[rcu:rcu/next 34/34] include/linux/rcupdate.h:426:6: error: 'rcu_scheduler_active' undeclared

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git rcu/next
head:   ccc0666e2049e5818c236e647cf20c552a7b053b
commit: ccc0666e2049e5818c236e647cf20c552a7b053b [34/34] rcu: Allow boot-time use of cond_resched_rcu_qs()
config: i386-randconfig-x008-201648 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        git checkout ccc0666e2049e5818c236e647cf20c552a7b053b
        # save the attached .config to linux build tree
        make ARCH=i386 

All error/warnings (new ones prefixed by >>):

   In file included from include/linux/srcu.h:33:0,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:777,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from mm/page_alloc.c:18:
   mm/page_alloc.c: In function '__alloc_pages_nodemask':
>> include/linux/rcupdate.h:426:6: error: 'rcu_scheduler_active' undeclared (first use in this function)
     if (rcu_scheduler_active && !cond_resched()) \
         ^
>> mm/page_alloc.c:3746:2: note: in expansion of macro 'cond_resched_rcu_qs'
     cond_resched_rcu_qs();
     ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:426:6: note: each undeclared identifier is reported only once for each function it appears in
     if (rcu_scheduler_active && !cond_resched()) \
         ^
>> mm/page_alloc.c:3746:2: note: in expansion of macro 'cond_resched_rcu_qs'
     cond_resched_rcu_qs();
     ^~~~~~~~~~~~~~~~~~~
--
   In file included from include/linux/srcu.h:33:0,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:777,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from mm/vmscan.c:16:
   mm/vmscan.c: In function 'shrink_node_memcg':
>> include/linux/rcupdate.h:426:6: error: 'rcu_scheduler_active' undeclared (first use in this function)
     if (rcu_scheduler_active && !cond_resched()) \
         ^
>> mm/vmscan.c:2355:4: note: in expansion of macro 'cond_resched_rcu_qs'
       cond_resched_rcu_qs();
       ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:426:6: note: each undeclared identifier is reported only once for each function it appears in
     if (rcu_scheduler_active && !cond_resched()) \
         ^
>> mm/vmscan.c:2355:4: note: in expansion of macro 'cond_resched_rcu_qs'
       cond_resched_rcu_qs();
       ^~~~~~~~~~~~~~~~~~~
   mm/vmscan.c: In function 'shrink_node':
>> include/linux/rcupdate.h:426:6: error: 'rcu_scheduler_active' undeclared (first use in this function)
     if (rcu_scheduler_active && !cond_resched()) \
         ^
   mm/vmscan.c:2535:6: note: in expansion of macro 'cond_resched_rcu_qs'
         cond_resched_rcu_qs();
         ^~~~~~~~~~~~~~~~~~~
--
   In file included from include/linux/srcu.h:33:0,
                    from include/linux/notifier.h:15,
                    from include/linux/memory_hotplug.h:6,
                    from include/linux/mmzone.h:777,
                    from include/linux/gfp.h:5,
                    from include/linux/mm.h:9,
                    from include/linux/mman.h:4,
                    from mm/mlock.c:9:
   mm/mlock.c: In function 'apply_mlockall_flags':
>> include/linux/rcupdate.h:426:6: error: 'rcu_scheduler_active' undeclared (first use in this function)
     if (rcu_scheduler_active && !cond_resched()) \
         ^
   mm/mlock.c:782:3: note: in expansion of macro 'cond_resched_rcu_qs'
      cond_resched_rcu_qs();
      ^~~~~~~~~~~~~~~~~~~
   include/linux/rcupdate.h:426:6: note: each undeclared identifier is reported only once for each function it appears in
     if (rcu_scheduler_active && !cond_resched()) \
         ^
   mm/mlock.c:782:3: note: in expansion of macro 'cond_resched_rcu_qs'
      cond_resched_rcu_qs();
      ^~~~~~~~~~~~~~~~~~~

vim +/rcu_scheduler_active +426 include/linux/rcupdate.h

   420	 * This macro resembles cond_resched(), except that it is defined to
   421	 * report potential quiescent states to RCU-tasks even if the cond_resched()
   422	 * machinery were to be shut off, as some advocate for PREEMPT kernels.
   423	 */
   424	#define cond_resched_rcu_qs() \
   425	do { \
 > 426		if (rcu_scheduler_active && !cond_resched()) \
   427			rcu_note_voluntary_context_switch(current); \
   428	} while (0)
   429	

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