Hi Peter,

[auto build test ERROR on v4.3-rc4 -- if it's inappropriate base, please ignore]

config: i386-randconfig-x004-201540 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   kernel/rcu/tree.c: In function '_raw_spin_lock_irqsave_rcu_node':
>> kernel/rcu/tree.c:1488:2: error: too many arguments to function '_raw_spin_lock_irqsave'
     _raw_spin_lock_irqsave(&rnp->lock, flags);
     ^
   In file included from include/linux/spinlock.h:280:0,
                    from kernel/rcu/tree.c:33:
   include/linux/spinlock_api_smp.h:34:26: note: declared here
    unsigned long __lockfunc _raw_spin_lock_irqsave(raw_spinlock_t *lock)
                             ^
   kernel/rcu/tree.c: At top level:
>> kernel/rcu/tree.c:1493:34: error: expected declaration specifiers or '...' before '(' token
     _raw_spin_lock_irqsave_rcu_node((rnp), &(flags))
                                     ^
>> kernel/rcu/tree.c:1493:41: error: expected declaration specifiers or '...' before '&' token
     _raw_spin_lock_irqsave_rcu_node((rnp), &(flags))
                                            ^
   kernel/rcu/tree.c: In function 'note_gp_changes':
>> kernel/rcu/tree.c:1807:7: error: implicit declaration of function 'raw_spin_trylock_rcu_node' [-Werror=implicit-function-declaration]
         !raw_spin_trylock_rcu_node(rnp)) { /* irqs already off, so later. */
          ^
   cc1: some warnings being treated as errors

vim +/_raw_spin_lock_irqsave +1488 kernel/rcu/tree.c

  1482		smp_mb__after_unlock_lock();
  1483	}
  1484	
  1485	static inline void
  1486	_raw_spin_lock_irqsave_rcu_node(struct rcu_node *rnp, unsigned long *flags)
  1487	{
> 1488		_raw_spin_lock_irqsave(&rnp->lock, flags);
  1489		smp_mb__after_unlock_lock();
  1490	}
  1491	
  1492	#define raw_spin_lock_irqsave_rcu_node(rnp, flags)
> 1493		_raw_spin_lock_irqsave_rcu_node((rnp), &(flags))
  1494	
  1495	static inline bool raw_spin_trylock_rcu_node(struct rcu_node *rnp)
  1496	{

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