linux-kernel - Re: [PATCH 5/8] x86: switch atomic.h to use atomic-instrumented.h

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Date:   Fri, 26 May 2017 21:28:56 +0200
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Will Deacon <will.deacon@....com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev <kasan-dev@...glegroups.com>,
        LKML <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>
Subject: Re: [PATCH 5/8] x86: switch atomic.h to use atomic-instrumented.h

On Wed, Mar 29, 2017 at 3:37 PM, Mark Rutland <mark.rutland@....com> wrote:
> On Tue, Mar 28, 2017 at 06:25:07PM +0200, Dmitry Vyukov wrote:
>> On Tue, Mar 28, 2017 at 6:15 PM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
>
>> >  #define __try_cmpxchg(ptr, pold, new, size)                            \
>> >         __raw_try_cmpxchg((ptr), (pold), (new), (size), LOCK_PREFIX)
>> >
>> > -#define try_cmpxchg(ptr, pold, new)                                    \
>> > +#define arch_try_cmpxchg(ptr, pold, new)                               \
>> >         __try_cmpxchg((ptr), (pold), (new), sizeof(*(ptr)))
>>
>> Is try_cmpxchg() a part of public interface like cmpxchg, or only a
>> helper to implement atomic_try_cmpxchg()?
>> If it's the latter than we don't need to wrap them.
>
> De-facto, it's an x86-specific helper. It was added in commit:
>
>     a9ebf306f52c756c ("locking/atomic: Introduce atomic_try_cmpxchg()")
>
> ... which did not add try_cmpxchg to any generic header.
>
> If it was meant to be part of the public interface, we'd need a generic
> definition.

Fixed in v2:
https://groups.google.com/forum/#!topic/kasan-dev/3PoGcuMku-w