linux-kernel - Re: [PATCH 20/33] locking/atomic: m68k: move to ARCH

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Date:   Tue, 11 May 2021 11:00:22 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Arnd Bergmann <arnd@...db.de>,
        Brian Cain <bcain@...eaurora.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Chris Zankel <chris@...kel.net>, Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Vincent Chen <deanbo422@...il.com>,
        Helge Deller <deller@....de>,
        Greentime Hu <green.hu@...il.com>, Guo Ren <guoren@...nel.org>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        James Bottomley <James.Bottomley@...senpartnership.com>,
        Max Filippov <jcmvbkbc@...il.com>,
        Jonas Bonn <jonas@...thpole.se>,
        Ley Foon Tan <ley.foon.tan@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Matt Turner <mattst88@...il.com>,
        Michal Simek <monstr@...str.eu>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nick Hu <nickhu@...estech.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Richard Henderson <rth@...ddle.net>,
        Stafford Horne <shorne@...il.com>,
        Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Vineet Gupta <vgupta@...opsys.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>
Subject: Re: [PATCH 20/33] locking/atomic: m68k: move to ARCH_ATOMIC

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