[kbuild-all] [mingo-tip:master 583/2382] kernel/kallsyms.c:905:85: error: subscript of pointer to incomplete type 'struct kallsyms_entry'

tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master head: 1a880941a087613ed42f77001229edfcf75ea8a5 commit: 4357bf918816f743b593665e792f78913f0da47b [583/2382] kallsyms/objtool: Process entries config: x86_64-randconfig-a015-20220109 (https://download.01.org/0day-ci/archive/20220114/202201140617.BMMz1dhu-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d1021978b8e7e35dcc30201ca1731d64b5a602a8) 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/mingo/tip.git/commit/?id=... git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git git fetch --no-tags mingo-tip master git checkout 4357bf918816f743b593665e792f78913f0da47b # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; Note: the mingo-tip/master HEAD 1a880941a087613ed42f77001229edfcf75ea8a5 builds fine. It only hurts bisectability. All errors (new ones prefixed by >>): kernel/kallsyms.c:586:12: warning: no previous prototype for function 'arch_get_kallsym' [-Wmissing-prototypes] int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, ^ kernel/kallsyms.c:586:1: note: declare 'static' if the function is not intended to be used outside of this translation unit int __weak arch_get_kallsym(unsigned int symnum, unsigned long *value, ^ static kernel/kallsyms.c:895:81: error: invalid application of 'sizeof' to an incomplete type 'struct kallsyms_entry' nr_entries = ((long)&__kallsyms_offsets_end - (long)&__kallsyms_offsets_begin)/sizeof(struct kallsyms_entry); ^ ~~~~~~~~~~~~~~~~~~~~~~~ kernel/kallsyms.c:889:9: note: forward declaration of 'struct kallsyms_entry' struct kallsyms_entry *entries; ^ printk("# kallsyms entry %6ld/%6ld: [%016Lx]: {%s}\n", i, nr_entries, (u64)entries[i].offset, str); ~~~~~~~^ include/linux/printk.h:450:60: note: expanded from macro 'printk' #define printk(fmt, ...) printk_index_wrap(_printk, fmt, ##__VA_ARGS__) ^~~~~~~~~~~ include/linux/printk.h:422:19: note: expanded from macro 'printk_index_wrap' _p_func(_fmt, ##__VA_ARGS__); \ ^~~~~~~~~~~ kernel/kallsyms.c:889:9: note: forward declaration of 'struct kallsyms_entry' struct kallsyms_entry *entries; ^ 1 warning and 2 errors generated. vim +905 kernel/kallsyms.c 886 887 static void __init kallsyms_objtool_init(void) 888 { 889 struct kallsyms_entry *entries; 890 long nr_entries, i; 891 char *str; 892 893 printk("# kallsyms_objtool_init()\n"); 894 895 nr_entries = ((long)&__kallsyms_offsets_end - (long)&__kallsyms_offsets_begin)/sizeof(struct kallsyms_entry); 896 897 printk("# kallsyms: %ld entries.\n", nr_entries); 898 899 BUG_ON(nr_entries <= 0); 900 901 str = &__kallsyms_strs_begin; 902 entries = (void *) &__kallsyms_offsets_begin; 903 904 for (i = 0; i < nr_entries; i++) { 906 907 str += strlen(str) + 1; 908 909 } 910 printk("# kallsyms, last str: %p\n", str); 911 printk("# kallsyms, &__kallsyms_strs_end: %p\n", &__kallsyms_strs_end); 912 913 BUG_ON(str != &__kallsyms_strs_end); 914 } 915 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org