linux-kernel - [tip:sched/core] sched/deadline: Remove a redundant condition from task_woken

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Message-ID: <tip-3fe33bcdd358dd8c641cf4d92c9d2d9972ca94dd@git.kernel.org>
Date:	Mon, 3 Aug 2015 10:05:59 -0700
From:	tip-bot for Xunlei Pang <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	rostedt@...dmis.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, mingo@...nel.org,
	juri.lelli@...il.com, pang.xunlei@...aro.org, peterz@...radead.org,
	efault@....de, hpa@...or.com, torvalds@...ux-foundation.org
Subject: [tip:sched/core] sched/deadline:
  Remove a redundant condition from task_woken_dl()

Commit-ID:  3fe33bcdd358dd8c641cf4d92c9d2d9972ca94dd
Gitweb:     http://git.kernel.org/tip/3fe33bcdd358dd8c641cf4d92c9d2d9972ca94dd
Author:     Xunlei Pang <pang.xunlei@...aro.org>
AuthorDate: Sat, 4 Jul 2015 15:39:23 +0800
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Mon, 3 Aug 2015 12:21:20 +0200

sched/deadline: Remove a redundant condition from task_woken_dl()

'p' has been already queued at this point, so "!task_running(rq, p)"
and "p->nr_cpus_allowed > 1" imply that "has_pushable_dl_tasks(rq)"
is true, so it can be removed.

Signed-off-by: Xunlei Pang <pang.xunlei@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Steven Rostedt <rostedt@...dmis.org>
Cc: Juri Lelli <juri.lelli@...il.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/1435995563-3723-2-git-send-email-xlpang@126.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/deadline.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index 0a17af35..20772ee 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -1657,7 +1657,6 @@ static void task_woken_dl(struct rq *rq, struct task_struct *p)
 {
 	if (!task_running(rq, p) &&
 	    !test_tsk_need_resched(rq->curr) &&
-	    has_pushable_dl_tasks(rq) &&
 	    p->nr_cpus_allowed > 1 &&
 	    dl_task(rq->curr) &&
 	    (rq->curr->nr_cpus_allowed < 2 ||
--
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