linux-kernel - [PATCH] [RESEND] apparmor: avoid -Wempty-body warning

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Message-Id: <20210927100919.1500526-1-arnd@kernel.org>
Date:   Mon, 27 Sep 2021 12:09:12 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     John Johansen <john.johansen@...onical.com>,
        James Morris <jmorris@...ei.org>,
        "Serge E. Hallyn" <serge@...lyn.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        linux-security-module@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] [RESEND] apparmor: avoid -Wempty-body warning

From: Arnd Bergmann <arnd@...db.de>

Building with 'make W=1' shows a warning for an empty macro:

security/apparmor/label.c: In function '__label_update':
security/apparmor/label.c:2096:59: error: suggest braces around empty body in an 'else' statement [-Werror=empty-body]
 2096 |                 AA_BUG(labels_ns(label) != labels_ns(new));

Change the macro defintion to use no_printk(), which improves
format string checking and avoids the warning.

Acked-by: John Johansen <john.johansen@...onical.com>
Link: https://lore.kernel.org/all/4e3e409e-c72e-edd5-379a-60883f166405@canonical.com/
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
I sentn this back in April, and John replied that it's in the apparmor
tree, but the fix is still missing as of v5.15-rc2.

Please double-check and re-apply if necessary.
---
 security/apparmor/include/lib.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/security/apparmor/include/lib.h b/security/apparmor/include/lib.h
index 7d27db740bc2..394130a0f3a4 100644
--- a/security/apparmor/include/lib.h
+++ b/security/apparmor/include/lib.h
@@ -36,7 +36,7 @@
 #define AA_BUG_FMT(X, fmt, args...)					\
 	WARN((X), "AppArmor WARN %s: (" #X "): " fmt, __func__, ##args)
 #else
-#define AA_BUG_FMT(X, fmt, args...)
+#define AA_BUG_FMT(X, fmt, args...) no_printk("Apparmor WARN" fmt, ##args)
 #endif
 
 #define AA_ERROR(fmt, args...)						\
-- 
2.29.2