[tip:timers/core 6/6] alarmtimer.c:undefined reference to `rtc_ktime_to_tm'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
head:   a0a6e06d545a753740c9d8d5ce2c4fdd3ab1c021
commit: a0a6e06d545a753740c9d8d5ce2c4fdd3ab1c021 [6/6] time: alarmtimer: Add tracepoints for alarmtimers
config: s390-allyesconfig (attached as .config)
compiler: s390x-linux-gnu-gcc (Debian 5.4.0-6) 5.4.0 20160609
reproduce:
        wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout a0a6e06d545a753740c9d8d5ce2c4fdd3ab1c021
        # save the attached .config to linux build tree
        make.cross ARCH=s390 

All errors (new ones prefixed by >>):

   kernel/built-in.o: In function `perf_trace_alarm_processing':
>> alarmtimer.c:(.text+0xcc918): undefined reference to `rtc_ktime_to_tm'
   alarmtimer.c:(.text+0xcc92e): undefined reference to `rtc_ktime_to_tm'
   alarmtimer.c:(.text+0xcc944): undefined reference to `rtc_ktime_to_tm'
   alarmtimer.c:(.text+0xcc95a): undefined reference to `rtc_ktime_to_tm'
   alarmtimer.c:(.text+0xcc970): undefined reference to `rtc_ktime_to_tm'
   kernel/built-in.o:alarmtimer.c:(.text+0xcc986): more undefined references to `rtc_ktime_to_tm' follow

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