tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
head:   f379d4b265627033aa2f4d68464df7ae3a6a11c9
commit: a1823cba722b8f403f6ad83ec79b17773817fb27 [5/6] x86 / CPU: Always show current CPU frequency in /proc/cpuinfo
config: i386-alldefconfig (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout a1823cba722b8f403f6ad83ec79b17773817fb27
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/proc.o: In function `show_cpuinfo':

quoted

proc.c:(.text+0x354): undefined reference to `aperfmperf_get_khz'

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation