• Christoph Hellwig's avatar
    dma-mapping: remove arch_dma_mmap_pgprot · 419e2f18
    Christoph Hellwig authored
    arch_dma_mmap_pgprot is used for two things:
    
     1) to override the "normal" uncached page attributes for mapping
        memory coherent to devices that can't snoop the CPU caches
     2) to provide the special DMA_ATTR_WRITE_COMBINE semantics on older
        arm systems and some mips platforms
    
    Replace one with the pgprot_dmacoherent macro that is already provided
    by arm and much simpler to use, and lift the DMA_ATTR_WRITE_COMBINE
    handling to common code with an explicit arch opt-in.
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>	# m68k
    Acked-by: Paul Burton <paul.burton@mips.com>		# mips
    419e2f18
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