Hi Elena, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on arm64/for-next/core] [cannot apply to kvmarm/next soc/for-next arm/for-next xlnx/master v5.11-rc3 next-20210115] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Elena-Petrova/UBSan-Enablement-f... base: https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core config: arm64-allyesconfig (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 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://github.com/0day-ci/linux/commit/c8a90dc1d55ba5e383a58cb48562cfdc8... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Elena-Petrova/UBSan-Enablement-for-hyp-nVHE-code/20210115-112509 git checkout c8a90dc1d55ba5e383a58cb48562cfdc803cb1b0 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 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 >>): In file included from arch/arm64/kvm/kvm_ubsan_buffer.c:12: include/kvm/arm_pmu.h:52:15: warning: 'struct kvm_device_attr' declared inside parameter list will not be visible outside of this definition or declaration 52 | struct kvm_device_attr *attr); | ^~~~~~~~~~~~~~~ include/kvm/arm_pmu.h:54:15: warning: 'struct kvm_device_attr' declared inside parameter list will not be visible outside of this definition or declaration 54 | struct kvm_device_attr *attr); | ^~~~~~~~~~~~~~~ include/kvm/arm_pmu.h:56:15: warning: 'struct kvm_device_attr' declared inside parameter list will not be visible outside of this definition or declaration 56 | struct kvm_device_attr *attr); | ^~~~~~~~~~~~~~~ 20 | void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) | ^~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c:30:6: warning: no previous prototype for 'iterate_kvm_ubsan_buffer' [-Wmissing-prototypes] 30 | void iterate_kvm_ubsan_buffer(unsigned long left, unsigned long right) | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c:43:6: warning: no previous prototype for '__kvm_check_ubsan_buffer' [-Wmissing-prototypes] 43 | void __kvm_check_ubsan_buffer(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ vim +/__kvm_check_ubsan_data +20 arch/arm64/kvm/kvm_ubsan_buffer.c 16 17 DECLARE_KVM_DEBUG_BUFFER(struct kvm_ubsan_info, kvm_ubsan_buffer, 18 kvm_ubsan_buff_wr_ind, KVM_UBSAN_BUFFER_SIZE); 19 21 { 22 switch (slot->type) { 23 case UBSAN_OUT_OF_BOUNDS: 24 __ubsan_handle_out_of_bounds(&slot->out_of_bounds_data, 25 slot->u_val.lval); 26 break; 27 } 28 } 29 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org