linux-kernel - Re: [PATCH] fs/ext2: replace ternary operator with min

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Date:   Thu, 14 Jul 2022 12:04:54 +0200
From:   Jan Kara <jack@...e.cz>
To:     Jiangshan Yi <13667453960@....com>
Cc:     jack@...e.com, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jiangshan Yi <yijiangshan@...inos.cn>
Subject: Re: [PATCH] fs/ext2: replace ternary operator with min_t()

On Thu 14-07-22 14:33:18, Jiangshan Yi wrote:
> From: Jiangshan Yi <yijiangshan@...inos.cn>
> 
> Fix the following coccicheck warning:
> 
> fs/ext2/super.c:1494: WARNING opportunity for min().
> fs/ext2/super.c:1533: WARNING opportunity for min().
> 
> min_t() macro is defined in include/linux/minmax.h. It avoids
> multiple evaluations of the arguments when non-constant and performs
> strict type-checking.
> 
> Signed-off-by: Jiangshan Yi <yijiangshan@...inos.cn>

Yeah, looks like a good cleanup. Merged to my tree. Thanks!

								Honza

> ---
>  fs/ext2/super.c | 6 ++----
>  1 file changed, 2 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ext2/super.c b/fs/ext2/super.c
> index f6a19f6d9f6d..300f2f0cf566 100644
> --- a/fs/ext2/super.c
> +++ b/fs/ext2/super.c
> @@ -1490,8 +1490,7 @@ static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data,
>  		len = i_size-off;
>  	toread = len;
>  	while (toread > 0) {
> -		tocopy = sb->s_blocksize - offset < toread ?
> -				sb->s_blocksize - offset : toread;
> +		tocopy = min_t(size_t, sb->s_blocksize - offset, toread);
>  
>  		tmp_bh.b_state = 0;
>  		tmp_bh.b_size = sb->s_blocksize;
> @@ -1529,8 +1528,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
>  	struct buffer_head *bh;
>  
>  	while (towrite > 0) {
> -		tocopy = sb->s_blocksize - offset < towrite ?
> -				sb->s_blocksize - offset : towrite;
> +		tocopy = min_t(size_t, sb->s_blocksize - offset, towrite);
>  
>  		tmp_bh.b_state = 0;
>  		tmp_bh.b_size = sb->s_blocksize;
> -- 
> 2.25.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR