linux-kernel - Re: [PATCH 2/2] rust: arc: remove `ArcBorrow` in favour of `WithRef`

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Message-ID: <20230923081604.6e2de521@gary-lowrisc-laptop>
Date:   Sat, 23 Sep 2023 08:16:04 +0800
From:   Gary Guo <gary@...yguo.net>
To:     Alice Ryhl <aliceryhl@...gle.com>
Cc:     Wedson Almeida Filho <wedsonaf@...il.com>,
        rust-for-linux@...r.kernel.org, Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Boqun Feng <boqun.feng@...il.com>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Benno Lossin <benno.lossin@...ton.me>,
        Andreas Hindborg <a.hindborg@...sung.com>,
        linux-kernel@...r.kernel.org,
        Wedson Almeida Filho <walmeida@...rosoft.com>
Subject: Re: [PATCH 2/2] rust: arc: remove `ArcBorrow` in favour of
 `WithRef`

On Fri, 22 Sep 2023 17:29:58 +0200
Alice Ryhl <aliceryhl@...gle.com> wrote:

> On Thu, Sep 21, 2023 at 11:35 PM Wedson Almeida Filho
> <wedsonaf@...il.com> wrote:
> >
> > From: Wedson Almeida Filho <walmeida@...rosoft.com>
> >
> > With GATs, we don't need a separate type to represent a borrowed object
> > with a refcount, we can just use Rust's regular shared borrowing. In
> > this case, we use `&WithRef<T>` instead of `ArcBorrow<'_, T>`.
> >
> > Co-developed-by: Boqun Feng <boqun.feng@...il.com>
> > Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> > Signed-off-by: Wedson Almeida Filho <walmeida@...rosoft.com>  
> 
> I wonder whether "WithArc" is a better name? After all, arc is short
> for "atomic refcount".
> I also think it's nice to include Arc in the name of the type.
> 
> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>

Or just call it with `WithRc` -- we don't use `aloc::rc::Rc` in the
kernel so there's no need to emphasis that this one is atomic :)

I personally think the `WithRef` name is fine, we have a smart pointer
called `ARef` after all :)

Best,
Gary