[openeuler:OLK-6.6 3493/3493] arch/x86/kernel/cpu/proc.c:63:5: warning: no previous prototype for 'show_cpuinfo'

9 Dec 2025

      Hi GONG,

FYI, the error/warning still remains.

tree:   https://gitee.com/openeuler/kernel.git OLK-6.6
head:   36141432a37f7dedddde8825e724b07ce3a440fb
commit: 9d3b0e8891b8b3450a7cd6d1367946a1c69e4eb9 [3493/3493] bpf: Add cpuinfo_x86 iterator target
config: x86_64-allnoconfig-bpf (https://download.01.org/0day-ci/archive/20251208/202512082137.XtPdHfzc-lkp@i...)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251208/202512082137.XtPdHfzc-lkp@i...)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202512082137.XtPdHfzc-lkp@intel.com/

All warnings (new ones prefixed by >>):
...
...
arch/x86/kernel/cpu/proc.c:63:5: warning: no previous prototype for 'show_cpuinfo' [-Wmissing-prototypes]
      63 | int show_cpuinfo(struct seq_file *m, void *v)
         |     ^~~~~~~~~~~~
vim +/show_cpuinfo +63 arch/x86/kernel/cpu/proc.c

    62
...
63	int show_cpuinfo(struct seq_file *m, void *v)
    64	{
    65		struct cpuinfo_x86 *c = v;
    66		unsigned int cpu;
    67		int i;
    68	
    69		cpu = c->cpu_index;
    70		seq_printf(m, "processor\t: %u\n"
    71			   "vendor_id\t: %s\n"
    72			   "cpu family\t: %d\n"
    73			   "model\t\t: %u\n"
    74			   "model name\t: %s\n",
    75			   cpu,
    76			   c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
    77			   c->x86,
    78			   c->x86_model,
    79			   c->x86_model_id[0] ? c->x86_model_id : "unknown");
    80	
    81		if (c->x86_stepping || c->cpuid_level >= 0)
    82			seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
    83		else
    84			seq_puts(m, "stepping\t: unknown\n");
    85		if (c->microcode)
    86			seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
    87	
    88		if (cpu_has(c, X86_FEATURE_TSC)) {
    89			unsigned int freq = arch_freq_get_on_cpu(cpu);
    90	
    91			seq_printf(m, "cpu MHz\t\t: %u.%03u\n", freq / 1000, (freq % 1000));
    92		}
    93	
    94		/* Cache size */
    95		if (c->x86_cache_size)
    96			seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
    97	
    98		show_cpuinfo_core(m, c, cpu);
    99		show_cpuinfo_misc(m, c);
   100	
   101		seq_puts(m, "flags\t\t:");
   102		for (i = 0; i < 32*NCAPINTS; i++)
   103			if (cpu_has(c, i) && x86_cap_flags[i] != NULL) {
   104				if (c->x86_vendor == X86_VENDOR_HYGON)
   105					seq_printf(m, " %s", i == X86_FEATURE_SEV ? "csv" :
   106						   (i == X86_FEATURE_SEV_ES ? "csv2" :
   107						    x86_cap_flags[i]));
   108				else
   109					seq_printf(m, " %s", x86_cap_flags[i]);
   110			}
   111
-- 
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