linux-kernel - Re: [PATCH 0/2] x86: per-device dma_mapping

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Date:	Fri, 16 May 2008 12:44:53 +0900
From:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
To:	andi@...stfloor.org
Cc:	fujita.tomonori@....ntt.co.jp, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, muli@...ibm.com, alexisb@...ibm.com
Subject: Re: [PATCH 0/2] x86: per-device dma_mapping_ops

On Thu, 15 May 2008 12:48:04 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> 
> > I thought that KVM people want to do it per device (in the first
> > case). So with my patchse, they can replace the dma_ops pointer in
> > dev_archdata with what they want.
> 
> But where would they save the original pointer?

Yeah, we need an extra mechanism for that but it's same for the
system-wide dma_ops pointer (i.e. without my patches), isn't it?

I'm still not sure how this patchset make it impossible to have stack
dma_ops. These people need per-device dma_ops and we can do stack
per-device dma_ops?
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