linux-kernel - Re: slub: use irqsafe_cpu_cmpxchg for put_cpu

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Date:	Wed, 23 Nov 2011 15:15:57 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Pekka Enberg <penberg@...nel.org>,
	Christian Kujau <lists@...dbynature.de>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	"Alex,Shi" <alex.shi@...el.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, Matt Mackall <mpm@...enic.com>,
	netdev@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: Re: slub: use irqsafe_cpu_cmpxchg for put_cpu_partial

On Wed, 23 Nov 2011, Christoph Lameter wrote:

> Subject: slub: use irqsafe_cpu_cmpxchg for put_cpu_partial
> 
> The cmpxchg must be irq safe. The fallback for this_cpu_cmpxchg only
> disables preemption which results in per cpu partial page operation
> potentially failing on non x86 platforms.
> 
> Signed-off-by: Christoph Lameter <cl@...ux.com>

Acked-by: David Rientjes <rientjes@...gle.com>
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