diff --git a/[refs] b/[refs]
index 0f4de0b24909..b3378f0458b0 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cda48461c7fb8431a99b7960480f5f42cc1a5324
+refs/heads/master: afdf1a404eed236d6f762ee44cc0f1dcc97206e0
diff --git a/trunk/tools/perf/util/trace-event-parse.c b/trunk/tools/perf/util/trace-event-parse.c
index fde1a434d630..2d424ff50ec2 100644
--- a/trunk/tools/perf/util/trace-event-parse.c
+++ b/trunk/tools/perf/util/trace-event-parse.c
@@ -2106,6 +2106,12 @@ static unsigned long long eval_num_arg(void *data, int size,
 				die("unknown op '%s'", arg->op.op);
 			val = left == right;
 			break;
+		case '-':
+			val = left - right;
+			break;
+		case '+':
+			val = left + right;
+			break;
 		default:
 			die("unknown op '%s'", arg->op.op);
 		}