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| author | Wang Shilong <wangsl-fnst@cn.fujitsu.com> | 2013-01-12 16:28:47 -0500 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2013-01-12 16:28:47 -0500 |
| commit | aebf02430d25b6bd2b8542126fdcdb90e75a24b8 (patch) | |
| tree | 7f884e64b000d9bed3a59dd557b3075a2da4405d /fs/ext4/inode.c | |
| parent | 860d21e2c585f7ee8a4ecc06f474fdc33c9474f4 (diff) | |
| download | kernel_goldelico_gta04-aebf02430d25b6bd2b8542126fdcdb90e75a24b8.zip kernel_goldelico_gta04-aebf02430d25b6bd2b8542126fdcdb90e75a24b8.tar.gz kernel_goldelico_gta04-aebf02430d25b6bd2b8542126fdcdb90e75a24b8.tar.bz2 | |
ext4: use unlikely to improve the efficiency of the kernel
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: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/inode.c')
| -rw-r--r-- | fs/ext4/inode.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 9ccc140..93a7e84 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -713,7 +713,7 @@ struct buffer_head *ext4_getblk(handle_t *handle, struct inode *inode, return NULL; bh = sb_getblk(inode->i_sb, map.m_pblk); - if (!bh) { + if (unlikely(!bh)) { *errp = -ENOMEM; return NULL; } @@ -3660,7 +3660,7 @@ static int __ext4_get_inode_loc(struct inode *inode, iloc->offset = (inode_offset % inodes_per_block) * EXT4_INODE_SIZE(sb); bh = sb_getblk(sb, block); - if (!bh) + if (unlikely(!bh)) return -ENOMEM; if (!buffer_uptodate(bh)) { lock_buffer(bh); @@ -3693,7 +3693,7 @@ static int __ext4_get_inode_loc(struct inode *inode, /* Is the inode bitmap in cache? */ bitmap_bh = sb_getblk(sb, ext4_inode_bitmap(sb, gdp)); - if (!bitmap_bh) + if (unlikely(!bitmap_bh)) goto make_io; /* |