linux-kernel - Re: [PATCH v3 10/16] rust: add devres abstraction

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAH5fLgj1rd3b4aaMj8b6Rs77_t+LZApxK-dmP2gk98L-NjFyWw@mail.gmail.com>
Date: Thu, 31 Oct 2024 15:03:33 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Danilo Krummrich <dakr@...nel.org>
Cc: gregkh@...uxfoundation.org, rafael@...nel.org, bhelgaas@...gle.com, 
	ojeda@...nel.org, alex.gaynor@...il.com, boqun.feng@...il.com, 
	gary@...yguo.net, bjorn3_gh@...tonmail.com, benno.lossin@...ton.me, 
	tmgross@...ch.edu, a.hindborg@...sung.com, airlied@...il.com, 
	fujita.tomonori@...il.com, lina@...hilina.net, pstanner@...hat.com, 
	ajanulgu@...hat.com, lyude@...hat.com, robh@...nel.org, 
	daniel.almeida@...labora.com, saravanak@...gle.com, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
	linux-pci@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 10/16] rust: add devres abstraction

On Tue, Oct 22, 2024 at 11:33 PM Danilo Krummrich <dakr@...nel.org> wrote:
>
> Add a Rust abstraction for the kernel's devres (device resource
> management) implementation.
>
> The Devres type acts as a container to manage the lifetime and
> accessibility of device bound resources. Therefore it registers a
> devres callback and revokes access to the resource on invocation.
>
> Users of the Devres abstraction can simply free the corresponding
> resources in their Drop implementation, which is invoked when either the
> Devres instance goes out of scope or the devres callback leads to the
> resource being revoked, which implies a call to drop_in_place().
>
> Signed-off-by: Danilo Krummrich <dakr@...nel.org>

How is this intended to be used? Every single field I add of this type
is going to result in an additional synchronize_rcu() call in my
destructor. Those calls are pretty expensive.

Alice