X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=kernel%2Ftime%2Ftick-sched.c;h=727c1ae0517ae68f02b6ba6fa0830b45a6213aab;hb=36ec891895020f3bc9953c8b11d079c6d77d76bd;hp=0581c11fe6c6765121a84f531475e0e3c78809b3;hpb=fdc76bf9b62446c9d4b00e0d355c3212b4f1b13b;p=linux-2.6-omap-h63xx.git

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 0581c11fe6c..727c1ae0517 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -567,11 +567,21 @@ static void tick_nohz_switch_to_nohz(void)
 static void tick_nohz_kick_tick(int cpu)
 {
 	struct tick_sched *ts = &per_cpu(tick_cpu_sched, cpu);
+	ktime_t delta, now;
 
 	if (!ts->tick_stopped)
 		return;
 
-	tick_nohz_restart(ts, ktime_get());
+	/*
+	 * Do not touch the tick device, when the next expiry is either
+	 * already reached or less/equal than the tick period.
+	 */
+	now = ktime_get();
+	delta =	ktime_sub(ts->sched_timer.expires, now);
+	if (delta.tv64 <= tick_period.tv64)
+		return;
+
+	tick_nohz_restart(ts, now);
 }
 
 #else