Merge tag 'drm-vmwgfx-coherent-2019-11-29' of git://anongit.freedesktop.org/drm/drm

Pull drm coherent memory support for vmwgfx from Dave Airlie:
 "This is a separate pull for the mm pagewalking + drm/vmwgfx work
  Thomas did and you were involved in, I've left it separate in case you
  don't feel as comfortable with it as the other stuff.

  It has mm acks/r-b in the right places from what I can see"

* tag 'drm-vmwgfx-coherent-2019-11-29' of git://anongit.freedesktop.org/drm/drm:
  drm/vmwgfx: Add surface dirty-tracking callbacks
  drm/vmwgfx: Implement an infrastructure for read-coherent resources
  drm/vmwgfx: Use an RBtree instead of linked list for MOB resources
  drm/vmwgfx: Implement an infrastructure for write-coherent resources
  mm: Add write-protect and clean utilities for address space ranges
  mm: Add a walk_page_mapping() function to the pagewalk code
  mm: pagewalk: Take the pagetable lock in walk_pte_range()
  mm: Remove BUG_ON mmap_sem not held from xxx_trans_huge_lock()
  drm/ttm: Convert vm callbacks to helpers
  drm/ttm: Remove explicit typecasts of vm_private_data

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