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

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Date:   Wed, 8 Jul 2020 23:00:50 +0300
From:   Andy Shevchenko <andy.shevchenko@...il.com>
To:     Rikard Falkeborn <rikard.falkeborn@...il.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Emil Velikov <emil.l.velikov@...il.com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Kees Cook <keescook@...omium.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        kbuild test robot <lkp@...el.com>,
        mm-commits@...r.kernel.org,
        Syed Nayyar Waris <syednwaris@...il.com>,
        William Breathitt Gray <vilhelm.gray@...il.com>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Michal Marek <michal.lkml@...kovi.net>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>
Subject: Re: [PATCH] kbuild: Move -Wtype-limits to W=2

On Wed, Jul 8, 2020 at 10:08 PM Rikard Falkeborn
<rikard.falkeborn@...il.com> wrote:
>
> -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.
>

Suggested-by: Arnd ?

LGTM!

> 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
>


-- 
With Best Regards,
Andy Shevchenko