[PATCH 20/20 v2] tracing: Add argument error message too many args for function based events

[Steven Rostedt]

From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>

If too many arguments are added to the function_events, have the error
message state that instead of saying the type of argument that passed the
allowed amount is incorrect.

Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---
 kernel/trace/trace_event_ftrace.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_event_ftrace.c b/kernel/trace/trace_event_ftrace.c
index 314d025dc676..e612b1c4fc40 100644
--- a/kernel/trace/trace_event_ftrace.c
+++ b/kernel/trace/trace_event_ftrace.c
@@ -1380,8 +1380,14 @@ static void add_failure(struct func_event *func_event, char *token,
 
 	trace_seq_printf(s, "\n%*s\n", len, "^");
 
-	trace_seq_printf(s, "Unexpected token '%s' for %s state",
-			 save_token, func_state_names[state]);
+	/* for COMMA or PARAM state, the error could be too many args */
+	if ((state == FUNC_STATE_COMMA || state == FUNC_STATE_PARAM) &&
+	    func_event->arg_cnt >= max_args)
+		trace_seq_printf(s, "Error: Too many arguments (max of %d)",
+				 max_args);
+	else
+		trace_seq_printf(s, "Unexpected token '%s' for %s state",
+				 save_token, func_state_names[state]);
 
  finish:
 	len = min(ERR_SIZE-1, s->seq.len);
-- 
2.15.1