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

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Message-ID: <20151112180203.GF17308@twins.programming.kicks-ass.net>
Date:	Thu, 12 Nov 2015 19:02:03 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Boqun Feng <boqun.feng@...il.com>, mingo@...nel.org,
	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	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 07:38:07PM +0100, Oleg Nesterov wrote:
> It seems that PPC needs to define smp_mb__before_spinlock() as full mb(),
> no?

It does:

arch/powerpc/include/asm/barrier.h:#define smp_mb__before_spinlock() smp_mb()

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