tag	line	file	source code
RTC_DAY_OF_MONTH	108	arch/alpha/kernel/time.c	day = CMOS_READ(RTC_DAY_OF_MONTH);
RTC_DAY_OF_MONTH	338	arch/i386/kernel/time.c	day = CMOS_READ(RTC_DAY_OF_MONTH);
RTC_DAY_OF_MONTH	263	arch/mips/kernel/time.c	day = CMOS_READ(RTC_DAY_OF_MONTH);