Hi Stephen,

[auto build test ERROR on block/for-next -- 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-manual-merge-of-the-akpm-current-tree-with-the-block-tree/20151101-235406
config: x86_64-randconfig-x019-201544 (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   block/blk-core.c: In function 'blk_queue_enter':
>> block/blk-core.c:641:8: error: implicit declaration of function 'gfpflags_allow_blocking' [-Werror=implicit-function-declaration]
      if (!gfpflags_allow_blocking(gfp))
           ^
   In file included from include/linux/linkage.h:4:0,
                    from include/linux/kernel.h:6,
                    from block/blk-core.c:14:
   block/blk-core.c: In function 'generic_make_request':
>> block/blk-core.c:2041:33: error: '__GFP_RECLAIM' undeclared (first use in this function)
      if (likely(blk_queue_enter(q, __GFP_RECLAIM) == 0)) {
                                    ^
   include/linux/compiler.h:165:40: note: in definition of macro 'likely'
    # define likely(x) __builtin_expect(!!(x), 1)
                                           ^
   block/blk-core.c:2041:33: note: each undeclared identifier is reported only once for each function it appears in
      if (likely(blk_queue_enter(q, __GFP_RECLAIM) == 0)) {
                                    ^
   include/linux/compiler.h:165:40: note: in definition of macro 'likely'
    # define likely(x) __builtin_expect(!!(x), 1)
                                           ^
   cc1: some warnings being treated as errors

vim +/gfpflags_allow_blocking +641 block/blk-core.c

   635		while (true) {
   636			int ret;
   637	
   638			if (percpu_ref_tryget_live(&q->q_usage_counter))
   639				return 0;
   640	
 > 641			if (!gfpflags_allow_blocking(gfp))
   642				return -EBUSY;
   643	
   644			ret = wait_event_interruptible(q->mq_freeze_wq,

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