linux-kernel - [PATCH] rcu/kvfree: Invoke debug_rcu_bhead_unqueue() with check bnode->snap is done

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Date:   Wed,  5 Apr 2023 10:13:59 +0800
From:   Zqiang <qiang1.zhang@...el.com>
To:     urezki@...il.com, paulmck@...nel.org, frederic@...nel.org,
        joel@...lfernandes.org, qiang1.zhang@...el.com
Cc:     qiang.zhang1211@...il.com, rcu@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] rcu/kvfree: Invoke debug_rcu_bhead_unqueue() with check bnode->snap is done

This commit make debug_rcu_bhead_unqueue() be invoked with check
the bnode structure's->snap is done in kvfree_rcu_bulk().

Signed-off-by: Zqiang <qiang1.zhang@...el.com>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 3461fc2640b9..17b5d115aec1 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2943,8 +2943,8 @@ kvfree_rcu_bulk(struct kfree_rcu_cpu *krcp,
 	unsigned long flags;
 	int i;
 
-	debug_rcu_bhead_unqueue(bnode);
 	if (!WARN_ON_ONCE(!poll_state_synchronize_rcu_full(&bnode->gp_snap))) {
+		debug_rcu_bhead_unqueue(bnode);
 		rcu_lock_acquire(&rcu_callback_map);
 		if (idx == 0) { // kmalloc() / kfree().
 			trace_rcu_invoke_kfree_bulk_callback(
-- 
2.32.0