[rcu:dev.2017.04.28a 41/45] include/linux/notifier.h:77:21: error: field 'srcu' has incomplete type

[kbuild test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2017.04.28a
head:   1205059ca5d4835e9213ff943ce3a51980718b5d
commit: e01ef0529ed548c1b30206058c2b5eecbbc07998 [41/45] srcu: Make SRCU be once again optional
config: sparc64-allnoconfig (attached as .config)
compiler: sparc64-linux-gnu-gcc (Debian 6.1.1-9) 6.1.1 20160705
reproduce:
        wget https://raw.githubusercontent.com/01org/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        git checkout e01ef0529ed548c1b30206058c2b5eecbbc07998
        # save the attached .config to linux build tree
        make.cross ARCH=sparc64 

All errors (new ones prefixed by >>):

   In file included from include/linux/memory_hotplug.h:6:0,
                    from include/linux/mmzone.h:749,
                    from include/linux/gfp.h:5,
                    from include/linux/kmod.h:22,
                    from include/linux/module.h:13,
                    from init/main.c:16:
>> include/linux/notifier.h:77:21: error: field 'srcu' has incomplete type
     struct srcu_struct srcu;
                        ^~~~

vim +/srcu +77 include/linux/notifier.h

e041c6834 Alan Stern    2006-03-27  61  struct atomic_notifier_head {
e041c6834 Alan Stern    2006-03-27  62  	spinlock_t lock;
374a8e0dc Arnd Bergmann 2010-02-24  63  	struct notifier_block __rcu *head;
e041c6834 Alan Stern    2006-03-27  64  };
e041c6834 Alan Stern    2006-03-27  65  
e041c6834 Alan Stern    2006-03-27  66  struct blocking_notifier_head {
e041c6834 Alan Stern    2006-03-27  67  	struct rw_semaphore rwsem;
374a8e0dc Arnd Bergmann 2010-02-24  68  	struct notifier_block __rcu *head;
e041c6834 Alan Stern    2006-03-27  69  };
e041c6834 Alan Stern    2006-03-27  70  
e041c6834 Alan Stern    2006-03-27  71  struct raw_notifier_head {
374a8e0dc Arnd Bergmann 2010-02-24  72  	struct notifier_block __rcu *head;
e041c6834 Alan Stern    2006-03-27  73  };
e041c6834 Alan Stern    2006-03-27  74  
eabc06940 Alan Stern    2006-10-04  75  struct srcu_notifier_head {
eabc06940 Alan Stern    2006-10-04  76  	struct mutex mutex;
eabc06940 Alan Stern    2006-10-04 @77  	struct srcu_struct srcu;
374a8e0dc Arnd Bergmann 2010-02-24  78  	struct notifier_block __rcu *head;
eabc06940 Alan Stern    2006-10-04  79  };
eabc06940 Alan Stern    2006-10-04  80  
e041c6834 Alan Stern    2006-03-27  81  #define ATOMIC_INIT_NOTIFIER_HEAD(name) do {	\
e041c6834 Alan Stern    2006-03-27  82  		spin_lock_init(&(name)->lock);	\
e041c6834 Alan Stern    2006-03-27  83  		(name)->head = NULL;		\
e041c6834 Alan Stern    2006-03-27  84  	} while (0)
e041c6834 Alan Stern    2006-03-27  85  #define BLOCKING_INIT_NOTIFIER_HEAD(name) do {	\

:::::: The code at line 77 was first introduced by commit
:::::: eabc069401bcf45bcc3f19e643017bf761780aa8 [PATCH] Add SRCU-based notifier chains

:::::: TO: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx>
:::::: CC: Linus Torvalds <torvalds@xxxxxxxxxxx>

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