Hi Giovanni, Thank you for the patch! Yet something to improve: [auto build test ERROR on tip/x86/core] [also build test ERROR on tip/master v5.10-rc3 next-20201110] [cannot apply to bp/for-next] [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] url: https://github.com/0day-ci/linux/commits/Giovanni-Gherdovich/Add-support-... base: https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git 238c91115cd05c71447ea071624a4c9fe661f970 config: x86_64-randconfig-s021-20201110 (attached as .config) compiler: gcc-9 (Debian 9.3.0-15) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.3-76-gf680124b-dirty # https://github.com/0day-ci/linux/commit/5a6d809273fed25f523b18d553f61b6d7... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Giovanni-Gherdovich/Add-support-for-frequency-invariance-to-AMD-EPYC-Zen2/20201110-164202 git checkout 5a6d809273fed25f523b18d553f61b6d746eed76 # save the attached .config to linux build tree make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=x86_64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): ld: arch/x86/kernel/smpboot.o: in function `amd_set_max_freq_ratio': vim +2042 arch/x86/kernel/smpboot.c 2033 2034 #ifdef CONFIG_ACPI 2035 static bool amd_set_max_freq_ratio(void) 2036 { 2037 struct cppc_perf_caps perf_caps; 2038 u64 highest_perf, nominal_perf; 2039 u64 perf_ratio; 2040 int rc; 2041 2043 if (rc) { 2044 pr_debug("Could not retrieve perf counters (%d)\n", rc); 2045 return false; 2046 } 2047 2048 highest_perf = perf_caps.highest_perf; 2049 nominal_perf = perf_caps.nominal_perf; 2050 2051 if (!highest_perf || !nominal_perf) { 2052 pr_debug("Could not retrieve highest or nominal performance\n"); 2053 return false; 2054 } 2055 2056 perf_ratio = div_u64(highest_perf * SCHED_CAPACITY_SCALE, nominal_perf); 2057 if (!perf_ratio) { 2058 pr_debug("Non-zero highest/nominal perf values led to a 0 ratio\n"); 2059 return false; 2060 } 2061 2062 arch_turbo_freq_ratio = perf_ratio; 2063 arch_set_max_freq_ratio(false); 2064 2065 return true; 2066 } 2067 #else 2068 static bool amd_set_max_freq_ratio(void) 2069 { 2070 return false; 2071 } 2072 #endif 2073 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org