linux-kernel - Re: [PATCH 00/18] locking/atomic: atomic64 type cleanup

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Date:   Wed, 22 May 2019 23:18:59 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Will Deacon <will.deacon@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        David Miller <davem@...emloft.net>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        James Hogan <jhogan@...nel.org>,
        Russell King - ARM Linux <linux@...linux.org.uk>,
        Matt Turner <mattst88@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Burton <paul.burton@...s.com>,
        Paul Mackerras <paulus@...ba.org>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Richard Henderson <rth@...ddle.net>,
        "# 3.4.x" <stable@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tony Luck <tony.luck@...el.com>,
        Vineet Gupta <vgupta@...opsys.com>
Subject: Re: [PATCH 00/18] locking/atomic: atomic64 type cleanup

On Wed, May 22, 2019 at 3:23 PM Mark Rutland <mark.rutland@....com> wrote:
>
> Currently architectures return inconsistent types for atomic64 ops. Some return
> long (e..g. powerpc), some return long long (e.g. arc), and some return s64
> (e.g. x86).
>
> This is a bit messy, and causes unnecessary pain (e.g. as values must be cast
> before they can be printed [1]).
>
> This series reworks all the atomic64 implementations to use s64 as the base
> type for atomic64_t (as discussed [2]), and to ensure that this type is
> consistently used for parameters and return values in the API, avoiding further
> problems in this area.
>
> This series (based on v5.1-rc1) can also be found in my atomics/type-cleanup
> branch [3] on kernel.org.

Nice cleanup!

I've provided an explicit Ack for the asm-generic patch if someone wants
to pick up the entire series, but I can also put it all into my asm-generic
tree if you want, after more people have had a chance to take a look.

     Arnd