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Add a helper to map memory allocated using dma_alloc_pages into a user address space, similar to the dma_alloc_attrs function for coherent allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Tomasz Figa <tfiga@chromium.org> Tested-by: Ricardo Ribalda <ribalda@chromium.org>