On Wed, Apr 25, 2018 at 07:15:37AM +0200, Christoph Hellwig wrote: > Only mips and unicore32 select CONFIG_NEED_SG_DMA_LENGTH when building > swiotlb. swiotlb itself never merges segements and doesn't accesses the > dma_length field directly, so drop the dependency. Is that at odds with Documentation/DMA-API-HOWTO.txt, which seems to suggest arch ports should enable it for IOMMUs? Cheers James
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