Hi William, I love your patch! Perhaps something to improve: [auto build test WARNING on linus/master] [also build test WARNING on v5.7-rc6 next-20200519] [cannot apply to stm32/stm32-next linux/master] [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/William-Breathitt-Gray/Introduce-the-Counter-character-device-interface/20200517-032530 base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 12bf0b632ed090358cbf03e323e5342212d0b2e4 config: arm64-randconfig-r026-20200519 (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 135b877874fae96b4372c8a3fbfaa8ff44ff86e3) reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp@xxxxxxxxx> All warnings (new ones prefixed by >>, old ones prefixed by <<): >> drivers/counter/counter-sysfs.c:850:5: warning: no previous prototype for function 'counter_sysfs_add' [-Wmissing-prototypes] int counter_sysfs_add(struct counter_device *const counter) ^ drivers/counter/counter-sysfs.c:850:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int counter_sysfs_add(struct counter_device *const counter) ^ static >> drivers/counter/counter-sysfs.c:876:6: warning: no previous prototype for function 'counter_sysfs_free' [-Wmissing-prototypes] void counter_sysfs_free(struct counter_device *const counter) ^ drivers/counter/counter-sysfs.c:876:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void counter_sysfs_free(struct counter_device *const counter) ^ static 2 warnings generated. vim +/counter_sysfs_add +850 drivers/counter/counter-sysfs.c 849 > 850 int counter_sysfs_add(struct counter_device *const counter) 851 { 852 int err; 853 854 /* Initialize Synapse names list */ 855 INIT_LIST_HEAD(&counter->dynamic_names_list); 856 857 /* Prepare device attributes */ 858 err = counter_groups_list_prepare(counter); 859 if (err) 860 goto err_free_names; 861 862 /* Organize device attributes to groups and match to device */ 863 err = counter_groups_prepare(counter); 864 if (err) 865 goto err_free_groups_list; 866 867 return 0; 868 869 err_free_groups_list: 870 counter_groups_list_free(counter); 871 err_free_names: 872 counter_dynamic_names_free(&counter->dynamic_names_list); 873 return err; 874 } 875 > 876 void counter_sysfs_free(struct counter_device *const counter) --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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