tree: https://github.com/intel/tdx.git kvm-upstream head: cf0e0f3ada8796602d986a2b3b5c91bb2d6126e3 commit: b4ba4adc54d3790157953208dc4deecc7d24005c [24/135] x86/cpu/tsx: Add helper functions to save/restore IA32_TSX_CTRL MSR config: i386-randconfig-a001-20220117 (https://download.01.org/0day-ci/archive/20220122/202201221535.WyckJlw0-lk...) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 7b3d30728816403d1fd73cc5082e9fb761262bce) reproduce (this is a W=1 build): wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # https://github.com/intel/tdx/commit/b4ba4adc54d3790157953208dc4deecc7d24005c git remote add intel-tdx https://github.com/intel/tdx.git git fetch --no-tags intel-tdx kvm-upstream git checkout b4ba4adc54d3790157953208dc4deecc7d24005c # save the config file to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash arch/x86/kernel/cpu/ If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All warnings (new ones prefixed by >>): u64 tsx_ctrl_clear(void) ^ arch/x86/kernel/cpu/tsx.c:186:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u64 tsx_ctrl_clear(void) ^ static void tsx_ctrl_restore(u64 tsx_ctrl) ^ arch/x86/kernel/cpu/tsx.c:199:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void tsx_ctrl_restore(u64 tsx_ctrl) ^ static 2 warnings generated. vim +/tsx_ctrl_clear +186 arch/x86/kernel/cpu/tsx.c 184 185 /* Clear the MSR_TSX_CTRL and return the old value if supported */ 187 { 188 u64 tsx_ctrl = 0; 189 190 if (ia32_tsx_ctrl_supported) { 191 rdmsrl(MSR_IA32_TSX_CTRL, tsx_ctrl); 192 if (tsx_ctrl & MSR_TSX_CTRL_MASK) 193 wrmsrl(MSR_IA32_TSX_CTRL, tsx_ctrl & ~MSR_TSX_CTRL_MASK); 194 } 195 return tsx_ctrl; 196 } 197 EXPORT_SYMBOL_GPL(tsx_ctrl_clear); 198 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org