[rcu:rcu/dev 5/99] main.c:undefined reference to `rcu_cpu_starting'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/dev
head:   477fc1978395d58ae0406293a1d963629778a39d
commit: 354238a30982b817262fe6f9d00f808451694366 [5/99] rcu/x86: Provide early rcu_cpu_starting() callback
config: i386-alldefconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 354238a30982b817262fe6f9d00f808451694366
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   arch/x86/kernel/cpu/mtrr/main.o: In function `mtrr_ap_init':
>> main.c:(.text+0x94c): undefined reference to `rcu_cpu_starting'

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