Re: [PATCH v12.1 1/1] rust: gpu: Add GPU buddy allocator bindings

[Danilo Krummrich]

On Mon Mar 9, 2026 at 2:53 PM CET, Joel Fernandes wrote:
> Add safe Rust abstractions over the Linux kernel's GPU buddy
> allocator for physical memory management. The GPU buddy allocator
> implements a binary buddy system useful for GPU physical memory
> allocation. nova-core will use it for physical memory allocation.
>
> Christian Koenig mentioned he'd like to step down from reviewer role for
> GPU buddy so updated accordingly. Arun/Matthew agree on the modified entry.
>
> Cc: Nikola Djukic <ndjukic@xxxxxxxxxx>
> Signed-off-by: Joel Fernandes <joelagnelf@xxxxxxxxxx>
> ---
>  MAINTAINERS                     |   6 +-
>  rust/bindings/bindings_helper.h |  11 +
>  rust/helpers/gpu.c              |  23 ++
>  rust/helpers/helpers.c          |   1 +
>  rust/kernel/gpu/buddy.rs        | 611 ++++++++++++++++++++++++++++++++
>  rust/kernel/gpu/mod.rs          |   5 +
>  rust/kernel/lib.rs              |   2 +
>  7 files changed, 658 insertions(+), 1 deletion(-)
>  create mode 100644 rust/helpers/gpu.c
>  create mode 100644 rust/kernel/gpu/buddy.rs
>  create mode 100644 rust/kernel/gpu/mod.rs
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 4c66f8261ff2..b2600dd05fc2 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8513,7 +8513,9 @@ T:	git https://gitlab.freedesktop.org/drm/rust/kernel.git
>  F:	drivers/gpu/drm/nova/
>  F:	drivers/gpu/drm/tyr/
>  F:	drivers/gpu/nova-core/
> +F:	rust/helpers/gpu.c
>  F:	rust/kernel/drm/
> +F:	rust/kernel/gpu/
>  
>  DRM DRIVERS FOR ALLWINNER A10
>  M:	Chen-Yu Tsai <wens@xxxxxxxxxx>
> @@ -8926,7 +8928,7 @@ F:	include/drm/ttm/
>  GPU BUDDY ALLOCATOR
>  M:	Matthew Auld <matthew.auld@xxxxxxxxx>
>  M:	Arun Pravin <arunpravin.paneerselvam@xxxxxxx>
> -R:	Christian Koenig <christian.koenig@xxxxxxx>

This should really be a separate patch as it is unrelated to the addition of the
Rust GPU buddy code.

> +R:	Joel Fernandes <joelagnelf@xxxxxxxxxx>
>  L:	dri-devel@xxxxxxxxxxxxxxxxxxxxx
>  S:	Maintained
>  T:	git https://gitlab.freedesktop.org/drm/misc/kernel.git
> @@ -8935,6 +8937,8 @@ F:	drivers/gpu/buddy.c
>  F:	drivers/gpu/tests/gpu_buddy_test.c
>  F:	include/linux/gpu_buddy.h
>  F:	include/drm/drm_buddy.h
> +F:	rust/helpers/gpu.c
> +F:	rust/kernel/gpu/