rpc_queue_upcall
rc = rpc_queue_upcall(nn->bl_device_pipe, msg);
ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
ret = rpc_queue_upcall(pipe, &msg);
extern int rpc_queue_upcall(struct rpc_pipe *, struct rpc_pipe_msg *);
res = rpc_queue_upcall(gss_new->pipe, &gss_new->msg);
EXPORT_SYMBOL_GPL(rpc_queue_upcall);