tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   fe8eec967fb5db169b876720a6e0cced026173b6
commit: 98abd4910a62da41245a290a82d15ea834824c06 [122/298] lib/ioremap.c: add huge I/O map capability interfaces
config: microblaze-nommu_defconfig (attached as .config)
reproduce:
  wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
  chmod +x ~/bin/make.cross
  git checkout 98abd4910a62da41245a290a82d15ea834824c06
  # save the attached .config to linux build tree
  make.cross ARCH=microblaze 

All error/warnings:

   init/built-in.o: In function `mm_init':
>> init/main.c:488: undefined reference to `ioremap_huge_init'

vim +488 init/main.c

   482		page_ext_init_flatmem();
   483		mem_init();
   484		kmem_cache_init();
   485		percpu_init_late();
   486		pgtable_init();
   487		vmalloc_init();
 > 488		ioremap_huge_init();
   489	}
   490	
   491	asmlinkage __visible void __init start_kernel(void)

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0-DAY kernel test infrastructure                Open Source Technology Center
http://lists.01.org/mailman/listinfo/kbuild                 Intel Corporation