Hi Nick, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linux/master] [also build test WARNING on linus/master v5.16-rc5] [cannot apply to masahiroy/kconfig jeyu/modules-next next-20211217] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Nick-Alcock/kbuild-bring-back-tr... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 136057256686de39cc3a07c2e39ef6bc43003ff6 config: arm-randconfig-r032-20211216 (https://download.01.org/0day-ci/archive/20211218/202112180057.UZKXPkGe-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project dd245bab9fbb364faa1581e4f92ba3119a872fba) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # install arm cross compiling tool for clang build # apt-get install binutils-arm-linux-gnueabi # https://github.com/0day-ci/linux/commit/4487902c03d7f7e83c68807ab24d62c46... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Nick-Alcock/kbuild-bring-back-tristate-conf/20211217-051935 git checkout 4487902c03d7f7e83c68807ab24d62c467338795 # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): kernel/kallsyms.c:665:12: warning: no previous prototype for function 'arch_get_kallsym' [-Wmissing-prototypes] int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, ^ kernel/kallsyms.c:665:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, ^ static kernel/kallsyms.c:1074:30: warning: unused variable 'kallsyms_proc_ops' [-Wunused-const-variable] static const struct proc_ops kallsyms_proc_ops = { ^ static const struct proc_ops kallmodsyms_proc_ops = { ^ 3 warnings generated. vim +/kallmodsyms_proc_ops +1082 kernel/kallsyms.c 1080 1081 #ifdef CONFIG_KALLMODSYMS 1083 .proc_open = kallmodsyms_open, 1084 .proc_read = seq_read, 1085 .proc_lseek = seq_lseek, 1086 .proc_release = seq_release_private, 1087 }; 1088 #endif 1089 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org