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/cd5e5083db55d9959f564a72bc348d834... 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 cd5e5083db55d9959f564a72bc348d83425a2838 # 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); | ^~~~~~~~~~~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c:19:6: warning: no previous prototype for '__kvm_check_ubsan_data' [-Wmissing-prototypes] 19 | void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) | ^~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c: In function '__kvm_check_ubsan_data': 21 | switch (slot->type) { | ^~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c: At top level: arch/arm64/kvm/kvm_ubsan_buffer.c:62:6: warning: no previous prototype for 'iterate_kvm_ubsan_buffer' [-Wmissing-prototypes] 62 | void iterate_kvm_ubsan_buffer(unsigned long left, unsigned long right) | ^~~~~~~~~~~~~~~~~~~~~~~~ arch/arm64/kvm/kvm_ubsan_buffer.c:75:6: warning: no previous prototype for '__kvm_check_ubsan_buffer' [-Wmissing-prototypes] 75 | void __kvm_check_ubsan_buffer(void) | ^~~~~~~~~~~~~~~~~~~~~~~~ -- In file included from arch/arm64/kvm/hyp/nvhe/hyp-main.c:16: arch/arm64/kvm/hyp/include/hyp/test_ubsan.h: In function 'test_ubsan_out_of_bounds': 55 | volatile int arr[4]; | ^~~ arch/arm64/kvm/hyp/include/hyp/test_ubsan.h: In function 'test_ubsan_load_invalid_value': 63 | bool val, val2, *ptr; | ^~~ arch/arm64/kvm/hyp/include/hyp/test_ubsan.h: In function 'test_ubsan_object_size_mismatch': 87 | volatile long long *ptr, val2; | ^~~~ arch/arm64/kvm/hyp/nvhe/hyp-main.c: At top level: arch/arm64/kvm/hyp/nvhe/hyp-main.c:183:6: warning: no previous prototype for 'handle_trap' [-Wmissing-prototypes] 183 | void handle_trap(struct kvm_cpu_context *host_ctxt) | ^~~~~~~~~~~ vim +/UBSAN_NONE +21 arch/arm64/kvm/kvm_ubsan_buffer.c aba3219bbab3bb5c George Popescu 2021-01-14 15 aba3219bbab3bb5c George Popescu 2021-01-14 16 DECLARE_KVM_DEBUG_BUFFER(struct kvm_ubsan_info, kvm_ubsan_buffer, aba3219bbab3bb5c George Popescu 2021-01-14 17 kvm_ubsan_buff_wr_ind, KVM_UBSAN_BUFFER_SIZE); aba3219bbab3bb5c George Popescu 2021-01-14 18 c8a90dc1d55ba5e3 George Popescu 2021-01-14 19 void __kvm_check_ubsan_data(struct kvm_ubsan_info *slot) c8a90dc1d55ba5e3 George Popescu 2021-01-14 20 { c8a90dc1d55ba5e3 George Popescu 2021-01-14 @21 switch (slot->type) { c8a90dc1d55ba5e3 George Popescu 2021-01-14 22 case UBSAN_OUT_OF_BOUNDS: c8a90dc1d55ba5e3 George Popescu 2021-01-14 23 __ubsan_handle_out_of_bounds(&slot->out_of_bounds_data, c8a90dc1d55ba5e3 George Popescu 2021-01-14 24 slot->u_val.lval); c8a90dc1d55ba5e3 George Popescu 2021-01-14 25 break; 125f434abd282604 George Popescu 2021-01-14 26 case UBSAN_UNREACHABLE_DATA: 125f434abd282604 George Popescu 2021-01-14 27 __ubsan_handle_builtin_unreachable(&slot->unreachable_data); 125f434abd282604 George Popescu 2021-01-14 28 break; 3bd940afa9486b82 George Popescu 2021-01-14 29 case UBSAN_SHIFT_OUT_OF_BOUNDS: 3bd940afa9486b82 George Popescu 2021-01-14 30 __ubsan_handle_shift_out_of_bounds(&slot->shift_out_of_bounds_data, 3bd940afa9486b82 George Popescu 2021-01-14 31 slot->u_val.lval, slot->u_val.rval); 3bd940afa9486b82 George Popescu 2021-01-14 32 break; 3b42f0d25b7dd280 George Popescu 2021-01-14 33 case UBSAN_INVALID_DATA: 3b42f0d25b7dd280 George Popescu 2021-01-14 34 __ubsan_handle_load_invalid_value(&slot->invalid_value_data, 3b42f0d25b7dd280 George Popescu 2021-01-14 35 slot->u_val.lval); 3b42f0d25b7dd280 George Popescu 2021-01-14 36 break; e7832e63ca596782 George Popescu 2021-01-14 37 case UBSAN_TYPE_MISMATCH: e7832e63ca596782 George Popescu 2021-01-14 38 __ubsan_handle_type_mismatch(&slot->type_mismatch_data, e7832e63ca596782 George Popescu 2021-01-14 39 slot->u_val.lval); e7832e63ca596782 George Popescu 2021-01-14 40 break; aaa9326468ea971e George Popescu 2021-01-14 41 case UBSAN_OVERFLOW_DATA: aaa9326468ea971e George Popescu 2021-01-14 42 if (slot->u_val.op == '/') { aaa9326468ea971e George Popescu 2021-01-14 43 __ubsan_handle_divrem_overflow(&slot->overflow_data, aaa9326468ea971e George Popescu 2021-01-14 44 slot->u_val.lval, slot->u_val.rval); aaa9326468ea971e George Popescu 2021-01-14 45 } else if (slot->u_val.op == '!') { aaa9326468ea971e George Popescu 2021-01-14 46 __ubsan_handle_negate_overflow(&slot->overflow_data, aaa9326468ea971e George Popescu 2021-01-14 47 slot->u_val.lval); aaa9326468ea971e George Popescu 2021-01-14 48 } else if (slot->u_val.op == '+') { aaa9326468ea971e George Popescu 2021-01-14 49 __ubsan_handle_add_overflow(&slot->overflow_data, aaa9326468ea971e George Popescu 2021-01-14 50 slot->u_val.lval, slot->u_val.rval); aaa9326468ea971e George Popescu 2021-01-14 51 } else if (slot->u_val.op == '-') { aaa9326468ea971e George Popescu 2021-01-14 52 __ubsan_handle_sub_overflow(&slot->overflow_data, aaa9326468ea971e George Popescu 2021-01-14 53 slot->u_val.lval, slot->u_val.rval); aaa9326468ea971e George Popescu 2021-01-14 54 } else if (slot->u_val.op == '*') { aaa9326468ea971e George Popescu 2021-01-14 55 __ubsan_handle_mul_overflow(&slot->overflow_data, aaa9326468ea971e George Popescu 2021-01-14 56 slot->u_val.lval, slot->u_val.rval); aaa9326468ea971e George Popescu 2021-01-14 57 } aaa9326468ea971e George Popescu 2021-01-14 58 break; c8a90dc1d55ba5e3 George Popescu 2021-01-14 59 } c8a90dc1d55ba5e3 George Popescu 2021-01-14 60 } aba3219bbab3bb5c George Popescu 2021-01-14 61 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org