[PATCH] sched/idle: Prevent stopping the tick when there is no cpuidle driver

[Anna-Maria Behnsen]

When there is no cpuidle driver, the system tries to stop the tick even if
the system is fully loaded. But stopping the tick is not for free and it
decreases performance on a fully loaded system. As there is no (cpuidle)
framework which brings CPU in a power saving state when nothing needs to be
done, there is also no power saving benefit when stopping the tick.

Therefore do not stop the tick when there is no cpuidle driver.

Signed-off-by: Anna-Maria Behnsen <anna-maria@xxxxxxxxxxxxx>
---
 kernel/sched/idle.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c
index 565f8374ddbb..fd111686aaf3 100644
--- a/kernel/sched/idle.c
+++ b/kernel/sched/idle.c
@@ -165,8 +165,6 @@ static void cpuidle_idle_call(void)
 	 */
 
 	if (cpuidle_not_available(drv, dev)) {
-		tick_nohz_idle_stop_tick();
-
 		default_idle_call();
 		goto exit_idle;
 	}
-- 
2.39.2