linux-kernel - [PATCH] sched/core: Remove double update_max

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Date:   Mon, 23 Sep 2019 10:30:17 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org
Cc:     mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        tglx@...utronix.de
Subject: [PATCH] sched/core: Remove double update_max_interval() call on CPU startup

update_max_interval() is called in both CPUHP_AP_SCHED_STARTING's startup
and teardown callbacks, but it turns out it's also called at the end of
the startup callback of CPUHP_AP_ACTIVE (which is further down the
startup sequence).

There's no point in repeating this interval update in the startup sequence
since the CPU will remain online until it goes down the teardown path.

Remove the redundant call in sched_cpu_activate() (CPUHP_AP_ACTIVE).

Signed-off-by: Valentin Schneider <valentin.schneider@....com>
---
 kernel/sched/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 87b84a726db4..6b94e71f659e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -6418,9 +6418,6 @@ int sched_cpu_activate(unsigned int cpu)
 	}
 	rq_unlock_irqrestore(rq, &rf);

-	update_max_interval();
-
 	return 0;
 }

--
2.22.0