linux-kernel - [PATCH v2 2/2] sched/fair: use lsub_positive in cpu_util

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Date:   Thu, 25 Feb 2021 08:36:12 +0000
From:   vincent.donnefort@....com
To:     peterz@...radead.org, mingo@...hat.com, vincent.guittot@...aro.org
Cc:     dietmar.eggemann@....com, linux-kernel@...r.kernel.org,
        qperret@...gle.com, patrick.bellasi@...bug.net,
        valentin.schneider@....com,
        Vincent Donnefort <vincent.donnefort@....com>
Subject: [PATCH v2 2/2] sched/fair: use lsub_positive in cpu_util_next()

From: Vincent Donnefort <vincent.donnefort@....com>

The sub_positive local version is saving an explicit load-store and is
enough for the cpu_util_next() usage.

Signed-off-by: Vincent Donnefort <vincent.donnefort@....com>

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 146ac9fec4b6..1364f8b95214 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6525,7 +6525,7 @@ static unsigned long cpu_util_next(int cpu, struct task_struct *p, int dst_cpu)
 	 * util_avg should already be correct.
 	 */
 	if (task_cpu(p) == cpu && dst_cpu != cpu)
-		sub_positive(&util, task_util(p));
+		lsub_positive(&util, task_util(p));
 	else if (task_cpu(p) != cpu && dst_cpu == cpu)
 		util += task_util(p);
 
-- 
2.25.1