[PATCH 1/3] tracing: Export eval_map_wq for asynchronous use by other modules
From: Yaxiong Tian <hidden>
Date: 2026-01-22 03:24:24
Also in:
linux-block, lkml
Subsystem:
the rest, tracing · Maintainers:
Linus Torvalds, Steven Rostedt, Masami Hiramatsu
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 <redacted> --- 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,
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2.25.1