linux-kernel - Re: [PATCH v2] rust: sync: add accessor for the lock behind a given guard

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Message-ID: <87h658p6kz.fsf@kloenk.dev>
Date: Wed, 05 Feb 2025 19:52:28 +0100
From: Fiona Behrens <me@...enk.dev>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>,  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>,  Trevor Gross
 <tmgross@...ch.edu>,  Peter Zijlstra <peterz@...radead.org>,  Ingo Molnar
 <mingo@...hat.com>,  Will Deacon <will@...nel.org>,  Waiman Long
 <longman@...hat.com>,  rust-for-linux@...r.kernel.org,
  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] rust: sync: add accessor for the lock behind a given
 guard

Alice Ryhl <aliceryhl@...gle.com> writes:

> Binder has some methods where the caller provides a lock guard, and
> Binder needs to be able to assert that the guard is associated with the
> right lock. To enable this, add an accessor to obtain a reference to the
> underlying lock that you can pass to `ptr::eq`.
>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

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

Thanks,
Fiona

> ---
> Changes in v2:
> - Rename to lock_ref() to avoid confusion with lock().
> - Rebase on v6.14-rc1.
> - Link to v1: https://lore.kernel.org/r/20250130-guard-get-lock-v1-1-8ed87899920a@google.com
> ---