Hi Andrii, I love your patch! Perhaps something to improve: [auto build test WARNING on bpf-next/master] url: https://github.com/0day-ci/linux/commits/Andrii-Nakryiko/Support-kernel-module-ksym-variables/20210106-144531 base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master config: x86_64-randconfig-a015-20210106 (attached as .config) compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 5c951623bc8965fa1e89660f2f5f4a2944e4981a) 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 # https://github.com/0day-ci/linux/commit/1dde2eabb1a7670d0e764e46dae1ef0a9abf0466 git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Andrii-Nakryiko/Support-kernel-module-ksym-variables/20210106-144531 git checkout 1dde2eabb1a7670d0e764e46dae1ef0a9abf0466 # 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@xxxxxxxxx> All warnings (new ones prefixed by >>): kernel/bpf/core.c:1350:12: warning: no previous prototype for function 'bpf_probe_read_kernel' [-Wmissing-prototypes] u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr) ^ kernel/bpf/core.c:1350:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u64 __weak bpf_probe_read_kernel(void *dst, u32 size, const void *unsafe_ptr) ^ static kernel/bpf/core.c:1704:6: warning: no previous prototype for function 'bpf_patch_call_args' [-Wmissing-prototypes] void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth) ^ kernel/bpf/core.c:1704:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void bpf_patch_call_args(struct bpf_insn *insn, u32 stack_depth) ^ static kernel/bpf/core.c:2102:6: warning: no previous prototype for function '__bpf_free_used_maps' [-Wmissing-prototypes] void __bpf_free_used_maps(struct bpf_prog_aux *aux, ^ kernel/bpf/core.c:2102:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __bpf_free_used_maps(struct bpf_prog_aux *aux, ^ static >> kernel/bpf/core.c:2122:6: warning: no previous prototype for function '__bpf_free_used_btfs' [-Wmissing-prototypes] void __bpf_free_used_btfs(struct bpf_prog_aux *aux, ^ kernel/bpf/core.c:2122:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void __bpf_free_used_btfs(struct bpf_prog_aux *aux, ^ static 4 warnings generated. vim +/__bpf_free_used_btfs +2122 kernel/bpf/core.c 2101 > 2102 void __bpf_free_used_maps(struct bpf_prog_aux *aux, 2103 struct bpf_map **used_maps, u32 len) 2104 { 2105 struct bpf_map *map; 2106 u32 i; 2107 2108 for (i = 0; i < len; i++) { 2109 map = used_maps[i]; 2110 if (map->ops->map_poke_untrack) 2111 map->ops->map_poke_untrack(map, aux); 2112 bpf_map_put(map); 2113 } 2114 } 2115 2116 static void bpf_free_used_maps(struct bpf_prog_aux *aux) 2117 { 2118 __bpf_free_used_maps(aux, aux->used_maps, aux->used_map_cnt); 2119 kfree(aux->used_maps); 2120 } 2121 > 2122 void __bpf_free_used_btfs(struct bpf_prog_aux *aux, 2123 struct btf_mod_pair *used_btfs, u32 len) 2124 { 2125 #ifdef CONFIG_BPF_SYSCALL 2126 struct btf_mod_pair *btf_mod; 2127 u32 i; 2128 2129 for (i = 0; i < len; i++) { 2130 btf_mod = &used_btfs[i]; 2131 if (btf_mod->module) 2132 module_put(btf_mod->module); 2133 btf_put(btf_mod->btf); 2134 } 2135 #endif 2136 } 2137 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx
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