linux-kernel - Re: [PATCH v6 3/7] rust: hrtimer: Add HrTimer::raw

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Message-ID: <87jz3f70bq.fsf@kernel.org>
Date: Thu, 07 Aug 2025 15:01:13 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Daniel Almeida <daniel.almeida@...labora.com>, Lyude Paul
 <lyude@...hat.com>
Cc: rust-for-linux@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
 Boqun Feng <boqun.feng@...il.com>, linux-kernel@...r.kernel.org, FUJITA
 Tomonori <fujita.tomonori@...il.com>, Frederic Weisbecker
 <frederic@...nel.org>, Anna-Maria Behnsen <anna-maria@...utronix.de>, John
 Stultz <jstultz@...gle.com>, Stephen Boyd <sboyd@...nel.org>, Miguel Ojeda
 <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Gary Guo
 <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno
 Lossin <lossin@...nel.org>, Alice
 Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Danilo
 Krummrich <dakr@...nel.org>
Subject: Re: [PATCH v6 3/7] rust: hrtimer: Add HrTimer::raw_forward() and
 forward()

"Daniel Almeida" <daniel.almeida@...labora.com> writes:

> […]
>
>
>> +
>> +    /// Conditionally forward the timer.
>> +    ///
>> +    /// If the timer expires after `now`, this function does nothing and returns 0. If the timer
>> +    /// expired at or before `now`, this function forwards the timer by `interval` until the timer
>> +    /// expires after `now` and then returns the number of times the timer was forwarded by
>> +    /// `interval`.
>> +    ///
>> +    /// Returns the number of overruns that occurred as a result of the timer expiry change.
>> +    pub fn forward(self: Pin<&mut Self>, now: HrTimerInstant<T>, interval: Delta) -> u64
>> +    where
>> +        T: HasHrTimer<T>,
>> +    {
>> +        // SAFETY:
>> +        // - `raw_forward` does not move `self`.
>> +        // - Self is a mutable reference and thus always points to a valid `HrTimer`
>
> I get what you're trying to say, but IMHO using the word "mutable" here is
> confusing. Mutability has nothing to do on whether something is valid. This
> should be rephrased, IMHO.

Having a reference to something implies validity. We could do:

  The coertion of `&mut Self` to `*mut Self` results in a pointer to a
  valid `Self`.


Best regards,
Andreas Hindborg