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authorThomas Gleixner <tglx@linutronix.de>2008-09-29 14:06:45 +0200
committerThomas Gleixner <tglx@linutronix.de>2008-09-29 17:09:13 +0200
commit7659e349672bb0d378ef8d7d62bae4c53d2bdd18 (patch)
treed1cf1862c214dc9eb93b46cbc3d123a465ce7b4f /kernel
parent6ef190cc92e33565accff6a320f0e7d90480bfe7 (diff)
hrtimer: migrate pending list on cpu offline
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/hrtimer.c34
1 files changed, 33 insertions, 1 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index b8e4dce80a74..580bc66ae136 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -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)
{
struct hrtimer_cpu_base *old_base, *new_base;
- int i;
+ int i, raise = 0;
BUG_ON(cpu_online(cpu));
old_base = &per_cpu(hrtimer_bases, cpu);
@@ -1630,10 +1656,16 @@ static void migrate_hrtimers(int cpu)
&new_base->clock_base[i]);
}
+ if (migrate_hrtimer_pending(old_base, new_base))
+ raise = 1;
+
spin_unlock(&old_base->lock);
spin_unlock(&new_base->lock);
local_irq_enable();
put_cpu_var(hrtimer_bases);
+
+ if (raise)
+ hrtimer_raise_softirq();
}
#endif /* CONFIG_HOTPLUG_CPU */