linux-kernel - [PATCH 2/2] ftrace: don't allocate ftrace module map

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Message-Id: <20250523083945.3390587-3-yebin@huaweicloud.com>
Date: Fri, 23 May 2025 16:39:45 +0800
From: Ye Bin <yebin@...weicloud.com>
To: rostedt@...dmis.org,
	mhiramat@...nel.org,
	mathieu.desnoyers@...icios.com,
	mark.rutland@....com,
	linux-trace-kernel@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	yebin10@...wei.com
Subject: [PATCH 2/2] ftrace: don't allocate  ftrace module map

From: Ye Bin <yebin10@...wei.com>

If the ftrace is disabled, it is meaningless to allocate  module map.
So add check in ftrace_free_mem().

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 kernel/trace/ftrace.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index ff5d9d73a4a7..56adf45de92e 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -7824,6 +7824,11 @@ void ftrace_free_mem(struct module *mod, void *start_ptr, void *end_ptr)
 
 	mutex_lock(&ftrace_lock);
 
+	if (ftrace_disabled || (mod && !mod->num_ftrace_callsites)) {
+		mutex_unlock(&ftrace_lock);
+		return;
+	}
+
 	/*
 	 * If we are freeing module init memory, then check if
 	 * any tracer is active. If so, we need to save a mapping of
-- 
2.34.1