linux-kernel - Re: [PATCH v6 02/14] rust: hrtimer: introduce hrtimer support

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Message-ID: <8734gvl0hd.fsf@kernel.org>
Date: Mon, 03 Feb 2025 12:41:02 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: "Alice Ryhl" <aliceryhl@...gle.com>
Cc: "Miguel Ojeda" <ojeda@...nel.org>,  "Anna-Maria Behnsen"
 <anna-maria@...utronix.de>,  "Frederic Weisbecker" <frederic@...nel.org>,
  "Thomas Gleixner" <tglx@...utronix.de>,  "Danilo Krummrich"
 <dakr@...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>,
  "Trevor Gross" <tmgross@...ch.edu>,  "Lyude Paul" <lyude@...hat.com>,
  "Guangbo Cui" <2407018371@...com>,  "Dirk Behme" <dirk.behme@...il.com>,
  "Daniel Almeida" <daniel.almeida@...labora.com>,
  <rust-for-linux@...r.kernel.org>,  <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 02/14] rust: hrtimer: introduce hrtimer support

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

> On Fri, Jan 10, 2025 at 9:17 PM Andreas Hindborg <a.hindborg@...nel.org> wrote:
>>
>> This patch adds support for intrusive use of the hrtimer system. For now,
>> only one timer can be embedded in a Rust struct.
>>
>> The hrtimer Rust API is based on the intrusive style pattern introduced by
>> the Rust workqueue API.
>>
>> Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
>> +/// A timer backed by a C `struct hrtimer`.
>> +///
>> +/// # Invariants
>> +///
>> +/// * `self.timer` is initialized by `bindings::hrtimer_setup`.
>> +#[pin_data]
>> +#[repr(C)]
>> +pub struct HrTimer<U> {
>
> nit: We usually use repr(transparent) instead.

`HrTimer` will have an additional field later in the series, and
`transparent` will not work.

>
>> +    #[pin]
>> +    timer: Opaque<bindings::hrtimer>,
>> +    _t: PhantomData<U>,
>> +}
>> +
>> +// SAFETY: A `HrTimer` can be moved to other threads and used/dropped from there.
>> +unsafe impl<U> Send for HrTimer<U> {}
>> +
>> +// SAFETY: Timer operations are locked on C side, so it is safe to operate on a
>> +// timer from multiple threads
>> +unsafe impl<U> Sync for HrTimer<U> {}
>> +
>> +impl<T> HrTimer<T> {
>
> You are inconsistent with whether the generic parameter is called T or U.

Will fix.


Best regards,
Andreas Hindborg