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-rw-r--r--kernel/hrtimer.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 9002958..126b980 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -206,8 +206,19 @@ switch_hrtimer_base(struct hrtimer *timer, struct hrtimer_clock_base *base,
#if defined(CONFIG_NO_HZ) && defined(CONFIG_SMP)
if (!pinned && get_sysctl_timer_migration() && idle_cpu(cpu)) {
preferred_cpu = get_nohz_load_balancer();
- if (preferred_cpu >= 0)
- cpu = preferred_cpu;
+ if (preferred_cpu >= 0) {
+ /*
+ * We must not check the expiry value when
+ * preferred_cpu is the current cpu. If base
+ * != new_base we would loop forever when the
+ * timer expires before the current programmed
+ * next timer event.
+ */
+ if (preferred_cpu != cpu)
+ cpu = preferred_cpu;
+ else
+ preferred_cpu = -1;
+ }
}
#endif
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