tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: f8e6dfc64f6135d1b6c5215c14cd30b9b60a0008 commit: e6a4750ffe9d701c4d55212b14b615e63571d235 bpf, xdp: Make bpf_redirect_map() a map operation date: 5 months ago config: powerpc64-buildonly-randconfig-r002-20210812 (attached as .config) compiler: powerpc-linux-gcc (GCC) 11.2.0 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout e6a4750ffe9d701c4d55212b14b615e63571d235 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=powerpc 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 >>): In file included from include/linux/bpf_verifier.h:9, from kernel/bpf/verifier.c:12: kernel/bpf/verifier.c: In function 'jit_subprogs': include/linux/filter.h:363:18: warning: cast between incompatible function types from 'unsigned int (*)(const void *, const struct bpf_insn *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:11662:37: note: in expansion of macro 'BPF_CAST_CALL' 11662 | insn->imm = BPF_CAST_CALL(func[subprog]->bpf_func) - | ^~~~~~~~~~~~~ kernel/bpf/verifier.c: In function 'do_misc_fixups': include/linux/filter.h:363:18: warning: cast between incompatible function types from 'void * (*)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12070:45: note: in expansion of macro 'BPF_CAST_CALL' 12070 | insn->imm = BPF_CAST_CALL(ops->map_lookup_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:363:18: warning: cast between incompatible function types from 'int (*)(struct bpf_map *, void *, void *, u64)' {aka 'int (*)(struct bpf_map *, void *, void *, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12074:45: note: in expansion of macro 'BPF_CAST_CALL' 12074 | insn->imm = BPF_CAST_CALL(ops->map_update_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:363:18: warning: cast between incompatible function types from 'int (*)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12078:45: note: in expansion of macro 'BPF_CAST_CALL' 12078 | insn->imm = BPF_CAST_CALL(ops->map_delete_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:363:18: warning: cast between incompatible function types from 'int (*)(struct bpf_map *, void *, u64)' {aka 'int (*)(struct bpf_map *, void *, long long unsigned int)'} to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12082:45: note: in expansion of macro 'BPF_CAST_CALL' 12082 | insn->imm = BPF_CAST_CALL(ops->map_push_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:363:18: warning: cast between incompatible function types from 'int (*)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12086:45: note: in expansion of macro 'BPF_CAST_CALL' 12086 | insn->imm = BPF_CAST_CALL(ops->map_pop_elem) - | ^~~~~~~~~~~~~ include/linux/filter.h:363:18: warning: cast between incompatible function types from 'int (*)(struct bpf_map *, void *)' to 'u64 (*)(u64, u64, u64, u64, u64)' {aka 'long long unsigned int (*)(long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int, long long unsigned int)'} [-Wcast-function-type] 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12090:45: note: in expansion of macro 'BPF_CAST_CALL' 12090 | insn->imm = BPF_CAST_CALL(ops->map_peek_elem) - | ^~~~~~~~~~~~~ 363 | ((u64 (*)(u64, u64, u64, u64, u64))(x)) | ^ kernel/bpf/verifier.c:12094:45: note: in expansion of macro 'BPF_CAST_CALL' 12094 | insn->imm = BPF_CAST_CALL(ops->map_redirect) - | ^~~~~~~~~~~~~ vim +363 include/linux/filter.h f8f6d679aaa78b Daniel Borkmann 2014-05-29 361 09772d92cd5ad9 Daniel Borkmann 2018-06-02 362 #define BPF_CAST_CALL(x) \ 09772d92cd5ad9 Daniel Borkmann 2018-06-02 @363 ((u64 (*)(u64, u64, u64, u64, u64))(x)) 09772d92cd5ad9 Daniel Borkmann 2018-06-02 364 :::::: The code at line 363 was first introduced by commit :::::: 09772d92cd5ad998b0d5f6f46cd1658f8cb698cf bpf: avoid retpoline for lookup/update/delete calls on maps :::::: TO: Daniel Borkmann <daniel(a)iogearbox.net&gt; :::::: CC: Alexei Starovoitov <ast(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org