linux-kernel - Re: [PATCH v2 03/14] rust: sync: add `Arc::as

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Message-ID: <CAH5fLggudKg0x5jjOHxdSq4-m8x=OE7WM+uCtTCJKzG8rm37dg@mail.gmail.com>
Date: Mon, 23 Sep 2024 10:14:22 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: Gary Guo <gary@...yguo.net>
Cc: Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Anna-Maria Behnsen <anna-maria@...utronix.de>, Frederic Weisbecker <frederic@...nel.org>, 
	Thomas Gleixner <tglx@...utronix.de>, Boqun Feng <boqun.feng@...il.com>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 03/14] rust: sync: add `Arc::as_ptr`

On Sat, Sep 21, 2024 at 5:58 PM Gary Guo <gary@...yguo.net> wrote:
>
> On Thu, 19 Sep 2024 14:03:50 +0000
> Benno Lossin <benno.lossin@...ton.me> wrote:
>
> > On 18.09.24 00:27, Andreas Hindborg wrote:
> > > Add a method to get a pointer to the data contained in an `Arc`.
> > >
> > > Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
> > > ---
> > >  rust/kernel/sync/arc.rs | 8 ++++++++
> > >  1 file changed, 8 insertions(+)
> > >
> > > diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
> > > index 3673496c2363..a57ea3e2b44c 100644
> > > --- a/rust/kernel/sync/arc.rs
> > > +++ b/rust/kernel/sync/arc.rs
> > > @@ -258,6 +258,14 @@ pub fn into_raw(self) -> *const T {
> > >          unsafe { core::ptr::addr_of!((*ptr).data) }
> > >      }
> > >
> > > +    /// Return a raw pointer to the data in this arc.
> > > +    pub fn as_ptr(&self) -> *const T {
> >
> > I don't know if we have a convention for this, but shouldn't this be an
> > associated function? Because if `T` also has an `as_ptr` function, it
> > will be shadowed by this one.
>
> The usual Rust convention is usually that if `Deref` is implemented,
> then unless there's a good reason to do otherwise, associated function
> should be used.

The reason for this convention is that adding new &self methods on a
smart pointer is a breaking change, but we don't care about breaking
changes, so it doesn't fully apply to us.

Not that we shouldn't follow the convention, but it's not completely
clear to me either.

Alice