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Date:   Thu, 28 Jun 2018 06:02:58 -0700
From:   Matthew Wilcox <willy@infradead.org>
To:     Andrea Parri <andrea.parri@amarulasolutions.com>
Cc:     linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Will Deacon <will.deacon@arm.com>,
        Alan Stern <stern@rowland.harvard.edu>,
        Boqun Feng <boqun.feng@gmail.com>,
        Nicholas Piggin <npiggin@gmail.com>,
        David Howells <dhowells@redhat.com>,
        Jade Alglave <j.alglave@ucl.ac.uk>,
        Luc Maranget <luc.maranget@inria.fr>,
        "Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
        Akira Yokosawa <akiyks@gmail.com>,
        Daniel Lustig <dlustig@nvidia.com>,
        Jonathan Corbet <corbet@lwn.net>,
        Randy Dunlap <rdunlap@infradead.org>
Subject: Re: [PATCH 2/3] locking: Clarify requirements for
 smp_mb__after_spinlock()
Message-ID: <20180628130258.GF7646@bombadil.infradead.org>
References: <1530182480-13205-1-git-send-email-andrea.parri@amarulasolutions.com>
 <1530182480-13205-3-git-send-email-andrea.parri@amarulasolutions.com>
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On Thu, Jun 28, 2018 at 12:41:19PM +0200, Andrea Parri wrote:
> + * smp_mb__after_spinlock() provides a full memory barrier between po-earlier
> + * lock acquisitions and po-later memory accesses.

What does po-earlier mean?  Partial order?