linux-kernel - Re: [PATCH v2 2/4] net: i825xx: Use absolute_pointer for memcpy from fixed memory location

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Date:   Wed, 15 Sep 2021 09:08:19 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>,
        "James E . J . Bottomley" <James.Bottomley@...senpartnership.com>,
        Helge Deller <deller@....de>,
        "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        alpha <linux-alpha@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Parisc List <linux-parisc@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>, linux-sparse@...r.kernel.org
Subject: Re: [PATCH v2 2/4] net: i825xx: Use absolute_pointer for memcpy from
 fixed memory location

On Wed, Sep 15, 2021 at 5:52 AM Guenter Roeck <linux@...ck-us.net> wrote:
> gcc 11.x reports the following compiler warning/error.
>
> drivers/net/ethernet/i825xx/82596.c: In function 'i82596_probe':
>     ./arch/m68k/include/asm/string.h:72:25: error:
>             '__builtin_memcpy' reading 6 bytes from a region of size 0
>                     [-Werror=stringop-overread]
>
> Use absolute_pointer() to work around the problem.
>
> Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>

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