tree: https://github.com/intel/tdx.git kvm-upstream head: bdfe06c17daab60c196ff80c1d98467a1d3734fa commit: 3545bcde2d72e4b5b5f16571788aac0ddb5f49a5 [73/152] KVM: TDX: Add KVM TDX system-wide initialization and teardown config: i386-randconfig-m021-20211216 (https://download.01.org/0day-ci/archive/20211216/202112162007.5fUQkqjb-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://github.com/intel/tdx/commit/3545bcde2d72e4b5b5f16571788aac0ddb5f49a5 git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx kvm-upstream git checkout 3545bcde2d72e4b5b5f16571788aac0ddb5f49a5 # save the config file to linux build tree mkdir build_dir make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash 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/kvm/vmx/main.c: In function 'vt_hardware_setup': 25 | enable_tdx = false; | ^ -- arch/x86/kvm/vmx/tdx_stubs.c:4:13: error: no previous prototype for 'tdx_pre_kvm_init' [-Werror=missing-prototypes] 4 | void __init tdx_pre_kvm_init(unsigned int *vcpu_size, | ^~~~~~~~~~~~~~~~ 6 | int __init tdx_hardware_setup(struct kvm_x86_ops *x86_ops) { return -EOPNOTSUPP; } | ^~~~~~~~~~~~~~~~~~ 7 | void tdx_hardware_enable(void) {} | ^~~~~~~~~~~~~~~~~~~ 8 | void tdx_hardware_disable(void) {} | ^~~~~~~~~~~~~~~~~~~~ cc1: all warnings being treated as errors vim +25 arch/x86/kvm/vmx/main.c 15 16 static __init int vt_hardware_setup(void) 17 { 18 int ret; 19 20 ret = vmx_hardware_setup(); 21 if (ret) 22 return ret; 23 24 if (enable_tdx && tdx_hardware_setup(&vt_x86_ops)) 26 return 0; 27 } 28 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org