diff --git a/mm/rmap.c b/mm/rmap.c
index 8701d5f..1099394 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -55,7 +55,17 @@
 
 #include "internal.h"
 
-struct kmem_cache *anon_vma_cachep;
+static struct kmem_cache *anon_vma_cachep;
+
+static inline struct anon_vma *anon_vma_alloc(void)
+{
+	return kmem_cache_alloc(anon_vma_cachep, GFP_KERNEL);
+}
+
+static inline void anon_vma_free(struct anon_vma *anon_vma)
+{
+	kmem_cache_free(anon_vma_cachep, anon_vma);
+}
 
 /**
  * anon_vma_prepare - attach an anon_vma to a memory region