mm/sl[aou]b: Move freeing of kmem_cache structure to common code

The freeing action is basically the same in all slab allocators.
Move to the common kmem_cache_destroy() function.

Reviewed-by: Glauber Costa <glommer@parallels.com>
Reviewed-by: Joonsoo Kim <js1304@gmail.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>

mm/slab.c

@@ -2225,7 +2225,6 @@ void __kmem_cache_destroy(struct kmem_cache *cachep)
 			kfree(l3);
 		}
 	}
-	kmem_cache_free(kmem_cache, cachep);
 }
 
 

mm/slab_common.c

@@ -154,6 +154,7 @@ void kmem_cache_destroy(struct kmem_cache *s)
 				rcu_barrier();
 
 			__kmem_cache_destroy(s);
+			kmem_cache_free(kmem_cache, s);
 		} else {
 			list_add(&s->list, &slab_caches);
 			printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n",

mm/slob.c

@@ -540,8 +540,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
 
 void __kmem_cache_destroy(struct kmem_cache *c)
 {
-	kmemleak_free(c);
-	slob_free(c, sizeof(struct kmem_cache));
 }
 
 void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)

mm/slub.c

@@ -213,7 +213,6 @@ static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p)
 static inline void sysfs_slab_remove(struct kmem_cache *s)
 {
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 #endif
@@ -5206,7 +5205,6 @@ static void kmem_cache_release(struct kobject *kobj)
 	struct kmem_cache *s = to_slab(kobj);
 
 	kfree(s->name);
-	kmem_cache_free(kmem_cache, s);
 }
 
 static const struct sysfs_ops slab_sysfs_ops = {