linux-kernel - [PATCH 8/9] rust: dma: add CoherentObject for single element allocations

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Message-Id: <20260130-coherent-array-v1-8-bcd672dacc70@nvidia.com>
Date: Fri, 30 Jan 2026 17:34:11 +0900
From: Eliot Courtney <ecourtney@...dia.com>
To: Danilo Krummrich <dakr@...nel.org>, 
 Alexandre Courbot <acourbot@...dia.com>, Alice Ryhl <aliceryhl@...gle.com>, 
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
 Abdiel Janulgue <abdiel.janulgue@...il.com>, 
 Daniel Almeida <daniel.almeida@...labora.com>, 
 Robin Murphy <robin.murphy@....com>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Miguel Ojeda <ojeda@...nel.org>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Trevor Gross <tmgross@...ch.edu>
Cc: nouveau@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, 
 linux-kernel@...r.kernel.org, driver-core@...ts.linux.dev, 
 rust-for-linux@...r.kernel.org, Eliot Courtney <ecourtney@...dia.com>
Subject: [PATCH 8/9] rust: dma: add CoherentObject for single element
 allocations

Add a type alias for convenience and readability for single element
allocations.

Signed-off-by: Eliot Courtney <ecourtney@...dia.com>
---
 rust/kernel/dma.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/rust/kernel/dma.rs b/rust/kernel/dma.rs
index 25da678c863b..120fc01e57a3 100644
--- a/rust/kernel/dma.rs
+++ b/rust/kernel/dma.rs
@@ -423,6 +423,9 @@ pub struct CoherentAllocation<T: AsBytes + FromBytes, Size: AllocationSize = Run
 /// A coherent DMA allocation for an array of `N` elements.
 pub type CoherentArray<T, const N: usize> = CoherentAllocation<T, StaticSize<N>>;
 
+/// A coherent DMA allocation for a single object.
+pub type CoherentObject<T> = CoherentAllocation<T, StaticSize<1>>;
+
 impl<T: AsBytes + FromBytes, Size: AllocationSize> CoherentAllocation<T, Size> {
     /// Returns the number of elements `T` in this allocation.
     ///

-- 
2.52.0