tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   395a61741f7ea29e1f4a0d6e160197fe8e377572
commit: 966f2e1a4a340ef17fef4e35ddbff3f2043ce8d7 [2750/4901] net: lan966x: Implement get_ts_info
config: arm64-buildonly-randconfig-r005-20220209 (https://download.01.org/0day-ci/archive/20220210/202202101833.UDN2d73E-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project e8bff9ae54a55b4dbfeb6ba55f723abbd81bf494)
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
        # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=966f2e1a4a340ef17fef4e35ddbff3f2043ce8d7
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 966f2e1a4a340ef17fef4e35ddbff3f2043ce8d7
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> ld.lld: error: undefined symbol: ptp_clock_index
   >>> referenced by lan966x_ethtool.c
   >>> net/ethernet/microchip/lan966x/lan966x_ethtool.o:(lan966x_get_ts_info) in archive drivers/built-in.a

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org