linux-kernel - Re: [PATCH tip/core/rcu 1/9] rcu: Provide GP ordering in face of migrations and delays

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Message-ID: <20171005162514.moaa24mn2pkto5fv@hirez.programming.kicks-ass.net>
Date:   Thu, 5 Oct 2017 18:25:14 +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
Subject: Re: [PATCH tip/core/rcu 1/9] rcu: Provide GP ordering in face of
 migrations and delays

On Thu, Oct 05, 2017 at 09:19:09AM -0700, Paul E. McKenney wrote:
> 
> Yes, the ordering does need to be visible to uninvolved CPUs, so
> release-acquire is not necessarily strong enough.

Why? Because I'm not at all seeing why it needs more. Your Changelog
doesn't provide enough hints.