[PATCH 3/4] mm: simplify device private page handling in hmm_range_fault

[Christoph Hellwig]

On Mon, Mar 16, 2020 at 04:59:23PM -0300, Jason Gunthorpe wrote:
> However, between patch 3 and 4 doesn't this break amd gpu as it will
> return device_private pages now if not requested? Squash the two?

No change in behavior in this patch as long as HMM_PFN_DEVICE_PRIVATE
isn't set in ->pfns or ->default_flags, which is the case for both
nouveau and amdgpu.  The existing behavior is broken for private
pages not known to the driver, but that is fixed in the next patch.