Hi Chang, First bad commit (maybe != root cause): tree: https://github.com/intel/linux-intel-lts.git 5.10/yocto head: c1454bb2993a11fdcd48794cdd65569c3b33a5b0 commit: a3595cf89d33d08bb53ff3e31160e3f1fb45a1e5 [19765/19803] x86/cpu: Enable Key Locker and add a chicken bit config: x86_64-buildonly-randconfig-r005-20211214 (https://download.01.org/0day-ci/archive/20211216/202112161208.ocGnA7IL-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/linux-intel-lts/commit/a3595cf89d33d08bb53ff3e31... git remote add intel-lts https://github.com/intel/linux-intel-lts.git git fetch --no-tags intel-lts 5.10/yocto git checkout a3595cf89d33d08bb53ff3e31160e3f1fb45a1e5 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/kernel/ 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 >>): arch/x86/kernel/keylocker.c: In function 'check_keylocker_readiness': 31 | (acpi_sleep_state_supported(ACPI_STATE_S3) || | ^~~~~~~~~~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/acpi_sleep_state_supported +31 arch/x86/kernel/keylocker.c f8928662d77653 Chang S. Bae 2019-10-23 16 60adaad4f7cfbd Chang S. Bae 2019-10-23 17 bool check_keylocker_readiness(void) 60adaad4f7cfbd Chang S. Bae 2019-10-23 18 { 60adaad4f7cfbd Chang S. Bae 2019-10-23 19 u32 eax, ebx, ecx, edx; 60adaad4f7cfbd Chang S. Bae 2019-10-23 20 60adaad4f7cfbd Chang S. Bae 2019-10-23 21 cpuid_count(KL_CPUID, 0, &eax, &ebx, &ecx, &edx); 60adaad4f7cfbd Chang S. Bae 2019-10-23 22 /* BIOS may not enable it on some systems. */ 60adaad4f7cfbd Chang S. Bae 2019-10-23 23 if (!(ebx & KL_CPUID_EBX_AESKLE)) { 60adaad4f7cfbd Chang S. Bae 2019-10-23 24 pr_debug("x86/keylocker: not fully enabled\n"); 60adaad4f7cfbd Chang S. Bae 2019-10-23 25 return false; 60adaad4f7cfbd Chang S. Bae 2019-10-23 26 } 60adaad4f7cfbd Chang S. Bae 2019-10-23 27 f8928662d77653 Chang S. Bae 2019-10-23 28 iwkeybackup_available = (ebx & KL_CPUID_EBX_BACKUP); f8928662d77653 Chang S. Bae 2019-10-23 29 /* IWKey backup is essential with S3/4 states */ f8928662d77653 Chang S. Bae 2019-10-23 30 if (!iwkeybackup_available && f8928662d77653 Chang S. Bae 2019-10-23 @31 (acpi_sleep_state_supported(ACPI_STATE_S3) || f8928662d77653 Chang S. Bae 2019-10-23 32 acpi_sleep_state_supported(ACPI_STATE_S4))) { f8928662d77653 Chang S. Bae 2019-10-23 33 pr_debug("x86/keylocker: no key backup support with possible S3/4\n"); f8928662d77653 Chang S. Bae 2019-10-23 34 return false; f8928662d77653 Chang S. Bae 2019-10-23 35 } 60adaad4f7cfbd Chang S. Bae 2019-10-23 36 return true; 60adaad4f7cfbd Chang S. Bae 2019-10-23 37 } 60adaad4f7cfbd Chang S. Bae 2019-10-23 38 :::::: The code at line 31 was first introduced by commit :::::: f8928662d77653e9fdbd10c84f4be00641cba84f x86/power: Restore Key Locker's internal key from Sleep or Hibernate state :::::: TO: Chang S. Bae <chang.seok.bae(a)intel.com&gt; :::::: CC: nanli2x <nanx.li(a)intel.com&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org