cpuidle: menu: Optimize bucket assignment when next_timer_ns equals KTIME_MAX

Directly assign the last bucket value instead of calling which_bucket()
when next_timer_ns equals KTIME_MAX, the largest possible value that
always falls into the last bucket.

This avoids unnecessary calculations and enhances performance.

Reviewed-by: Christian Loehle <[email protected]>
Signed-off-by: Zhongqiu Han <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Rafael J. Wysocki <[email protected]>

Author: ZhongqiuHan-Qcom

drivers/cpuidle/governors/menu.c

@@ -255,7 +255,7 @@ static int menu_select(struct cpuidle_driver *drv, struct cpuidle_device *dev,
 		 */
 		data->next_timer_ns = KTIME_MAX;
 		delta_tick = TICK_NSEC / 2;
-		data->bucket = which_bucket(KTIME_MAX);
+		data->bucket = BUCKETS - 1;
 	}
 
 	if (unlikely(drv->state_count <= 1 || latency_req == 0) ||