PVR_MMU_BACKING_PAGE_SIZE
static_assert(PAGE_SIZE >= PVR_MMU_BACKING_PAGE_SIZE);
dma_addr = dma_map_page(dev, raw_page, 0, PVR_MMU_BACKING_PAGE_SIZE,
dma_unmap_page(dev, page->dma_addr, PVR_MMU_BACKING_PAGE_SIZE,
PVR_MMU_BACKING_PAGE_SIZE, DMA_TO_DEVICE);
static_assert(sizeof(struct pvr_page_table_l2_raw) == PVR_MMU_BACKING_PAGE_SIZE);
static_assert(sizeof(struct pvr_page_table_l1_raw) == PVR_MMU_BACKING_PAGE_SIZE);
static_assert(sizeof(struct pvr_page_table_l0_raw) <= PVR_MMU_BACKING_PAGE_SIZE);