Re: remove default fallbacks in dma_map_ops v3

I've applied this to the dma-mapping for-next tree now. If there are any issues with the parisc patch I'll happily take incremental patches.

remove default fallbacks in dma_map_ops v3

Hi all, we have a few places where the DMA mapping layer has non-trivial default actions that are questionable and/or dangerous. This series instead wires up the mmap, get_sgtable and get_required_mask methods explicitly and cleans up some surrounding areas. This also means we could get rid of t