linux-kernel - [PATCH] [RESEND] [v2] posix-acl: avoid -Wempty-body warning

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Message-Id: <20210927102410.1863853-1-arnd@kernel.org>
Date:   Mon, 27 Sep 2021 12:23:56 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Christian Brauner <christian.brauner@...ntu.com>,
        James Morris <jamorris@...ux.microsoft.com>,
        Serge Hallyn <serge@...lyn.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [RESEND] [v2] posix-acl: avoid -Wempty-body warning

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 */ ;
      |                                    ^

Simplify it as a step towards a clean W=1 build.  As all architectures
define cmpxchg() as a statement expression these days, it is no longer
necessary to evaluate its return code, and the if() can just be droped.

Reviewed-by: Christian Brauner <christian.brauner@...ntu.com>
Link: https://lore.kernel.org/all/20210322132103.qiun2rjilnlgztxe@wittgenstein/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/posix_acl.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/fs/posix_acl.c b/fs/posix_acl.c
index f5c25f580dd9..9323a854a60a 100644
--- a/fs/posix_acl.c
+++ b/fs/posix_acl.c
@@ -134,8 +134,7 @@ struct posix_acl *get_acl(struct inode *inode, int type)
 	 * to just call ->get_acl to fetch the ACL ourself.  (This is going to
 	 * be an unlikely race.)
 	 */
-	if (cmpxchg(p, ACL_NOT_CACHED, sentinel) != ACL_NOT_CACHED)
-		/* fall through */ ;
+	cmpxchg(p, ACL_NOT_CACHED, sentinel);
 
 	/*
 	 * Normally, the ACL returned by ->get_acl will be cached.
-- 
2.29.2