linux-kernel - [PATCH v2] sched: deadline: Cleanup goto label in pick_earliest_pushable_dl

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Message-ID: <20241206000009.1226085-1-jstultz@google.com>
Date: Thu,  5 Dec 2024 15:59:35 -0800
From: John Stultz <jstultz@...gle.com>
To: LKML <linux-kernel@...r.kernel.org>
Cc: John Stultz <jstultz@...gle.com>, Ingo Molnar <mingo@...hat.com>, 
	Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, 
	Vincent Guittot <vincent.guittot@...aro.org>, Dietmar Eggemann <dietmar.eggemann@....com>, 
	Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>, 
	Valentin Schneider <vschneid@...hat.com>, Wanpeng Li <wanpeng.li@...ux.intel.com>, 
	Christophe JAILLET <christophe.jaillet@...adoo.fr>, Todd Kjos <tkjos@...gle.com>, 
	kernel-team@...roid.com
Subject: [PATCH v2] sched: deadline: Cleanup goto label in pick_earliest_pushable_dl_task

Commit 8b5e770ed7c0 ("sched/deadline: Optimize pull_dl_task()")
added a goto label seems would be better written as a while
loop.

So replace the goto with a while loop, to make it easier to read.

Cc: Ingo Molnar <mingo@...hat.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Juri Lelli <juri.lelli@...hat.com>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Ben Segall <bsegall@...gle.com>
Cc: Mel Gorman <mgorman@...e.de>
Cc: Valentin Schneider <vschneid@...hat.com>
Cc: Wanpeng Li <wanpeng.li@...ux.intel.com>
Cc: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Todd Kjos <tkjos@...gle.com>
Cc: kernel-team@...roid.com
Reported-by: Todd Kjos <tkjos@...gle.com>
Signed-off-by: John Stultz <jstultz@...gle.com>
---
v2:
* Corrects my misreading of the code (as pointed out by Christophe
  JAILLET) as already having a while loop, and switches the if to
  a while.
---
 kernel/sched/deadline.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index d9d5a702f1a61..b2cc71984176a 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -2501,16 +2501,13 @@ static struct task_struct *pick_earliest_pushable_dl_task(struct rq *rq, int cpu
 		return NULL;
 
 	next_node = rb_first_cached(&rq->dl.pushable_dl_tasks_root);
-
-next_node:
-	if (next_node) {
+	while (next_node) {
 		p = __node_2_pdl(next_node);
 
 		if (task_is_pushable(rq, p, cpu))
 			return p;
 
 		next_node = rb_next(next_node);
-		goto next_node;
 	}
 
 	return NULL;
-- 
2.47.0.338.g60cca15819-goog