[cxl:for-6.3/cxl-ram-region 17/18] port.c:undefined reference to `cxl_add_to_region'

[cxl:for-6.3/cxl-ram-region 17/18] port.c:undefined reference to `cxl_add_to_region'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git for-6.3/cxl-ram-region
head:   c30a50b37b7808284c3796e0866e939017bb05b2
commit: f71922e583ef6b6e17575c87e496b17f91193d37 [17/18] cxl/region: Add region autodiscovery
config: arm-randconfig-c002-20230130 (https://download.01.org/0day-ci/archive/20230201/202302011700.R8sickqk-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 12.1.0
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://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=f71922e583ef6b6e17575c87e496b17f91193d37
        git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl for-6.3/cxl-ram-region
        git checkout f71922e583ef6b6e17575c87e496b17f91193d37
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arm-linux-gnueabi-ld: drivers/cxl/port.o: in function `discover_region':
>> port.c:(.text+0x144): undefined reference to `cxl_add_to_region'
   `.exit.text' referenced in section `.alt.smp.init' of drivers/mtd/ubi/gluebi.o: defined in discarded section `.exit.text' of drivers/mtd/ubi/gluebi.o

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests