linux-kernel - [PATCH v2] sched: rt: Simplify pick_next_rt

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Message-Id: <20230407180952.2757-1-zeming@nfschina.com>
Date:   Sat,  8 Apr 2023 02:09:52 +0800
From:   Li zeming <zeming@...china.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,
        bristot@...hat.com, vschneid@...hat.com
Cc:     linux-kernel@...r.kernel.org, Li zeming <zeming@...china.com>
Subject: [PATCH v2] sched: rt: Simplify pick_next_rt_entity()

Remove useless intermediate variable "next" and its initialization. 
Directly return the next RT scheduling entity obtained from
list_entry().

Signed-off-by: Li zeming <zeming@...china.com>
Reviewed-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
 v2: Simplify title and descriptive information.
 
 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