linux-kernel - Re: [PATCH v3 00/11] Introduce cmpxchg128() -- aka. the demise of cmpxchg

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Message-ID: <20230524093947.GQ83892@hirez.programming.kicks-ass.net>
Date:   Wed, 24 May 2023 11:39:47 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>, dennis@...nel.org,
        Tejun Heo <tj@...nel.org>, Christoph Lameter <cl@...ux.com>,
        Heiko Carstens <hca@...ux.ibm.com>, gor@...ux.ibm.com,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        borntraeger@...ux.ibm.com, Sven Schnelle <svens@...ux.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>, Joerg Roedel <joro@...tes.org>,
        suravee.suthikulpanit@....com, Robin Murphy <robin.murphy@....com>,
        David Woodhouse <dwmw2@...radead.org>,
        Baolu Lu <baolu.lu@...ux.intel.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        "David S . Miller" <davem@...emloft.net>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Roman Gushchin <roman.gushchin@...ux.dev>,
        Hyeonggon Yoo <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 <linux-arch@...r.kernel.org>,
        linux-crypto@...r.kernel.org, mpe@...erman.id.au
Subject: Re: [PATCH v3 00/11] Introduce cmpxchg128() -- aka. the demise of
 cmpxchg_double()

On Mon, May 15, 2023 at 11:42:23AM +0200, Arnd Bergmann wrote:

> The need for runtime feature checking in the callers on x86-64 is still
> a bit awkward, but this is no worse than before. I understand that
> turning this into a compile-time choice would require first settling
> a larger debate about raising the default target for distros beyond
> the current CONFIG_GENERIC_CPU.

Looks like Power is going to be in the same boat, they can do
cmpxchg128, but only for Power8+.