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From:   Vincent Guittot <vincent.guittot@linaro.org>
To:     mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
        dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com,
        mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com,
        linux-kernel@vger.kernel.org
Cc:     zhangqiao22@huawei.com,
        Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH 3/4] sched/fair: move call to list_last_entry() in detach_tasks
Date:   Thu, 25 Aug 2022 14:27:25 +0200
Message-Id: <20220825122726.20819-4-vincent.guittot@linaro.org>
In-Reply-To: <20220825122726.20819-1-vincent.guittot@linaro.org>
References: <20220825122726.20819-1-vincent.guittot@linaro.org>
Precedence: bulk

Move the call to list_last_entry() in detach_tasks() after testing
loop_max and loop_break.

Signed-off-by: Vincent Guittot <vincent.guittot@linaro.org>
---
 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 6972a1a29a48..260a55ac462f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -8047,8 +8047,6 @@ static int detach_tasks(struct lb_env *env)
 		if (env->idle != CPU_NOT_IDLE && env->src_rq->nr_running <= 1)
 			break;
 
-		p = list_last_entry(tasks, struct task_struct, se.group_node);
-
 		env->loop++;
 		/*
 		 * We've more or less seen every task there is, call it quits
@@ -8065,6 +8063,8 @@ static int detach_tasks(struct lb_env *env)
 			break;
 		}
 
+		p = list_last_entry(tasks, struct task_struct, se.group_node);
+
 		if (!can_migrate_task(p, env))
 			goto next;
 
-- 
2.17.1