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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1632d0e6-2d52-43b1-8a01-056231c0819d@bytedance.com>
Date:   Wed, 11 Oct 2023 23:42:30 +0800
From:   Peng Zhang <zhangpeng.00@...edance.com>
To:     Liam.Howlett@...cle.com
Cc:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        Peng Zhang <zhangpeng.00@...edance.com>, corbet@....net,
        akpm@...ux-foundation.org, willy@...radead.org, brauner@...nel.org,
        surenb@...gle.com, michael.christie@...cle.com, mjguzik@...il.com,
        mathieu.desnoyers@...icios.com, npiggin@...il.com,
        peterz@...radead.org, oliver.sang@...el.com, mst@...hat.com
Subject: Re: [PATCH v4 09/10] maple_tree: Preserve the tree attributes when
 destroying maple tree



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@...edance.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);
>