default or selected kernelversion does not have config value CONFIG_RTC_MC146818_LIB.
Result is shown for kernelversion 6.9-rc1
CONFIG_RTC_MC146818_LIB (not configurable)
modulename: rtc-mc146818-lib.ko
configname: CONFIG_RTC_MC146818_LIB
Linux Kernel Configuration
└─>Device Drivers
└─>RTC_MC146818_LIB