linux-kernel - Re: [PATCH 2/2] m68k: add memcmp() declarartion

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Date:   Wed, 16 Aug 2023 17:42:45 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-m68k@...ts.linux-m68k.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] m68k: add memcmp() declarartion

Hi Arnd,

On Wed, Aug 9, 2023 at 11:11 PM Arnd Bergmann <arnd@...nel.org> wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> There is a global definition of memcmp() that gets built on m68k but is never
> used and causes a warning because of the missing prototype:
>
> lib/string.c:671:15: error: no previous prototype for 'memcmp' [-Werror=missing-prototypes]
>
> Add the corresponding declaration to avoid the warning. As far as I understand
> the #define to redirect memcmp() to __builtin_memcmp() does not actually do anything
> here since this is what it does anyway.

I believe it does with -ffreestanding?
So if you don't mind, I'd like to apply this with that sentence removed.

x86 also still has that define in string_32.h.
Andi dropped it for amd64 in commit 6edfba1b33c70110
("[PATCH] x86_64: Don't define string functions to builtin")
in v2.6.17.

> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
i.e. will queue in the m68k for-v6.6 branch, with the obvious typo fixed.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds