selftests/mm: UFFDIO_API test
Add one simple test for UFFDIO_API. With that, I also added a bunch of small but handy helpers along the way. Link: https://lkml.kernel.org/r/20230412164257.328375-1-peterx@redhat.com Signed-off-by: Peter Xu <peterx@redhat.com> Cc: Axel Rasmussen <axelrasmussen@google.com> Cc: David Hildenbrand <david@redhat.com> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Mike Rapoport (IBM) <rppt@kernel.org> Cc: Zach O'Keefe <zokeefe@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
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