[rcu:dev.2019.08.01b 66/72] kernel/rcu/rcutorture.c:1767:4: error: implicit declaration of function 'rcu_momentary_dyntick_idle'

[kbuild test robot]

tree:   https://kernel.googlesource.com/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2019.08.01b
head:   6c92be8b1b81158f48ab0cb00d34d451dae1fa3c
commit: 5f4264e33ca4e7cee035cee5bfa62f6d1bbf2cda [66/72] rcutorture: Emulate dyntick aspect of userspace nohz_full sojourn
config: i386-randconfig-d004-201931 (attached as .config)
compiler: gcc-7 (Debian 7.4.0-10) 7.4.0
reproduce:
        git checkout 5f4264e33ca4e7cee035cee5bfa62f6d1bbf2cda
        # save the attached .config to linux build tree
        make ARCH=i386 

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

All errors (new ones prefixed by >>):

   kernel/rcu/rcutorture.c: In function 'rcu_torture_fwd_prog_cbfree':
>> kernel/rcu/rcutorture.c:1767:4: error: implicit declaration of function 'rcu_momentary_dyntick_idle' [-Werror=implicit-function-declaration]
       rcu_momentary_dyntick_idle();
       ^~~~~~~~~~~~~~~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/rcu_momentary_dyntick_idle +1767 kernel/rcu/rcutorture.c

  1741	
  1742	/*
  1743	 * Free all callbacks on the rcu_fwd_cb_head list, either because the
  1744	 * test is over or because we hit an OOM event.
  1745	 */
  1746	static unsigned long rcu_torture_fwd_prog_cbfree(void)
  1747	{
  1748		unsigned long flags;
  1749		unsigned long freed = 0;
  1750		struct rcu_fwd_cb *rfcp;
  1751	
  1752		for (;;) {
  1753			spin_lock_irqsave(&rcu_fwd_lock, flags);
  1754			rfcp = rcu_fwd_cb_head;
  1755			if (!rfcp) {
  1756				spin_unlock_irqrestore(&rcu_fwd_lock, flags);
  1757				break;
  1758			}
  1759			rcu_fwd_cb_head = rfcp->rfc_next;
  1760			if (!rcu_fwd_cb_head)
  1761				rcu_fwd_cb_tail = &rcu_fwd_cb_head;
  1762			spin_unlock_irqrestore(&rcu_fwd_lock, flags);
  1763			kfree(rfcp);
  1764			freed++;
  1765			rcu_torture_fwd_prog_cond_resched(freed);
  1766			if (IS_ENABLED(CONFIG_NO_HZ_FULL))
> 1767				rcu_momentary_dyntick_idle();
  1768		}
  1769		return freed;
  1770	}
  1771	

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