On Wed, Feb 16, 2022 at 11:56:51AM -0500, Felix Kuehling wrote: > In the case of DEVICE_COHERENT memory, the pfns correspond to real physical > memory addresses. I don't think they have those PFN_DEV|PFN_MAP bits set. So do DAX pages. The PTE flag does several things. As this would be the first time ZONE_DEVICE pages do not set devmap it needs a full audit. eg the gup_fast bug Alistair pointed at needs fixing at least. Jason
