Hi Quentin, FYI, the error/warning still remains. tree: https://android.googlesource.com/kernel/common android12-5.10-2021-09 head: 0a07ca4e42c839ccc8cfcfa63078c9cb580c7d3b commit: 68bd98a28aa622358c73420792329221c86fbe0c [6685/10851] FROMLIST: KVM: arm64: Wrap the host with a stage 2 config: arm64-buildonly-randconfig-r004-20211004 (attached as .config) compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project c0039de2953d15815448b4b3c3bafb45607781e0) 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 git remote add android-common https://android.googlesource.com/kernel/common git fetch --no-tags android-common android12-5.10-2021-09 git checkout 68bd98a28aa622358c73420792329221c86fbe0c # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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 >>): void _kvm_host_prot_finalize(void *discard) ^ arch/arm64/kvm/arm.c:1906:1: note: declare 'static' if the function is not intended to be used outside of this translation unit void _kvm_host_prot_finalize(void *discard) ^ static 1 warning generated. vim +/_kvm_host_prot_finalize +1906 arch/arm64/kvm/arm.c 1905 1907 { 1908 WARN_ON(kvm_call_hyp_nvhe(__pkvm_prot_finalize)); 1909 } 1910 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org