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Date:   Tue, 11 May 2021 11:00:22 +0100
From:   Mark Rutland <mark.rutland@arm.com>
To:     Geert Uytterhoeven <geert@linux-m68k.org>
Cc:     Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Will Deacon <will@kernel.org>,
        Boqun Feng <boqun.feng@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Albert Ou <aou@eecs.berkeley.edu>,
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        Brian Cain <bcain@codeaurora.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
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        Yoshinori Sato <ysato@users.sourceforge.jp>
Subject: Re: [PATCH 20/33] locking/atomic: m68k: move to ARCH_ATOMIC
Message-ID: <20210511100022.GD6152@C02TD0UTHF1T.local>
References: <20210510093753.40683-1-mark.rutland@arm.com>
 <20210510093753.40683-21-mark.rutland@arm.com>
 <CAMuHMdVFOvyQYBn45QSb-jHA3G5Guv0hRb-LO1n8L_gWzcZm8w@mail.gmail.com>
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On Tue, May 11, 2021 at 11:27:45AM +0200, Geert Uytterhoeven wrote:
> Hi Mark,

Hi Geert,

> On Mon, May 10, 2021 at 11:42 AM Mark Rutland <mark.rutland@arm.com> wrote:
> > We'd like all architectures to convert to ARCH_ATOMIC, as once all
> > architectures are converted it will be possible to make significant
> > cleanups to the atomics headers, and this will make it much easier to
> > generically enable atomic functionality (e.g. debug logic in the
> > instrumented wrappers).
> >
> > As a step towards that, this patch migrates m68k to ARCH_ATOMIC. The
> > arch code provides arch_{atomic,atomic64,xchg,cmpxchg}*(), and common
> > code wraps these with optional instrumentation to provide the regular
> > functions.
> >
> > Signed-off-by: Mark Rutland <mark.rutland@arm.com>
> 
> Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
> 
> I even gave this series a spin on ARAnyM and QEMU, and everything
> seems to be fine.

Thanks! That's much appreciated; I was able to build-test, but didn't
have a suitable setup for boot testing.

The Kbuild test robot noticed I broke one configuration by renaming 
atomic_dec_and_test_lt(), since it's not part of the common atomic API,
and is used in get_mmu_context() in <asm/mmu_context.h>.

On the primciple of keeping the common atomic API separate from
arch-specific bits, I've kept the `arch_` prefix and updated the caller.
Does that sound good to you?

Thanks,
Mark.