[pm:bleeding-edge 5/6] arch/x86/kernel/cpu/proc.c:83: undefined reference to `aperfmperf_get_khz'

[kbuild test robot <fengguang.wu@xxxxxxxxx>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git bleeding-edge
head:   f379d4b265627033aa2f4d68464df7ae3a6a11c9
commit: a1823cba722b8f403f6ad83ec79b17773817fb27 [5/6] x86 / CPU: Always show current CPU frequency in /proc/cpuinfo
config: i386-randconfig-s0-201746 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        git checkout a1823cba722b8f403f6ad83ec79b17773817fb27
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/proc.o: In function `show_cpuinfo':
>> arch/x86/kernel/cpu/proc.c:83: undefined reference to `aperfmperf_get_khz'

vim +83 arch/x86/kernel/cpu/proc.c

    56	
    57	static int show_cpuinfo(struct seq_file *m, void *v)
    58	{
    59		struct cpuinfo_x86 *c = v;
    60		unsigned int cpu;
    61		int i;
    62	
    63		cpu = c->cpu_index;
    64		seq_printf(m, "processor\t: %u\n"
    65			   "vendor_id\t: %s\n"
    66			   "cpu family\t: %d\n"
    67			   "model\t\t: %u\n"
    68			   "model name\t: %s\n",
    69			   cpu,
    70			   c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
    71			   c->x86,
    72			   c->x86_model,
    73			   c->x86_model_id[0] ? c->x86_model_id : "unknown");
    74	
    75		if (c->x86_mask || c->cpuid_level >= 0)
    76			seq_printf(m, "stepping\t: %d\n", c->x86_mask);
    77		else
    78			seq_puts(m, "stepping\t: unknown\n");
    79		if (c->microcode)
    80			seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
    81	
    82		if (cpu_has(c, X86_FEATURE_TSC)) {
  > 83			unsigned int freq = aperfmperf_get_khz(cpu);
    84	
    85			if (!freq)
    86				freq = cpufreq_quick_get(cpu);
    87			if (!freq)
    88				freq = cpu_khz;
    89			seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
    90				   freq / 1000, (freq % 1000));
    91		}
    92	
    93		/* Cache size */
    94		if (c->x86_cache_size >= 0)
    95			seq_printf(m, "cache size\t: %d KB\n", c->x86_cache_size);
    96	
    97		show_cpuinfo_core(m, c, cpu);
    98		show_cpuinfo_misc(m, c);
    99	
   100		seq_puts(m, "flags\t\t:");
   101		for (i = 0; i < 32*NCAPINTS; i++)
   102			if (cpu_has(c, i) && x86_cap_flags[i] != NULL)
   103				seq_printf(m, " %s", x86_cap_flags[i]);
   104	
   105		seq_puts(m, "\nbugs\t\t:");
   106		for (i = 0; i < 32*NBUGINTS; i++) {
   107			unsigned int bug_bit = 32*NCAPINTS + i;
   108	
   109			if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
   110				seq_printf(m, " %s", x86_bug_flags[i]);
   111		}
   112	
   113		seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
   114			   c->loops_per_jiffy/(500000/HZ),
   115			   (c->loops_per_jiffy/(5000/HZ)) % 100);
   116	

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