linux-kernel - Re: [PATCH v3 2/5] rust: dma: add type alias for bindings::dma_addr

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Message-Id: <DCCJG1V40J97.1FQA6ZV5JE6RK@kernel.org>
Date: Tue, 26 Aug 2025 19:33:49 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Daniel Almeida" <daniel.almeida@...labora.com>
Cc: <akpm@...ux-foundation.org>, <ojeda@...nel.org>,
 <alex.gaynor@...il.com>, <boqun.feng@...il.com>, <gary@...yguo.net>,
 <bjorn3_gh@...tonmail.com>, <lossin@...nel.org>, <a.hindborg@...nel.org>,
 <aliceryhl@...gle.com>, <tmgross@...ch.edu>, <abdiel.janulgue@...il.com>,
 <acourbot@...dia.com>, <jgg@...pe.ca>, <lyude@...hat.com>,
 <robin.murphy@....com>, <rust-for-linux@...r.kernel.org>,
 <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 2/5] rust: dma: add type alias for
 bindings::dma_addr_t

On Tue Aug 26, 2025 at 7:15 PM CEST, Daniel Almeida wrote:
> Hmm, I wonder if this shouldn’t be its own type, instead of an alias. This
> will be handy if we want to enforce that a given address is, in fact, a bus
> address.

I'm not sure I understand the idea. How can a new type compared to a type alias
help to guarantee that a DMA address is also a bus address?

This depends on whether there is an IOMMU, etc.

> In any case, this can be a separate patch. This one is good.
>
>
> Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>