Merge branch 'upstream-linus' of master.kernel.org:/pub/scm/linux/kernel/git/jgarzik...

[pandora-kernel.git] / kernel / timer.c

diff --git a/kernel/timer.c b/kernel/timer.c
index 797cccb..440048a 100644 (file)
--- 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;