Hi Andrii, I love your patch! Yet something to improve: [auto build test ERROR on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/Support-BTF-powered-BPF-tracing-programs-for-kernel-modules/20201203-115515 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: ia64-defconfig (attached as .config) compiler: ia64-linux-gcc (GCC) 9.3.0 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 # https://github.com/0day-ci/linux/commit/c0eabf99f8312c12d4c210628360d28bbf915a91 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andrii-Nakryiko/Support-BTF-powered-BPF-tracing-programs-for-kernel-modules/20201203-115515 git checkout c0eabf99f8312c12d4c210628360d28bbf915a91 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=ia64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp@xxxxxxxxx> All errors (new ones prefixed by >>): ia64-linux-ld: kernel/bpf/core.o: in function `bpf_prog_free': >> (.text+0x3d2): undefined reference to `btf_put' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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