linux-kernel - Re: [PATCH v3 2/2] samples: rust: add sample code for scatterlist abstraction

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Message-Id: <DBJA3N5Y07XL.D3SGP2VFJZ01@nvidia.com>
Date: Wed, 23 Jul 2025 17:07:08 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Daniel Almeida" <daniel.almeida@...labora.com>, "Abdiel Janulgue"
 <abdiel.janulgue@...il.com>
Cc: <dakr@...nel.org>, <jgg@...pe.ca>, <lyude@...hat.com>, "Miguel Ojeda"
 <ojeda@...nel.org>, "Alex Gaynor" <alex.gaynor@...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>, "Alice
 Ryhl" <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>, "Tamir
 Duberstein" <tamird@...il.com>, "FUJITA Tomonori"
 <fujita.tomonori@...il.com>, "open list" <linux-kernel@...r.kernel.org>,
 "Andrew Morton" <akpm@...ux-foundation.org>, "Randy Dunlap"
 <rdunlap@...radead.org>, "Herbert Xu" <herbert@...dor.apana.org.au>, "Caleb
 Sander Mateos" <csander@...estorage.com>, "Petr Tesarik"
 <petr@...arici.cz>, "Sui Jingfeng" <sui.jingfeng@...ux.dev>, "Marek
 Szyprowski" <m.szyprowski@...sung.com>, "Robin Murphy"
 <robin.murphy@....com>, <airlied@...hat.com>, "open list:DMA MAPPING
 HELPERS" <iommu@...ts.linux.dev>, <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH v3 2/2] samples: rust: add sample code for scatterlist
 abstraction

On Wed Jul 23, 2025 at 9:54 AM JST, Daniel Almeida wrote:
<snip>
>> +struct WrappedArc(Arc<kernel::bindings::sg_table>);
>> +impl core::borrow::Borrow<kernel::bindings::sg_table> for WrappedArc {
>> +    fn borrow(&self) -> &kernel::bindings::sg_table {
>> +        &self.0
>> +    }
>> }
>
> I assume there is no way to get around this without compromising somewhere
> else, right?

This should be undeeded now that [1] is in rust-next. `Arc` should now
be usable directly for the same purpose.

[1] https://lore.kernel.org/rust-for-linux/20250616-borrow_impls-v4-2-36f9beb3fe6a@nvidia.com/