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FROMGIT: maple_tree: preserve the tree attributes when destroying maple tree

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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.

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>
This commit is contained in:
Peng Zhang 2023-10-27 11:38:44 +08:00 committed by Suren Baghdasaryan
parent 1bec2dd52e
commit 3743b40f65
1 changed files with 1 additions and 1 deletions
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2
lib/maple_tree.c
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@ -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);