linux-kernel - [PATCH] Kbuild: enable -Wfallthrough for clang

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Date:   Fri,  6 Nov 2020 23:07:44 -0800
From:   Nick Desaulniers <ndesaulniers@...gle.com>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     "Gustavo A . R . Silva" <gustavoars@...nel.org>,
        Joe Perches <joe@...ches.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nathan Chancellor <natechancellor@...il.com>,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: [PATCH] Kbuild: enable -Wfallthrough for clang

Partial revert of commit e2079e93f562 ("kbuild: Do not enable
-Wimplicit-fallthrough for clang for now")

This has been fixed up over time thanks to the addition of "fallthrough"
pseudo-keyword in
commit 294f69e662d1 ("compiler_attributes.h: Add 'fallthrough' pseudo
keyword for switch/case use")

Link: https://github.com/ClangBuiltLinux/linux/issues/236
Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
---
 Makefile | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/Makefile b/Makefile
index f353886dbf44..c1c61c276f60 100644
--- a/Makefile
+++ b/Makefile
@@ -777,11 +777,6 @@ else
 # These warnings generated too much noise in a regular build.
 # Use make W=1 to enable them (see scripts/Makefile.extrawarn)
 KBUILD_CFLAGS += -Wno-unused-but-set-variable
-
-# Warn about unmarked fall-throughs in switch statement.
-# Disabled for clang while comment to attribute conversion happens and
-# https://github.com/ClangBuiltLinux/linux/issues/636 is discussed.
-KBUILD_CFLAGS += $(call cc-option,-Wimplicit-fallthrough,)
 endif
 
 KBUILD_CFLAGS += $(call cc-disable-warning, unused-const-variable)
-- 
2.29.2.222.g5d2a92d10f8-goog