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

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Date:   Fri, 01 May 2020 18:22:07 -0000
From:   "tip-bot2 for Muchun Song" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Muchun Song <songmuchun@...edance.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        x86 <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: [tip: sched/core] sched/fair: Use __this_cpu_read() in wake_wide()

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

Commit-ID:     17c891ab349138e8d8a59ca2700f42ce8af96f4e
Gitweb:        https://git.kernel.org/tip/17c891ab349138e8d8a59ca2700f42ce8af96f4e
Author:        Muchun Song <songmuchun@...edance.com>
AuthorDate:    Tue, 21 Apr 2020 22:41:23 +08:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Thu, 30 Apr 2020 20:14:41 +02:00

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>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Link: https://lkml.kernel.org/r/20200421144123.33580-1-songmuchun@bytedance.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 cd7fd7e..46b7bd4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5718,7 +5718,7 @@ 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);