Hi Reiji, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on 4ec5183ec48656cec489c49f989c508b68b518e3] url: https://github.com/intel-lab-lkp/linux/commits/Reiji-Watanabe/KVM-arm64-PMU-Introduce-a-helper-to-set-the-guest-s-PMU/20230211-111929 base: 4ec5183ec48656cec489c49f989c508b68b518e3 patch link: https://lore.kernel.org/r/20230211031506.4159098-4-reijiw%40google.com patch subject: [PATCH v4 03/14] KVM: arm64: PMU: Don't use the sanitized value for PMUVer config: arm64-randconfig-r032-20230213 (https://download.01.org/0day-ci/archive/20230216/202302161936.Uzpkezkn-lkp@xxxxxxxxx/config) compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project db89896bbbd2251fff457699635acbbedeead27f) 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 # install arm64 cross compiling tool for clang build # apt-get install binutils-aarch64-linux-gnu # https://github.com/intel-lab-lkp/linux/commit/29753380ce14f6aec0352bcc4762ba2514289849 git remote add linux-review https://github.com/intel-lab-lkp/linux git fetch --no-tags linux-review Reiji-Watanabe/KVM-arm64-PMU-Introduce-a-helper-to-set-the-guest-s-PMU/20230211-111929 git checkout 29753380ce14f6aec0352bcc4762ba2514289849 # save the config file mkdir build_dir && cp config build_dir/.config COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 olddefconfig COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash arch/arm64/kvm/ drivers/hte/ kernel/bpf/ If you fix the issue, kindly add following tag where applicable | Reported-by: kernel test robot <lkp@xxxxxxxxx> | Link: https://lore.kernel.org/oe-kbuild-all/202302161936.Uzpkezkn-lkp@xxxxxxxxx/ All warnings (new ones prefixed by >>): >> arch/arm64/kvm/pmu-emul.c:1059:4: warning: no previous prototype for function 'kvm_arm_pmu_get_pmuver_limit' [-Wmissing-prototypes] u8 kvm_arm_pmu_get_pmuver_limit(void) ^ arch/arm64/kvm/pmu-emul.c:1059:1: note: declare 'static' if the function is not intended to be used outside of this translation unit u8 kvm_arm_pmu_get_pmuver_limit(void) ^ static 1 warning generated. vim +/kvm_arm_pmu_get_pmuver_limit +1059 arch/arm64/kvm/pmu-emul.c 3d0dba5764b943 Marc Zyngier 2022-11-13 1058 3d0dba5764b943 Marc Zyngier 2022-11-13 @1059 u8 kvm_arm_pmu_get_pmuver_limit(void) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests
