linux-kernel - [tip: sched/core] sched/fair: use lsub_positive in cpu_util

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Date:   Sat, 06 Mar 2021 11:42:21 -0000
From:   "tip-bot2 for Vincent Donnefort" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Vincent Donnefort <vincent.donnefort@....com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Quentin Perret <qperret@...gle.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: sched/core] sched/fair: use lsub_positive in cpu_util_next()

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     736cc6b31102236a55470c72523ed0a65eb3f804
Gitweb:        https://git.kernel.org/tip/736cc6b31102236a55470c72523ed0a65eb3f804
Author:        Vincent Donnefort <vincent.donnefort@....com>
AuthorDate:    Thu, 25 Feb 2021 08:36:12 
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Sat, 06 Mar 2021 12:40:22 +01:00

sched/fair: use lsub_positive in cpu_util_next()

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Reviewed-by: Quentin Perret <qperret@...gle.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@....com>
Link: https://lkml.kernel.org/r/20210225083612.1113823-3-vincent.donnefort@arm.com
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b994db9..7b2fac0 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6471,7 +6471,7 @@ 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);