linux-kernel - Re: [PATCH] maple_tree: Add dead node check in mas_dup

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Message-ID: <rl63ujj4oubstane6ydibgxithuovo6wqzhnjpiv2yatagzecx@vhd2ieobie5f>
Date: Tue, 6 Jan 2026 15:07:17 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Matthew Wilcox <willy@...radead.org>
Cc: Boudewijn van der Heide <boudewijn@...ta-utec.com>,
        akpm@...ux-foundation.org, aliceryhl@...gle.com,
        andrewjballance@...il.com, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, maple-tree@...ts.infradead.org
Subject: Re: [PATCH] maple_tree: Add dead node check in mas_dup_alloc()

* Matthew Wilcox <willy@...radead.org> [260106 13:29]:
> On Tue, Jan 06, 2026 at 11:01:27AM -0500, Liam R. Howlett wrote:
> > The fact that no one in the tree uses it incorrectly means that any
> > backport would be for the benefit of out-of-tree drivers, which we do
> > not support.
> 
> Should this interface be EXPORT_SYMBOL_GPL to make that clear?

I don't think so.

If someone decides to take the technical debt of not upstreaming, then
they should very much read the documentation more carefully.

The locking rules are stated above the function definition.

Thanks,
Liam