mm-uffd-uffd_feature_wp_unpopulated-fix

mm-uffd-uffd_feature_wp_unpopulated-fix

Two comment changes suggested by David, and also a oneliner fix to
khugepaged (to bail out anon thp collapsing when seeing pte markers).

Link: https://lkml.kernel.org/r/ZB2/8jPhD3fpx5U8@x1n
Signed-off-by: Peter Xu <peterx@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: Muhammad Usama Anjum <usama.anjum@collabora.com>
Cc: Nadav Amit <nadav.amit@gmail.com>
Cc: Paul Gofman <pgofman@codeweavers.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>