linux-kernel - [tip:sched/core] sched/topology: Drop memset() from init

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Message-ID: <tip-4d13a06d54c415238325b0fe2c14f1052da4512f@git.kernel.org>
Date:   Thu, 10 Aug 2017 05:05:38 -0700
From:   tip-bot for Viresh Kumar <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     viresh.kumar@...aro.org, peterz@...radead.org,
        vincent.guittot@...aro.org, mingo@...nel.org, tglx@...utronix.de,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        hpa@...or.com
Subject: [tip:sched/core] sched/topology: Drop memset() from
 init_rootdomain()

Commit-ID:  4d13a06d54c415238325b0fe2c14f1052da4512f
Gitweb:     http://git.kernel.org/tip/4d13a06d54c415238325b0fe2c14f1052da4512f
Author:     Viresh Kumar <viresh.kumar@...aro.org>
AuthorDate: Thu, 13 Apr 2017 14:45:48 +0530
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Thu, 10 Aug 2017 12:18:13 +0200

sched/topology: Drop memset() from init_rootdomain()

There are only two callers of init_rootdomain(). One of them passes a
global to it and another one sends dynamically allocated root-domain.

There is no need to memset the root-domain in the first case as the
structure is already reset.

Update alloc_rootdomain() to allocate the memory with kzalloc() and
remove the memset() call from init_rootdomain().

Signed-off-by: Viresh Kumar <viresh.kumar@...aro.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Vincent Guittot <vincent.guittot@...aro.org>
Cc: linaro-kernel@...ts.linaro.org
Link: http://lkml.kernel.org/r/fc2f6cc90b098040970c85a97046512572d765bc.1492065513.git.viresh.kumar@linaro.org
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/sched/topology.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index 79895ae..216fee0 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -261,8 +261,6 @@ void rq_attach_root(struct rq *rq, struct root_domain *rd)
 
 static int init_rootdomain(struct root_domain *rd)
 {
-	memset(rd, 0, sizeof(*rd));
-
 	if (!zalloc_cpumask_var(&rd->span, GFP_KERNEL))
 		goto out;
 	if (!zalloc_cpumask_var(&rd->online, GFP_KERNEL))
@@ -311,7 +309,7 @@ static struct root_domain *alloc_rootdomain(void)
 {
 	struct root_domain *rd;
 
-	rd = kmalloc(sizeof(*rd), GFP_KERNEL);
+	rd = kzalloc(sizeof(*rd), GFP_KERNEL);
 	if (!rd)
 		return NULL;