Hi Vincenzo, I love your patch! Yet something to improve: [auto build test ERROR on kvmarm/next] [also build test ERROR on linus/master v5.12-rc2 next-20210309] [cannot apply to arm64/for-next/core xlnx/master arm/for-next soc/for-next hnaz-linux-mm/master] [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/Vincenzo-Frascino/arm64-ARMv8-5-... base: https://git.kernel.org/pub/scm/linux/kernel/git/kvmarm/kvmarm.git next config: arm64-randconfig-s032-20210309 (attached as .config) compiler: aarch64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross # apt-get install sparse # sparse version: v0.6.3-262-g5e674421-dirty # https://github.com/0day-ci/linux/commit/660df126323fe5533a1be7834e1754a1a... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Vincenzo-Frascino/arm64-ARMv8-5-A-MTE-Add-async-mode-support/20210309-001716 git checkout 660df126323fe5533a1be7834e1754a1adc69f13 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=arm64 If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): aarch64-linux-ld: mm/maccess.o: in function `copy_from_kernel_nofault': maccess.c:(.text+0x340): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' aarch64-linux-ld: maccess.c:(.text+0x44c): undefined reference to `mte_async_mode' maccess.c:(.text+0x44c): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' aarch64-linux-ld: maccess.c:(.text+0x450): undefined reference to `mte_async_mode' aarch64-linux-ld: maccess.c:(.text+0x474): undefined reference to `mte_async_mode' aarch64-linux-ld: mm/maccess.o:maccess.c:(.text+0x4d0): more undefined references to `mte_async_mode' follow mm/maccess.o: in function `copy_from_kernel_nofault': maccess.c:(.text+0x4d0): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' maccess.c:(.text+0x550): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' mm/maccess.o: in function `copy_to_kernel_nofault': maccess.c:(.text+0x6cc): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' maccess.c:(.text+0x7d8): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' maccess.c:(.text+0x864): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' maccess.c:(.text+0x8ec): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' mm/maccess.o: in function `strncpy_from_kernel_nofault': maccess.c:(.text+0xaac): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' fs/namei.o: in function `full_name_hash': namei.c:(.text+0x28): relocation truncated to fit: R_AARCH64_ADR_PREL_PG_HI21 against undefined symbol `mte_async_mode' fs/namei.o: in function `hashlen_string': namei.c:(.text+0x2a28): additional relocation overflows omitted from the output --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org