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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?
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