Hi Jianyong, I love your patch! Yet something to improve: [auto build test ERROR on linus/master] [also build test ERROR on v5.10-rc3 next-20201111] [cannot apply to tip/timers/core kvmarm/next kvm/linux-next] [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/Jianyong-Wu/Enable-ptp_kvm-for-a... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git eccc876724927ff3b9ff91f36f7b6b159e948f0c config: arm-randconfig-c004-20201111 (attached as .config) compiler: arm-linux-gnueabi-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/863f46b4f315744c8460d39c4e212737f... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Jianyong-Wu/Enable-ptp_kvm-for-arm-arm64/20201111-142600 git checkout 863f46b4f315744c8460d39c4e212737fecb4de9 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 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 >>): arm-linux-gnueabi-ld: arch/arm/kernel/sleep.o: in function `__cpu_suspend': (.text+0x60): undefined reference to `cpu_sa110_suspend_size' arm-linux-gnueabi-ld: arch/arm/kernel/setup.o: in function `setup_arch': arm-linux-gnueabi-ld: arch/arm/kernel/suspend.o: in function `__cpu_suspend_save': suspend.c:(.text+0x138): undefined reference to `cpu_sa110_do_suspend' arm-linux-gnueabi-ld: suspend.c:(.text+0x170): undefined reference to `cpu_sa110_do_resume' arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-smc.o: in function `__scm_smc_do_quirk': qcom_scm-smc.c:(.text+0x54): undefined reference to `__arm_smccc_smc' arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-legacy.o: in function `scm_legacy_call': qcom_scm-legacy.c:(.text+0x168): undefined reference to `__arm_smccc_smc' arm-linux-gnueabi-ld: drivers/firmware/qcom_scm-legacy.o: in function `scm_legacy_call_atomic': qcom_scm-legacy.c:(.text+0x2e0): undefined reference to `__arm_smccc_smc' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org