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

From: Arnd Bergmann
Date: Mon Sep 27 2021 - 06:09:25 EST

From: Arnd Bergmann <arnd@xxxxxxxx>

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@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/all/4e3e409e-c72e-edd5-379a-60883f166405@xxxxxxxxxxxxx/
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
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)
-#define AA_BUG_FMT(X, fmt, args...)
+#define AA_BUG_FMT(X, fmt, args...) no_printk("Apparmor WARN" fmt, ##args)

#define AA_ERROR(fmt, args...) \