linux-kernel - [PATCH] kbuild: Move -Wtype-limits to W=2

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Message-Id: <20200708190756.16810-1-rikard.falkeborn@gmail.com>
Date:   Wed,  8 Jul 2020 21:07:56 +0200
From:   Rikard Falkeborn <rikard.falkeborn@...il.com>
To:     torvalds@...ux-foundation.org
Cc:     akpm@...ux-foundation.org, andy.shevchenko@...il.com,
        arnd@...db.de, emil.l.velikov@...il.com, geert@...ux-m68k.org,
        keescook@...omium.org, linus.walleij@...aro.org,
        linux-kernel@...r.kernel.org, lkp@...el.com,
        mm-commits@...r.kernel.org, rikard.falkeborn@...il.com,
        syednwaris@...il.com, vilhelm.gray@...il.com,
        yamada.masahiro@...ionext.com, michal.lkml@...kovi.net,
        linux-kbuild@...r.kernel.org
Subject: [PATCH] kbuild: Move -Wtype-limits to W=2

-Wtype-limits is included in -Wextra which is added at W=1. It warns
(among other things) that 'comparison of an unsigned variable `< 0` is
always false. This causes noisy warnings, especially when used in
macros, hence it is more suitable for W=2.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@...il.com>
---
See also discussion at https://lore.kernel.org/lkml/CAHk-=wiKCXEWKJ9dWUimGbrVRo_N2RosESUw8E7m9AEtyZcu=w@mail.gmail.com/

 scripts/Makefile.extrawarn | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/scripts/Makefile.extrawarn b/scripts/Makefile.extrawarn
index 4aea7cf71d11..62c275685b75 100644
--- a/scripts/Makefile.extrawarn
+++ b/scripts/Makefile.extrawarn
@@ -35,6 +35,7 @@ KBUILD_CFLAGS += $(call cc-option, -Wstringop-truncation)
 # The following turn off the warnings enabled by -Wextra
 KBUILD_CFLAGS += -Wno-missing-field-initializers
 KBUILD_CFLAGS += -Wno-sign-compare
+KBUILD_CFLAGS += -Wno-type-limits
 
 KBUILD_CPPFLAGS += -DKBUILD_EXTRA_WARN1
 
@@ -66,6 +67,7 @@ KBUILD_CFLAGS += -Wshadow
 KBUILD_CFLAGS += $(call cc-option, -Wlogical-op)
 KBUILD_CFLAGS += -Wmissing-field-initializers
 KBUILD_CFLAGS += -Wsign-compare
+KBUILD_CFLAGS += -Wtype-limits
 KBUILD_CFLAGS += $(call cc-option, -Wmaybe-uninitialized)
 KBUILD_CFLAGS += $(call cc-option, -Wunused-macros)
 
-- 
2.27.0