[rcu:ms 7/7] ERROR: "percpu_downgrade_write" [drivers/misc/sgi-gru/gru.ko] undefined!

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git ms
head:   7daa984159c77d85f3ee053d5688ed7a47854613
commit: 7daa984159c77d85f3ee053d5688ed7a47854613 [7/7] mmap_sem: Use percpu_rw_sema
config: x86_64-rhel (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout 7daa984159c77d85f3ee053d5688ed7a47854613
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

>> ERROR: "percpu_downgrade_write" [drivers/misc/sgi-gru/gru.ko] undefined!

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