get_lock_parent_ip
unsigned long ip = get_lock_parent_ip();
trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());
current->preempt_disable_ip = get_lock_parent_ip();
trace_preempt_off(CALLER_ADDR0, get_lock_parent_ip());
trace_preempt_on(CALLER_ADDR0, get_lock_parent_ip());