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

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Message-ID: <6A037EB9-B5FE-462F-A6EA-8FD874432E75@flygoat.com>
Date:   Mon, 13 Jan 2020 23:11:58 +0800
From:   Jiaxun Yang <jiaxun.yang@...goat.com>
To:     Christoph Hellwig <hch@....de>
CC:     linux-mips@...r.kernel.org, chenhc@...ote.com,
        paul.burton@...s.com, linux-kernel@...r.kernel.org, hch@....de
Subject: Re: [PATCH 1/2] MIPS: Define pgprot_dmacoherent according to coherentio status



于 2020年1月13日 GMT+08:00 下午10:58:20, Christoph Hellwig <hch@....de> 写到:
>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