linux-kernel - Re: [PATCH] m68k: avoid xchg() warning

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Date:   Mon, 12 Oct 2020 15:18:44 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Greg Ungerer <gerg@...ux-m68k.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] m68k: avoid xchg() warning

On Thu, Oct 8, 2020 at 2:34 PM Arnd Bergmann <arnd@...db.de> wrote:
> gcc warns about the value of xchg()/cmpxchg() being unused
> in some cases:
>
> net/core/filter.c: In function 'bpf_clear_redirect_map':
> arch/m68k/include/asm/cmpxchg.h:137:3: warning: value computed is not used [-Wunused-value]
>   106 | #define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
> net/core/filter.c:3595:4: note: in expansion of macro 'cmpxchg'
>  3595 |    cmpxchg(&ri->map, map, NULL);
>
> Shut up that warning like we do on other architectures, by
> turning the macro into a statement expression.
>
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
i.e. will queue in the m68k for-v5.11 branch.

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