linux-kernel - Re: [PATCH 04/13] atomics/treewide: make atomic_fetch_add

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Message-ID: <CAMuHMdUxahNNq=NiOX8eYtgWbtDOBToV633opkR65aXvDj82Tw@mail.gmail.com>
Date:   Wed, 23 May 2018 16:02:46 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Vineet Gupta <vgupta@...opsys.com>
Subject: Re: [PATCH 04/13] atomics/treewide: make atomic_fetch_add_unless() optional

On Wed, May 23, 2018 at 3:35 PM, Mark Rutland <mark.rutland@....com> wrote:
> Several architectures these have a near-identical implementation based
> on atomic_read() and atomic_cmpxchg() that we can instead define in
> <linux/atomic.h>, so let's do so, using something close to the existing
> x86 implementation with try_cmpxchg().
>
> Where an architecture provides its own atomic_fetch_add_unless(), it
> must define a preprocessor symbol for it. The instrumented atomics are
> updated accordingly.
>
> Note that arch/arc's existing atomic_fetch_add_unless() had redundant
> barriers, as these are already present in its atomic_cmpxchg()
> implementation.
>
> There should be no functional change as a result of this patch.
>
> Signed-off-by: Mark Rutland <mark.rutland@....com>

>  arch/m68k/include/asm/atomic.h            | 15 ---------------
>  include/linux/atomic.h                    | 23 +++++++++++++++++++++++

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