thp: transparent hugepage core

[pandora-kernel.git] / mm / swap.c

diff --git a/mm/swap.c b/mm/swap.c
index e0eeef9..c02f936 100644 (file)
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -479,6 +479,43 @@ void __pagevec_release(struct pagevec *pvec)
 
 EXPORT_SYMBOL(__pagevec_release);
 
+/* used by __split_huge_page_refcount() */
+void lru_add_page_tail(struct zone* zone,
+                      struct page *page, struct page *page_tail)
+{
+       int active;
+       enum lru_list lru;
+       const int file = 0;
+       struct list_head *head;
+
+       VM_BUG_ON(!PageHead(page));
+       VM_BUG_ON(PageCompound(page_tail));
+       VM_BUG_ON(PageLRU(page_tail));
+       VM_BUG_ON(!spin_is_locked(&zone->lru_lock));
+
+       SetPageLRU(page_tail);
+
+       if (page_evictable(page_tail, NULL)) {
+               if (PageActive(page)) {
+                       SetPageActive(page_tail);
+                       active = 1;
+                       lru = LRU_ACTIVE_ANON;
+               } else {
+                       active = 0;
+                       lru = LRU_INACTIVE_ANON;
+               }
+               update_page_reclaim_stat(zone, page_tail, file, active);
+               if (likely(PageLRU(page)))
+                       head = page->lru.prev;
+               else
+                       head = &zone->lru[lru].list;
+               __add_page_to_lru_list(zone, page_tail, lru, head);
+       } else {
+               SetPageUnevictable(page_tail);
+               add_page_to_lru_list(zone, page_tail, LRU_UNEVICTABLE);
+       }
+}
+
 /*
  * Add the passed pages to the LRU, then drop the caller's refcount
  * on them.  Reinitialises the caller's pagevec.