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>

1 files changed, 3 insertions, 3 deletions

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d42a8c49ad69..391e53a52e58 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -956,7 +956,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
                 goto cleanup;
         }
         bh = sb_getblk(inode->i_sb, newblock);
-        if (!bh) {
+        if (unlikely(!bh)) {
                 err = -ENOMEM;
                 goto cleanup;
         }
@@ -1029,7 +1029,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
                 oldblock = newblock;
                 newblock = ablocks[--a];
                 bh = sb_getblk(inode->i_sb, newblock);
-                if (!bh) {
+                if (unlikely(!bh)) {
                         err = -ENOMEM;
                         goto cleanup;
                 }
@@ -1142,7 +1142,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
                 return err;
 
         bh = sb_getblk(inode->i_sb, newblock);
-        if (!bh)
+        if (unlikely(!bh))
                 return -ENOMEM;
         lock_buffer(bh);