linux-kernel - Re: [PATCH linux-next] fs/ext4: use BUG_ON instead of if condition followed by BUG

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Date:   Mon, 20 Dec 2021 11:24:21 +0100
From:   Lukas Czerner <lczerner@...hat.com>
To:     cgel.zte@...il.com
Cc:     tytso@....edu, linux-ext4@...r.kernel.org,
        adilger.kernel@...ger.ca, linux-kernel@...r.kernel.org,
        xu xin <xu.xin16@....com.cn>, Zeal robot <zealci@....com.cn>
Subject: Re: [PATCH linux-next] fs/ext4: use BUG_ON instead of if condition
 followed by BUG

On Sun, Dec 19, 2021 at 01:06:43PM +0000, cgel.zte@...il.com wrote:
> From: xu xin <xu.xin16@....com.cn>
> 
> BUG_ON would be better.

Indeed. Thanks for the patch.

Reviewed-by: Lukas Czerner <lczerner@...hat.com>


> 
> This issue was detected with the help of Coccinelle.
> 
> Reported-by: Zeal robot <zealci@....com.cn>
> Signed-off-by: xu xin <xu.xin16@....com.cn>
> ---
>  fs/ext4/ext4.h | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
> index 9cc55bcda6ba..00bc3f67d37f 100644
> --- a/fs/ext4/ext4.h
> +++ b/fs/ext4/ext4.h
> @@ -2400,8 +2400,7 @@ ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
>  
>  static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
>  {
> -	if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
> -		BUG();
> +	BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
>  #if (PAGE_SIZE >= 65536)
>  	if (len < 65536)
>  		return cpu_to_le16(len);
> -- 
> 2.25.1
>