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.
