On Tue, Feb 22, 2022 at 09:42:22PM +0800, Baoquan He wrote: > In the old dma mapping, coherent mapping uses dma_alloc_coherent() to > allocate DMA buffer and mapping; while streaming mapping can only get > memory from slab or buddy allocator, then map with dma_map_single(). > In that situation, dma_alloc_direct() checks a direct mapping for > coherent DMA, dma_map_direct() checks a direct mapping for streaming > DMA. > > However, several new APIs have been added for streaming mapping, e.g > dma_alloc_pages(). These new APIs take care of DMA buffer allocating > and mapping which are similar with dma_alloc_coherent(). So we should > rename both of them to reflect their real intention to avoid confusion. > > dma_alloc_direct() ==> dma_coherent_direct() > dma_map_direct() ==> dma_streaming_direct() No, these new names are highly misleading.
