static void __locks_insert_block(struct file_lock *blocker_fl,
				 struct file_lock *waiter_fl,
				 bool conflict(struct file_lock_core *,
					       struct file_lock_core *))
static void __locks_insert_block(struct file_lock_core *blocker,
				 struct file_lock_core *waiter,
				 bool conflict(struct file_lock_core *,
					       struct file_lock_core *))