I ' ve assumed here that elsewhere in your driver is a manifest constant named mydevice _ alignment that equals a power of 2 and represents the required alignment of your device ' s data buffers 在这里我假设:在你的驱动的别的地方是一个明显的叫做mydevice _ alignment的常量,它等价于2并且象征你的设备的数据缓冲器请求的队列。