linux-kernel - Re: [PATCH] memcg: remove unneeded preempt

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Message-ID: <1314298425.27911.89.camel@twins>
Date:	Thu, 25 Aug 2011 20:53:45 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	James Bottomley <James.bottomley@...senPartnership.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <bsingharora@...il.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] memcg: remove unneeded preempt_disable

On Thu, 2011-08-25 at 20:49 +0200, Peter Zijlstra wrote:
> the ARM LL/SC constraints pretty much mandate we do
> preempt_disable()/preempt_enable() around them, 

My bad, that was MIPS, it states that portable programs should not issue
load/store/prefetch insn inside a LL/SC region or the behaviour is
undefined or somesuch.
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