Hi Krzysztof,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on tip/auto-latest]
[also build test ERROR on linux/master tip/x86/core linus/master v5.5-rc6 next-20200110]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Krzysztof-Piecuch/x86-tsc-Add-tsc_guess-flag-disabling-CPUID-16h-use-for-tsc-calibration/20200115-111400
base:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 425cc0b850aaaa121b4ddf32c029a72e7a260dfb
config: x86_64-randconfig-c002-20200115 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-3) 7.5.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All error/warnings (new ones prefixed by >>):

>> arch/x86//kernel/tsc.c:62:26: error: expected '=', ',', ';', 'asm' or '__attribute__' before 'tsc_guess'
    static bool _read_mostly tsc_guess = 1;
                             ^~~~~~~~~
   arch/x86//kernel/tsc.c: In function 'tsc_guess_setup':
>> arch/x86//kernel/tsc.c:65:25: error: 'tsc_guess' undeclared (first use in this function); did you mean 'tss_desc'?
     return strtobool(buf, &tsc_guess);
                            ^~~~~~~~~
                            tss_desc
   arch/x86//kernel/tsc.c:65:25: note: each undeclared identifier is reported only once for each function it appears in
   arch/x86//kernel/tsc.c: In function 'native_calibrate_tsc':
   arch/x86//kernel/tsc.c:664:26: error: 'tsc_guess' undeclared (first use in this function); did you mean 'tss_desc'?
     if (crystal_khz == 0 && tsc_guess &&
                             ^~~~~~~~~
                             tss_desc
   arch/x86//kernel/tsc.c: In function 'cpu_khz_from_cpuid':
   arch/x86//kernel/tsc.c:703:43: error: 'tsc_guess' undeclared (first use in this function); did you mean 'tss_desc'?
     if (boot_cpu_data.cpuid_level < 0x16 || !tsc_guess)
                                              ^~~~~~~~~
                                              tss_desc
   arch/x86//kernel/tsc.c: In function 'tsc_guess_setup':
>> arch/x86//kernel/tsc.c:66:1: warning: control reaches end of non-void function [-Wreturn-type]
    }
    ^

vim +62 arch/x86//kernel/tsc.c

    61	
  > 62	static bool _read_mostly tsc_guess = 1;
    63	static int __init tsc_guess_setup(char *buf)
    64	{
  > 65		return strtobool(buf, &tsc_guess);
  > 66	}
    67	early_param("tsc_guess", tsc_guess_setup);
    68	

---
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