Hi Ingo,

[auto build test ERROR on linus/master]
[also build test ERROR on v4.9-rc5 next-20161115]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Ingo-Molnar/printk-locking-atomics-kref-Introduce-new-pAr-and-pAk-format-string-options-for-atomic_t-and-struct-kref/20161115-174900
config: i386-randconfig-x006-201646 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   lib/vsprintf.c: In function 'atomic_var':
>> lib/vsprintf.c:1498:10: error: implicit declaration of function 'refcount_read' [-Werror=implicit-function-declaration]
       num = refcount_read(&kref_p->refcount);
             ^~~~~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/refcount_read +1498 lib/vsprintf.c

  1492				break;
  1493			}
  1494			case 'k':
  1495			{
  1496				struct kref *kref_p = (void *)atomic_ptr;
  1497	
> 1498				num = refcount_read(&kref_p->refcount);
  1499				break;
  1500			}
  1501			default:

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