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Date: Tue, 23 Mar 2004 02:05:37 -0800
From: William Lee Irwin III <wli@holomorphy.com>
Subject: Re: can device drivers return non-ram via vm_ops->nopage?
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To: rmk@arm.linux.org.uk, David Woodhouse <dwmw2@infradead.org>, Benjamin Herrenschmidt <benh@kernel.crashing.org>, Jeff Garzik <jgarzik@pobox.com>, James Bottomley <James.Bottomley@steeleye.com>, Linux Arch list <linux-arch@vger.kernel.org>, Linus Torvalds <torvalds@osdl.org>, Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@osdl.org>, Andrea Arcangeli <andrea@suse.de>
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On Tue, Mar 23, 2004 at 09:34:52AM +0000, David Woodhouse wrote:
>> Populating PTEs on demand through nopage() can be an implementation
>> detail. You don't have to make 'struct page' available in the generic
>> API to achieve that optimisation.

On Tue, Mar 23, 2004 at 10:04:29AM +0000, Russell King wrote:
> Indeed - and this is what my implementation of dma_coherent_mmap() does
> on ARM.
> Once everyone has decided on a solution, we can then move it forward.
> Currently it does look like dma_coherent_mmap() is the one of choice,
> so... Are there any remaining objections to it?

I like dma_coherent_mmap().


-- wli