Hi Peter,

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

config: x86_64-randconfig-x010-201540 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All warnings (new ones prefixed by >>):

   In file included from include/linux/kernel.h:12:0,
                    from kernel/rcu/tree.c:31:
   kernel/rcu/tree.c: In function '_raw_spin_lock_irqsave_rcu_node':
   include/linux/typecheck.h:11:18: warning: comparison of distinct pointer types lacks a cast
     (void)(&__dummy == &__dummy2); \
                     ^
>> include/linux/irqflags.h:63:3: note: in expansion of macro 'typecheck'
      typecheck(unsigned long, flags); \
      ^
>> include/linux/irqflags.h:95:3: note: in expansion of macro 'raw_local_irq_save'
      raw_local_irq_save(flags);  \
      ^
>> include/linux/spinlock_api_up.h:40:8: note: in expansion of macro 'local_irq_save'
      do { local_irq_save(flags); __LOCK(lock); } while (0)
           ^
>> include/linux/spinlock_api_up.h:69:45: note: in expansion of macro '__LOCK_IRQSAVE'
    #define _raw_spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
                                                ^
>> kernel/rcu/tree.c:1488:2: note: in expansion of macro '_raw_spin_lock_irqsave'
     _raw_spin_lock_irqsave(&rnp->lock, flags);
     ^
   In file included from arch/x86/include/asm/processor.h:32:0,
                    from arch/x86/include/asm/thread_info.h:52,
                    from include/linux/thread_info.h:54,
                    from arch/x86/include/asm/preempt.h:6,
                    from include/linux/preempt.h:64,
                    from include/linux/spinlock.h:50,
                    from kernel/rcu/tree.c:33:
>> include/linux/irqflags.h:64:9: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
      flags = arch_local_irq_save();  \
            ^
>> include/linux/irqflags.h:95:3: note: in expansion of macro 'raw_local_irq_save'
      raw_local_irq_save(flags);  \
      ^
>> include/linux/spinlock_api_up.h:40:8: note: in expansion of macro 'local_irq_save'
      do { local_irq_save(flags); __LOCK(lock); } while (0)
           ^
>> include/linux/spinlock_api_up.h:69:45: note: in expansion of macro '__LOCK_IRQSAVE'
    #define _raw_spin_lock_irqsave(lock, flags) __LOCK_IRQSAVE(lock, flags)
                                                ^
>> kernel/rcu/tree.c:1488:2: note: in expansion of macro '_raw_spin_lock_irqsave'
     _raw_spin_lock_irqsave(&rnp->lock, flags);
     ^
   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

  1472	 */
  1473	static inline void raw_spin_lock_rcu_node(struct rcu_node *rnp)
  1474	{
  1475		raw_spin_lock(&rnp->lock);
  1476		smp_mb__after_unlock_lock();
  1477	}
  1478	
  1479	static inline void raw_spin_lock_irq_rcu_node(struct rcu_node *rnp)
  1480	{
  1481		raw_spin_lock_irq(&rnp->lock);
  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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