Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Thu, 5 Jul 2018 09:58:48 -0700
From:   "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To:     Andrea Parri <andrea.parri@amarulasolutions.com>
Cc:     Alan Stern <stern@rowland.harvard.edu>,
        Will Deacon <will.deacon@arm.com>,
        LKMM Maintainers -- Akira Yokosawa <akiyks@gmail.com>,
        Boqun Feng <boqun.feng@gmail.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>,
        Kernel development list <linux-kernel@vger.kernel.org>,
        dlustig@nvidia.com
Subject: Re: [PATCH 2/2] tools/memory-model: Add write ordering by
 release-acquire and by locks
Reply-To: paulmck@linux.vnet.ibm.com
References: <20180704121103.GB26941@arm.com>
 <Pine.LNX.4.44L0.1807051010380.1697-100000@iolanthe.rowland.org>
 <20180705153140.GO3593@linux.vnet.ibm.com>
 <20180705153906.GA2345@andrea>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20180705153906.GA2345@andrea>
User-Agent: Mutt/1.5.21 (2010-09-15)
Message-Id: <20180705165848.GR3593@linux.vnet.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Thu, Jul 05, 2018 at 05:39:06PM +0200, Andrea Parri wrote:
> > > At any rate, it looks like instead of strengthening the relation, I
> > > should write a patch that removes it entirely.  I also will add new,
> > > stronger relations for use with locking, essentially making spin_lock
> > > and spin_unlock be RCsc.
> > 
> > Only in the presence of smp_mb__after_unlock_lock() or
> > smp_mb__after_spinlock(), correct?  Or am I confused about RCsc?
> 
> There are at least two definitions of RCsc: one as documented in the header
> comment for smp_mb__after_spinlock() or rather in the patch under review...,
> one as processor architects used to intend it. ;-)

Searching isn't working for me all that well this morning, so could you
please send me a pointer to that patch?

							Thanx, Paul