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Date: Sat, 12 Jan 2013 01:34:50 -0800 From: shilong wang <wangshilong1991@...il.com> To: Jan Kara <jack@...e.cz> Cc: linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org Subject: [PATCH 1/2] Ext2: use unlikely to improve the efficiency of the kernel From: Wang Shilong <wangsl-fnst@...fujitsu.com> 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@...fujitsu.com> --- fs/ext2/super.c | 2 +- fs/ext2/xattr.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext2/super.c b/fs/ext2/super.c index af74d9e..c0f4fc6 100644 --- a/fs/ext2/super.c +++ b/fs/ext2/super.c @@ -1495,7 +1495,7 @@ 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; } diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c index b6754db..06209ec 100644 --- a/fs/ext2/xattr.c +++ b/fs/ext2/xattr.c @@ -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; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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