From: Ralf Jung <post@ralfj.de>
To: "Christian Schrefl" <chrisi.schrefl@gmail.com>,
"Benno Lossin" <lossin@kernel.org>, Sky <sky@sky9.dev>,
"Miguel Ojeda" <ojeda@kernel.org>,
"Alex Gaynor" <alex.gaynor@gmail.com>,
"Boqun Feng" <boqun.feng@gmail.com>,
"Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <benno.lossin@proton.me>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Gerald Wisböck" <gerald.wisboeck@feather.ink>
Cc: linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org
Subject: Re: [PATCH v2 1/3] rust: add UnsafePinned type
Date: Fri, 2 May 2025 11:00:09 +0200 [thread overview]
Message-ID: <03dbef12-cecc-473e-8fb0-c736061f3e04@ralfj.de> (raw)
In-Reply-To: <d5e8e635-08c4-4d3d-99a8-27f3b3a2153b@gmail.com>
Hi all,
>> If you have a link to somewhere that explains that hack, then I'd also
>> put it there. I forgot if it's written down somewhere.
>
> I haven't found anything that describes the hack in detail.
> From what I understand its a combination of disabling `noalias`
> [0] (this PR enables it for `Unpin` types) and disabling
> `dereferencable` [1] on `&mut !Unpin` types.
> Related rust issue about this [2].
>
> Maybe Alice, Ralf or someone else form the rust side can provide
> a better reference?
The `!Unpick` hack simply removes `noalias` and `dereferenceable` from `&mut
!Unpin` and `Box<!Unpin>` types (similar to how we already remove `noalias` and
`dereferenceable` from `&!Freeze` types). This is not a stable guarantee and
will probably change in future version of the compiler.
Kind regards,
Ralf
next prev parent reply other threads:[~2025-05-02 9:00 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-30 8:36 [PATCH v2 0/3] rust: add `UnsafePinned` type Christian Schrefl
2025-04-30 8:36 ` [PATCH v2 1/3] rust: add UnsafePinned type Christian Schrefl
2025-04-30 9:16 ` Alice Ryhl
2025-04-30 9:19 ` Alice Ryhl
2025-04-30 16:45 ` Christian Schrefl
2025-04-30 9:45 ` Benno Lossin
2025-04-30 17:30 ` Christian Schrefl
2025-05-01 18:51 ` Benno Lossin
2025-05-01 19:11 ` Christian Schrefl
2025-05-01 22:51 ` Benno Lossin
2025-05-02 0:08 ` Christian Schrefl
2025-05-02 8:35 ` Alice Ryhl
2025-05-02 9:00 ` Ralf Jung [this message]
2025-05-01 17:12 ` Christian Schrefl
2025-05-01 18:55 ` Benno Lossin
2025-05-02 8:57 ` Ralf Jung
2025-04-30 8:36 ` [PATCH v2 2/3] rust: implement `Wrapper<T>` for `Opaque<T>` Christian Schrefl
2025-04-30 9:20 ` Alice Ryhl
2025-04-30 9:32 ` Benno Lossin
2025-04-30 8:36 ` [PATCH v2 3/3] rust: use `UnsafePinned` in the implementation of `Opaque` Christian Schrefl
2025-04-30 9:18 ` Alice Ryhl
2025-04-30 9:35 ` Benno Lossin
2025-04-30 16:44 ` Boqun Feng
2025-04-30 17:07 ` Christian Schrefl
2025-04-30 9:46 ` [PATCH v2 0/3] rust: add `UnsafePinned` type Benno Lossin
-- strict thread matches above, loose matches on Subject: below --
2025-01-31 15:08 [PATCH v2 0/3] rust: miscdevice: Add additional data to MiscDeviceRegistration Christian Schrefl
2025-01-31 15:08 ` [PATCH v2 1/3] rust: add UnsafePinned type Christian Schrefl
2025-03-26 20:26 ` Benno Lossin
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