dax: revert userfaultfd change
Undo the change which "userfaultfd: call handle_userfault() for userfaultfd_missing() faults" made to set_huge_zero_page(). DAX will need that return value. Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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