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From:   Peng Zhang <zhangpeng.00@bytedance.com>
To:     Liam.Howlett@oracle.com, corbet@lwn.net, akpm@linux-foundation.org,
        willy@infradead.org, brauner@kernel.org, surenb@google.com,
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        peterz@infradead.org, oliver.sang@intel.com, mst@redhat.com
Cc:     zhangpeng.00@bytedance.com, maple-tree@lists.infradead.org,
        linux-mm@kvack.org, linux-doc@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: [PATCH v7 09/10] maple_tree: Preserve the tree attributes when destroying maple tree
Date:   Fri, 27 Oct 2023 11:38:44 +0800
Message-Id: <20231027033845.90608-10-zhangpeng.00@bytedance.com>
In-Reply-To: <20231027033845.90608-1-zhangpeng.00@bytedance.com>
References: <20231027033845.90608-1-zhangpeng.00@bytedance.com>
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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@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.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 718a222cc090..4439469442c7 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6763,7 +6763,7 @@ 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