linux-kernel - [PATCH 1/3] tracing: Export eval_map_wq for asynchronous use by other modules

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Message-Id: <20260122032415.395548-1-tianyaxiong@kylinos.cn>
Date: Thu, 22 Jan 2026 11:24:15 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: axboe@...nel.dk,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com
Cc: linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [PATCH 1/3] tracing: Export eval_map_wq for asynchronous use by other modules

The eval_map_work_func() function, though queued in eval_map_wq,
holds the trace_event_sem read-write lock for a long time during
kernel boot. This causes blocking issues for other functions.

Making eval_map_wq extern allows other modules to schedule their
work asynchronously on this queue,  preventing it from blocking
the main boot thread.

Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
---
 kernel/trace/trace.c | 2 +-
 kernel/trace/trace.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index e18005807395..cb073d0c86a6 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -10774,7 +10774,7 @@ int tracing_init_dentry(void)
 extern struct trace_eval_map *__start_ftrace_eval_maps[];
 extern struct trace_eval_map *__stop_ftrace_eval_maps[];
 
-static struct workqueue_struct *eval_map_wq __initdata;
+struct workqueue_struct *eval_map_wq __initdata;
 static struct work_struct eval_map_work __initdata;
 static struct work_struct tracerfs_init_work __initdata;
 
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index de4e6713b84e..44aaabc46a7a 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -770,6 +770,8 @@ extern unsigned long nsecs_to_usecs(unsigned long nsecs);
 
 extern unsigned long tracing_thresh;
 
+extern struct workqueue_struct *eval_map_wq __initdata;
+
 /* PID filtering */
 
 bool trace_find_filtered_pid(struct trace_pid_list *filtered_pids,
-- 
2.25.1