tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   7207a315977b07013f25ae9a3c1f8168facb6343
commit: 208a47487f7214b16bef56aac912d26b60a43f9a [122/249] mm: update generic gup implementation to handle hugepage directory
config: arm-omap2plus_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 208a47487f7214b16bef56aac912d26b60a43f9a
  # save the attached .config to linux build tree
  make.cross ARCH=arm 

All warnings:

   In file included from include/linux/mm.h:52:0,
                    from mm/gup.c:7:
>> arch/arm/include/asm/pgtable.h:184:0: warning: "pgd_huge" redefined
    #define pgd_huge(pgd)  (0)
    ^
   In file included from mm/gup.c:6:0:
   include/linux/hugetlb.h:183:0: note: this is the location of the previous definition
    #define pgd_huge(x) 0
    ^
   In file included from include/linux/mm.h:52:0,
                    from mm/gup.c:7:
>> arch/arm/include/asm/pgtable.h:184:0: warning: "pgd_huge" redefined
    #define pgd_huge(pgd)  (0)
    ^
   In file included from mm/gup.c:6:0:
   include/linux/hugetlb.h:183:0: note: this is the location of the previous definition
    #define pgd_huge(x) 0
    ^

vim +/pgd_huge +184 arch/arm/include/asm/pgtable.h

   168	 * for zero-mapped memory areas etc..
   169	 */
   170	extern struct page *empty_zero_page;
   171	#define ZERO_PAGE(vaddr)	(empty_zero_page)
   172	
   173	
   174	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
   175	
   176	/* to find an entry in a page-table-directory */
   177	#define pgd_index(addr)		((addr) >> PGDIR_SHIFT)
   178	
   179	#define pgd_offset(mm, addr)	((mm)->pgd + pgd_index(addr))
   180	
   181	/* to find an entry in a kernel page-table-directory */
   182	#define pgd_offset_k(addr)	pgd_offset(&init_mm, addr)
   183	
 > 184	#define pgd_huge(pgd)		(0)
   185	
   186	#define pmd_none(pmd)		(!pmd_val(pmd))
   187	#define pmd_present(pmd)	(pmd_val(pmd))
   188	
   189	static inline pte_t *pmd_page_vaddr(pmd_t pmd)
   190	{
   191		return __va(pmd_val(pmd) & PHYS_MASK & (s32)PAGE_MASK);
   192	}

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