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/?id=e56035f87752d8663188ca8507099f6c7172f053
        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@intel.com>

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'
>> ld: tegra30-devfreq.c:(.text+0x1489): undefined reference to `tegra_sku_info'

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0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org