[cxl:preview 60/60] drivers/cxl/region.c:734: undefined reference to `nvdimm_pmem_region_create'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git preview
head:   41c2d219a2c8e14de644f4e953e0c57402c3e884
commit: 41c2d219a2c8e14de644f4e953e0c57402c3e884 [60/60] cxl/region: Create an nd_region
config: x86_64-randconfig-a001-20220124 (https://download.01.org/0day-ci/archive/20220127/202201271831.cqd50BdJ-lkp(a)intel.com/config)
compiler: gcc-9 (Debian 9.3.0-22) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git/commit/?id=41c2d219a2c8e14de644f4e953e0c57402c3e884
        git remote add cxl https://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl.git
        git fetch --no-tags cxl preview
        git checkout 41c2d219a2c8e14de644f4e953e0c57402c3e884
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 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: drivers/cxl/region.o: in function `connect_to_libnvdimm':
>> drivers/cxl/region.c:734: undefined reference to `nvdimm_pmem_region_create'


vim +734 drivers/cxl/region.c

   693	
   694	static int connect_to_libnvdimm(struct cxl_region *region)
   695	{
   696		struct nd_region_desc ndr_desc;
   697		struct cxl_nvdimm_bridge *nvb;
   698		struct nd_region *ndr;
   699		int rc = 0;
   700	
   701		nvb = cxl_find_nvdimm_bridge(&region->config.targets[0]->dev);
   702		if (!nvb) {
   703			dev_dbg(&region->dev, "Couldn't find nvdimm bridge\n");
   704			return -ENODEV;
   705		}
   706	
   707		device_lock(&nvb->dev);
   708		if (!nvb->nvdimm_bus) {
   709			dev_dbg(&nvb->dev, "Couldn't find nvdimm bridge's bus\n");
   710			rc = -ENXIO;
   711			goto out;
   712		}
   713	
   714		memset(&ndr_desc, 0, sizeof(ndr_desc));
   715	
   716		ndr_desc.res = region->res;
   717	
   718		ndr_desc.numa_node = memory_add_physaddr_to_nid(region->res->start);
   719		ndr_desc.target_node = phys_to_target_node(region->res->start);
   720		if (ndr_desc.numa_node == NUMA_NO_NODE) {
   721			ndr_desc.numa_node =
   722				memory_add_physaddr_to_nid(region->res->start);
   723			dev_info(&region->dev,
   724				 "changing numa node from %d to %d for CXL region %pR",
   725				 NUMA_NO_NODE, ndr_desc.numa_node, region->res);
   726		}
   727		if (ndr_desc.target_node == NUMA_NO_NODE) {
   728			ndr_desc.target_node = ndr_desc.numa_node;
   729			dev_info(&region->dev,
   730				 "changing target node from %d to %d for CXL region %pR",
   731				 NUMA_NO_NODE, ndr_desc.target_node, region->res);
   732		}
   733	
 > 734		ndr = nvdimm_pmem_region_create(nvb->nvdimm_bus, &ndr_desc);
   735		if (IS_ERR(ndr))
   736			rc = PTR_ERR(ndr);
   737		else
   738			dev_set_drvdata(&region->dev, ndr);
   739	
   740	out:
   741		device_unlock(&nvb->dev);
   742		put_device(&nvb->dev);
   743		return rc;
   744	}
   745	

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