linux-kernel - Re: [tip:locking/core] tools/memory-model: Add extra ordering for locks and remove it for ordinary release/acquire

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Message-ID: <20210910171221.GN4323@worktop.programming.kicks-ass.net>
Date:   Fri, 10 Sep 2021 19:12:21 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alan Stern <stern@...land.harvard.edu>
Cc:     Boqun Feng <boqun.feng@...il.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Dan Lustig <dlustig@...dia.com>, Will Deacon <will@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Anvin <hpa@...or.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jiri Olsa <jolsa@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        linux-tip-commits@...r.kernel.org, palmer@...belt.com,
        paul.walmsley@...ive.com, mpe@...erman.id.au
Subject: Re: [tip:locking/core] tools/memory-model: Add extra ordering for
 locks and remove it for ordinary release/acquire

On Fri, Sep 10, 2021 at 12:36:32PM -0400, Alan Stern wrote:
> +Here the second spin_lock() is po-after the first spin_unlock(), and
> +therefore the load of x must execute before the load of y, even tbough

I think that's commonly spelled: though, right?                    ^^^^^^