Selftests powerpc/primitives test hangs (linux-next)

[Sachin Sant]

While running powerpc/primitives selftests, the test (load_unaligned_zeropad)
hangs indefinitely. This behaviour is seen with linux-next 6.2.0-next-20230303
on a Power10 logical partition.

Git bisect points to following commit

commit 169db3bb460903443e25ac9c0737da45d6bb5402
   powerc/mm: try VMA lock-based page fault handling first

- Sachin