tree: https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git fexit_fix head: d0953e3c28d70fa9d39e6db07d2cffbe7ce1f0e2 commit: d0953e3c28d70fa9d39e6db07d2cffbe7ce1f0e2 [2/2] bpf: Fix fexit trampoline. config: x86_64-randconfig-a001-20210312 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project dfd27ebbd0eb137c9a439b7c537bb87ba903efd3) 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://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git/commit/?id=d0... git remote add ast https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git git fetch --no-tags ast fexit_fix git checkout d0953e3c28d70fa9d39e6db07d2cffbe7ce1f0e2 # 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 >>): struct bpf_trampoline_image *bpf_trampoline_image_alloc(u64 key, u32 idx) ^ kernel/bpf/trampoline.c:199:1: note: declare 'static' if the function is not intended to be used outside of this translation unit struct bpf_trampoline_image *bpf_trampoline_image_alloc(u64 key, u32 idx) ^ static 1 warning generated. vim +/bpf_trampoline_image_alloc +199 kernel/bpf/trampoline.c 198 200 { 201 struct bpf_trampoline_image *im; 202 struct bpf_ksym *ksym; 203 void *image; 204 int err = -ENOMEM; 205 206 im = kzalloc(sizeof(*im), GFP_KERNEL); 207 if (!im) 208 goto out; 209 210 err = bpf_jit_charge_modmem(1); 211 if (err) 212 goto out_free_im; 213 214 err = -ENOMEM; 215 im->image = image = bpf_jit_alloc_exec_page(); 216 if (!image) 217 goto out_uncharge; 218 219 ksym = &im->ksym; 220 INIT_LIST_HEAD_RCU(&ksym->lnode); 221 snprintf(ksym->name, KSYM_NAME_LEN, "bpf_trampoline_%llu_%u", key, idx); 222 bpf_image_ksym_add(image, ksym); 223 return im; 224 225 out_uncharge: 226 bpf_jit_uncharge_modmem(1); 227 out_free_im: 228 kfree(im); 229 out: 230 return ERR_PTR(err); 231 } 232 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org