mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v2

mm-hugetlbfs-fix-rmapping-for-anonymous-hugepages-with-page_pgoff-v2

- fix wrong shift direction
- introduce page_size_order() and huge_page_size_order()
- move the declaration of PageHuge() to include/linux/hugetlb_inline.h
  to avoid macro definition.

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Sasha Levin <sasha.levin@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>