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

[KOSAKI Motohiro]

On Thu, May 24, 2012 at 8:28 AM, Paul Mundt <lethal at 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.