tree:   https://github.com/ammarfaizi2/linux-block tj/cgroup/for-next
head:   6ab428604f724cf217a47b7d3f3353aab815b40e
commit: 6ab428604f724cf217a47b7d3f3353aab815b40e [8/8] cgroup: Implement DEBUG_CGROUP_REF
config: powerpc-allmodconfig
compiler: powerpc-linux-gcc (GCC) 12.1.0
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/ammarfaizi2/linux-block/commit/6ab428604f724cf217a47b7d3f3353aab815b40e
        git remote add ammarfaizi2-block https://github.com/ammarfaizi2/linux-block
        git fetch --no-tags ammarfaizi2-block tj/cgroup/for-next
        git checkout 6ab428604f724cf217a47b7d3f3353aab815b40e
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-12.1.0 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@intel.com>

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

>> ERROR: modpost: "css_put" [fs/btrfs/btrfs.ko] undefined!
>> ERROR: modpost: "css_get" [fs/btrfs/btrfs.ko] undefined!
>> ERROR: modpost: "css_put" [drivers/block/loop.ko] undefined!
>> ERROR: modpost: "css_get" [drivers/block/loop.ko] undefined!
>> ERROR: modpost: "css_put" [net/netfilter/xt_cgroup.ko] undefined!

-- 
0-DAY CI Kernel Test Service
https://01.org/lkp