diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index cb0ce3f..cbc168f 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -182,6 +182,12 @@
 	struct power_trace	state_data;
 };
 
+enum kmemtrace_type_id {
+	KMEMTRACE_TYPE_KMALLOC = 0,	/* kmalloc() or kfree(). */
+	KMEMTRACE_TYPE_CACHE,		/* kmem_cache_*(). */
+	KMEMTRACE_TYPE_PAGES,		/* __get_free_pages() and friends. */
+};
+
 struct kmemtrace_alloc_entry {
 	struct trace_entry	ent;
 	enum kmemtrace_type_id type_id;