linux-kernel - [PATCH v2] kbuild: enforce -Werror=unused-result

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Date:   Fri, 19 Mar 2021 15:32:31 +0100
From:   Olaf Hering <olaf@...fle.de>
To:     linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Olaf Hering <olaf@...fle.de>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Subject: [PATCH v2] kbuild: enforce -Werror=unused-result

It is a hard error if a return value is ignored.
In case the return value has no meaning, remove the attribute.

Signed-off-by: Olaf Hering <olaf@...fle.de>
---
v2:
  resend

 Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Makefile b/Makefile
index a28bb374663d..9b7def6db494 100644
--- a/Makefile
+++ b/Makefile
@@ -495,7 +495,7 @@ KBUILD_AFLAGS   := -D__ASSEMBLY__ -fno-PIE
 KBUILD_CFLAGS   := -Wall -Wundef -Werror=strict-prototypes -Wno-trigraphs \
 		   -fno-strict-aliasing -fno-common -fshort-wchar -fno-PIE \
 		   -Werror=implicit-function-declaration -Werror=implicit-int \
-		   -Werror=return-type -Wno-format-security \
+		   -Werror=return-type -Werror=unused-result -Wno-format-security \
 		   -std=gnu89
 KBUILD_CPPFLAGS := -D__KERNEL__
 KBUILD_AFLAGS_KERNEL :=