hugepage patches

[Andrew Morton <akpm@digeo.com>]

Gentlemen, I have a bunch of patches here which fix various bugs in the
interaction between hugepages and other kernel functions.

The main impact on hugetlbpage impementations is:

- hugepages are no longer PG_reserved

- hugepages must be page_cache_got in the follow_page() function

- need to implement either hugepage_vma()/follow_huge_addr() or
  pmd_huge()/follow_huge_pmd(), depending on whether a page's hugeness can be
  determined via pmd inspection.  Implementations of both schemes for ia32
  are here.

The code is not heavily tested or reviewed at this time.


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