On Thu, Dec 20, 2018 at 02:32:52PM +0000, Eugeniy Paltsev wrote: > Hi Christoph, > > I test kernel from your 'dma-alloc-always-zero' branch, and as > I can see we have DMA peripherals (like USB) broken. I would be really surprised if that is caused by the patch to add the zeroing. Can you check which commit caused the issue by bisecting from a known good baseline?