From 2614f3a6a8cb738421a8b98ae261658b47709567 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=BC=A0=E5=8D=9A=E8=BF=9C?= <2022211680@bupt.cn>
Date: Sat, 28 Dec 2024 03:16:25 +0000
Subject: [PATCH] update kernel/trace/bpf_trace.c.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 张博远 <2022211680@bupt.cn>
---
 kernel/trace/bpf_trace.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/kernel/trace/bpf_trace.c b/kernel/trace/bpf_trace.c
index 981a4ad103eb..737786f4ce3a 100644
--- a/kernel/trace/bpf_trace.c
+++ b/kernel/trace/bpf_trace.c
@@ -2221,7 +2221,12 @@ void perf_event_detach_bpf_prog(struct perf_event *event)
 		rcu_assign_pointer(event->tp_event->prog_array, new_array);
 		bpf_prog_array_free_sleepable(old_array);
 	}
-
+    /*
+	 * It could be that the bpf_prog is not sleepable (and will be freed
+	 * via normal RCU), but is called from a point that supports sleepable
+	 * programs and uses tasks-trace-RCU.
+	 */
+	synchronize_rcu_tasks_trace();
 	bpf_prog_put(event->prog);
 	event->prog = NULL;
 
-- 
Gitee