linux-kernel - Re: iwlagn: order 2 page allocation failures

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Message-ID: <alpine.DEB.1.10.0909141403390.5676@V090114053VZO-1>
Date:	Mon, 14 Sep 2009 14:04:11 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Mel Gorman <mel@....ul.ie>
cc:	Zhu Yi <yi.zhu@...el.com>,
	"Chatre, Reinette" <reinette.chatre@...el.com>,
	Frans Pop <elendil@...net.nl>,
	Larry Finger <Larry.Finger@...inger.net>,
	"John W. Linville" <linville@...driver.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"ipw3945-devel@...ts.sourceforge.net" 
	<ipw3945-devel@...ts.sourceforge.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Krauss, Assaf" <assaf.krauss@...el.com>,
	Johannes Berg <johannes@...solutions.net>,
	"Abbas, Mohamed" <mohamed.abbas@...el.com>
Subject: Re: iwlagn: order 2 page allocation failures

On Mon, 14 Sep 2009, Mel Gorman wrote:

> The allocation of buffers >= PAGE_SIZE even when allocated with
> kmalloc() are page-aligned though right? It's not an explicit guarantee
> but is it not always the case?

Its typically the case but debug options may misalign the object. The
guarantee for kmalloc caches is to be cacheline aligned.

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