Re: [PATCH v5 2/7] dma: Add simple dma_noop_mmap

[Christoph Hellwig]

On Wed, May 24, 2017 at 11:24:27AM +0100, Vladimir Murzin wrote:
> This patch adds a simple implementation of mmap to dma_noop_ops.

Currently we use dma_common_mmap as the generic fallback if a dma_ops
instance doesn't implement a mmap method.  Can you just fix up
dma_common_mmap for your nommu case - it looks like yours is basically
a subset.

In fact I suspect yours should call dma_mmap_from_coherent as well,
so the only different is the lack of pgprot_noncached call.