linux-kernel - Re: [PATCH 28/33] locking/atomic: riscv: move to ARCH

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Date:   Mon, 24 May 2021 13:10:34 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Palmer Dabbelt <palmer@...belt.com>
Cc:     linux-kernel@...r.kernel.org, will@...nel.org,
        boqun.feng@...il.com, peterz@...radead.org, aou@...s.berkeley.edu,
        Arnd Bergmann <arnd@...db.de>, bcain@...eaurora.org,
        benh@...nel.crashing.org, chris@...kel.net, dalias@...c.org,
        davem@...emloft.net, deanbo422@...il.com, deller@....de,
        geert@...ux-m68k.org, green.hu@...il.com, guoren@...nel.org,
        ink@...assic.park.msu.ru, James.Bottomley@...senPartnership.com,
        jcmvbkbc@...il.com, jonas@...thpole.se, ley.foon.tan@...el.com,
        linux@...linux.org.uk, mattst88@...il.com, monstr@...str.eu,
        mpe@...erman.id.au, nickhu@...estech.com, paulus@...ba.org,
        Paul Walmsley <paul.walmsley@...ive.com>, rth@...ddle.net,
        shorne@...il.com, stefan.kristiansson@...nalahti.fi,
        tsbogend@...ha.franken.de, vgupta@...opsys.com,
        ysato@...rs.sourceforge.jp
Subject: Re: [PATCH 28/33] locking/atomic: riscv: move to ARCH_ATOMIC

On Sat, May 22, 2021 at 12:02:45PM -0700, Palmer Dabbelt wrote:
> On Mon, 10 May 2021 02:37:48 PDT (-0700), 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 riscv 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>
> > Cc: Albert Ou <aou@...s.berkeley.edu>
> > Cc: Boqun Feng <boqun.feng@...il.com>
> > Cc: Palmer Dabbelt <palmer@...belt.com>
> > Cc: Paul Walmsley <paul.walmsley@...ive.com>
> > Cc: Peter Zijlstra <peterz@...radead.org>
> > Cc: Will Deacon <will@...nel.org>
> > ---
> >  arch/riscv/Kconfig               |   1 +
> >  arch/riscv/include/asm/atomic.h  | 128 +++++++++++++++++++--------------------
> >  arch/riscv/include/asm/cmpxchg.h |  34 +++++------
> >  3 files changed, 82 insertions(+), 81 deletions(-)

[...]

> Reviewed-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
> Acked-by: Palmer Dabbelt <palmerdabbelt@...gle.com>

Thanks!

> Sorry this took a bit, I had this put on the slow queue because I thought it
> would conflict with Guo's patch set but from reading the rest of that thread
> it appears this is just supersedes which makes things much simpler.
> 
> I'm assuming this would be for 5.14, and you'd be merging it along with the
> prep work?

Yup; the plan is to take the whole series through the tip tree for
v5.14.

I'll post a v2 soon with some minor fixups.

> I don't think we have anything else in the works that would
> require atomic changes for 5.14 yet so that seems OK for now, but it'd be
> nice to have some shared tag I could pull in both so I can test this and in
> case we have more to put on top of it.  I'm fine waiting until something
> comes up if that's a headache on your end, though.

I think we can arrange a stable tag soon.

The Kbuild test robot is still finding a few edge cases with the
preprocessor glue on a few architectures, so my branch isn't stable yet,
but I think the core bit is solid, so if you wanted to test you should
be able to fetch my branch from:

  git://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git atomics/arch-atomic

Thanks,
Mark.