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xtensa: nommu: select HAVE_FUTEX_CMPXCHG
Not having HAVE_FUTEX_CMPXCHG makes futex_detect_cmpxchg probe cmpxchg_futex_value_locked with NULL address. It's not guaranteed to fault without MMU, instead it locks up on Xtensa when there's no RAM at address 0. Select HAVE_FUTEX_CMPXCHG in noMMU Xtensa configurations. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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