[rcu:rcu/test 138/143] rcutorture.c:(.text.rcu_torture_reader_do_mbchk+0x30): undefined reference to `torture_num_online_cpus'

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/test
head:   4c4c8e04a7f8522de634aa062f4cd6b8b80c151b
commit: cf516f4063cae6b69de6dd734d6c57901d24f112 [138/143] torture: Maintain torture-specific set of CPUs-online books
config: mips-randconfig-r024-20201221 (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/paulmck/linux-rcu.git/commit/?id=cf516f4063cae6b69de6dd734d6c57901d24f112
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu rcu/test
        git checkout cf516f4063cae6b69de6dd734d6c57901d24f112
        # 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@xxxxxxxxx>

All errors (new ones prefixed by >>):

   mipsel-linux-ld: kernel/rcu/rcutorture.o: in function `rcu_torture_reader_do_mbchk':
>> rcutorture.c:(.text.rcu_torture_reader_do_mbchk+0x30): undefined reference to `torture_num_online_cpus'
   mipsel-linux-ld: kernel/rcu/rcutorture.o: in function `rcu_torture_reader':
>> rcutorture.c:(.text.rcu_torture_reader+0x118): undefined reference to `torture_num_online_cpus'

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

Attachment: .config.gz
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