nohz: Remove update_ts_time_stat from tick_nohz_start_idle

There is no reason to call update_ts_time_stat from tick_nohz_start_idle
anymore (after e0e37c20 sched: Eliminate the ts->idle_lastupdate field)
when we updated idle_lastupdate unconditionally.

We haven't set idle_active yet and do not provide last_update_time so
the whole call end up being just 2 wasted branches.

Signed-off-by: Michal Hocko <mhocko@suse.cz>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Link: http://lkml.kernel.org/r/1322755222-6951-1-git-send-email-mhocko@suse.cz
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 1 insertions, 5 deletions

diff --git a/kernel/time/tick-sched.c b/kernel/time/tick-sched.c
index 7656642e4b8e..8cfffd9d9ce9 100644
--- a/kernel/time/tick-sched.c
+++ b/kernel/time/tick-sched.c
@@ -182,11 +182,7 @@ static void tick_nohz_stop_idle(int cpu, ktime_t now)
 
 static ktime_t tick_nohz_start_idle(int cpu, struct tick_sched *ts)
 {
-        ktime_t now;
-
-        now = ktime_get();
-
-        update_ts_time_stats(cpu, ts, now, NULL);
+        ktime_t now = ktime_get();
 
         ts->idle_entrytime = now;
         ts->idle_active = 1;