linux-kernel - [tip:sched/core] sched: Do not zero sg->cpumask and sg->sgp-> power in build_sched

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Date:	Thu, 22 May 2014 05:27:36 -0700
From:	tip-bot for Dietmar Eggemann <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, dietmar.eggemann@....com,
	Dietmar.Eggemann@....com, tglx@...utronix.de
Subject: [tip:sched/core] sched: Do not zero sg->cpumask and sg->sgp->
 power in build_sched_groups()

Commit-ID:  caffcdd8d27ba78730d5540396ce72ad022aff2c
Gitweb:     http://git.kernel.org/tip/caffcdd8d27ba78730d5540396ce72ad022aff2c
Author:     Dietmar Eggemann <Dietmar.Eggemann@....com>
AuthorDate: Wed, 30 Apr 2014 14:39:38 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 22 May 2014 11:16:30 +0200

sched: Do not zero sg->cpumask and sg->sgp->power in build_sched_groups()

There is no need to zero struct sched_group member cpumask and struct
sched_group_power member power since both structures are already allocated
as zeroed memory in __sdt_alloc().

This patch has been tested with
BUG_ON(!cpumask_empty(sched_group_cpus(sg))); and BUG_ON(sg->sgp->power);
in build_sched_groups() on ARM TC2 and INTEL i5 M520 platform including
CPU hotplug scenarios.

Signed-off-by: Dietmar Eggemann <dietmar.eggemann@....com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1398865178-12577-1-git-send-email-dietmar.eggemann@arm.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 45d077e..6340c60 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5794,8 +5794,6 @@ build_sched_groups(struct sched_domain *sd, int cpu)
 			continue;
 
 		group = get_group(i, sdd, &sg);
-		cpumask_clear(sched_group_cpus(sg));
-		sg->sgp->power = 0;
 		cpumask_setall(sched_group_mask(sg));
 
 		for_each_cpu(j, span) {
--
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