[cxl:preview 42/49] powerpc-linux-ld: port.c:undefined reference to `cxl_region_rwsem'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git preview
head:   b2d4fd5c97b59f622e6c45ac51020cdcd66bb022
commit: 26b65f41272efb6f9c691f56f02fe4159985d187 [42/49] cxl/region: Enable the assignment of endpoint decoders to regions
config: powerpc-randconfig-r031-20220622 (https://download.01.org/0day-ci/archive/20220623/202206231854.MotF9Vjs-lkp@xxxxxxxxx/config)
compiler: powerpc-linux-gcc (GCC) 11.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=26b65f41272efb6f9c691f56f02fe4159985d187
        git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl preview
        git checkout 26b65f41272efb6f9c691f56f02fe4159985d187
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=powerpc SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   powerpc-linux-ld: drivers/cxl/core/port.o: in function `cxl_root_decoder_visible':
   port.c:(.text+0xe2): undefined reference to `dev_attr_create_pmem_region'
   powerpc-linux-ld: port.c:(.text+0xe6): undefined reference to `dev_attr_create_pmem_region'
   powerpc-linux-ld: port.c:(.text+0xf6): undefined reference to `dev_attr_delete_region'
   powerpc-linux-ld: port.c:(.text+0xfa): undefined reference to `dev_attr_delete_region'
   powerpc-linux-ld: drivers/cxl/core/port.o: in function `cxld_unregister':
   port.c:(.text+0x8ea): undefined reference to `cxl_region_rwsem'
>> powerpc-linux-ld: port.c:(.text+0x8f2): undefined reference to `cxl_region_rwsem'
>> powerpc-linux-ld: port.c:(.text+0x90c): undefined reference to `cxl_region_detach'
   powerpc-linux-ld: drivers/cxl/core/port.o: in function `region_show':
   port.c:(.text+0x1c46): undefined reference to `cxl_region_rwsem'
   powerpc-linux-ld: port.c:(.text+0x1c4a): undefined reference to `cxl_region_rwsem'
   powerpc-linux-ld: drivers/cxl/core/port.o: in function `cxl_decoder_autoremove':
   port.c:(.text+0x388e): undefined reference to `cxl_region_rwsem'
   powerpc-linux-ld: port.c:(.text+0x3892): undefined reference to `cxl_region_rwsem'
   powerpc-linux-ld: port.c:(.text+0x38a8): undefined reference to `cxl_region_detach'
   powerpc-linux-ld: drivers/cxl/core/port.o:(.data+0x130): undefined reference to `dev_attr_create_pmem_region'
   powerpc-linux-ld: drivers/cxl/core/port.o:(.data+0x134): undefined reference to `dev_attr_delete_region'

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