linux-kernel - Re: locking/atomic: Introduce atomic_try

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Message-ID: <CA+55aFyeUj4KTtnqWawdSz3apNy+N=Di9cK_jUzWLag-wZ7cPQ@mail.gmail.com>
Date:   Fri, 24 Mar 2017 13:58:53 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Andy Lutomirski <luto@...capital.net>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>,
        Brian Gerst <brgerst@...il.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Paul McKenney <paulmck@...ux.vnet.ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: locking/atomic: Introduce atomic_try_cmpxchg()

On Fri, Mar 24, 2017 at 1:46 PM, Peter Zijlstra <peterz@...radead.org> wrote:
>
> I certainly like it better, but so far I'm having trouble reproducing
> your results. What compiler version are you on?

I have:

    gcc version 6.3.1 20161221 (Red Hat 6.3.1-1) (GCC)

from

    gcc-6.3.1-1.fc24.x86_64

and I'm attaching the edited form of your test-case, just so that
we're on the exact same page.

                 Linus

View attachment "tiny.c" of type "text/x-csrc" (1204 bytes)