[rcu:dev 110/110] kernel/softirq.c:298: undefined reference to `rcu_softirq_qs'

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev
head:   0028a1e4fdbb4263539595da08979d59954d4873
commit: 0028a1e4fdbb4263539595da08979d59954d4873 [110/110] rcu: Apply RCU-bh QSes to RCU-sched and RCU-preempt when safe
config: x86_64-randconfig-i0-201825 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        git checkout 0028a1e4fdbb4263539595da08979d59954d4873
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   kernel/softirq.o: In function `__do_softirq':
>> kernel/softirq.c:298: undefined reference to `rcu_softirq_qs'

vim +298 kernel/softirq.c

   240	
   241	asmlinkage __visible void __softirq_entry __do_softirq(void)
   242	{
   243		unsigned long end = jiffies + MAX_SOFTIRQ_TIME;
   244		unsigned long old_flags = current->flags;
   245		int max_restart = MAX_SOFTIRQ_RESTART;
   246		struct softirq_action *h;
   247		bool in_hardirq;
   248		__u32 pending;
   249		int softirq_bit;
   250	
   251		/*
   252		 * Mask out PF_MEMALLOC s current task context is borrowed for the
   253		 * softirq. A softirq handled such as network RX might set PF_MEMALLOC
   254		 * again if the socket is related to swap
   255		 */
   256		current->flags &= ~PF_MEMALLOC;
   257	
   258		pending = local_softirq_pending();
   259		account_irq_enter_time(current);
   260	
   261		__local_bh_disable_ip(_RET_IP_, SOFTIRQ_OFFSET);
   262		in_hardirq = lockdep_softirq_start();
   263	
   264	restart:
   265		/* Reset the pending bitmask before enabling irqs */
   266		set_softirq_pending(0);
   267	
   268		local_irq_enable();
   269	
   270		h = softirq_vec;
   271	
   272		while ((softirq_bit = ffs(pending))) {
   273			unsigned int vec_nr;
   274			int prev_count;
   275	
   276			h += softirq_bit - 1;
   277	
   278			vec_nr = h - softirq_vec;
   279			prev_count = preempt_count();
   280	
   281			kstat_incr_softirqs_this_cpu(vec_nr);
   282	
   283			trace_softirq_entry(vec_nr);
   284			h->action(h);
   285			trace_softirq_exit(vec_nr);
   286			if (unlikely(prev_count != preempt_count())) {
   287				pr_err("huh, entered softirq %u %s %p with preempt_count %08x, exited with %08x?\n",
   288				       vec_nr, softirq_to_name[vec_nr], h->action,
   289				       prev_count, preempt_count());
   290				preempt_count_set(prev_count);
   291			}
   292			h++;
   293			pending >>= softirq_bit;
   294		}
   295	
   296		rcu_bh_qs();
   297		if (__this_cpu_read(ksoftirqd) == current)
 > 298			rcu_softirq_qs();
   299		local_irq_disable();
   300	
   301		pending = local_softirq_pending();
   302		if (pending) {
   303			if (time_before(jiffies, end) && !need_resched() &&
   304			    --max_restart)
   305				goto restart;
   306	
   307			wakeup_softirqd();
   308		}
   309	
   310		lockdep_softirq_end(in_hardirq);
   311		account_irq_exit_time(current);
   312		__local_bh_enable(SOFTIRQ_OFFSET);
   313		WARN_ON_ONCE(in_interrupt());
   314		current_restore_flags(old_flags, PF_MEMALLOC);
   315	}
   316	

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