1 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index e0a4f652f289..a4088ced1e64 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/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;