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From:   Geert Uytterhoeven <geert@linux-m68k.org>
Date:   Tue, 11 May 2021 12:27:18 +0200
Message-ID: <CAMuHMdV5LpRbDcbmQHP4gzXv6JiLzKNP8dAiMOa0GsfE5KgJzA@mail.gmail.com>
Subject: Re: [PATCH 20/33] locking/atomic: m68k: move to ARCH_ATOMIC
To:     Mark Rutland <mark.rutland@arm.com>
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>,
        Arnd Bergmann <arnd@arndb.de>,
        Brian Cain <bcain@codeaurora.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Chris Zankel <chris@zankel.net>, Rich Felker <dalias@libc.org>,
        "David S. Miller" <davem@davemloft.net>,
        Vincent Chen <deanbo422@gmail.com>,
        Helge Deller <deller@gmx.de>,
        Greentime Hu <green.hu@gmail.com>, Guo Ren <guoren@kernel.org>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        James Bottomley <James.Bottomley@hansenpartnership.com>,
        Max Filippov <jcmvbkbc@gmail.com>,
        Jonas Bonn <jonas@southpole.se>,
        Ley Foon Tan <ley.foon.tan@intel.com>,
        Russell King <linux@armlinux.org.uk>,
        Matt Turner <mattst88@gmail.com>,
        Michal Simek <monstr@monstr.eu>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Nick Hu <nickhu@andestech.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Mackerras <paulus@samba.org>,
        Paul Walmsley <paul.walmsley@sifive.com>,
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        Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Vineet Gupta <vgupta@synopsys.com>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Greg Ungerer <gerg@linux-m68k.org>
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Hi Mark,

CC Greg

On Tue, May 11, 2021 at 12:00 PM Mark Rutland <mark.rutland@arm.com> wrote:
> On Tue, May 11, 2021 at 11:27:45AM +0200, Geert Uytterhoeven wrote:
> > 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>.

Ah, that's in the part for Coldfire, so I (and my builds) didn't notice.

> 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?

That's fine for me, but as this is Coldfire, I'd like to defer to Greg.

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-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