[PATCH 04/15] mm: remove the pgmap field from struct hmm_vma_walk

[Jason Gunthorpe]

On Thu, Aug 15, 2019 at 04:51:33PM -0400, Jerome Glisse wrote:

> struct page. In this case any way we can update the
> nouveau_dmem_page() to check that page page->pgmap == the
> expected pgmap.

I was also wondering if that is a problem.. just blindly doing a
container_of on the page->pgmap does seem like it assumes that only
this driver is using DEVICE_PRIVATE.

It seems like something missing in hmm_range_fault, it should be told
what DEVICE_PRIVATE is acceptable to trigger HMM_PFN_DEVICE_PRIVATE
and fault all others?

Jason