[rcu:dev.2020.12.15b 128/134] ERROR: modpost: "rcu_nocb_cpu_deoffload" undefined!

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2020.12.15b
head:   f895a17eec290b0038a6294d884a9cc92d7d6e80
commit: 892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa [128/134] rcutorture: Test runtime toggling of CPUs' callback offloading
config: x86_64-rhel (attached as .config)
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa
        git remote add rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
        git fetch --no-tags rcu dev.2020.12.15b
        git checkout 892f898ac8cfffe89e3c7fd483c8eaf71b3f12aa
        # save the attached .config to linux build tree
        make W=1 ARCH=x86_64 

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

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

>> ERROR: modpost: "rcu_nocb_cpu_deoffload" [kernel/rcu/rcutorture.ko] undefined!

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Attachment: .config.gz
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