linux-kernel - [PATCH] sched/fair: add !se->on_rq check before dequeue entity

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Message-Id: <1582183784-13502-1-git-send-email-qiwuchen55@gmail.com>
Date:   Thu, 20 Feb 2020 15:29:44 +0800
From:   qiwuchen55@...il.com
To:     mingo@...hat.com, 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, chenqiwu <chenqiwu@...omi.com>
Subject: [PATCH] sched/fair: add !se->on_rq check before dequeue entity

From: chenqiwu <chenqiwu@...omi.com>

We igonre checking for !se->on_rq condition before dequeue one
entity from cfs rq. It must be required in case the entity has
been dequeued.

Signed-off-by: chenqiwu <chenqiwu@...omi.com>
---
 kernel/sched/fair.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 3c8a379..945dcaf 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -5341,6 +5341,8 @@ static void dequeue_task_fair(struct rq *rq, struct task_struct *p, int flags)
 	bool was_sched_idle = sched_idle_rq(rq);
 
 	for_each_sched_entity(se) {
+		if (!se->on_rq)
+			break;
 		cfs_rq = cfs_rq_of(se);
 		dequeue_entity(cfs_rq, se, flags);
 
-- 
1.9.1