#ifdef CONFIG_RTC_INTF_DEV extern void __init rtc_dev_init(void);extern void __exit rtc_dev_exit(void);extern void rtc_dev_prepare(struct rtc_device *rtc); #else static inline void rtc_dev_init(void){} static inline void rtc_dev_exit(void){} static inline void rtc_dev_prepare(struct rtc_device *rtc){} #endif #ifdef CONFIG_RTC_INTF_PROC extern void rtc_proc_add_device(struct rtc_device *rtc);extern void rtc_proc_del_device(struct rtc_device *rtc); #else static inline void rtc_proc_add_device(struct rtc_device *rtc){} static inline void rtc_proc_del_device(struct rtc_device *rtc){} #endif #ifdef CONFIG_RTC_INTF_SYSFSconst struct attribute_group **rtc_get_dev_attribute_groups(void);#elsestatic inline const struct attribute_group **rtc_get_dev_attribute_groups(void){	return NULL;}#endif #ifdef CONFIG_RTC_NVMEMvoid rtc_nvmem_register(struct rtc_device *rtc);void rtc_nvmem_unregister(struct rtc_device *rtc);#elsestatic inline void rtc_nvmem_register(struct rtc_device *rtc) {}static inline void rtc_nvmem_unregister(struct rtc_device *rtc) {}#endif