linux-kernel - Re: Unlock-lock questions and the Linux Kernel Memory Model

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Message-ID: <20171130091532.qdczu5zz43okruu6@hirez.programming.kicks-ass.net>
Date:   Thu, 30 Nov 2017 10:15:32 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Daniel Lustig <dlustig@...dia.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Andrea Parri <parri.andrea@...il.com>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Jade Alglave <j.alglave@....ac.uk>,
        Nicholas Piggin <npiggin@...il.com>,
        Will Deacon <will.deacon@....com>,
        David Howells <dhowells@...hat.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: Unlock-lock questions and the Linux Kernel Memory Model

On Thu, Nov 30, 2017 at 04:55:09PM +0800, Boqun Feng wrote:
> But in case of AMOs, which directly send the addition request to memory
> controller, so there wouldn't be any read part or even write part of the
> atomic_inc() executed by CPU. Would this be allowed then?

Personally I bloody hate AMOs that don't respect the normal way of
things.