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>
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 @@
return NULL;
bh = sb_getblk(inode->i_sb, map.m_pblk);
- if (!bh) {
+ if (unlikely(!bh)) {
*errp = -ENOMEM;
return NULL;
}
@@ -3660,7 +3660,7 @@
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 @@
/* 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;
/*