tree: https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git bpf_tramp head: 79342704f7a85cae631373124998449f047fa0f1 commit: 1d5c082bc909135b1e206a34e0cfcd57d29dbd62 [4/6] bpf: introduce BPF trampoline config: xtensa-allyesconfig (attached as .config) compiler: xtensa-linux-gcc (GCC) 7.4.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 1d5c082bc909135b1e206a34e0cfcd57d29dbd62 # save the attached .config to linux build tree GCC_VERSION=7.4.0 make.cross ARCH=xtensa If you fix the issue, kindly add following tag Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): kernel/bpf/syscall.c: In function 'fentry_hack': ftrace_arch_code_modify_prepare(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ trace_rb_cpu_prepare ftrace_arch_code_modify_post_process(); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +1822 kernel/bpf/syscall.c 1816 1817 int ff_update_ftrace_func(unsigned long ip, unsigned long addr); 1818 int fentry_hack(struct bpf_prog *prog) 1819 { 1820 int ret; 1821 1823 ret = ff_update_ftrace_func((long)prog->aux->attach_func_addr, 1824 (long)prog->aux->trampoline); 1826 return ret; 1827 } 1828 --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation