linux-kernel - Re: [RFC][PATCH 11/12] slub: Replace cmpxchg

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Message-ID: <Y7Ri+Uij1GFkI/LB@osiris>
Date:   Tue, 3 Jan 2023 18:16:41 +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,
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        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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        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,
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        linux-arch@...r.kernel.org
Subject: Re: [RFC][PATCH 11/12] slub: Replace cmpxchg_double()

On Mon, Dec 19, 2022 at 04:35:36PM +0100, Peter Zijlstra wrote:
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---
>  include/linux/slub_def.h |   12 ++-
>  mm/slab.h                |   41 +++++++++++--
>  mm/slub.c                |  146 ++++++++++++++++++++++++++++-------------------
>  3 files changed, 135 insertions(+), 64 deletions(-)

Does this actually work? Just wondering since I end up with an instant
list corruption on s390. Might be endianness related, but I can't see
anything obvious at a first glance.