Hi everyone, I though I got rid of all non-highmem, non-ISA block layer bounce buffering a while ago, but I missed the MMC case. While I still plan to also kill off the highmem bouncing there I won't get to it this merge window, so for now I'd like to make some progress and move MMC to the DMA layer (swiotlb or arm dmabounce) bouncing for addressing limitations and kill off the dma_max_pfn helper.
