linux-kernel - [PATCH v7 2/7] rust: hrtimer: Add HrTimerInstant

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Message-ID: <20250813224240.3799325-3-lyude@redhat.com>
Date: Wed, 13 Aug 2025 18:42:17 -0400
From: Lyude Paul <lyude@...hat.com>
To: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: Daniel Almeida <daniel.almeida@...labora.com>,
	Boqun Feng <boqun.feng@...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: [PATCH v7 2/7] rust: hrtimer: Add HrTimerInstant

Since we want to add HrTimer methods that can accept Instants, we will want
to make sure that for each method we are using the correct Clocksource for
the given HrTimer. This would get a bit overly-verbose, so add a simple
HrTimerInstant type-alias to handle this for us.

Signed-off-by: Lyude Paul <lyude@...hat.com>
Reviewed-by: Andreas Hindborg <a.hindborg@...nel.org>
Reviewed-by: Daniel Almeida <daniel.almeida@...labora.com>
---
 rust/kernel/time/hrtimer.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
index 6bfc0223f4f57..be1bad4aacaad 100644
--- a/rust/kernel/time/hrtimer.rs
+++ b/rust/kernel/time/hrtimer.rs
@@ -72,6 +72,11 @@
 use core::marker::PhantomData;
 use pin_init::PinInit;
 
+/// A type-alias to refer to the [`Instant<C>`] for a given `T` from [`HrTimer<T>`].
+///
+/// Where `C` is the [`ClockSource`] of the [`HrTimer`].
+pub type HrTimerInstant<T> = Instant<<<T as HasHrTimer<T>>::TimerMode as HrTimerMode>::Clock>;
+
 /// A timer backed by a C `struct hrtimer`.
 ///
 /// # Invariants
-- 
2.50.0