linux-kernel - Re: [PATCH v3 2/2] rust: add dma coherent allocator abstraction.

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Message-ID: <CAH5fLgisLyW-d9rsHJ8Vp8HpWh7PZxtkXooVQyMTxs445Ah4GQ@mail.gmail.com>
Date: Mon, 4 Nov 2024 10:31:49 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Abdiel Janulgue <abdiel.janulgue@...il.com>
Cc: rust-for-linux@...r.kernel.org, daniel.almeida@...labora.com, 
	a.hindborg@...nel.org, linux-kernel@...r.kernel.org, dakr@...hat.com, 
	airlied@...hat.com, miguel.ojeda.sandonis@...il.com, wedsonaf@...il.com, 
	Andreas Hindborg <a.hindborg@...sung.com>
Subject: Re: [PATCH v3 2/2] rust: add dma coherent allocator abstraction.

On Mon, Nov 4, 2024 at 10:07 AM Abdiel Janulgue
<abdiel.janulgue@...il.com> wrote:
> +/// Abstraction of dma_alloc_coherent
> +///
> +/// # Invariants
> +///
> +/// For the lifetime of an instance of CoherentAllocation, the cpu address is a valid pointer
> +/// to an allocated region of consistent memory and we hold a reference to the device.
> +pub struct CoherentAllocation<T: Add> {

Requiring `T: Add` is very unusual. Why?

I don't even see any additions anywhere.

Alice