linux-kernel - Re: [PATCH 2/2] tools/memory-model: Add write ordering by release-acquire and by locks

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Message-Id: <20180705165848.GR3593@linux.vnet.ibm.com>
Date:   Thu, 5 Jul 2018 09:58:48 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Andrea Parri <andrea.parri@...rulasolutions.com>
Cc:     Alan Stern <stern@...land.harvard.edu>,
        Will Deacon <will.deacon@....com>,
        LKMM Maintainers -- Akira Yokosawa <akiyks@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        David Howells <dhowells@...hat.com>,
        Jade Alglave <j.alglave@....ac.uk>,
        Luc Maranget <luc.maranget@...ia.fr>,
        Nicholas Piggin <npiggin@...il.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Kernel development list <linux-kernel@...r.kernel.org>,
        dlustig@...dia.com
Subject: Re: [PATCH 2/2] tools/memory-model: Add write ordering by
 release-acquire and by locks

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