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

[Peng Zhang]

在 2023/10/9 17:03, Peng Zhang 写道:
> 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 at bytedance.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)If I put everything into exit_mmap() for handling, this patch would
not be necessary. But I think this patch is reasonable as it simply
deletes all elements without requiring us to reinitialize the tree.
What do you think?
>   }
>   EXPORT_SYMBOL_GPL(__mt_destroy);
>