linux-kernel - Re: [PATCHv8 00/12] Contiguous Memory Allocator

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Message-ID: <20101223100642.GD3636@n2100.arm.linux.org.uk>
Date:	Thu, 23 Dec 2010 10:06:42 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Kyungmin Park <kmpark@...radead.org>
Cc:	Michal Nazarewicz <m.nazarewicz@...sung.com>,
	linux-arm-kernel@...ts.infradead.org,
	Daniel Walker <dwalker@...eaurora.org>,
	Johan MOSSBERG <johan.xx.mossberg@...ricsson.com>,
	Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org,
	Michal Nazarewicz <mina86@...a86.com>, linux-mm@...ck.org,
	Ankita Garg <ankita@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-media@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>
Subject: Re: [PATCHv8 00/12] Contiguous Memory Allocator

On Thu, Dec 23, 2010 at 06:30:57PM +0900, Kyungmin Park wrote:
> Hi Andrew,
> 
> any comments? what's the next step to merge it for 2.6.38 kernel. we
> want to use this feature at mainline kernel.

Has anyone addressed my issue with it that this is wide-open for
abuse by allocating large chunks of memory, and then remapping
them in some way with different attributes, thereby violating the
ARM architecture specification?

In other words, do we _actually_ have a use for this which doesn't
involve doing something like allocating 32MB of memory from it,
remapping it so that it's DMA coherent, and then performing DMA
on the resulting buffer?
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