tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: ba31f97d43be41ca99ab72a6131d7c226306865f commit: 755db23420a1ce4b740186543432983e9bbe713e KVM: arm64: Generate final CTR_EL0 value when running in Protected mode date: 5 months ago config: arm64-randconfig-r024-20210814 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 1f7b25ea76a925aca690da28de9d78db7ca99d0c) 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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit... git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 755db23420a1ce4b740186543432983e9bbe713e # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 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 >>): arch/arm64/kvm/va_layout.c:188:6: warning: no previous prototype for function 'kvm_patch_vector_branch' [-Wmissing-prototypes] void kvm_patch_vector_branch(struct alt_instr *alt, ^ arch/arm64/kvm/va_layout.c:188:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void kvm_patch_vector_branch(struct alt_instr *alt, ^ static arch/arm64/kvm/va_layout.c:286:6: warning: no previous prototype for function 'kvm_get_kimage_voffset' [-Wmissing-prototypes] void kvm_get_kimage_voffset(struct alt_instr *alt, ^ arch/arm64/kvm/va_layout.c:286:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void kvm_get_kimage_voffset(struct alt_instr *alt, ^ static void kvm_compute_final_ctr_el0(struct alt_instr *alt, ^ arch/arm64/kvm/va_layout.c:292:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void kvm_compute_final_ctr_el0(struct alt_instr *alt, ^ static 3 warnings generated. vim +/kvm_compute_final_ctr_el0 +292 arch/arm64/kvm/va_layout.c 291 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org