linux-kernel - [PATCH v4 3/5] tracing/kprobes: Skip setup_boot_kprobe

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Message-Id: <20260128125507.1715149-1-tianyaxiong@kylinos.cn>
Date: Wed, 28 Jan 2026 20:55:07 +0800
From: Yaxiong Tian <tianyaxiong@...inos.cn>
To: mhiramat@...nel.org,
	rostedt@...dmis.org,
	axboe@...nel.dk,
	mathieu.desnoyers@...icios.com,
	corbet@....net,
	skhan@...uxfoundation.org
Cc: linux-trace-kernel@...r.kernel.org,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [PATCH v4 3/5] tracing/kprobes: Skip setup_boot_kprobe_events() when no cmdline event

When the 'kprobe_event=' kernel command-line parameter is not provided,
there is no need to execute setup_boot_kprobe_events().

This change optimizes the initialization function init_kprobe_trace()
by skipping unnecessary work and effectively prevents potential blocking
that could arise from contention on the event_mutex lock in subsequent
operations.

Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
---
 kernel/trace/trace_kprobe.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 9953506370a5..89d2740f7bb5 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -2048,6 +2048,10 @@ static __init int init_kprobe_trace(void)
 	trace_create_file("kprobe_profile", TRACE_MODE_READ,
 			  NULL, NULL, &kprobe_profile_ops);
 
+	/* If no 'kprobe_event=' cmd is provided, return directly. */
+	if (kprobe_boot_events_buf[0] == '\0')
+		return 0;
+
 	setup_boot_kprobe_events();
 
 	return 0;
-- 
2.25.1