The patch titled
Subject: maple_tree: preserve the tree attributes when destroying maple tree
has been added to the -mm mm-unstable branch. Its filename is
maple_tree-preserve-the-tree-attributes-when-destroying-maple-tree.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/maple_tree-preserve-the-tree-attributes-when-destroying-maple-tree.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Subject: maple_tree: preserve the tree attributes when destroying maple tree
Date: Fri, 27 Oct 2023 11:38:44 +0800
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@xxxxxxxxxxxxx
Signed-off-by: Peng Zhang <zhangpeng.00@xxxxxxxxxxxxx>
Reviewed-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Mateusz Guzik <mjguzik@xxxxxxxxx>
Cc: Mathieu Desnoyers <mathieu.desnoyers@xxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Michael S. Tsirkin <mst@xxxxxxxxxx>
Cc: Mike Christie <michael.christie@xxxxxxxxxx>
Cc: Nicholas Piggin <npiggin@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/maple_tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/lib/maple_tree.c~maple_tree-preserve-the-tree-attributes-when-destroying-maple-tree
+++ a/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);
_
Patches currently in -mm which might be from zhangpeng.00@xxxxxxxxxxxxx are
maple_tree-add-mt_free_one-and-mt_attr-helpers.patch
maple_tree-introduce-mtreemas_lock_nested.patch
maple_tree-introduce-interfaces-__mt_dup-and-mtree_dup.patch
radix-tree-test-suite-align-kmem_cache_alloc_bulk-with-kernel-behavior.patch
maple_tree-add-test-for-mtree_dup.patch
maple_tree-update-the-documentation-of-maple-tree.patch
maple_tree-skip-other-tests-when-bench-is-enabled.patch
maple_tree-update-check_forking-and-bench_forking.patch
maple_tree-preserve-the-tree-attributes-when-destroying-maple-tree.patch
fork-use-__mt_dup-to-duplicate-maple-tree-in-dup_mmap.patch
