Index: linux-2.6.15-rc2/include/linux/rmap.h
===================================================================
--- linux-2.6.15-rc2.orig/include/linux/rmap.h	2005-11-20 03:25:03.000000000 +0000
+++ linux-2.6.15-rc2/include/linux/rmap.h	2005-11-23 02:14:16.000000000 +0000
@@ -72,7 +72,7 @@ void __anon_vma_link(struct vm_area_stru
  */
 void page_add_anon_rmap(struct page *, struct vm_area_struct *, unsigned long);
 void page_add_file_rmap(struct page *);
-void page_remove_rmap(struct page *);
+void page_remove_rmap(struct zone *, struct page *);
 
 /**
  * page_dup_rmap - duplicate pte mapping to a page
Index: linux-2.6.15-rc2/mm/rmap.c
===================================================================
--- linux-2.6.15-rc2.orig/mm/rmap.c	2005-11-23 01:38:17.000000000 +0000
+++ linux-2.6.15-rc2/mm/rmap.c	2005-11-23 02:13:45.000000000 +0000
@@ -485,7 +485,7 @@ void page_add_file_rmap(struct page *pag
  *
  * The caller needs to hold the pte lock.
  */
-void page_remove_rmap(struct page *page)
+void page_remove_rmap(struct zone *z, struct page *page)
 {
 	if (atomic_add_negative(-1, &page->_mapcount)) {
 		BUG_ON(page_mapcount(page) < 0);
@@ -501,6 +501,7 @@ void page_remove_rmap(struct page *page)
 		if (page_test_and_clear_dirty(page))
 			set_page_dirty(page);
 		dec_page_state(nr_mapped);
+		z->nr_unmapped++;
 	}
 }