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If __NR_userfaultfd is not yet defined by the arch, warn but still build and run the userfaultfd selftest successfully. Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Cc: Dr. David Alan Gilbert <dgilbert@redhat.com> Cc: Shuah Khan <shuahkh@osg.samsung.com> Cc: Thierry Reding <treding@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>