linux-kernel - RE: [PATCH] f2fs: add unlikely() macro for compiler more aggressively

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Message-id: <000401cef25e$16f97d60$44ec7820$@samsung.com>
Date:	Fri, 06 Dec 2013 16:34:07 +0800
From:	Chao Yu <chao2.yu@...sung.com>
To:	'Jaegeuk Kim' <jaegeuk.kim@...sung.com>
Cc:	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-f2fs-devel@...ts.sourceforge.net
Subject: RE: [PATCH] f2fs: add unlikely() macro for compiler more aggressively

> -----Original Message-----
> From: Jaegeuk Kim [mailto:jaegeuk.kim@...sung.com]
> Sent: Friday, December 06, 2013 2:15 PM
> Cc: Jaegeuk Kim; linux-fsdevel@...r.kernel.org; linux-kernel@...r.kernel.org; linux-f2fs-devel@...ts.sourceforge.net; Chao Yu
> Subject: [PATCH] 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.

Looks nice to me!

> 
> Cc: Chao Yu <chao2.yu@...sung.com>
> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@...sung.com>

Reviewed-by: Chao Yu <chao2.yu@...sung.com>

> ---
>  fs/f2fs/checkpoint.c |  22 ++++++----
>  fs/f2fs/data.c       |  63 +++++++++++++--------------
>  fs/f2fs/dir.c        |  10 ++---
>  fs/f2fs/file.c       |  23 +++++-----
>  fs/f2fs/gc.c         |  19 ++++-----
>  fs/f2fs/inode.c      |  12 +++---
>  fs/f2fs/namei.c      |  24 ++++++-----
>  fs/f2fs/node.c       | 117 +++++++++++++++++++++++++++------------------------
>  fs/f2fs/recovery.c   |  10 ++---
>  fs/f2fs/segment.c    |  42 +++++++++---------
>  fs/f2fs/super.c      |  83 ++++++++++++++++++------------------
>  fs/f2fs/xattr.c      |  28 ++++++------
>  12 files changed, 234 insertions(+), 219 deletions(-)

[snip]

> @@ -808,11 +808,11 @@ retry:
>  		brelse(*raw_super_buf);
>  		f2fs_msg(sb, KERN_ERR, "Can't find a valid F2FS filesystem "
>  				"in %dth superblock", block + 1);
> -		if(block == 0) {
> +		if(unlikely(block != 0)) {

Original code has style problem:
Space is required before the open parenthesis '('.
Thanks.


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