linux-kernel - [PATCH] tracing: Show the tracer options in boot-time created instance

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Message-ID:  <176345219055.1127138.4292126981726580037.stgit@mhiramat.tok.corp.google.com>
Date: Tue, 18 Nov 2025 16:49:50 +0900
From: "Masami Hiramatsu (Google)" <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH] tracing: Show the tracer options in boot-time created instance

From: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Since tracer_init_tracefs_work_func() only updates the tracer options
for the global_trace, the instances created by the kernel cmdline
do not have those options.

Fix to update tracer options for those boot-time created instances
to show those options.

Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Fixes: f20a580627f43 ("ftrace: Allow instances to use function tracing")
---
 kernel/trace/trace.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8ae95800592d..2e87060e1d5a 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -10903,6 +10903,7 @@ static struct notifier_block trace_module_nb = {
 
 static __init void tracer_init_tracefs_work_func(struct work_struct *work)
 {
+	struct trace_array *tr;
 
 	event_trace_init();
 
@@ -10937,7 +10938,8 @@ static __init void tracer_init_tracefs_work_func(struct work_struct *work)
 
 	create_trace_instances(NULL);
 
-	update_tracer_options(&global_trace);
+	list_for_each_entry(tr, &ftrace_trace_arrays, list)
+		update_tracer_options(tr);
 }
 
 static __init int tracer_init_tracefs(void)