[rcu:rcu/dev 5/99] arch/x86/kernel/cpu/mtrr/main.c:797: 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-randconfig-i1-201820 (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':
>> arch/x86/kernel/cpu/mtrr/main.c:797: undefined reference to `rcu_cpu_starting'

vim +797 arch/x86/kernel/cpu/mtrr/main.c

   788	
   789	void mtrr_ap_init(void)
   790	{
   791		if (!mtrr_enabled())
   792			return;
   793	
   794		if (!use_intel() || mtrr_aps_delayed_init)
   795			return;
   796	
 > 797		rcu_cpu_starting(smp_processor_id());
   798	
   799		/*
   800		 * Ideally we should hold mtrr_mutex here to avoid mtrr entries
   801		 * changed, but this routine will be called in cpu boot time,
   802		 * holding the lock breaks it.
   803		 *
   804		 * This routine is called in two cases:
   805		 *
   806		 *   1. very earily time of software resume, when there absolutely
   807		 *      isn't mtrr entry changes;
   808		 *
   809		 *   2. cpu hotadd time. We let mtrr_add/del_page hold cpuhotplug
   810		 *      lock to prevent mtrr entry changes
   811		 */
   812		set_mtrr_from_inactive_cpu(~0U, 0, 0, 0);
   813	}
   814	

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