On Fri, Jul 22, 2022 at 10:45:54AM +0100, Tvrtko Ursulin wrote: >> - unsigned int size = swiotlb_max_segment(); >> - >> - if (size == 0) >> - size = UINT_MAX; > > On a more detailed look, there was a CI failure which makes me think this > cap might need to stay. Because max sg segment is unsigned int. So I wonder > if sg contstruction overflows without it. > > If this quick analysis is right, you could leave i915_sg_segment_size > helper and cap the return from dma_max_mapping_size to UINT_MAX in it.
As dma_max_mapping_size retuns a size_t it would be good to make all variables using it a size_t as well. In places where that gets lower to an unsigned int your probably want this cap.
