Index: linux-2.6.21-rc7/mm/slub.c
===================================================================
--- linux-2.6.21-rc7.orig/mm/slub.c	2007-04-23 11:51:45.000000000 -0700
+++ linux-2.6.21-rc7/mm/slub.c	2007-04-23 13:08:09.000000000 -0700
@@ -3297,16 +3297,66 @@ static struct kset_uevent_ops slab_ueven
 
 decl_subsys(slab, &slab_ktype, &slab_uevent_ops);
 
+#define ID_STR_LENGTH 30
+
+/* Create a unique string id for a slab cache:
+ * format
+ * :[flags-]size:[memory address of kmemcache]
+ */
+static char *create_unique_id(struct kmem_cache *s)
+{
+	char *name = kmalloc(ID_STR_LENGTH, GFP_KERNEL);
+	char *p = name;
+
+	BUG_ON(!name);
+
+	*p++ = ':';
+	/*
+	 * First flags affecting slabcache operations */
+	if (s->flags & SLAB_CACHE_DMA)
+		*p++ = 'd';
+	if (s->flags & SLAB_RECLAIM_ACCOUNT)
+		*p++ = 'a';
+	if (s->flags & SLAB_DESTROY_BY_RCU)
+		*p++ = 'r';\
+	/* Debug flags */
+	if (s->flags & SLAB_RED_ZONE)
+		*p++ = 'Z';
+	if (s->flags & SLAB_POISON)
+		*p++ = 'P';
+	if (s->flags & SLAB_STORE_USER)
+		*p++ = 'U';
+	if (p != name + 1)
+		*p++ = '-';
+	p += sprintf(p,"%06d:0x%p" ,s->size, s);
+	BUG_ON(p > name + ID_STR_LENGTH - 1);
+	return name;
+}
+
 static int sysfs_slab_add(struct kmem_cache *s)
 {
 	int err;
+	const char *name;
 
 	if (slab_state < SYSFS)
 		/* Defer until later */
 		return 0;
-
+	if (s->flags & SLUB_NEVER_MERGE) {
+		/*
+		 * Slabcache can never be merged so we can use the name proper.
+		 * This is typically the case for debug situations. In that
+		 * case we can catch duplicate names easily.
+		 */
+		sysfs_remove_link(&slab_subsys.kset.kobj, s->name);
+		name = s->name;
+	} else
+		/*
+		 * Create a unique name for the slab as a target
+		 * for the symlinks.
+		 */
+		name = create_unique_id(s);
 	kobj_set_kset_s(s, slab_subsys);
-	kobject_set_name(&s->kobj, s->name);
+	kobject_set_name(&s->kobj, name);
 	kobject_init(&s->kobj);
 	err = kobject_add(&s->kobj);
 	if (err)
@@ -3316,6 +3366,8 @@ static int sysfs_slab_add(struct kmem_ca
 	if (err)
 		return err;
 	kobject_uevent(&s->kobj, KOBJ_ADD);
+	if (!(s->flags & SLUB_NEVER_MERGE))
+		sysfs_slab_alias(s, s->name);
 	return 0;
 }
 
@@ -3341,9 +3393,14 @@ static int sysfs_slab_alias(struct kmem_
 {
 	struct saved_alias *al;
 
-	if (slab_state == SYSFS)
+	if (slab_state == SYSFS) {
+		/*
+		 * If we have a leftover link then remove it.
+		 */
+		sysfs_remove_link(&slab_subsys.kset.kobj, name);
 		return sysfs_create_link(&slab_subsys.kset.kobj,
 						&s->kobj, name);
+	}
 
 	al = kmalloc(sizeof(struct saved_alias), GFP_KERNEL);
 	if (!al)