tree: git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git ti-rt-linux-5.10.y head: b9f28fcb222bc4508077366b05ad5d44984087b0 commit: be58a6d2184f996fa51cb83c98426fd634606d63 [3916/10108] spi: cadence-qspi: Tune PHY to allow running at higher frequencies config: arc-randconfig-r043-20211025 (attached as .config) compiler: arc-elf-gcc (GCC) 11.2.0 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 git remote add ti git://git.ti.com/ti-linux-kernel/ti-linux-kernel.git git fetch --no-tags ti ti-rt-linux-5.10.y git checkout be58a6d2184f996fa51cb83c98426fd634606d63 # save the attached .config to linux build tree mkdir build_dir COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross O=build_dir ARCH=arc SHELL=/bin/bash 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 >>): arc-elf-ld: drivers/spi/spi-cadence-quadspi.o: in function `cqspi_phy_check_pattern': spi-cadence-quadspi.c:(.text+0x1e6): undefined reference to `spi_mem_exec_op' --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org