linux-kernel - Re: [PATCHv2 3/4] mm: vmalloc: add VM_DMA flag to indicate areas used by dma-mapping framework

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Message-ID: <CAHGf_=qmBMFfV=UhXFtepO8styaQonfBA0E0+FO0qSi7RLfJFA@mail.gmail.com>
Date:	Sun, 27 May 2012 08:35:23 -0400
From:	KOSAKI Motohiro <kosaki.motohiro@...il.com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	Minchan Kim <minchan@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Arnd Bergmann <arnd@...db.de>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	Krishna Reddy <vdumpa@...dia.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Hiroshi Doyu <hdoyu@...dia.com>,
	Subash Patel <subashrp@...il.com>,
	Nick Piggin <npiggin@...il.com>
Subject: Re: [PATCHv2 3/4] mm: vmalloc: add VM_DMA flag to indicate areas used
 by dma-mapping framework

On Thu, May 24, 2012 at 8:28 AM, Paul Mundt <lethal@...ux-sh.org> wrote:
> On Thu, May 24, 2012 at 02:26:12PM +0200, Marek Szyprowski wrote:
>> On Tuesday, May 22, 2012 9:08 AM Minchan Kim wrote:
>> > Hmm, VM_DMA would become generic flag?
>> > AFAIU, maybe VM_DMA would be used only on ARM arch.
>>
>> Right now yes, it will be used only on ARM architecture, but maybe other architecture will
>> start using it once it is available.
>>
> There's very little about the code in question that is ARM-specific to
> begin with. I plan to adopt similar changes on SH once the work has
> settled one way or the other, so we'll probably use the VMA flag there,
> too.

I don't think VM_DMA is good idea because x86_64 has two dma zones. x86 unaware
patches make no sense.
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