linux-kernel - Re: [PATCH v17 1/3] rust: types: add `ForeignOwnable::PointedTo`

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Message-ID: <Z7SmMdl5Hl_CRAzs@pollux>
Date: Tue, 18 Feb 2025 16:24:33 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: Tamir Duberstein <tamird@...il.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Matthew Wilcox <willy@...radead.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	FUJITA Tomonori <fujita.tomonori@...il.com>,
	"Rob Herring (Arm)" <robh@...nel.org>,
	Maíra Canal <mcanal@...lia.com>,
	Asahi Lina <lina@...hilina.net>, rust-for-linux@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Subject: Re: [PATCH v17 1/3] rust: types: add `ForeignOwnable::PointedTo`

On Tue, Feb 18, 2025 at 09:37:43AM -0500, Tamir Duberstein wrote:
> Allow implementors to specify the foreign pointer type; this exposes
> information about the pointed-to type such as its alignment.
> 
> This requires the trait to be `unsafe` since it is now possible for
> implementors to break soundness by returning a misaligned pointer.
> 
> Encoding the pointer type in the trait (and avoiding pointer casts)
> allows the compiler to check that implementors return the correct
> pointer type. This is preferable to directly encoding the alignment in
> the trait using a constant as the compiler would be unable to check it.
> 
> Signed-off-by: Tamir Duberstein <tamird@...il.com>

Acked-by: Danilo Krummrich <dakr@...nel.org>