linux-kernel - [for-next][PATCH 04/13] tracing: Show the tracer options in boot-time created instance

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Message-ID: <20251128012411.471594850@kernel.org>
Date: Thu, 27 Nov 2025 20:23:35 -0500
From: Steven Rostedt <rostedt@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Andrew Morton <akpm@...ux-foundation.org>
Subject: [for-next][PATCH 04/13] 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.

Cc: Mark Rutland <mark.rutland@....com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Link: https://patch.msgid.link/176354112555.2356172.3989277078358802353.stgit@mhiramat.tok.corp.google.com
Fixes: 428add559b69 ("tracing: Have tracer option be instance specific")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 kernel/trace/trace.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 59cd4ed8af6d..032bdedca5d9 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -10228,11 +10228,14 @@ static __init int __update_tracer_options(struct trace_array *tr)
 	return ret;
 }
 
-static __init void update_tracer_options(struct trace_array *tr)
+static __init void update_tracer_options(void)
 {
+	struct trace_array *tr;
+
 	guard(mutex)(&trace_types_lock);
 	tracer_options_updated = true;
-	__update_tracer_options(tr);
+	list_for_each_entry(tr, &ftrace_trace_arrays, list)
+		__update_tracer_options(tr);
 }
 
 /* Must have trace_types_lock held */
@@ -10934,7 +10937,7 @@ static __init void tracer_init_tracefs_work_func(struct work_struct *work)
 
 	create_trace_instances(NULL);
 
-	update_tracer_options(&global_trace);
+	update_tracer_options();
 }
 
 static __init int tracer_init_tracefs(void)
-- 
2.51.0