Hi Kalesh, FYI, the error/warning still remains. tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: bce9332220bd677d83b19d21502776ad555a0e73 commit: 879e5ac7b2e4db05799a905b5a07fc9e5dedf651 KVM: arm64: Prepare non-protected nVHE hypervisor stacktrace date: 4 months ago config: arm64-buildonly-randconfig-r004-20221206 compiler: aarch64-linux-gcc (GCC) 12.1.0 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/?id=879e5ac7b2e4db05799a905b5a07fc9e5dedf651 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 879e5ac7b2e4db05799a905b5a07fc9e5dedf651 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot All warnings (new ones prefixed by >>): >> arch/arm64/kvm/hyp/nvhe/stacktrace.c:46:6: warning: no previous prototype for 'kvm_nvhe_prepare_backtrace' [-Wmissing-prototypes] 46 | void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc) | ^~~~~~~~~~~~~~~~~~~~~~~~~~ vim +/kvm_nvhe_prepare_backtrace +46 arch/arm64/kvm/hyp/nvhe/stacktrace.c 36 37 /* 38 * kvm_nvhe_prepare_backtrace - prepare to dump the nVHE backtrace 39 * 40 * @fp : frame pointer at which to start the unwinding. 41 * @pc : program counter at which to start the unwinding. 42 * 43 * Saves the information needed by the host to dump the nVHE hypervisor 44 * backtrace. 45 */ > 46 void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc) -- 0-DAY CI Kernel Test Service https://01.org/lkp