The patch 2 in this patchset adding tracepoints for alarmtimers will build
failed on S390 platform, due to S390 defconfig did not define CONFIG_RTC_LIB
macro to define the rtc_ktime_to_tm() function which is used in this patch.
Thus we should add some ummy static inline functions in case CONFIG_RTC
For system debugging, we sometimes want to know who sets one
alarm timer, the time of the timer, when the timer started and
fired and so on. Thus adding tracepoints can help us trace the
alarmtimer information.
For example, when we debug the system supend/resume, if the
system is always resumed by
