userfaultfd: hugetlbfs: userfaultfd_huge_must_wait for hugepmd ranges
Add routine userfaultfd_huge_must_wait which has the same functionality as the existing userfaultfd_must_wait routine. Only difference is that new routine must handle page table structure for hugepmd vmas. Link: http://lkml.kernel.org/r/20161216144821.5183-24-aarcange@redhat.comSigned-off-by: Mike Kravetz <mike.kravetz@oracle.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com> Cc: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: Michael Rapoport <RAPOPORT@il.ibm.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Cc: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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