linux-kernel - [tip:sched/core] sched/deadline: Remove superfluous call to switched_to

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Message-ID: <tip-801ccdbf018ca5dbd478756ece55cd6c7726ed5b@git.kernel.org>
Date:	Mon, 29 Feb 2016 03:19:42 -0800
From:	tip-bot for Peter Zijlstra <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	luca.abeni@...tn.it, torvalds@...ux-foundation.org,
	tglx@...utronix.de, hpa@...or.com, efault@....de,
	linux-kernel@...r.kernel.org, juri.lelli@....com, mingo@...nel.org,
	peterz@...radead.org
Subject: [tip:sched/core] sched/deadline: Remove superfluous call to
 switched_to_dl()

Commit-ID:  801ccdbf018ca5dbd478756ece55cd6c7726ed5b
Gitweb:     http://git.kernel.org/tip/801ccdbf018ca5dbd478756ece55cd6c7726ed5b
Author:     Peter Zijlstra <peterz@...radead.org>
AuthorDate: Thu, 25 Feb 2016 15:01:49 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 29 Feb 2016 09:53:11 +0100

sched/deadline: Remove superfluous call to switched_to_dl()

	if (A || B) {

	} else if (A && !B) {

	}

If A we'll take the first branch, if !A we will not satisfy the second.
Therefore the second branch will never be taken.

Reported-by: luca abeni <luca.abeni@...tn.it>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Juri Lelli <juri.lelli@....com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Mike Galbraith <efault@....de>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20160225140149.GK6357@twins.programming.kicks-ass.net
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/deadline.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 04a569c..15abf04 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1772,8 +1772,7 @@ static void prio_changed_dl(struct rq *rq, struct task_struct *p,
 		 */
 		resched_curr(rq);
 #endif /* CONFIG_SMP */
-	} else
-		switched_to_dl(rq, p);
+	}
 }
 
 const struct sched_class dl_sched_class = {