linux-kernel - Re: [PATCH] locking/atomic/x86: Introduce try

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Message-ID: <20220510165506.GP76023@worktop.programming.kicks-ass.net>
Date:   Tue, 10 May 2022 18:55:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Uros Bizjak <ubizjak@...il.com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>, Will Deacon <will@...nel.org>,
        Boqun Feng <boqun.feng@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Marco Elver <elver@...gle.com>
Subject: Re: [PATCH] locking/atomic/x86: Introduce try_cmpxchg64

On Tue, May 10, 2022 at 05:42:17PM +0200, Uros Bizjak wrote:
> This patch adds try_cmpxchg64 to improve code around cmpxchg8b.  While
> the resulting code improvements on x86_64 are minor (a compare and a move saved),
> the improvements on x86_32 are quite noticeable. The code improves from:

What user of cmpxchg64 is this?