On Tue, Jan 10, 2017 at 03:47:25PM +0300, Nikita Yushchenko wrote: > With this direction, semantics of dma mask becomes even more > questionable. I'd say dma_mask is candidate for removal (or to move to > swiotlb's or iommu's local area) We need the dma mask so that the device can advertise what addresses the device supports. Many old devices only support 32-bit DMA addressing, and some less common ones just 24-bit or other weird ones.
