Index: pgcl-2.6.5-mm6/include/asm-generic/rmap.h
===================================================================
--- pgcl-2.6.5-mm6.orig/include/asm-generic/rmap.h	2004-04-03 19:37:24.000000000 -0800
+++ pgcl-2.6.5-mm6/include/asm-generic/rmap.h	2004-04-16 12:21:18.000000000 -0700
@@ -57,7 +57,8 @@
 {
 	struct page * page = kmap_atomic_to_page(ptep);
 	unsigned long low_bits;
-	low_bits = ((unsigned long)ptep & ~PAGE_MASK) * PTRS_PER_PTE;
+	low_bits = ((unsigned long)ptep & (PTRS_PER_PTE*sizeof(pte_t) - 1))
+			* (PAGE_SIZE/sizeof(pte_t));
 	return page->index + low_bits;
 }