linux-ext4 - [PATCH] ext4: use kmem_cache_zalloc instead of kmem_cache

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Date:	Mon, 27 Aug 2012 12:40:16 +0800
From:	Wei Yongjun <weiyj.lk@...il.com>
To:	tytso@....edu, adilger.kernel@...ger.ca
Cc:	yongjun_wei@...ndmicro.com.cn, linux-ext4@...r.kernel.org
Subject: [PATCH] ext4: use kmem_cache_zalloc instead of kmem_cache_alloc/memset

From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Using kmem_cache_zalloc() instead of kmem_cache_alloc() and memset().

spatch with a semantic match is used to found this problem.
(http://coccinelle.lip6.fr/)

Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
---
 fs/ext4/mballoc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 8eae947..6bc21a2 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2195,12 +2195,11 @@ int ext4_mb_add_groupinfo(struct super_block *sb, ext4_group_t group,
 		sbi->s_group_info[group >> EXT4_DESC_PER_BLOCK_BITS(sb)];
 	i = group & (EXT4_DESC_PER_BLOCK(sb) - 1);
 
-	meta_group_info[i] = kmem_cache_alloc(cachep, GFP_KERNEL);
+	meta_group_info[i] = kmem_cache_zalloc(cachep, GFP_KERNEL);
 	if (meta_group_info[i] == NULL) {
 		ext4_msg(sb, KERN_ERR, "can't allocate buddy mem");
 		goto exit_group_info;
 	}
-	memset(meta_group_info[i], 0, kmem_cache_size(cachep));
 	set_bit(EXT4_GROUP_INFO_NEED_INIT_BIT,
 		&(meta_group_info[i]->bb_state));
 

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