linux-kernel - Re: [PATCH v2 5/5] rust: maple

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Message-Id: <DC6DQKE6LVNQ.3BBD8WF8XGROO@kernel.org>
Date: Tue, 19 Aug 2025 13:49:27 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Alice Ryhl" <aliceryhl@...gle.com>
Cc: "Andrew Morton" <akpm@...ux-foundation.org>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, "Lorenzo Stoakes" <lorenzo.stoakes@...cle.com>,
 "Miguel Ojeda" <ojeda@...nel.org>, "Andrew Ballance"
 <andrewjballance@...il.com>, "Boqun Feng" <boqun.feng@...il.com>, "Gary
 Guo" <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, "Benno Lossin" <lossin@...nel.org>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Trevor Gross" <tmgross@...ch.edu>,
 <linux-kernel@...r.kernel.org>, <maple-tree@...ts.infradead.org>,
 <rust-for-linux@...r.kernel.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v2 5/5] rust: maple_tree: add MAINTAINERS entry

On Tue Aug 19, 2025 at 12:34 PM CEST, Alice Ryhl wrote:
> Similar to and just below the existing MAPLE TREE entry.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
> Liam: I'm not sure what you prefer for the MAINTAINERS entry, so let me
> know if you want anything changed. There are also a few other options,
> for example, I could just add the files under the existing MAPLE TREE
> entry? The get_maintainers script should still send any relevant patches
> my way because they also match the RUST entry that has a wildcard on the
> rust/ directory.

>From v1 [1]:

	>> We should have another section for the maple tree, since it's not just
	>> used for mm.  Your stated plan is to use it for GPU allocations and the
	>> code doesn't live in mm/, wdyt?

	> Sure, I can add a new section if you prefer that.

Maple tree is already used outside of mm, e.g. for regmap stuff and I also use
it in nouveau. Hence, I read this as moving maple tree to e.g. lib/ adjusting
the existing entry.

I personally think that - of course unless the affected people prefer otherwise
- it is usually best to keep a single maintainers entry for the C and the Rust
code. Maybe Alice can simply be added to the existing maintainers entry?

What do you think?

[1] https://lore.kernel.org/all/aJW3L3SEVUl_AVvN@google.com/

> Which tree does maple tree patches usually land through?
>
> Andrew Ballance: You mentioned being interested in being listed here as
> well?
> ---
>  MAINTAINERS | 10 ++++++++++
>  1 file changed, 10 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 26053163fe5aed2fc4b4e39d47062c93b873ac13..4a52d884e36eafe1c819227207123c51caf02ee5 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14674,6 +14674,16 @@ F:	lib/test_maple_tree.c
>  F:	tools/testing/radix-tree/maple.c
>  F:	tools/testing/shared/linux/maple_tree.h
>  
> +MAPLE TREE [RUST]
> +M:	Liam R. Howlett <Liam.Howlett@...cle.com>
> +M:	Alice Ryhl <aliceryhl@...gle.com>
> +L:	maple-tree@...ts.infradead.org
> +L:	linux-mm@...ck.org
> +L:	rust-for-linux@...r.kernel.org
> +S:	Supported
> +F:	rust/helpers/maple_tree.c
> +F:	rust/kernel/maple_tree.rs
> +
>  MARDUK (CREATOR CI40) DEVICE TREE SUPPORT
>  M:	Rahul Bedarkar <rahulbedarkar89@...il.com>
>  L:	linux-mips@...r.kernel.org
>
> -- 
> 2.51.0.rc1.167.g924127e9c0-goog