1 files changed, 6 insertions, 2 deletions

diff --git a/tools/perf/util/sort.h b/tools/perf/util/sort.h
index cb6151c026f2..925f083e1eee 100644
--- a/tools/perf/util/sort.h
+++ b/tools/perf/util/sort.h
@@ -49,9 +49,13 @@ struct hist_entry {
         struct symbol           *sym;
         u64                     ip;
         char                    level;
-        struct symbol           *parent;
+        struct symbol     *parent;
         struct callchain_node   callchain;
-        struct rb_root          sorted_chain;
+        union {
+                unsigned long     position;
+                struct hist_entry *pair;
+                struct rb_root    sorted_chain;
+        };
 };
 
 enum sort_type {