linux-kernel - Re: [PATCH 1/4] [v4] Kbuild: add -Wno-shift-negative-value where -Wextra is used

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Date:   Wed, 9 Mar 2022 17:47:13 +0100
From:   David Sterba <dsterba@...e.cz>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Masahiro Yamada <masahiroy@...nel.org>, alexs@...nel.org,
        arnd@...db.de, dsterba@...e.com, elver@...gle.com,
        jani.nikula@...el.com, linux-doc@...r.kernel.org,
        linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, mark.rutland@....com,
        ndesaulniers@...gle.com, ojeda@...nel.org,
        torvalds@...ux-foundation.org
Subject: Re: [PATCH 1/4] [v4] Kbuild: add -Wno-shift-negative-value where
 -Wextra is used

On Tue, Mar 08, 2022 at 10:56:12PM +0100, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> As a preparation for moving to -std=gnu11, turn off the
> -Wshift-negative-value option. This warning is enabled by gcc when
> building with -Wextra for c99 or higher, but not for c89. Since
> the kernel already relies on well-defined overflow behavior,
> the warning is not helpful and can simply be disabled in
> all locations that use -Wextra.
> 
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
> [v4]
>   split into a separate patch
> ---
>  drivers/gpu/drm/i915/Makefile          | 1 +
>  drivers/staging/greybus/tools/Makefile | 3 ++-

For

>  fs/btrfs/Makefile                      | 1 +

Acked-by: David Sterba <dsterba@...e.com>