linux-kernel - [PATCH 03/12] kbuild: turn on -Wextra by default

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Message-Id: <20240326145140.3257163-2-arnd@kernel.org>
Date: Tue, 26 Mar 2024 15:51:28 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: linux-kbuild@...r.kernel.org,
	Masahiro Yamada <masahiroy@...nel.org>
Cc: Nicolas Schier <nicolas@...sle.eu>,
	Nathan Chancellor <nathan@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/12] kbuild: turn on -Wextra by default

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

The -Wextra option controls a number of different warnings that differ
slightly by compiler version. Some are useful in general, others are
better left at W=1 or higher. Based on earlier work, the ones that
should be disabled by default are left for the higher warning levels
already, and a lot of the useful ones have no remaining output when
enabled.

Move the -Wextra option up into the set of default-enabled warnings
and just rely on the individual ones getting disabled as needed.

The -Wunused warning was always grouped with this, so turn it on
by default as well, except for the -Wunused-parameter warning that
really has no value at all for the kernel since many interfaces
have intentionally unused arguments.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 scripts/Makefile.extrawarn | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index c5af566e911a..c247552c192c 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -82,12 +82,14 @@ KBUILD_CFLAGS += $(call cc-option,-Werror=designated-init)
 # Warn if there is an enum types mismatch
 KBUILD_CFLAGS += $(call cc-option,-Wenum-conversion)

+KBUILD_CFLAGS += -Wextra
+KBUILD_CFLAGS += -Wunused
+
 #
 # W=1 - warnings which may be relevant and do not occur too often
 #
 ifneq ($(findstring 1, $(KBUILD_EXTRA_WARN)),)

-KBUILD_CFLAGS += -Wextra -Wunused -Wno-unused-parameter
 KBUILD_CFLAGS += $(call cc-option, -Wrestrict)
 KBUILD_CFLAGS += -Wmissing-format-attribute
 KBUILD_CFLAGS += -Wold-style-definition
@@ -190,6 +192,7 @@ else

 # The following turn off the warnings enabled by -Wextra
 KBUILD_CFLAGS += -Wno-sign-compare
+KBUILD_CFLAGS += -Wno-unused-parameter

 endif

-- 
2.39.2