linux-kernel - Re: [PATCH 4/4] locking: Introduce smp_cond

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Message-ID: <20151112145013.GB17308@twins.programming.kicks-ass.net>
Date:	Thu, 12 Nov 2015 15:50:13 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, Boqun Feng <boqun.feng@...il.com>,
	mingo@...nel.org, linux-kernel@...r.kernel.org, corbet@....net,
	mhocko@...nel.org, dhowells@...hat.com,
	torvalds@...ux-foundation.org, will.deacon@....com,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH 4/4] locking: Introduce smp_cond_acquire()

On Thu, Nov 12, 2015 at 06:40:04AM -0800, Paul E. McKenney wrote:
> I cannot resist suggesting that any lock that interacts with
> spin_unlock_wait() must have all relevant acquisitions followed by
> smp_mb__after_unlock_lock().

Ha! that would certainly help here. But it would mean that argh64v8 also
needs to define that, even though that is already RCsc.
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