linux-kernel - [PATCH v4 09/10] maple_tree: Preserve the tree attributes when destroying maple tree

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Message-Id: <20231009090320.64565-10-zhangpeng.00@bytedance.com>
Date:   Mon,  9 Oct 2023 17:03:19 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com, corbet@....net, akpm@...ux-foundation.org,
        willy@...radead.org, brauner@...nel.org, surenb@...gle.com,
        michael.christie@...cle.com, mjguzik@...il.com,
        mathieu.desnoyers@...icios.com, npiggin@...il.com,
        peterz@...radead.org, oliver.sang@...el.com, mst@...hat.com
Cc:     zhangpeng.00@...edance.com, maple-tree@...ts.infradead.org,
        linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: [PATCH v4 09/10] maple_tree: Preserve the tree attributes when destroying maple tree

When destroying maple tree, preserve its attributes and then turn it
into an empty tree. This allows it to be reused without needing to be
reinitialized.

Signed-off-by: Peng Zhang <zhangpeng.00@...edance.com>
---
 lib/maple_tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/maple_tree.c b/lib/maple_tree.c
index d5544382ff15..1745242092fb 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6775,7 +6775,7 @@ void __mt_destroy(struct maple_tree *mt)
 	if (xa_is_node(root))
 		mte_destroy_walk(root, mt);
 
-	mt->ma_flags = 0;
+	mt->ma_flags = mt_attr(mt);
 }
 EXPORT_SYMBOL_GPL(__mt_destroy);
 
-- 
2.20.1