[rcu:dev.2020.11.15a 38/47] ERROR: modpost: "poll_state_synchronize_srcu" undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.11.15a
head:   0cbf40a040eee93f0060e7eebac98c91ef6af021
commit: 7d879f439ed440baf02e676a784e8fa68ca87109 [38/47] rcutorture: Add writer-side tests of polling grace-period API
config: x86_64-randconfig-a013-20201116 (attached as .config)
compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project c044709b8fbea2a9a375e4173a6bd735f6866c0c)
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
        # install x86_64 cross compiling tool for clang build
        # apt-get install binutils-x86-64-linux-gnu
        # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=7d879f439ed440baf02e676a784e8fa68ca87109
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu dev.2020.11.15a
        git checkout 7d879f439ed440baf02e676a784e8fa68ca87109
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 

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

Note: the rcu/dev.2020.11.15a HEAD 0cbf40a040eee93f0060e7eebac98c91ef6af021 builds fine.
      It only hurts bisectibility.

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

>> ERROR: modpost: "poll_state_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined!
>> ERROR: modpost: "start_poll_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined!
>> ERROR: modpost: "get_state_synchronize_srcu" [kernel/rcu/rcutorture.ko] undefined!

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

Attachment: .config.gz
Description: application/gzip