drivers/rtc/rtc-m41t80.c:216:12: warning: ‘m41t80_rtc_alarm_irq_enable’ defined but not used [-Wunused-function]
error, forbidden warning: rtc-m41t80.c:216
scripts/Makefile.build:313: recipe for target 'drivers/rtc/rtc-m41t80.o' failed
make[2]: *** [drivers/rtc/rtc-m41t80.o] Error 1
scripts/Makefile.build:443: recipe for target 'drivers/rtc' failed
make[1]: *** [drivers/rtc] Error 2
Makefile:951: recipe for target 'drivers' failed
make: *** [drivers] Error 2