Messages in this thread | | | Date | Tue, 9 Feb 2021 10:36:42 +0100 | From | Christoph Hellwig <> | Subject | Re: DMA direct mapping fix for 5.4 and earlier stable branches |
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On Tue, Feb 09, 2021 at 10:23:12AM +0100, Greg KH wrote: > > From the view point of ZeroCopy using DMABUF, is 5.4 not > > mature enough, and is 5.10 enough mature ? > > This is the most important point for judging migration. > > How do you judge "mature"? > > And again, if a feature isn't present in a specific kernel version, why > would you think that it would be a viable solution for you to use?
I'm pretty sure dma_get_sgtable has been around much longer and was supposed to work, but only really did work properly for arm32, and for platforms with coherent DMA. I bet he is using non-coherent arm64, and it would be broken for other drivers there as well if people did test them, which they apparently so far did not.
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