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From: KOSAKI Motohiro <kosaki.motohiro@gmail.com>
Date: Sun, 27 May 2012 08:35:23 -0400
Message-ID: <CAHGf_=qmBMFfV=UhXFtepO8styaQonfBA0E0+FO0qSi7RLfJFA@mail.gmail.com>
Subject: Re: [PATCHv2 3/4] mm: vmalloc: add VM_DMA flag to indicate areas used
 by dma-mapping framework
To: Paul Mundt <lethal@linux-sh.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
        Minchan Kim <minchan@kernel.org>, linux-arm-kernel@lists.infradead.org,
        linaro-mm-sig@lists.linaro.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org,
        Kyungmin Park <kyungmin.park@samsung.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Russell King - ARM Linux <linux@arm.linux.org.uk>,
        Chunsang Jeong <chunsang.jeong@linaro.org>,
        Krishna Reddy <vdumpa@nvidia.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Hiroshi Doyu <hdoyu@nvidia.com>, Subash Patel <subashrp@gmail.com>,
        Nick Piggin <npiggin@gmail.com>
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On Thu, May 24, 2012 at 8:28 AM, Paul Mundt <lethal@linux-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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