linux-kernel - Re: [PATCH] hfs/hfsplus: use WARN

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Date:   Tue, 23 Mar 2021 10:01:02 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     linux-fsdevel@...r.kernel.org, Arnd Bergmann <arnd@...db.de>,
        Jens Axboe <axboe@...nel.dk>,
        James Morris <jamorris@...ux.microsoft.com>,
        Damien Le Moal <damien.lemoal@....com>,
        Chaitanya Kulkarni <chaitanya.kulkarni@....com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hfs/hfsplus: use WARN_ON for sanity check

On Mon, Mar 22, 2021 at 11:32:40PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> gcc warns about a couple of instances in which a sanity check
> exists but the author wasn't sure how to react to it failing,
> which makes it look like a possible bug:
> 
> fs/hfsplus/inode.c: In function 'hfsplus_cat_read_inode':
> fs/hfsplus/inode.c:503:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   503 |                         /* panic? */;
>       |                                     ^
> fs/hfsplus/inode.c:524:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   524 |                         /* panic? */;
>       |                                     ^
> fs/hfsplus/inode.c: In function 'hfsplus_cat_write_inode':
> fs/hfsplus/inode.c:582:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   582 |                         /* panic? */;
>       |                                     ^
> fs/hfsplus/inode.c:608:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   608 |                         /* panic? */;
>       |                                     ^
> fs/hfs/inode.c: In function 'hfs_write_inode':
> fs/hfs/inode.c:464:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   464 |                         /* panic? */;
>       |                                     ^
> fs/hfs/inode.c:485:37: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   485 |                         /* panic? */;
>       |                                     ^
> 
> panic() is probably not the correct choice here, but a WARN_ON
> seems appropriate and avoids the compile-time warning.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Thanks!
Reviewed-by: Christian Brauner <christian.brauner@...ntu.com>