A few tiny, cosmetic comments on the patch itself:

 }
 
+
+
+
 #endif         /* CONFIG_HUGETLB_PAGE */
 

Be careful about adding whitespace like that

 /*
+ *     indicates page's order in freelist
+ *      order is recorded in inveterd manner.
+ */

The comments around there tend to use a space instead of a tab in
comments like this:
/*
 * foo
 */

patch 2:

                area = zone->free_area + current_order;
                if (list_empty(&area->free_list))
                        continue;
-
                page = list_entry(area->free_list.next, struct page, lru);
                list_del(&page->lru);

More whitespace .

-- Dave

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