linux-kernel - Re: [PATCH v2 4/4] rust: devres: implement register

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Message-Id: <DATCV8XFK7TO.2MYZKKA28JEQV@kernel.org>
Date: Sun, 22 Jun 2025 22:47:55 +0200
From: "Benno Lossin" <lossin@...nel.org>
To: "Danilo Krummrich" <dakr@...nel.org>, <gregkh@...uxfoundation.org>,
 <rafael@...nel.org>, <ojeda@...nel.org>, <alex.gaynor@...il.com>,
 <boqun.feng@...il.com>, <gary@...yguo.net>, <bjorn3_gh@...tonmail.com>,
 <a.hindborg@...nel.org>, <aliceryhl@...gle.com>, <tmgross@...ch.edu>,
 <david.m.ertman@...el.com>, <ira.weiny@...el.com>, <leon@...nel.org>,
 <kwilczynski@...nel.org>, <bhelgaas@...gle.com>
Cc: <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-pci@...r.kernel.org>
Subject: Re: [PATCH v2 4/4] rust: devres: implement register_release()

On Sun Jun 22, 2025 at 6:40 PM CEST, Danilo Krummrich wrote:
> +impl<T: Release> Release for crate::sync::ArcBorrow<'_, T> {
> +    fn release(&self) {
> +        self.deref().release();
> +    }
> +}
> +
> +impl<T: Release> Release for Pin<&'_ T> {

You don't need the `'_` here.

> +    fn release(&self) {
> +        self.deref().release();
> +    }
> +}

I still think we're missing a `impl<T: Release> Release for &T`.

And maybe a closure design is better, depending on how much code is
usually run in `release`, if it's a lot, then we should use the trait
design. If it's only 1-5 lines, then a closure would also be fine. I
don't have a strong preference, but if it's mostly one liners, then
closures would be better.

If you keep the trait design & we resolve the `&T: Release` question:

Reviewed-by: Benno Lossin <lossin@...nel.org>

---
Cheers,
Benno