linux-kernel - Re: [PATCH tip/core/rcu 16/27] rcu: Add comment documenting how rcu_seq

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Message-ID: <20180626201503.GS2494@hirez.programming.kicks-ass.net>
Date:   Tue, 26 Jun 2018 22:15:03 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, rostedt@...dmis.org,
        dhowells@...hat.com, edumazet@...gle.com, fweisbec@...il.com,
        oleg@...hat.com, joel@...lfernandes.org
Subject: Re: [PATCH tip/core/rcu 16/27] rcu: Add comment documenting how
 rcu_seq_snap works

On Tue, Jun 26, 2018 at 12:31:46PM -0700, Paul E. McKenney wrote:
> > Then the existing comment is misleading and really needs change.
> 
> Would it be sufficient to add something like "The memory barrier is
> required to support the many-to-many ordering guaranteed by RCU grace
> periods"?

What would lead me to wonder why after the load and not (also) before.