I need to cast the pointer to "const void __percpu *" before passing into per_cpu_ptr. I will update and resend. On Wed, Sep 16, 2020 at 6:14 PM kernel test robot <lkp(a)intel.com&gt; wrote: > > Hi Hao, > > Thank you for the patch! Perhaps something to improve: > > [auto build test WARNING on bpf-next/master] > > url: https://github.com/0day-ci/linux/commits/Hao-Luo/bpf-BTF-support-for-ksym... > base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master > config: powerpc-randconfig-s032-20200916 (attached as .config) > compiler: powerpc64-linux-gcc (GCC) 9.3.0 > reproduce: > wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross > chmod +x ~/bin/make.cross > # apt-get install sparse > # sparse version: v0.6.2-201-g24bdaac6-dirty > # save the attached .config to linux build tree > COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=powerpc > > If you fix the issue, kindly add following tag as appropriate > Reported-by: kernel test robot <lkp(a)intel.com&gt; > > > sparse warnings: (new ones prefixed by >>) > > >> kernel/bpf/helpers.c:631:31: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected void const [noderef] __percpu *__vpp_verify @@ got void const * @@ > >> kernel/bpf/helpers.c:631:31: sparse: expected void const [noderef] __percpu *__vpp_verify > >> kernel/bpf/helpers.c:631:31: sparse: got void const * > > # https://github.com/0day-ci/linux/commit/3f6ea3c1c73efe466a96ff7499219fe3b... > git remote add linux-review https://github.com/0day-ci/linux > git fetch --no-tags linux-review Hao-Luo/bpf-BTF-support-for-ksyms/20200917-064052 > git checkout 3f6ea3c1c73efe466a96ff7499219fe3b03b8f48 > vim +631 kernel/bpf/helpers.c > > 625 > 626 BPF_CALL_2(bpf_per_cpu_ptr, const void *, ptr, u32, cpu) > 627 { > 628 if (cpu >= nr_cpu_ids) > 629 return (unsigned long)NULL; > 630 > > 631 return (unsigned long)per_cpu_ptr(ptr, cpu); > 632 } > 633 > 634 const struct bpf_func_proto bpf_per_cpu_ptr_proto = { > 635 .func = bpf_per_cpu_ptr, > 636 .gpl_only = false, > 637 .ret_type = RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL, > 638 .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID, > 639 .arg2_type = ARG_ANYTHING, > 640 }; > 641 > > 642 const struct bpf_func_proto bpf_get_current_task_proto __weak; > 643 const struct bpf_func_proto bpf_probe_read_user_proto __weak; > 644 const struct bpf_func_proto bpf_probe_read_user_str_proto __weak; > 645 const struct bpf_func_proto bpf_probe_read_kernel_proto __weak; > 646 const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak; > 647 > > --- > 0-DAY CI Kernel Test Service, Intel Corporation > https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org