linux-kernel - Re: [RFC][PATCH 07/12] percpu: Wire up cmpxchg128

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Date:   Mon, 9 Jan 2023 17:29:55 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Heiko Carstens <hca@...ux.ibm.com>
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,
        cl@...ux.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        borntraeger@...ux.ibm.com, svens@...ux.ibm.com,
        Herbert Xu <herbert@...dor.apana.org.au>, davem@...emloft.net,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
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        robin.murphy@....com, dwmw2@...radead.org,
        baolu.lu@...ux.intel.com, Arnd Bergmann <arnd@...db.de>,
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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,
        linux-crypto@...r.kernel.org, iommu@...ts.linux.dev,
        linux-arch@...r.kernel.org
Subject: Re: [RFC][PATCH 07/12] percpu: Wire up cmpxchg128

On Wed, Jan 04, 2023 at 01:09:16PM +0100, Heiko Carstens wrote:
> On Mon, Dec 19, 2022 at 04:35:32PM +0100, Peter Zijlstra wrote:
> > In order to replace cmpxchg_double() with the newly minted
> > cmpxchg128() family of functions, wire it up in this_cpu_cmpxchg().
> > 
> > Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ...
> > --- a/arch/s390/include/asm/percpu.h
> > +++ b/arch/s390/include/asm/percpu.h
> > +#define this_cpu_cmpxchg_16(pcp, oval, nval)				\
> > +({									\
> > +	u128 old__ = __pcpu_cast_128((nval), (nval));			\
> > +	u128 new__ = __pcpu_cast_128((oval), (oval));			\
> 
> spot the bug... please merge the below into this patch.

D'oh, luckily I got a fresh pile of brown paper bags for xmas.