Merge branch 'linus' into cpus4096-for-linus

[linux-2.6-omap-h63xx.git] / kernel / time / tick-sched.c

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index d63008b09a4cee1cfc71b5e53e929b39312afff0..beef7ccdf842f3cea9994c19b879baa06f3e94f5 100644 (file)
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -48,6 +48,13 @@ static void tick_do_update_jiffies64(ktime_t now)
        unsigned long ticks = 0;
        ktime_t delta;
 
+       /*
+        * Do a quick check without holding xtime_lock:
+        */
+       delta = ktime_sub(now, last_jiffies_update);
+       if (delta.tv64 < tick_period.tv64)
+               return;
+
        /* Reevalute with xtime_lock held */
        write_seqlock(&xtime_lock);
 
@@ -228,6 +235,7 @@ void tick_nohz_stop_sched_tick(void)
                               local_softirq_pending());
                        ratelimit++;
                }
+               goto end;
        }
 
        ts->idle_calls++;