Hi "Andrew-sh.Cheng", Thank you for the patch! Yet something to improve: [auto build test ERROR on pm/linux-next] [also build test ERROR on robh/for-next linus/master v5.7-rc6 next-20200519] [if your patch is applied to the wrong git tree, please drop us a note to help improve the system. BTW, we also suggest to use '--base' option to specify the base tree in git format-patch, please see https://stackoverflow.com/a/37406982] url: https://github.com/0day-ci/linux/commits/Andrew-sh-Cheng/Add-cpufreq-and-... base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next config: x86_64-rhel (attached as .config) compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0 reproduce: # save the attached .config to linux build tree make ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All error/warnings (new ones prefixed by >>, old ones prefixed by <<): ld: drivers/opp/cpu.o: in function `_of_lazy_link_required_tables': ld: drivers/opp/debugfs.o: in function `_of_lazy_link_required_tables': -- In file included from drivers/opp/core.c:22:0: bool _of_lazy_link_required_tables(struct opp_table *src) ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~ vim +232 drivers/opp/opp.h 219 220 #ifdef CONFIG_OF 221 void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index); 222 void _of_clear_opp_table(struct opp_table *opp_table); 223 struct opp_table *_managed_opp(struct device *dev, int index); 224 bool _of_lazy_link_required_tables(struct opp_table *src); 225 void _of_opp_free_required_opps(struct opp_table *opp_table, 226 struct dev_pm_opp *opp); 227 #else 228 static inline void _of_init_opp_table(struct opp_table *opp_table, struct device *dev, int index) {} 229 static inline void _of_clear_opp_table(struct opp_table *opp_table) {} 230 static inline struct opp_table *_managed_opp(struct device *dev, int index) { return NULL; } 233 return true; 234 } 235 static inline void _of_opp_free_required_opps(struct opp_table *opp_table, 236 struct dev_pm_opp *opp) {} 237 #endif 238 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org