linux-kernel - [tip:sched/core] sched: Don't set sd-> child to NULL when it is already NULL

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Date:	Wed, 19 Jun 2013 11:40:36 -0700
From:	tip-bot for Viresh Kumar <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, viresh.kumar@...aro.org, tglx@...utronix.de
Subject: [tip:sched/core] sched: Don't set sd->
 child to NULL when it is already NULL

Commit-ID:  c75e01288ce9c9a6b7beb6b23c07d2e4d1db8c84
Gitweb:     http://git.kernel.org/tip/c75e01288ce9c9a6b7beb6b23c07d2e4d1db8c84
Author:     Viresh Kumar <viresh.kumar@...aro.org>
AuthorDate: Mon, 10 Jun 2013 16:27:19 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Wed, 19 Jun 2013 12:58:45 +0200

sched: Don't set sd->child to NULL when it is already NULL

Memory for sd is allocated with kzalloc_node() which will initialize its fields
with zero. In build_sched_domain() we are setting sd->child to child even if
child is NULL, which isn't required.

Lets do it only if child isn't NULL.

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/f4753a1730051341003ad2ad29a3229c7356678e.1370861520.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3de6264..88c2c0e 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5955,8 +5955,8 @@ struct sched_domain *build_sched_domain(struct sched_domain_topology_level *tl,
 		sd->level = child->level + 1;
 		sched_domain_level_max = max(sched_domain_level_max, sd->level);
 		child->parent = sd;
+		sd->child = child;
 	}
-	sd->child = child;
 	set_domain_attribute(sd, attr);
 
 	return sd;
--
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