---

yaml
---
r: 288680
b: refs/heads/master
c: a5a178e
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 09bda4432a8a4d4db2b2b94697abc8d732a9ff73
+refs/heads/master: a5a178e1ae0192e405830f1bba84548992124e88

trunk/tools/perf/util/trace-event-parse.c

@@ -1423,6 +1423,11 @@ static long long arg_num_eval(struct print_arg *arg)
 				die("unknown op '%s'", arg->op.op);
 			}
 			break;
+		case '+':
+			left = arg_num_eval(arg->op.left);
+			right = arg_num_eval(arg->op.right);
+			val = left + right;
+			break;
 		default:
 			die("unknown op '%s'", arg->op.op);
 		}
@@ -1483,6 +1488,13 @@ process_fields(struct event *event, struct print_flag_sym **list, char **tok)
 
 		free_token(token);
 		type = process_arg(event, arg, &token);
+
+		if (type == EVENT_OP)
+			type = process_op(event, arg, &token);
+
+		if (type == EVENT_ERROR)
+			goto out_free;
+
 		if (test_type_token(type, token, EVENT_DELIM, ","))
 			goto out_free;