diff --git a/tools/include/linux/slab.h b/tools/include/linux/slab.h
index f41d8a0eb1a4204bf312d89de69a066b7d2a0ae1..0616409513eb7947409f23045dd6395a9b68ce0e 100644
--- a/tools/include/linux/slab.h
+++ b/tools/include/linux/slab.h
@@ -28,7 +28,13 @@ static inline void *kzalloc(size_t size, gfp_t gfp)
 	return kmalloc(size, gfp | __GFP_ZERO);
 }
 
-void *kmem_cache_alloc(struct kmem_cache *cachep, int flags);
+struct list_lru;
+
+void *kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *, int flags);
+static inline void *kmem_cache_alloc(struct kmem_cache *cachep, int flags)
+{
+	return kmem_cache_alloc_lru(cachep, NULL, flags);
+}
 void kmem_cache_free(struct kmem_cache *cachep, void *objp);
 
 struct kmem_cache *kmem_cache_create(const char *name, unsigned int size,
diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
index 81539f5439546868dc2d8d9bfeed7374aa8ef8f3..d5c1bcba86fe00ffa379a6d5bb38095c084f3ce2 100644
--- a/tools/testing/radix-tree/linux.c
+++ b/tools/testing/radix-tree/linux.c
@@ -25,7 +25,8 @@ struct kmem_cache {
 	void (*ctor)(void *);
 };
 
-void *kmem_cache_alloc(struct kmem_cache *cachep, int gfp)
+void *kmem_cache_alloc_lru(struct kmem_cache *cachep, struct list_lru *lru,
+		int gfp)
 {
 	void *p;