Hi Kumar, Thank you for the patch! Yet something to improve: [auto build test ERROR on bpf/master] url: https://github.com/0day-ci/linux/commits/Kumar-Kartikeya-Dwivedi/bpf-Make... base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf.git master config: i386-debian-10.3 (attached as .config) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/0day-ci/linux/commit/ea181ce7046ae7f916b4ede6b04c48416... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Kumar-Kartikeya-Dwivedi/bpf-Make-CONFIG_DEBUG_INFO_BTF-depend-upon-CONFIG_BPF_SYSCALL/20211112-100114 git checkout ea181ce7046ae7f916b4ede6b04c48416d89b0b2 # save the attached .config to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 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 errors (new ones prefixed by >>): kernel/bpf/btf.c: In function 'btf_seq_show': kernel/bpf/btf.c:5876:22: warning: function 'btf_seq_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 5876 | seq_vprintf((struct seq_file *)show->target, fmt, args); | ^~~~~~~~ kernel/bpf/btf.c: In function 'btf_snprintf_show': kernel/bpf/btf.c:5913:2: warning: function 'btf_snprintf_show' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format] 5913 | len = vsnprintf(show->target, ssnprintf->len_left, fmt, args); | ^~~ kernel/bpf/btf.c: At top level: kernel/bpf/btf.c:6349:8: error: redefinition of 'struct kfunc_btf_id_list' 6349 | struct kfunc_btf_id_list { | ^~~~~~~~~~~~~~~~~ In file included from include/linux/bpf_verifier.h:8, from kernel/bpf/btf.c:19: include/linux/btf.h:275:8: note: originally defined here 275 | struct kfunc_btf_id_list {}; | ^~~~~~~~~~~~~~~~~ 6399 | DEFINE_KFUNC_BTF_ID_LIST(bpf_tcp_ca_kfunc_list); | ^~~~~~~~~~~~~~~~~~~~~ kernel/bpf/btf.c:6395:27: note: in definition of macro 'DEFINE_KFUNC_BTF_ID_LIST' 6395 | struct kfunc_btf_id_list name = { LIST_HEAD_INIT(name.list), \ | ^~~~ In file included from include/linux/bpf_verifier.h:8, from kernel/bpf/btf.c:19: include/linux/btf.h:276:33: note: previous declaration of 'bpf_tcp_ca_kfunc_list' was here 276 | static struct kfunc_btf_id_list bpf_tcp_ca_kfunc_list __maybe_unused; | ^~~~~~~~~~~~~~~~~~~~~ 6400 | DEFINE_KFUNC_BTF_ID_LIST(prog_test_kfunc_list); | ^~~~~~~~~~~~~~~~~~~~ kernel/bpf/btf.c:6395:27: note: in definition of macro 'DEFINE_KFUNC_BTF_ID_LIST' 6395 | struct kfunc_btf_id_list name = { LIST_HEAD_INIT(name.list), \ | ^~~~ In file included from include/linux/bpf_verifier.h:8, from kernel/bpf/btf.c:19: include/linux/btf.h:277:33: note: previous declaration of 'prog_test_kfunc_list' was here 277 | static struct kfunc_btf_id_list prog_test_kfunc_list __maybe_unused; | ^~~~~~~~~~~~~~~~~~~~ vim +/bpf_tcp_ca_kfunc_list +6399 kernel/bpf/btf.c 14f267d95fe4b0 Kumar Kartikeya Dwivedi 2021-10-02 6393 14f267d95fe4b0 Kumar Kartikeya Dwivedi 2021-10-02 6394 #define DEFINE_KFUNC_BTF_ID_LIST(name) \ 14f267d95fe4b0 Kumar Kartikeya Dwivedi 2021-10-02 6395 struct kfunc_btf_id_list name = { LIST_HEAD_INIT(name.list), \ 14f267d95fe4b0 Kumar Kartikeya Dwivedi 2021-10-02 6396 __MUTEX_INITIALIZER(name.mutex) }; \ 14f267d95fe4b0 Kumar Kartikeya Dwivedi 2021-10-02 6397 EXPORT_SYMBOL_GPL(name) 0e32dfc80bae53 Kumar Kartikeya Dwivedi 2021-10-02 6398 0e32dfc80bae53 Kumar Kartikeya Dwivedi 2021-10-02 @6399 DEFINE_KFUNC_BTF_ID_LIST(bpf_tcp_ca_kfunc_list); c48e51c8b07aba Kumar Kartikeya Dwivedi 2021-10-02 @6400 DEFINE_KFUNC_BTF_ID_LIST(prog_test_kfunc_list); --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org