Subject: cleanup the dma_pgprot handling

From: Christoph Hellwig <[email-masked]>
Date: Fri, 16 Aug 2019 09:07:48 +0200

Hi all,

this series replaced the arch_dma_mmap_pgprot hooks with the
simpler pgprot_dmacoherent as used by the arm code already and
cleans up various bits around that area.

I'd still like to hear a confirmation from the mips folks how
the write combibe attribute can or can't work with the KSEG1
uncached segment.

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