I have a really hard time reading following the patch.
Can you split folding__iommu_dma_map_swiotlb into iommu_dma_map_page
into a second cleanup patch?
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From: David Stevens
When calling arch_sync_dma, we need to pass it the memory that's
actually being used for dma. When using swiotlb bounce buffers, this is
the bounce buffer. Fold __iommu_dma_map_swiotlb into iommu_dma_map_page
so it can sync the right phys_addr_t.
Now that iommu_dma_map_sg
