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userfaultfd_open() returns 1 for errors rather than negatives. Fix it on all the callers so when UFFDIO_API failed the test will bail out. Link: https://lkml.kernel.org/r/20201208024709.7701-3-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Mike Rapoport <rppt@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>