Hi Barry,

I love your patch! Perhaps something to improve:

[auto build test WARNING on driver-core/driver-core-testing]
[also build test WARNING on staging/staging-testing linus/master v5.14-rc4 next-20210805]
[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/20210806-190735
base:   https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core.git 112cedc8e600b668688eb809bf11817adec58ddc
config: xtensa-randconfig-r011-20210805 (attached as .config)
compiler: xtensa-linux-gcc (GCC) 10.3.0
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/cc67b898a0f6f1a93163c0c296cfa77b1f04f72d
        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/20210806-190735
        git checkout cc67b898a0f6f1a93163c0c296cfa77b1f04f72d
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=xtensa SHELL=/bin/bash

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> WARNING: modpost: lib/test_bitmap.o(.text.unlikely+0x58): Section mismatch in reference from the function bitmap_equal() to the variable .init.data:print_buf
The function bitmap_equal() references
the variable __initdata print_buf.
This is often because bitmap_equal lacks a __initdata
annotation or the annotation of print_buf is wrong.

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