Index: linux-2.6/mm/slub.c
===================================================================
--- linux-2.6.orig/mm/slub.c	2007-07-02 17:04:36.000000000 -0700
+++ linux-2.6/mm/slub.c	2007-07-03 08:39:19.000000000 -0700
@@ -101,6 +101,8 @@
 
 #define FROZEN (1 << PG_active)
 
+#define LOCKLESS (1 << PG_writeback)
+
 #ifdef CONFIG_SLUB_DEBUG
 #define SLABDEBUG (1 << PG_error)
 #else
@@ -122,6 +124,21 @@
 	page->flags &= ~FROZEN;
 }
 
+static inline int SlabLockless(struct page *page)
+{
+	return page->flags & LOCKLESS;
+}
+
+static inline void SetSlabLockless(struct page *page)
+{
+	page->flags |= LOCKLESS;
+}
+
+static inline void ClearSlabLockless(struct page *page)
+{
+	page->flags &= ~LOCKLESS;
+}
+
 static inline int SlabDebug(struct page *page)
 {
 	return page->flags & SLABDEBUG;