futex_lock_pi_atomic
extern int futex_lock_pi_atomic(u32 __user *uaddr, struct futex_hash_bucket *hb,
ret = futex_lock_pi_atomic(uaddr, hb, &q.key, &q.pi_state, current,
ret = futex_lock_pi_atomic(pifutex, hb2, key2, ps, top_waiter->task,