From: Muchun Song <songmuchun@bytedance.com>
Date: Tue, 21 Apr 2020 14:41:23 +0000 (+0800)
Subject: sched/fair: Use __this_cpu_read() in wake_wide()
X-Git-Tag: Ubuntu-5.10.0-12.13~2745^2~24
X-Git-Url: https://git.proxmox.com/?a=commitdiff_plain;h=17c891ab349138e8d8a59ca2700f42ce8af96f4e;p=mirror_ubuntu-hirsute-kernel.git

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@bytedance.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20200421144123.33580-1-songmuchun@bytedance.com
---

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cd7fd7e2b579..46b7bd41573f 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);