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-rw-r--r--kernel/timer.c19
1 files changed, 16 insertions, 3 deletions
diff --git a/kernel/timer.c b/kernel/timer.c
index 797cccb8643..440048acaea 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -695,15 +695,28 @@ static unsigned long cmp_next_hrtimer_event(unsigned long now,
{
ktime_t hr_delta = hrtimer_get_next_event();
struct timespec tsdelta;
+ unsigned long delta;
if (hr_delta.tv64 == KTIME_MAX)
return expires;
- if (hr_delta.tv64 <= TICK_NSEC)
- return now;
+ /*
+ * Expired timer available, let it expire in the next tick
+ */
+ if (hr_delta.tv64 <= 0)
+ return now + 1;
tsdelta = ktime_to_timespec(hr_delta);
- now += timespec_to_jiffies(&tsdelta);
+ delta = timespec_to_jiffies(&tsdelta);
+ /*
+ * Take rounding errors in to account and make sure, that it
+ * expires in the next tick. Otherwise we go into an endless
+ * ping pong due to tick_nohz_stop_sched_tick() retriggering
+ * the timer softirq
+ */
+ if (delta < 1)
+ delta = 1;
+ now += delta;
if (time_before(now, expires))
return now;
return expires;