linux-kernel - Re: [PATCH v2 03/10] arch: Introduce arch_{,try_}_cmpxchg128{,

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Date:   Thu, 2 Feb 2023 18:04:43 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     torvalds@...ux-foundation.org, corbet@....net, will@...nel.org,
        boqun.feng@...il.com, mark.rutland@....com,
        catalin.marinas@....com, dennis@...nel.org, tj@...nel.org,
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        borntraeger@...ux.ibm.com, svens@...ux.ibm.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, dave.hansen@...ux.intel.com,
        x86@...nel.org, hpa@...or.com, joro@...tes.org,
        suravee.suthikulpanit@....com, robin.murphy@....com,
        dwmw2@...radead.org, baolu.lu@...ux.intel.com,
        Arnd Bergmann <arnd@...db.de>,
        Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
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        Andrew Morton <akpm@...ux-foundation.org>, vbabka@...e.cz,
        roman.gushchin@...ux.dev, 42.hyeyoo@...il.com,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-s390@...r.kernel.org,
        iommu@...ts.linux.dev, linux-arch@...r.kernel.org,
        linux-crypto@...r.kernel.org
Subject: Re: [PATCH v2 03/10] arch: Introduce
 arch_{,try_}_cmpxchg128{,_local}()

On Thu, Feb 02, 2023 at 03:50:33PM +0100, Peter Zijlstra wrote:
> For all architectures that currently support cmpxchg_double()
> implement the cmpxchg128() family of functions that is basically the
> same but with a saner interface.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  arch/arm64/include/asm/atomic_ll_sc.h |   41 +++++++++++++++++++++++++
>  arch/arm64/include/asm/atomic_lse.h   |   31 +++++++++++++++++++
>  arch/arm64/include/asm/cmpxchg.h      |   26 ++++++++++++++++
>  arch/s390/include/asm/cmpxchg.h       |   14 ++++++++
>  arch/x86/include/asm/cmpxchg_32.h     |    3 +
>  arch/x86/include/asm/cmpxchg_64.h     |   55 +++++++++++++++++++++++++++++++++-
>  6 files changed, 168 insertions(+), 2 deletions(-)

For s390:
Acked-by: Heiko Carstens <hca@...ux.ibm.com>