(&old_base->lock); spin_unlock(&old_base->lock);
spin_unlock(&new_base->lock); spin_unlock(&new_base->lock);
local_irq_enable(); local_irq_enable();
put_cpu_var(hrtimer_bases); put_cpu_var(hrtimer_bases);
if (raise)
hrtimer_raise_softirq();
} }
#endif /* CONFIG_HOTPLUG_CPU */ #endif /* CONFIG_HOTPLUG_CPU */