AcoSail/kernel_optimize_test
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Ext2: use unlikely to improve the efficiency of the kernel

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Because the function 'sb_getblk' seldomly fails to return
NULL value. It will be better to use unlikely to optimize it.

Signed-off-by: Wang shilong <wangsl-fnst@cn.fujitsu.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Wang Shilong 2013-01-12 01:34:50 -08:00 committed by Jan Kara
parent 61f43e6880
commit 2b0542a4a0
2 changed files with 2 additions and 2 deletions
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2
fs/ext2/super.c
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@ -1500,7 +1500,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
bh = sb_bread(sb, tmp_bh.b_blocknr);
else
bh = sb_getblk(sb, tmp_bh.b_blocknr);
if (!bh) {
if (unlikely(!bh)) {
err = -EIO;
goto out;
}

2
fs/ext2/xattr.c
View File

@ -662,7 +662,7 @@ ext2_xattr_set2(struct inode *inode, struct buffer_head *old_bh,
ea_idebug(inode, "creating block %d", block);
new_bh = sb_getblk(sb, block);
if (!new_bh) {
if (unlikely(!new_bh)) {
ext2_free_blocks(inode, block, 1);
mark_inode_dirty(inode);
error = -EIO;