linux-kernel - Re: [PATCH 1/3] rust: maple

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Message-ID: <t6lhpij2tv2y3cbps6g3mu6boiic2amy3xx6ppkksrb2625odo@6plivbxstgkm>
Date: Thu, 7 Aug 2025 12:12:47 -0400
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        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>, Danilo Krummrich <dakr@...nel.org>,
        linux-kernel@...r.kernel.org, maple-tree@...ts.infradead.org,
        rust-for-linux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] rust: maple_tree: add MapleTree

* Alice Ryhl <aliceryhl@...gle.com> [250726 09:23]:
> The maple tree will be used in the Tyr driver to allocate and keep track
> of GPU allocations created internally (i.e. not by userspace). It will
> likely also be used in the Nova driver eventually.
> 
> This adds the simplest methods for additional and removal that do not
> require any special care with respect to concurrency.
> 
> This implementation is based on the RFC by Andrew but with significant
> changes to simplify the implementation.
> 
> Co-developed-by: Andrew Ballance <andrewjballance@...il.com>
> Signed-off-by: Andrew Ballance <andrewjballance@...il.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>
> ---
>  MAINTAINERS               |   2 +
>  rust/helpers/helpers.c    |   1 +
>  rust/helpers/maple_tree.c |  14 +++
>  rust/kernel/lib.rs        |   1 +
>  rust/kernel/maple_tree.rs | 286 ++++++++++++++++++++++++++++++++++++++++++++++
>  5 files changed, 304 insertions(+)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index dd810da5261b5d664ef9750f66ec022412e8014b..b7e7308ce07c050239c14c4f3a0fd89bdd8e8796 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15956,7 +15956,9 @@ L:	rust-for-linux@...r.kernel.org
>  S:	Maintained
>  W:	http://www.linux-mm.org
>  T:	git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
> +F:	rust/helpers/maple_tree.c
>  F:	rust/helpers/mm.c
> +F:	rust/kernel/maple_tree.rs
>  F:	rust/kernel/mm.rs
>  F:	rust/kernel/mm/

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?

...

Thanks,
Liam