From: Andreas Hindborg <a.hindborg@kernel.org>
To: Gary Guo <gary@garyguo.net>, Oliver Mangold <oliver.mangold@pm.me>
Cc: "Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Benno Lossin" <lossin@kernel.org>,
"Danilo Krummrich" <dakr@kernel.org>,
"Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
"Dave Ertman" <david.m.ertman@intel.com>,
"Ira Weiny" <ira.weiny@intel.com>,
"Leon Romanovsky" <leon@kernel.org>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Maarten Lankhorst" <maarten.lankhorst@linux.intel.com>,
"Maxime Ripard" <mripard@kernel.org>,
"Thomas Zimmermann" <tzimmermann@suse.de>,
"David Airlie" <airlied@gmail.com>,
"Simona Vetter" <simona@ffwll.ch>,
"Alexander Viro" <viro@zeniv.linux.org.uk>,
"Christian Brauner" <brauner@kernel.org>,
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"Lorenzo Stoakes" <lorenzo.stoakes@oracle.com>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
"Viresh Kumar" <vireshk@kernel.org>, "Nishanth Menon" <nm@ti.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Krzysztof Wilczyński" <kwilczynski@kernel.org>,
"Paul Moore" <paul@paul-moore.com>,
"Serge Hallyn" <sergeh@kernel.org>,
"Asahi Lina" <lina+kernel@asahilina.net>,
rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-block@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-pm@vger.kernel.org, linux-pci@vger.kernel.org,
linux-security-module@vger.kernel.org
Subject: Re: [PATCH v13 2/4] rust: `AlwaysRefCounted` is renamed to `RefCounted`.
Date: Mon, 02 Feb 2026 10:48:39 +0100 [thread overview]
Message-ID: <87wm0vpjbc.fsf@t14s.mail-host-address-is-not-set> (raw)
In-Reply-To: <20251201160030.6956a834.gary@garyguo.net>
Gary Guo <gary@garyguo.net> writes:
> On Mon, 17 Nov 2025 10:07:57 +0000
> Oliver Mangold <oliver.mangold@pm.me> wrote:
>
>> `AlwaysRefCounted` will become a marker trait to indicate that it is
>> allowed to obtain an `ARef<T>` from a `&T`, which cannot be allowed for
>> types which are also Ownable.
>
> The message needs a rationale for making the change rather than relying
> on the reader to deduce so.
>
> For example:
>
> There are types where it may both be referenced counted in some
> cases and owned in other. In such cases, obtaining `ARef<T>`
> from `&T` would be unsound as it allows creation of `ARef<T>`
> copy from `&Owned<T>`.
>
> Therefore, we split `AlwaysRefCounted` into `RefCounted` (which
> `ARef<T>` would require) and a marker trait to indicate that
> the type is always reference counted (and not `Ownable`) so the
> `&T` -> `ARef<T>` conversion is possible.
Thanks, I'll mix this in with the one I sent to Daniel.
Best regards,
Andreas Hindborg
next prev parent reply other threads:[~2026-02-02 10:06 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-17 10:07 [PATCH v13 0/4] New trait OwnableRefCounted for ARef<->Owned conversion Oliver Mangold
2025-11-17 10:07 ` [PATCH v13 1/4] rust: types: Add Ownable/Owned types Oliver Mangold
2025-11-28 15:09 ` Daniel Almeida
2026-02-02 9:14 ` Andreas Hindborg
2025-12-01 15:51 ` Gary Guo
2026-02-02 9:37 ` Andreas Hindborg
2026-02-02 12:29 ` Gary Guo
2026-02-02 13:04 ` Andreas Hindborg
2025-11-17 10:07 ` [PATCH v13 2/4] rust: `AlwaysRefCounted` is renamed to `RefCounted` Oliver Mangold
2025-11-28 17:46 ` Daniel Almeida
2026-02-02 9:46 ` Andreas Hindborg
2025-12-01 16:00 ` Gary Guo
2026-02-02 9:48 ` Andreas Hindborg [this message]
2025-11-17 10:08 ` [PATCH v13 3/4] rust: Add missing SAFETY documentation for `ARef` example Oliver Mangold
2025-11-28 17:50 ` Daniel Almeida
2026-02-02 9:52 ` Andreas Hindborg
2025-11-17 10:08 ` [PATCH v13 4/4] rust: Add `OwnableRefCounted` Oliver Mangold
2025-11-28 18:06 ` Daniel Almeida
2025-12-01 10:23 ` Oliver Mangold
2025-12-01 17:09 ` Miguel Ojeda
2026-02-02 10:06 ` Andreas Hindborg
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