Merge tag 'x86_mm_for_7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip

Pull x86 mm updates from Dave Hansen:
 "There's a small comment fixup, followed by an actual bug fix. The bug
  fix is slightly new territory for us. It fixes a real regression, but
  it is from ~6.18 not a _new_ regression. It was mostly only biting
  folks doing hotplug memory testing. So, it was queued in here and held
  for the merge window instead of going via x86/urgent.

   - Fix freeing of PMD-sized vmemmap pages

   - Update comment about pgd_list"

* tag 'x86_mm_for_7.2-rc1' of gitolite.kernel.org:pub/scm/linux/kernel/git/tip/tip:
  x86/mm: Fix freeing of PMD-sized vmemmap pages
  x86: Update comment about pgd_list