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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: 4537b36ee8a290376174b297d6812cba1375ea79
Gitweb: https://git.kernel.org/tip/4537b36ee8a290376174b297d6812cba1375ea79
Author: Vincent Donnefort <vincent.donnefort@arm.com>
AuthorDate: Thu, 25 Feb 2021 08:36:12
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Mon, 01 Mar 2021 18:17:25 +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@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Quentin Perret <qperret@google.com>
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.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);

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