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

From: Arnd Bergmann
Date: Mon Sep 27 2021 - 06:24:17 EST

From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxxxx>
Link: https://lore.kernel.org/all/20210322132103.qiun2rjilnlgztxe@wittgenstein/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
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.