tree: https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git devfreq-testing head: 24353caf6d50c7ddccd48435d34f79182c0b3923 commit: e56035f87752d8663188ca8507099f6c7172f053 [12/16] PM / devfreq: tegra30: Support interconnect and OPPs from device-tree config: x86_64-allyesconfig (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git/commit/... git remote add chanwoo https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/linux.git git fetch --no-tags chanwoo devfreq-testing git checkout e56035f87752d8663188ca8507099f6c7172f053 # save the attached .config to linux build tree make W=1 ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: drivers/devfreq/tegra30-devfreq.o: in function `tegra_devfreq_probe': tegra30-devfreq.c:(.text+0x147e): undefined reference to `tegra_sku_info' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org