Hi Alan, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Alan-Maguire/bpf-printk-add-BTF-... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-allyesconfig (attached as .config) compiler: clang version 11.0.0 (https://github.com/llvm/llvm-project 1d4c87335d5236ea1f35937e1014980ba961ae34) 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 x86_64 cross compiling tool for clang build # apt-get install binutils-x86-64-linux-gnu # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross 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 warnings (new ones prefixed by >>): void btf_type_show(const struct btf *btf, u32 type_id, void *obj, ^ kernel/bpf/btf.c:5269:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void btf_type_show(const struct btf *btf, u32 type_id, void *obj, ^ static 1 warning generated. vim +/btf_type_show +5269 kernel/bpf/btf.c 5268 5270 struct btf_show *show) 5271 { 5272 const struct btf_type *t = btf_type_by_id(btf, type_id); 5273 5274 show->btf = btf; 5275 memset(&show->state, 0, sizeof(show->state)); 5276 memset(&show->obj, 0, sizeof(show->obj)); 5277 5278 btf_type_ops(t)->show(btf, t, type_id, obj, 0, show); 5279 } 5280 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org