linux-kernel - Re: [PATCH v2 0/2] Add Opaque::cast

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Message-ID: <CANiq72kyhTMkZxizgL0Uu1NEbeGP=G09VP+Evb47mg4FyxZJZQ@mail.gmail.com>
Date: Thu, 17 Jul 2025 00:49:32 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, 
	Miguel Ojeda <ojeda@...nel.org>, Danilo Krummrich <dakr@...nel.org>, 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>, 
	Trevor Gross <tmgross@...ch.edu>, dri-devel@...ts.freedesktop.org, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 0/2] Add Opaque::cast_from

On Tue, Jun 24, 2025 at 5:28 PM Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> Since commit b20fbbc08a36 ("rust: check type of `$ptr` in
> `container_of!`") we have enforced that the field pointer passed to
> container_of! must match the declared field. This caused mismatches when
> using a pointer to bindings::x for fields of type Opaque<bindings::x>.
>
> This situation encourages the user to simply pass field.cast() to the
> container_of! macro, but this is not great because you might
> accidentally pass a *mut bindings::y when the field type is
> Opaque<bindings::x>, which would be wrong.
>
> To help catch this kind of mistake, add a new Opaque::cast_from that
> wraps a raw pointer in Opaque without changing the inner type. Also
> rename raw_get() to cast_into() for naming consistency.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Applied (yesterday) to `rust-next` -- thanks everyone!

    [ Removed `HrTimer::raw_get` change. - Miguel ]

Cheers,
Miguel