linux-kernel - [mingo-tip:master 583/2382] kernel/kallsyms.c:895:81: error: invalid application of 'sizeof' to an incomplete type 'struct kallsyms

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Message-ID: <202201140216.czBUwf1E-lkp@intel.com>
Date:   Fri, 14 Jan 2022 02:24:34 +0800
From:   kernel test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [mingo-tip:master 583/2382] kernel/kallsyms.c:895:81: error: invalid
 application of 'sizeof' to an 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/20220114/202201140216.czBUwf1E-lkp@intel.com/config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 244dd2913a43a200f5a6544d424cdc37b771028b)
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=4357bf918816f743b593665e792f78913f0da47b
        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@...el.com>

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;
                  ^
   kernel/kallsyms.c:905:85: error: subscript of pointer to incomplete type 'struct kallsyms_entry'
                   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 +895 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++) {
   905			printk("# kallsyms entry %6ld/%6ld: [%016Lx]: {%s}\n", i, nr_entries, (u64)entries[i].offset, str);
   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
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