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From:   Li zeming <zeming@nfschina.com>
To:     mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com,
        vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
        rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
        bristot@redhat.com, vschneid@redhat.com
Cc:     linux-kernel@vger.kernel.org, Li zeming <zeming@nfschina.com>
Subject: [PATCH] sched: rt: Optimization function 'pick_next_rt_entity'
Date:   Thu,  6 Apr 2023 07:29:00 +0800
Message-Id: <20230405232900.4019-1-zeming@nfschina.com>
Precedence: bulk

The moral of this function is to obtain the next RT scheduling entity
object,while 'list_entry' Implementation function of  'container_of'
returns the next RT scheduling entity object (no new code should be
added afterwards), directly returning 'list_entry' The execution result
is sufficient.

Signed-off-by: Li zeming <zeming@nfschina.com>
---
 kernel/sched/rt.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 0a11f44adee5..e9b1c08c20a7 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1769,7 +1769,6 @@ static inline void set_next_task_rt(struct rq *rq, struct task_struct *p, bool f
 static struct sched_rt_entity *pick_next_rt_entity(struct rt_rq *rt_rq)
 {
 	struct rt_prio_array *array = &rt_rq->active;
-	struct sched_rt_entity *next = NULL;
 	struct list_head *queue;
 	int idx;
 
@@ -1779,9 +1778,8 @@ static struct sched_rt_entity *pick_next_rt_entity(struct rt_rq *rt_rq)
 	queue = array->queue + idx;
 	if (SCHED_WARN_ON(list_empty(queue)))
 		return NULL;
-	next = list_entry(queue->next, struct sched_rt_entity, run_list);
 
-	return next;
+	return list_entry(queue->next, struct sched_rt_entity, run_list);
 }
 
 static struct task_struct *_pick_next_task_rt(struct rq *rq)
-- 
2.18.2