16 Feb
2022
16 Feb
'22
5:28 p.m.
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