linux-kernel - Re: [PATCH v4 2/3] build_bug.h: remove negative-array fallback for BUILD_BUG

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Message-ID: <CANiq72m24uArkvc-GYMa8j=C+fUfxCXm27nVsg1B-o0r3EDKEw@mail.gmail.com>
Date:   Sat, 24 Nov 2018 09:16:50 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>, josh@...htriplett.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 2/3] build_bug.h: remove negative-array fallback for BUILD_BUG_ON()

On Thu, Nov 22, 2018 at 5:15 PM Masahiro Yamada
<yamada.masahiro@...ionext.com> wrote:
>
> The kernel can only be compiled with an optimization option (-O2, -Os,
> or the currently proposed -Og). Hence, __OPTIMIZE__ is always defined
> in the kernel source.
>
> The fallback for the -O0 case is just hypothetical and pointless.
> Moreover, commit 0bb95f80a38f ("Makefile: Globally enable VLA warning")
> enabled -Wvla warning. The use of variable length arrays is banned.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
> Acked-by: Kees Cook <keescook@...omium.org>
> Reviewed-by: Nick Desaulniers <ndesaulniers@...gle.com>
> Tested-by: Nick Desaulniers <ndesaulniers@...gle.com>

Didn't see v3/v4 (wasn't CC):

Acked-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>

Cheers,
Miguel