linux-kernel - Re: [PATCH v2] rust: alloc: allow coercion from `Box<T>` to `Box<dyn U>` if T implements U

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Message-Id: <D94A8YFTQQ7Z.3RSIVKEESEDZD@nvidia.com>
Date: Sat, 12 Apr 2025 10:52:08 +0900
From: "Alexandre Courbot" <acourbot@...dia.com>
To: "Danilo Krummrich" <dakr@...nel.org>
Cc: "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" <benno.lossin@...ton.me>,
 "Andreas Hindborg" <a.hindborg@...nel.org>, "Alice Ryhl"
 <aliceryhl@...gle.com>, "Trevor Gross" <tmgross@...ch.edu>,
 <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] rust: alloc: allow coercion from `Box<T>` to
 `Box<dyn U>` if T implements U

On Fri Apr 11, 2025 at 11:22 PM JST, Danilo Krummrich wrote:
> On Fri, Apr 11, 2025 at 10:26:23PM +0900, Alexandre Courbot wrote:
>> On Fri Apr 11, 2025 at 10:10 PM JST, Danilo Krummrich wrote:
>> > On Fri, Apr 11, 2025 at 09:07:26PM +0900, Alexandre Courbot wrote:
>> >> This enables the creation of trait objects backed by a Box, similarly to
>> >> what can be done with the standard library.
>> >> 
>> >> Suggested-by: Benno Lossin <benno.lossin@...ton.me>
>> >> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
>> >
>> > I assume you have a specific use-case in nova-core for this? For this cycle, can
>> > you get away without having this in nova-core?
>> 
>> That's correct, and our next nova-core iteration will likely depend on
>> this to provide some basic HAL. If this cannot make it for this cycle, I
>> guess I can always use Arc temporarily.
>
> I'd prefer to take this through the alloc tree (for this cycle), but this also
> means you can't use it until the next cycle in nova. I assume that's just a
> minor inconvinience?

Yes, taking it through the alloc tree is fine, I will just work things
around (or delay the Falcon HAL, it's not like nova-core is going to be
anything useful in 6.16 anyway ^_^;) for the next cycle.

Thanks!
Alex.