linux-kernel - [PATCH] sched/fair: fix find_idlest

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Date:	Fri,  5 Dec 2014 13:58:01 +0800
From:	jun.zhang@...el.com
To:	mingo@...hat.com, peterz@...radead.org
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	zhang jun <jun.zhang@...el.com>,
	Chuansheng Liu <chuansheng.liu@...el.com>,
	Changcheng Liu <changcheng.liu@...el.com>,
	Hillf Danton <hillf.zj@...baba-inc.com>,
	Vincent Guittot <vincent.guittot@...aro.org>
Subject: [PATCH] sched/fair: fix find_idlest_cpu return -1

From: zhang jun <jun.zhang@...el.com>

find_idlest_cpu return -1 is not reasonable, set default value to this_cpu.

Signed-off-by: zhang jun <jun.zhang@...el.com>
Signed-off-by: Chuansheng Liu <chuansheng.liu@...el.com>
Signed-off-by: Changcheng Liu <changcheng.liu@...el.com>
Cc: Hillf Danton <hillf.zj@...baba-inc.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: <stable@...r.kernel.org> # 3.14.25
---
 kernel/sched/fair.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 9b4c4f3..9d18887 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -4151,7 +4151,7 @@ static int
 find_idlest_cpu(struct sched_group *group, struct task_struct *p, int this_cpu)
 {
 	unsigned long load, min_load = ULONG_MAX;
-	int idlest = -1;
+	int idlest = this_cpu;
 	int i;
 
 	/* Traverse only the allowed CPUs */
@@ -4284,7 +4284,7 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f
 		}
 
 		new_cpu = find_idlest_cpu(group, p, cpu);
-		if (new_cpu == -1 || new_cpu == cpu) {
+		if (new_cpu == cpu) {
 			/* Now try balancing at a lower domain level of cpu */
 			sd = sd->child;
 			continue;
-- 
1.7.9.5

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