linux-kernel - Re: [PATCH] x86/cpu: sort cpuinfo flags

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Message-ID: <201812221501.YwaymdrV%fengguang.wu@intel.com>
Date:   Sat, 22 Dec 2018 15:17:19 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Dave Hansen <dave.hansen@...ux.intel.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>
Subject: Re: [PATCH] x86/cpu: sort cpuinfo flags

Hi Dave,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v4.20-rc7 next-20181221]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Dave-Hansen/x86-cpu-sort-cpuinfo-flags/20181221-171144
config: x86_64-randconfig-s2-12221353 (attached as .config)
compiler: gcc-6 (Debian 6.4.0-9) 6.4.0 20171026
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/proc.c: In function 'show_cpuinfo':
>> arch/x86/kernel/cpu/proc.c:175:26: error: 'x86_NR_CAPS' undeclared (first use in this function)
      unsigned int bug_bit = x86_NR_CAPS + i;
                             ^~~~~~~~~~~
   arch/x86/kernel/cpu/proc.c:175:26: note: each undeclared identifier is reported only once for each function it appears in

vim +/x86_NR_CAPS +175 arch/x86/kernel/cpu/proc.c

   128	
   129	static int show_cpuinfo(struct seq_file *m, void *v)
   130	{
   131		struct cpuinfo_x86 *c = v;
   132		unsigned int cpu;
   133		int i;
   134	
   135		cpu = c->cpu_index;
   136		seq_printf(m, "processor\t: %u\n"
   137			   "vendor_id\t: %s\n"
   138			   "cpu family\t: %d\n"
   139			   "model\t\t: %u\n"
   140			   "model name\t: %s\n",
   141			   cpu,
   142			   c->x86_vendor_id[0] ? c->x86_vendor_id : "unknown",
   143			   c->x86,
   144			   c->x86_model,
   145			   c->x86_model_id[0] ? c->x86_model_id : "unknown");
   146	
   147		if (c->x86_stepping || c->cpuid_level >= 0)
   148			seq_printf(m, "stepping\t: %d\n", c->x86_stepping);
   149		else
   150			seq_puts(m, "stepping\t: unknown\n");
   151		if (c->microcode)
   152			seq_printf(m, "microcode\t: 0x%x\n", c->microcode);
   153	
   154		if (cpu_has(c, X86_FEATURE_TSC)) {
   155			unsigned int freq = aperfmperf_get_khz(cpu);
   156	
   157			if (!freq)
   158				freq = cpufreq_quick_get(cpu);
   159			if (!freq)
   160				freq = cpu_khz;
   161			seq_printf(m, "cpu MHz\t\t: %u.%03u\n",
   162				   freq / 1000, (freq % 1000));
   163		}
   164	
   165		/* Cache size */
   166		if (c->x86_cache_size)
   167			seq_printf(m, "cache size\t: %u KB\n", c->x86_cache_size);
   168	
   169		show_cpuinfo_core(m, c, cpu);
   170		show_cpuinfo_misc(m, c);
   171		show_cpuinfo_flags(m, c);
   172	
   173		seq_puts(m, "\nbugs\t\t:");
   174		for (i = 0; i < 32*NBUGINTS; i++) {
 > 175			unsigned int bug_bit = x86_NR_CAPS + i;
   176	
   177			if (cpu_has_bug(c, bug_bit) && x86_bug_flags[i])
   178				seq_printf(m, " %s", x86_bug_flags[i]);
   179		}
   180	
   181		seq_printf(m, "\nbogomips\t: %lu.%02lu\n",
   182			   c->loops_per_jiffy/(500000/HZ),
   183			   (c->loops_per_jiffy/(5000/HZ)) % 100);
   184	

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