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>
Signed-off-by: Ingo Molnar <mingo@kernel.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

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index b994db9..7b2fac0 100644 (file)
--- 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);