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| author | Jaegeuk Kim | 2013-12-06 07:00:58 +0100 |
|---|---|---|
| committer | Jaegeuk Kim | 2013-12-23 02:18:06 +0100 |
| commit | 6bacf52fb58aeb3e89d9a62970b85a5570aa8ace (patch) | |
| tree | 422eb46c144b7ffbae193570a001de2eed490e09 /fs/f2fs/file.c | |
| parent | f2fs: add unlikely() macro for compiler optimization (diff) | |
| download | kernel-qcow2-linux-6bacf52fb58aeb3e89d9a62970b85a5570aa8ace.tar.gz kernel-qcow2-linux-6bacf52fb58aeb3e89d9a62970b85a5570aa8ace.tar.xz kernel-qcow2-linux-6bacf52fb58aeb3e89d9a62970b85a5570aa8ace.zip | |
f2fs: add unlikely() macro for compiler more aggressively
This patch adds unlikely() macro into the most of codes.
The basic rule is to add that when:
- checking unusual errors,
- checking page mappings,
- and the other unlikely conditions.
Change log from v1:
- Don't add unlikely for the NULL test and error test: advised by Andi Kleen.
Cc: Chao Yu <chao2.yu@samsung.com>
Cc: Andi Kleen <andi@firstfloor.org>
Reviewed-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/file.c')
| -rw-r--r-- | fs/f2fs/file.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c index 2b47adcd852a..5accc964368d 100644 --- a/fs/f2fs/file.c +++ b/fs/f2fs/file.c @@ -50,9 +50,9 @@ static int f2fs_vm_page_mkwrite(struct vm_area_struct *vma, file_update_time(vma->vm_file); lock_page(page); - if (page->mapping != inode->i_mapping || + if (unlikely(page->mapping != inode->i_mapping || page_offset(page) > i_size_read(inode) || - !PageUptodate(page)) { + !PageUptodate(page))) { unlock_page(page); err = -EFAULT; goto out; @@ -120,7 +120,7 @@ int f2fs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) .for_reclaim = 0, }; - if (f2fs_readonly(inode->i_sb)) + if (unlikely(f2fs_readonly(inode->i_sb))) return 0; trace_f2fs_sync_file_enter(inode); @@ -241,7 +241,7 @@ static void truncate_partial_data_page(struct inode *inode, u64 from) return; lock_page(page); - if (page->mapping != inode->i_mapping) { + if (unlikely(page->mapping != inode->i_mapping)) { f2fs_put_page(page, 1); return; } @@ -516,7 +516,6 @@ static int expand_inode_data(struct inode *inode, loff_t offset, if (ret) break; - if (pg_start == pg_end) new_size = offset + len; else if (index == pg_start && off_start) |