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Date:   Mon, 15 Apr 2019 09:50:03 -0400 (EDT)
From:   Alan Stern <stern@rowland.harvard.edu>
To:     "Paul E. McKenney" <paulmck@linux.ibm.com>
cc:     Andrea Parri <andrea.parri@amarulasolutions.com>,
        LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
        Boqun Feng <boqun.feng@gmail.com>,
        Daniel Lustig <dlustig@nvidia.com>,
        David Howells <dhowells@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Luc Maranget <luc.maranget@inria.fr>,
        Nicholas Piggin <npiggin@gmail.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Will Deacon <will.deacon@arm.com>,
        Daniel Kroening <kroening@cs.ox.ac.uk>,
        Kernel development list <linux-kernel@vger.kernel.org>
Subject: Re: Adding plain accesses and detecting data races in the LKMM
In-Reply-To: <20190415133535.GU14111@linux.ibm.com>
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On Mon, 15 Apr 2019, Paul E. McKenney wrote:

> Another question is "should the kernel permit smp_mb__{before,after}*()
> anywhere other than immediately before or after the primitive being
> strengthened?"
> 
> Thoughts?

How would the kernel forbid other constructions?

Alan