linux-kernel - [PATCH v2 2/3] sched/cpupri: Cleanup of duplicate memory initialization

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Date:	Thu,  3 Dec 2015 12:45:00 +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 2/3] sched/cpupri: 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 "atomic_set(&vec->count, 0);".

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

diff --git a/kernel/sched/cpupri.c b/kernel/sched/cpupri.c
index 981fcd7..b8f73a7 100644
--- a/kernel/sched/cpupri.c
+++ b/kernel/sched/cpupri.c
@@ -214,8 +214,7 @@ int cpupri_init(struct cpupri *cp)
 	for (i = 0; i < CPUPRI_NR_PRIORITIES; i++) {
 		struct cpupri_vec *vec = &cp->pri_to_cpu[i];
 
-		atomic_set(&vec->count, 0);
-		if (!zalloc_cpumask_var(&vec->mask, GFP_KERNEL))
+		if (!alloc_cpumask_var(&vec->mask, GFP_KERNEL | __GFP_ZERO))
 			goto cleanup;
 	}
 
-- 
2.5.0

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