27     pub action: Option<unsafe extern "C" fn(data: *mut ::core::ffi::c_void)>, //软中断处理函数  field
34             action: None,  in default()
83     action: Option<unsafe extern "C" fn(data: *mut ::core::ffi::c_void)>,  in register_softirq()
87     softirq_handler.register_softirq(irq_num, action, data);  in register_softirq()
191         action: Option<unsafe extern "C" fn(data: *mut ::core::ffi::c_void)>,  in register_softirq()
194         if self.table[irq_num as usize].action.is_some() {  in register_softirq()
198         if unsafe { verify_area(action.unwrap() as u64, 1) } {  in register_softirq()
202         self.table[irq_num as usize].action = action;  in register_softirq()
229         self.table[irq_num as usize].action = None;  in unregister_softirq()
241                 && self.table[softirq_index as usize].action.is_some()  in do_softirq()
246                         || self.table[softirq_index as usize].action.is_none()  in do_softirq()
255                         (self.table[softirq_index as usize].action.unwrap())(  in do_softirq()