[congwang:sch_bpf 2/2] ERROR: modpost: "qdisc_lookup_rcu" [net/sched/sch_bpf.ko] undefined!

[kernel test robot]

tree:   https://github.com/congwang/linux.git sch_bpf
head:   b03bbda26c041cf6e7593eadce50ef2fa4853a0c
commit: b03bbda26c041cf6e7593eadce50ef2fa4853a0c [2/2] net_sched: introduce eBPF based Qdisc
config: m68k-allmodconfig (https://download.01.org/0day-ci/archive/20220521/202205211231.rVPE9dhv-lkp@xxxxxxxxx/config)
compiler: m68k-linux-gcc (GCC) 11.3.0
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/congwang/linux/commit/b03bbda26c041cf6e7593eadce50ef2fa4853a0c
        git remote add congwang https://github.com/congwang/linux.git
        git fetch --no-tags congwang sch_bpf
        git checkout b03bbda26c041cf6e7593eadce50ef2fa4853a0c
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=m68k SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>

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

>> ERROR: modpost: "qdisc_lookup_rcu" [net/sched/sch_bpf.ko] undefined!

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