Re: [PATCH v2] x86/tsc: Disable clocksource watchdog for TSC on recent UV

[kernel test robot <lkp@intel.com>]

Hi Dimitri,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/x86/core]
[also build test ERROR on tip/master linus/master v6.16 next-20250807]
[cannot apply to tip/auto-latest]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Dimitri-Sivanich/x86-tsc-Disable-clocksource-watchdog-for-TSC-on-recent-UV/20250806-120227
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/aJH9ke0k0HnL8g6h%40hpe.com
patch subject: [PATCH v2] x86/tsc: Disable clocksource watchdog for TSC on recent UV
config: i386-randconfig-011-20250808 (https://download.01.org/0day-ci/archive/20250808/202508081446.3ZnRCG1T-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250808/202508081446.3ZnRCG1T-lkp@intel.com/reproduce)

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/202508081446.3ZnRCG1T-lkp@intel.com/

All errors (new ones prefixed by >>):

>> arch/x86/kernel/tsc.c:1264:39: error: call to undeclared function 'is_uvy_hub'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1264 |             (topology_max_packages() <= 4 || is_uvy_hub()))
         |                                              ^
   arch/x86/kernel/tsc.c:1517:6: error: call to undeclared function 'is_early_uv_system'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
    1517 |         if (is_early_uv_system())
         |             ^
   2 errors generated.


vim +/is_uvy_hub +1264 arch/x86/kernel/tsc.c

  1235	
  1236	static void __init check_system_tsc_reliable(void)
  1237	{
  1238	#if defined(CONFIG_MGEODEGX1) || defined(CONFIG_MGEODE_LX) || defined(CONFIG_X86_GENERIC)
  1239		if (is_geode_lx()) {
  1240			/* RTSC counts during suspend */
  1241	#define RTSC_SUSP 0x100
  1242			unsigned long res_low, res_high;
  1243	
  1244			rdmsr_safe(MSR_GEODE_BUSCONT_CONF0, &res_low, &res_high);
  1245			/* Geode_LX - the OLPC CPU has a very reliable TSC */
  1246			if (res_low & RTSC_SUSP)
  1247				tsc_clocksource_reliable = 1;
  1248		}
  1249	#endif
  1250		if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
  1251			tsc_clocksource_reliable = 1;
  1252	
  1253		/*
  1254		 * Disable the clocksource watchdog when the system has:
  1255		 *  - TSC running at constant frequency
  1256		 *  - TSC which does not stop in C-States
  1257		 *  - the TSC_ADJUST register which allows to detect even minimal
  1258		 *    modifications
  1259		 *  - not more than four packages
  1260		 */
  1261		if (boot_cpu_has(X86_FEATURE_CONSTANT_TSC) &&
  1262		    boot_cpu_has(X86_FEATURE_NONSTOP_TSC) &&
  1263		    boot_cpu_has(X86_FEATURE_TSC_ADJUST) &&
> 1264		    (topology_max_packages() <= 4 || is_uvy_hub()))
  1265			tsc_disable_clocksource_watchdog();
  1266	}
  1267	

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