linux-kernel - [for-next][PATCH 04/20] tracing/kprobes: Skip setup_boot_kprobe

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Message-ID: <20260209022052.701967355@kernel.org>
Date: Sun, 08 Feb 2026 21:20:30 -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>,
 Yaxiong Tian <tianyaxiong@...inos.cn>
Subject: [for-next][PATCH 04/20] tracing/kprobes: Skip setup_boot_kprobe_events() when no cmdline
 event

From: Yaxiong Tian <tianyaxiong@...inos.cn>

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.

Link: https://patch.msgid.link/20260204015401.163748-1-tianyaxiong@kylinos.cn
Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
Signed-off-by: Yaxiong Tian <tianyaxiong@...inos.cn>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
 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;
-- 
2.51.0