linux-kernel - Re: [PATCH 3/6] rust: page: Make with_page_mapped() and with_pointer_into

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Message-ID: <87pljz4b42.fsf@kloenk.dev>
Date: Mon, 03 Feb 2025 10:43:25 +0100
From: Fiona Behrens <me@...enk.dev>
To: Asahi Lina <lina@...hilina.net>
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>,
  Jann Horn <jannh@...gle.com>,  Matthew Wilcox <willy@...radead.org>,
  Paolo Bonzini <pbonzini@...hat.com>,  Danilo Krummrich <dakr@...nel.org>,
  Wedson Almeida Filho <wedsonaf@...il.com>,  Valentin Obst
 <kernel@...entinobst.de>,  Andrew Morton <akpm@...ux-foundation.org>,
  linux-mm@...ck.org,  airlied@...hat.com,  Abdiel Janulgue
 <abdiel.janulgue@...il.com>,  rust-for-linux@...r.kernel.org,
  linux-kernel@...r.kernel.org,  asahi@...ts.linux.dev
Subject: Re: [PATCH 3/6] rust: page: Make with_page_mapped() and
 with_pointer_into_page() public

Asahi Lina <lina@...hilina.net> writes:

> Lets users do (unsafe) complex page read/write operations without having
> to repeatedly call into read_raw()/write_raw() (which may be expensive
> in some cases).
>
> The functions themselves are not unsafe, but they do take a closure that
> receives a raw pointer, so actually making the access requires unsafe
> code.
>
> Signed-off-by: Asahi Lina <lina@...hilina.net>

Reviewed-by: Fiona Behrens <me@...enk.dev>