Re: [PATCH 03/10] mm/hugetlb: Protect follow_huge_(pud|pgd) functions from race

On 04/07/2016 03:04 PM, kbuild test robot wrote:

All errors (new ones prefixed by >>):

   mm/hugetlb.c: In function 'follow_huge_pud':

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mm/hugetlb.c:4360:3: error: implicit declaration of function 'pud_page' [-Werror=implicit-function-declaration]

      page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
      ^
   mm/hugetlb.c:4360:8: warning: assignment makes pointer from integer without a cast
      page = pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
           ^
   mm/hugetlb.c: In function 'follow_huge_pgd':
   mm/hugetlb.c:4395:3: error: implicit declaration of function 'pgd_page' [-Werror=implicit-function-declaration]
      page = pgd_page(*pgd) + ((address & ~PGDIR_MASK) >> PAGE_SHIFT);

Both the build errors here are because of the fact that pgd_page() is
not available for some platforms and config options. It got missed as
I ran only powerpc config options for build test purpose. My bad, will
fix it.