linux-kernel - Re: [Linaro-mm-sig] [PATCH 6/8] drivers: add Contiguous Memory Allocator

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Message-ID: <alpine.LFD.2.00.1107061034200.14596@xanadu.home>
Date:	Wed, 6 Jul 2011 10:37:37 -0400 (EDT)
From:	Nicolas Pitre <nicolas.pitre@...aro.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
cc:	Arnd Bergmann <arnd@...db.de>,
	'Daniel Walker' <dwalker@...eaurora.org>,
	'Jonathan Corbet' <corbet@....net>,
	'Mel Gorman' <mel@....ul.ie>,
	'Chunsang Jeong' <chunsang.jeong@...aro.org>,
	'Jesse Barker' <jesse.barker@...aro.org>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	'Michal Nazarewicz' <mina86@...a86.com>,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Ankita Garg' <ankita@...ibm.com>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [Linaro-mm-sig] [PATCH 6/8] drivers: add Contiguous Memory
 Allocator

On Wed, 6 Jul 2011, Russell King - ARM Linux wrote:

> Another issue is that when a platform has restricted DMA regions,
> they typically don't fall into the highmem zone.  As the dmabounce
> code allocates from the DMA coherent allocator to provide it with
> guaranteed DMA-able memory, that would be rather inconvenient.

Do we encounter this in practice i.e. do those platforms requiring large 
contiguous allocations motivating this work have such DMA restrictions?


Nicolas
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