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

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Message-ID: <20200113145820.GA9817@lst.de>
Date:   Mon, 13 Jan 2020 15:58:20 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
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

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.