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See http://www.infradead.org/rpr.html On Thu, Mar 28, 2024 at 04:23:22PM +0900, Damien Le Moal wrote: > But I thought that the original issue was that some arch have ARCH_DMA_MINALIGN > down to 8B but hisi driver needs at least 16 ? > > So in the end, you need something like: > > size = ALIGN(size, max(16, ARCH_DMA_MINALIGN)); > > no ? I don't think we ever have an 8 byte dma minalign. With 8-byte aligned addresses dma_mapping_error could run into problems.