Messages in this thread | | | Date | Thu, 17 Jun 2021 10:52:33 +0200 | From | Christoph Hellwig <> | Subject | Re: [PATCHv2 8/8] videobuf2: handle non-contiguous DMA allocations |
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On Thu, Jun 17, 2021 at 05:30:11PM +0900, Tomasz Figa wrote: > We still have use cases for dma_alloc_coherent() and DMA_ATTR_NO_KERNEL_MAPPING.
dma_alloc_coherent does not take a flags argument, so you can't use DMA_ATTR_NO_KERNEL_MAPPING with it. What would your use case be here anyway? In general DMA_ATTR_NO_KERNEL_MAPPING is rather misnamed, as usually there is a kernel mapping, just not one that is coherent and should be used.
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