Hi Shaohua,

[auto build test ERROR on driver-core/driver-core-testing]
[also build test ERROR on v4.12-rc3 next-20170602]
[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/Shaohua-Li/kernfs-implement-i_generation/20170603-083132
config: x86_64-randconfig-x015-201722 (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=x86_64 

All error/warnings (new ones prefixed by >>):

   block/blk-throttle.c: In function 'throtl_schedule_pending_timer':
>> block/blk-throttle.c:355:3: error: implicit declaration of function 'blk_add_cgroup_trace_msg' [-Werror=implicit-function-declaration]
      blk_add_cgroup_trace_msg(__td->queue,   \
      ^
>> block/blk-throttle.c:697:2: note: in expansion of macro 'throtl_log'
     throtl_log(sq, "schedule timer. delay=%lu jiffies=%lu",
     ^~~~~~~~~~
   cc1: some warnings being treated as errors

vim +/blk_add_cgroup_trace_msg +355 block/blk-throttle.c

   349		struct throtl_data *__td = sq_to_td((sq));			\
   350										\
   351		(void)__td;							\
   352		if (likely(!blk_trace_note_message_enabled(__td->queue)))	\
   353			break;							\
   354		if ((__tg)) {							\
 > 355			blk_add_cgroup_trace_msg(__td->queue,			\
   356				tg_to_blkg(__tg)->blkcg, "throtl " fmt, ##args);\
   357		} else {							\
   358			blk_add_trace_msg(__td->queue, "throtl " fmt, ##args);	\

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