[PATCH] convert hugetlb code to use compound pages
The odd thing about hugetlb is that it maintains its own freelist of pages. And it has to do that, else it would trivially run out of pages due to buddy fragmetation. So we we don't want callers of put_page() to be passing those pages to __free_pages_ok() on the final put(). So hugetlb installs a destructor in the compound pages to point at free_huge_page(), which knows how to put these pages back onto the free list. Also, don't mark hugepages as all PageReserved any more. That's preenting callers from doing proper refcounting. Any code which does a user pagetable walk and hits part of a hugepage will now handle it transparently.
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