tree:   git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
head:   8a896813a328f23aeee5f56d3139361534796636
commit: 64aa967f459ba0bb91ea8b127c9bd586db1beabc [114/486] pagemap: redefine callback functions for page table walker
config: x86_64-randconfig-br2-03311043 (attached as .config)

Note: the next/master HEAD 8a896813a328f23aeee5f56d3139361534796636 builds fine.
      It only hurts bisectibility.

All error/warnings:

   fs/proc/task_mmu.c: In function 'pagemap_read':
>> fs/proc/task_mmu.c:1120:31: error: 'pagemap_hugetlb' undeclared (first use in this function)
     pagemap_walk.hugetlb_entry = pagemap_hugetlb;
                                  ^
   fs/proc/task_mmu.c:1120:31: note: each undeclared identifier is reported only once for each function it appears in
   fs/proc/task_mmu.c: At top level:
   fs/proc/task_mmu.c:1025:12: warning: 'pagemap_hugetlb_range' defined but not used [-Wunused-function]
    static int pagemap_hugetlb_range(pte_t *pte, unsigned long hmask,
               ^

vim +/pagemap_hugetlb +1120 fs/proc/task_mmu.c

  1114			goto out_free;
  1115	
  1116		pagemap_walk.pte_entry = pagemap_pte;
  1117		pagemap_walk.pmd_entry = pagemap_pmd;
  1118		pagemap_walk.pte_hole = pagemap_pte_hole;
  1119	#ifdef CONFIG_HUGETLB_PAGE
> 1120		pagemap_walk.hugetlb_entry = pagemap_hugetlb;
  1121	#endif
  1122		pagemap_walk.mm = mm;
  1123		pagemap_walk.private = ±

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