linux-kernel - [PATCH] tracing: Fix output of set_event for some cached module events

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Message-ID: <20250121151336.6c491844@gandalf.local.home>
Date: Tue, 21 Jan 2025 15:13:36 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: LKML <linux-kernel@...r.kernel.org>, Linux Trace Kernel
 <linux-trace-kernel@...r.kernel.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>
Subject: [PATCH] tracing: Fix output of set_event for some cached module
 events

From: Steven Rostedt <rostedt@...dmis.org>

The following works fine:

 ~# echo ':mod:trace_events_sample' > /sys/kernel/tracing/set_event
 ~# cat /sys/kernel/tracing/set_event
 *:*:mod:trace_events_sample
 ~#

But if a name is given without a ':' where it can match an event name or
system name, the output of the cached events does not include a new line:

 ~# echo 'foo_bar:mod:trace_events_sample' > /sys/kernel/tracing/set_event
 ~# cat /sys/kernel/tracing/set_event
 foo_bar:mod:trace_events_sample~#

Add the '\n' to that as well.

Fixes: b355247df104e ("tracing: Cache ":mod:" events for modules not loaded yet")
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace_events.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index 5217dcddcb4c..a9d7d02bbb20 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -1634,7 +1634,7 @@ static int s_show(struct seq_file *m, void *v)
 
 	/* When match is set, system and event are not */
 	if (iter->event_mod->match) {
-		seq_printf(m, "%s:mod:%s", iter->event_mod->match,
+		seq_printf(m, "%s:mod:%s\n", iter->event_mod->match,
 			   iter->event_mod->module);
 		return 0;
 	}
-- 
2.45.2