[linux-next:master 4286/6048] pci-epf-ntb.c:undefined reference to `config_group_init_type_name'

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

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tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   59fa6a163ffabc1bf25c5e0e33899e268a96d3cc
commit: 7dc64244f9e90b7b7bd9cd61eeb515a30a4b119a [4286/6048] PCI: endpoint: Add EP function driver to provide NTB functionality
config: mips-randconfig-r006-20210202 (attached as .config)
compiler: mipsel-linux-gcc (GCC) 9.3.0
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/next/linux-next.git/commit/?id=7dc64244f9e90b7b7bd9cd61eeb515a30a4b119a
        git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
        git fetch --no-tags linux-next master
        git checkout 7dc64244f9e90b7b7bd9cd61eeb515a30a4b119a
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=mips 

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 >>):

   mipsel-linux-ld: drivers/pci/endpoint/functions/pci-epf-ntb.o: in function `epf_ntb_add_cfs':
>> pci-epf-ntb.c:(.text+0xaa4): undefined reference to `config_group_init_type_name'

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org

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