From 055289d1bb176d22935bd3a91082f35adfba80fe Mon Sep 17 00:00:00 2001
From: Vincent Guittot <vincent.guittot@linaro.org>
Date: Tue, 28 Sep 2021 12:35:44 +0200
Subject: [PATCH] sched/fair: Removed useless update of p->recent_used_cpu

References: bsc#1189999 (Scheduler functional and performance backports)
Patch-mainline: v5.16-rc1
Git-commit: a7ba894821b6ade7bb420455f87020b2838d6180

Since commit 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu"),
p->recent_used_cpu is unconditionnaly set with prev.

Fixes: 89aafd67f28c ("sched/fair: Use prev instead of new target as recent_used_cpu")
Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Link: https://lkml.kernel.org/r/20210928103544.27489-1-vincent.guittot@linaro.org
Signed-off-by: Mel Gorman <mgorman@suse.de>
---
 kernel/sched/fair.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 74f54ccc344d..dd0867a2edc4 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -6483,11 +6483,6 @@ static int select_idle_sibling(struct task_struct *p, int prev, int target)
 	    (available_idle_cpu(recent_used_cpu) || sched_idle_cpu(recent_used_cpu)) &&
 	    cpumask_test_cpu(p->recent_used_cpu, p->cpus_ptr) &&
 	    asym_fits_capacity(task_util, recent_used_cpu)) {
-		/*
-		 * Replace recent_used_cpu with prev as it is a potential
-		 * candidate for the next wake:
-		 */
-		p->recent_used_cpu = prev;
 		return recent_used_cpu;
 	}