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-rw-r--r--kernel/hrtimer.c28
1 files changed, 25 insertions, 3 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 580bc66..ac2f6d6 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -1591,11 +1591,12 @@ static void __cpuinit init_hrtimers_cpu(int cpu)
#ifdef CONFIG_HOTPLUG_CPU
-static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
+static int migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
struct hrtimer_clock_base *new_base)
{
struct hrtimer *timer;
struct rb_node *node;
+ int raise = 0;
while ((node = rb_first(&old_base->active))) {
timer = rb_entry(node, struct hrtimer, node);
@@ -1607,7 +1608,27 @@ static void migrate_hrtimer_list(struct hrtimer_clock_base *old_base,
* Enqueue the timer. Allow reprogramming of the event device
*/
enqueue_hrtimer(timer, new_base, 1);
+
+#ifdef CONFIG_HIGH_RES_TIMERS
+ /*
+ * Happens with high res enabled when the timer was
+ * already expired and the callback mode is
+ * HRTIMER_CB_IRQSAFE_NO_SOFTIRQ
+ * (hrtimer_sleeper). The enqueue code does not move
+ * them to the soft irq pending list for
+ * performance/latency reasons, but in the migration
+ * state, we need to do that otherwise we end up with
+ * a stale timer.
+ */
+ if (timer->state == HRTIMER_STATE_INACTIVE) {
+ timer->state = HRTIMER_STATE_PENDING;
+ list_add_tail(&timer->cb_entry,
+ &new_base->cpu_base->cb_pending);
+ raise = 1;
+ }
+#endif
}
+ return raise;
}
#ifdef CONFIG_HIGH_RES_TIMERS
@@ -1652,8 +1673,9 @@ static void migrate_hrtimers(int cpu)
spin_lock_nested(&old_base->lock, SINGLE_DEPTH_NESTING);
for (i = 0; i < HRTIMER_MAX_CLOCK_BASES; i++) {
- migrate_hrtimer_list(&old_base->clock_base[i],
- &new_base->clock_base[i]);
+ if (migrate_hrtimer_list(&old_base->clock_base[i],
+ &new_base->clock_base[i]))
+ raise = 1;
}
if (migrate_hrtimer_pending(old_base, new_base))
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