linux-kernel - [tip:sched/core] sched: Adjust sched_reset_on

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Message-ID: <tip-a296858625f810c28ceb360d448d4db5758ca48a@git.kernel.org>
Date:	Fri, 21 Feb 2014 13:32:01 -0800
From:	tip-bot for Thomas Gleixner <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	mingo@...nel.org, peterz@...radead.org, bigeasy@...utronix.de,
	tglx@...utronix.de
Subject: [tip:sched/core] sched:
  Adjust sched_reset_on_fork when nothing else changes

Commit-ID:  a296858625f810c28ceb360d448d4db5758ca48a
Gitweb:     http://git.kernel.org/tip/a296858625f810c28ceb360d448d4db5758ca48a
Author:     Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 7 Feb 2014 20:58:40 +0100
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Fri, 21 Feb 2014 21:43:19 +0100

sched: Adjust sched_reset_on_fork when nothing else changes

If the policy and priority remain unchanged a possible modification of
sched_reset_on_fork gets lost in the early exit path.

[bigeasy: rebase ontop of v3.14-rc1]
Cc: Ingo Molnar <mingo@...hat.com>
Cc: stable@...r.kernel.org
Cc: stable@...r.kernel.org
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1391803122-4425-5-git-send-email-bigeasy@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 kernel/sched/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 241f7465..7527e68 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3370,7 +3370,8 @@ recheck:
 	}
 
 	/*
-	 * If not changing anything there's no need to proceed further:
+	 * If not changing anything there's no need to proceed further,
+	 * but store a possible modification of reset_on_fork.
 	 */
 	if (unlikely(policy == p->policy)) {
 		if (fair_policy(policy) && attr->sched_nice != task_nice(p))
@@ -3380,6 +3381,7 @@ recheck:
 		if (dl_policy(policy))
 			goto change;
 
+		p->sched_reset_on_fork = reset_on_fork;
 		task_rq_unlock(rq, p, &flags);
 		return 0;
 	}
--
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