Re: [PATCH 1/2] MIPS: Define pgprot_dmacoherent according to coherentio status

[Jiaxun Yang]

ä 2020å1æ13æ GMT+08:00 äå10:58:20, Christoph Hellwig <hch@xxxxxx> åå:
>On Mon, Jan 13, 2020 at 10:07:04PM +0800, Jiaxun Yang wrote:
>> For MIPS chips that support coherentio DMA, it's always safe
>> to make DMA requests cached.
>
>For DMA coherent devices pgprot_dmacoherent isn't even used, so this
>doesn't make sense.

Hi,

I'm supposed to use it later in drm/ttm
 ttm_bo_util to overwrite pgprot for TTM_PL_SYSTEM.
And I wish this pgropt can always represent dmacoherent pgropt.
Would it be fine?

Thanks

-- 
Jiaxun Yang