Hi Barry,

I love your patch! Yet something to improve:

[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on staging/staging-testing linus/master v5.13 next-20210701]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Barry-Song/use-bin_attribute-to-break-the-size-limitation-of-cpumap-ABI/20210702-172727
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 3b1f941536af17537da09a7552c8e74804dd6823
config: parisc-randconfig-r004-20210702 (attached as .config)
compiler: hppa64-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://github.com/0day-ci/linux/commit/647347a6350cefabb7ef767a0ab304be4395eeb2
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Barry-Song/use-bin_attribute-to-break-the-size-limitation-of-cpumap-ABI/20210702-172727
        git checkout 647347a6350cefabb7ef767a0ab304be4395eeb2
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=parisc 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 >>):

   hppa64-linux-ld: drivers/base/topology.o: in function `.LC3':
>> (.data.rel.ro+0x18): undefined reference to `cpumap_print_to_buf'
   hppa64-linux-ld: drivers/base/topology.o: in function `.LC15':
   (.data.rel.ro+0x58): undefined reference to `cpumap_print_to_buf'

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