1 files changed, 21 insertions, 2 deletions

diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
index 0362d575de7d..8a5b65df6efb 100644
--- a/tools/lib/traceevent/event-parse.c
+++ b/tools/lib/traceevent/event-parse.c
@@ -1606,6 +1606,24 @@ process_arg(struct event_format *event, struct print_arg *arg, char **tok)
 static enum event_type
 process_op(struct event_format *event, struct print_arg *arg, char **tok);
 
+/*
+ * For __print_symbolic() and __print_flags, we need to completely
+ * evaluate the first argument, which defines what to print next.
+ */
+static enum event_type
+process_field_arg(struct event_format *event, struct print_arg *arg, char **tok)
+{
+        enum event_type type;
+
+        type = process_arg(event, arg, tok);
+
+        while (type == EVENT_OP) {
+                type = process_op(event, arg, tok);
+        }
+
+        return type;
+}
+
 static enum event_type
 process_cond(struct event_format *event, struct print_arg *top, char **tok)
 {
@@ -2371,7 +2389,7 @@ process_flags(struct event_format *event, struct print_arg *arg, char **tok)
                 goto out_free;
         }
 
-        type = process_arg(event, field, &token);
+        type = process_field_arg(event, field, &token);
 
         /* Handle operations in the first argument */
         while (type == EVENT_OP)
@@ -2424,7 +2442,8 @@ process_symbols(struct event_format *event, struct print_arg *arg, char **tok)
                 goto out_free;
         }
 
-        type = process_arg(event, field, &token);
+        type = process_field_arg(event, field, &token);
+
         if (test_type_token(type, token, EVENT_DELIM, ","))
                 goto out_free_field;