linux-kernel - [PATCH v2 3/3] sched/cpudeadline: Cleanup of duplicate memory initialization

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Message-Id: <1449117901-9561-3-git-send-email-xlpang@redhat.com>
Date:	Thu,  3 Dec 2015 12:45:01 +0800
From:	Xunlei Pang <xlpang@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Xunlei Pang <xlpang@...hat.com>
Subject: [PATCH v2 3/3] sched/cpudeadline: Cleanup of duplicate memory initialization

There is already a memset clear operation for '*cp', so we can use
alloc_cpumask_var() with __GFP_ZERO instead of zalloc_cpumask_var()
to avoid duplicate clear for systems without CONFIG_CPUMASK_OFFSTACK
set.

Also omit "cp->size = 0;".

Signed-off-by: Xunlei Pang <xlpang@...hat.com>
---
 kernel/sched/cpudeadline.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index 5a75b08..ca780ec 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -211,7 +211,6 @@ int cpudl_init(struct cpudl *cp)
 
 	memset(cp, 0, sizeof(*cp));
 	raw_spin_lock_init(&cp->lock);
-	cp->size = 0;
 
 	cp->elements = kcalloc(nr_cpu_ids,
 			       sizeof(struct cpudl_item),
@@ -219,7 +218,7 @@ int cpudl_init(struct cpudl *cp)
 	if (!cp->elements)
 		return -ENOMEM;
 
-	if (!zalloc_cpumask_var(&cp->free_cpus, GFP_KERNEL)) {
+	if (!alloc_cpumask_var(&cp->free_cpus, GFP_KERNEL | __GFP_ZERO)) {
 		kfree(cp->elements);
 		return -ENOMEM;
 	}
-- 
2.5.0

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