linux-kernel - [PATCH] sched/fair: Use __this_cpu_read() in wake

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Message-Id: <20200421144123.33580-1-songmuchun@bytedance.com>
Date:   Tue, 21 Apr 2020 22:41:23 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     mingo@...nel.org, peterz@...radead.org, juri.lelli@...hat.com,
        vincent.guittot@...aro.org, dietmar.eggemann@....com,
        rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de
Cc:     linux-kernel@...r.kernel.org,
        Muchun Song <songmuchun@...edance.com>
Subject: [PATCH] sched/fair: Use __this_cpu_read() in wake_wide()

The code is executed with preemption(and interrupts) disabled,
so it's safe to use __this_cpu_write().

Signed-off-by: Muchun Song <songmuchun@...edance.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 870853c47b63c..356660ec4ff3e 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5705,7 +5705,7 @@ static int wake_wide(struct task_struct *p)
 {
 	unsigned int master = current->wakee_flips;
 	unsigned int slave = p->wakee_flips;
-	int factor = this_cpu_read(sd_llc_size);
+	int factor = __this_cpu_read(sd_llc_size);
 
 	if (master < slave)
 		swap(master, slave);
-- 
2.11.0