On Tue, Jun 09, 2020 at 05:25:04PM +0100, Vladimir Murzin wrote: > Even though commit mentions ARM, I do not see how mmap would continue > to work for NOMMU with dma-direct. ARM NOMMU needs it's own DMA operations > only in cases where caches are implemented or active, in other cases it > fully relies on dma-direct. > It looks to me that we either should provide NOMMU variant for mmap in > dma/direct or (carefully) fix dma/mapping. I think dma-direct is the right place, the common helpers in dma/mapping.c are basically the red headed stepchilds for misc IOMMU drivers not covered by dma-iommu only.
