linux-kernel - Re: [PATCH] posix-acl: avoid -Wempty-body warning

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Date:   Mon, 22 Mar 2021 13:15:06 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Alexander Viro <viro@...iv.linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        James Morris <jamorris@...ux.microsoft.com>,
        Serge Hallyn <serge@...lyn.com>, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] posix-acl: avoid -Wempty-body warning

On Mon, Mar 22, 2021 at 12:38:24PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> The fallthrough comment for an ignored cmpxchg() return value
> produces a harmless warning with 'make W=1':
> 
> fs/posix_acl.c: In function 'get_acl':
> fs/posix_acl.c:127:36: error: suggest braces around empty body in an 'if' statement [-Werror=empty-body]
>   127 |                 /* fall through */ ;
>       |                                    ^
> 
> Rewrite it as gcc suggests as a step towards a clean W=1 build.
> On most architectures, we could just drop the if() entirely, but
> in some cases this causes a different warning.

And you don't see the warning for the second unconditional
cmpxchg(p, sentinel, ACL_NOT_CACHED);
below?

> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

In any case that should be fine,
Reviewed-by: Christian Brauner <christian.brauner@...ntu.com>