linux-kernel - [PATCH v3] tracing: Show the tracer options in boot-time created instance

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID:  <176354112555.2356172.3989277078358802353.stgit@mhiramat.tok.corp.google.com>
Date: Wed, 19 Nov 2025 17:32:05 +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 v3] 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.

Fixes: 428add559b69 ("tracing: Have tracer option be instance specific")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
---
  Changes in v3:
   - Fix to update tracer_options_updated before update.
  Changes in v2:
   - Fix update_tracer_options() to update all instances.
   - Update tracer_options_updated after update all instances.
---
 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 8ae95800592d..33fcde91924c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -10231,11 +10231,14 @@ 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 */
@@ -10937,7 +10940,7 @@ 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)