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acpi_bus_generate_netlink_event 这个函数会根据形参来组建一个netlink的message，并发送这个message到user space其源码分析如下：int acpi_bus_generate_netlink_event(const char *device_class,				      const char *bus_id,				      u8 type, int data){	struct sk_buff *skb;	struct nlattr *attr;	struct acpi_genl_event *event;	void *msg_header;	int size;	/* allocate memory */	#申请一个用于保存message的内存空间	size = nla_total_size(sizeof(struct acpi_genl_event)) +	    nla_total_size(0);	#用申请到的内存生成一个sk_buff	skb = genlmsg_new(size, GFP_ATOMIC);	if (!skb)		return -ENOMEM;	/* add the genetlink message header */	#给sk_buff 天剑header	msg_header = genlmsg_put(skb, 0, acpi_event_seqnum++,				 &acpi_event_genl_family, 0,				 ACPI_GENL_CMD_EVENT);	if (!msg_header) {		nlmsg_free(skb);		return -ENOMEM;	}	/* fill the data */	attr =	    nla_reserve(skb, ACPI_GENL_ATTR_EVENT,			sizeof(struct acpi_genl_event));	if (!attr) {		nlmsg_free(skb);		return -EINVAL;	}	#给要发送的event赋值	event = nla_data(attr);	memset(event, 0, sizeof(struct acpi_genl_event));	strcpy(event->device_class, device_class);	strcpy(event->bus_id, bus_id);	event->type = type;	event->data = data;	#标志skb结束	/* send multicast genetlink message */	genlmsg_end(skb, msg_header);	#发送event	genlmsg_multicast(&acpi_event_genl_family, skb, 0, 0, GFP_ATOMIC);	return 0;}

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