diff --git a/tools/testing/radix-tree/linux/slab.h b/tools/testing/radix-tree/linux/slab.h
new file mode 100644
index 0000000..57282506
--- /dev/null
+++ b/tools/testing/radix-tree/linux/slab.h
@@ -0,0 +1,28 @@
+#ifndef SLAB_H
+#define SLAB_H
+
+#include <linux/types.h>
+
+#define GFP_KERNEL 1
+#define SLAB_HWCACHE_ALIGN 1
+#define SLAB_PANIC 2
+#define SLAB_RECLAIM_ACCOUNT    0x00020000UL            /* Objects are reclaimable */
+
+static inline int gfpflags_allow_blocking(gfp_t mask)
+{
+	return 1;
+}
+
+struct kmem_cache {
+	int size;
+	void (*ctor)(void *);
+};
+
+void *kmem_cache_alloc(struct kmem_cache *cachep, int flags);
+void kmem_cache_free(struct kmem_cache *cachep, void *objp);
+
+struct kmem_cache *
+kmem_cache_create(const char *name, size_t size, size_t offset,
+	unsigned long flags, void (*ctor)(void *));
+
+#endif		/* SLAB_H */