linux-kernel - Re: [PATCH 11/13] x86_64: Remove pointless set

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Message-ID: <Y6CG4e6JteXc8ih5@hirez.programming.kicks-ass.net>
Date:   Mon, 19 Dec 2022 16:44:33 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Uros Bizjak <ubizjak@...il.com>, x86@...nel.org,
        willy@...radead.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        aarcange@...hat.com, kirill.shutemov@...ux.intel.com,
        jroedel@...e.de
Subject: Re: [PATCH 11/13] x86_64: Remove pointless set_64bit() usage

On Fri, Nov 04, 2022 at 10:15:08AM -0700, Linus Torvalds wrote:
> On Fri, Nov 4, 2022 at 9:01 AM Peter Zijlstra <peterz@...radead.org> wrote:
> >
> > So cmpxchg_double() does a cmpxchg on a double long value and is
> > currently supported by: i386, x86_64, arm64 and s390.
> >
> > On all those, except i386, two longs are u128.
> >
> > So how about we introduce u128 and cmpxchg128 -- then it directly
> > mirrors the u64 and cmpxchg64 usage we already have. It then also
> > naturally imposses the alignment thing.
> 
> Ack

Out now: https://lkml.kernel.org/r/20221219153525.632521981@infradead.org