[cxl:for-6.5/dcd-preview 13/15] loongarch64-linux-ld: region.c:undefined reference to `unregister_dax_mapping'

[kernel test robot <lkp@intel.com>]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git for-6.5/dcd-preview
head:   f425bc34c600e2a3721d6560202962ec41622815
commit: 3113a430f1ccbad8340234cf38b00f271ccee103 [13/15] cxl/mem: Add support to handle DCD add and release capacity events.
config: loongarch-randconfig-r032-20230409 (https://download.01.org/0day-ci/archive/20230409/202304091902.giibV6MQ-lkp@intel.com/config)
compiler: loongarch64-linux-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=3113a430f1ccbad8340234cf38b00f271ccee103
        git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl for-6.5/dcd-preview
        git checkout 3113a430f1ccbad8340234cf38b00f271ccee103
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 make.cross W=1 O=build_dir ARCH=loongarch SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>
| Link: https://lore.kernel.org/oe-kbuild-all/202304091902.giibV6MQ-lkp@intel.com/

All errors (new ones prefixed by >>):

   loongarch64-linux-ld: loongarch64-linux-ld: DWARF error: could not find abbrev number 35
   drivers/cxl/core/region.o: in function `.LVL1562':
   region.c:(.text+0x43e8): undefined reference to `unregister_dax_mapping'
>> loongarch64-linux-ld: region.c:(.text+0x43ec): undefined reference to `unregister_dax_mapping'
>> loongarch64-linux-ld: region.c:(.text+0x43ec): undefined reference to `unregister_dax_mapping'
   loongarch64-linux-ld: drivers/cxl/core/region.o: in function `.LVL1563':
>> region.c:(.text+0x43f8): undefined reference to `unregister_dev_dax'
>> loongarch64-linux-ld: region.c:(.text+0x43fc): undefined reference to `unregister_dev_dax'
>> loongarch64-linux-ld: region.c:(.text+0x43fc): undefined reference to `unregister_dev_dax'
   loongarch64-linux-ld: drivers/cxl/core/region.o: in function `.LVL1581':
   region.c:(.text+0x44f0): undefined reference to `devm_create_dev_dax'
   loongarch64-linux-ld: drivers/cxl/core/region.o: in function `.LVL1590':
>> region.c:(.text+0x4574): undefined reference to `alloc_dev_dax_range'

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