From 3743b40f655249489c00b52a1481f789eba2f4bb Mon Sep 17 00:00:00 2001
From: Peng Zhang <zhangpeng.00@bytedance.com>
Date: Fri, 27 Oct 2023 11:38:44 +0800
Subject: [PATCH] FROMGIT: 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.

Link: https://lkml.kernel.org/r/20231027033845.90608-10-zhangpeng.00@bytedance.com
Signed-off-by: Peng Zhang <zhangpeng.00@bytedance.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Mateusz Guzik <mjguzik@gmail.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Mike Christie <michael.christie@oracle.com>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

(cherry picked from commit 8e50d32c7a89bde896945e4e572ef28ccd87bbf8
https://git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm mm-unstable)

Bug: 308042511
Change-Id: If1725d5a37dcd26bec23e6bffe95d877903dfab1
Signed-off-by: Suren Baghdasaryan <surenb@google.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 3bc5414f78ab..1200ff73c1b0 100644
--- a/lib/maple_tree.c
+++ b/lib/maple_tree.c
@@ -6825,7 +6825,7 @@ 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);