kbuild: enforce -Werror=return-type

commit 172aad81a882443eefe1bd860c4eddc81b14dd5b upstream.

Catch errors which at least gcc tolerates by default:
 warning: 'return' with no value, in function returning non-void [-Wreturn-type]

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/Makefile b/Makefile
index 3e44a81..17ee114 100644 (file)
--- a/Makefile
+++ b/Makefile
@@ -438,7 +438,7 @@ KBUILD_AFLAGS   := -D__ASSEMBLY__
 KBUILD_CFLAGS   := -Wall -Wundef -Wstrict-prototypes -Wno-trigraphs \
                   -fno-strict-aliasing -fno-common -fshort-wchar \
                   -Werror-implicit-function-declaration \
-                  -Wno-format-security \
+                  -Werror=return-type -Wno-format-security \
                   -std=gnu89
 KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_AFLAGS_KERNEL :=