RPC_TASK_MSG_PIN_WAIT
{ (1UL << RPC_TASK_MSG_PIN_WAIT), "MSG_PIN_WAIT" })
if (!test_bit(RPC_TASK_MSG_PIN_WAIT, &req->rq_task->tk_runstate)) {
set_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate);
clear_bit(RPC_TASK_MSG_PIN_WAIT, &task->tk_runstate);