Hi Stephen,

[auto build test ERROR on v4.3-rc7 -- if it's inappropriate base, please suggest rules for selecting the more suitable base]

url:    https://github.com/0day-ci/linux/commits/Stephen-Rothwell/linux-next-build-failure-after-merge-of-the-akpm-current-tree/20151102-001657
config: i386-randconfig-x004-11010709 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   drivers/block/nbd.c: In function 'nbd_thread_send':
>> drivers/block/nbd.c:596:3: error: implicit declaration of function 'kernel_dequeue_signal' [-Werror=implicit-function-declaration]
      kernel_dequeue_signal(NULL);
      ^
   cc1: some warnings being treated as errors

vim +/kernel_dequeue_signal +596 drivers/block/nbd.c

   590		spin_lock_irqsave(&nbd->tasks_lock, flags);
   591		nbd->task_send = NULL;
   592		spin_unlock_irqrestore(&nbd->tasks_lock, flags);
   593	
   594		/* Clear maybe pending signals */
   595		if (signal_pending(current))
 > 596			kernel_dequeue_signal(NULL);
   597	
   598		return 0;
   599	}

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