From: Andreas Hindborg <a.hindborg@kernel.org>
To: Mike Lothian <mike@fireburn.co.uk>, rust-for-linux@vger.kernel.org
Cc: "Mike Lothian" <mike@fireburn.co.uk>,
"Boqun Feng" <boqun@kernel.org>,
"FUJITA Tomonori" <fujita.tomonori@gmail.com>,
"Frederic Weisbecker" <frederic@kernel.org>,
"Lyude Paul" <lyude@redhat.com>,
"Thomas Gleixner" <tglx@kernel.org>,
"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
"John Stultz" <jstultz@google.com>,
"Stephen Boyd" <sboyd@kernel.org>,
"Miguel Ojeda" <ojeda@kernel.org>, "Gary Guo" <gary@garyguo.net>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Alice Ryhl" <aliceryhl@google.com>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Daniel Almeida" <daniel.almeida@collabora.com>,
"Tamir Duberstein" <tamird@kernel.org>,
"Alexandre Courbot" <acourbot@nvidia.com>,
"Onur Özkan" <work@onurozkan.dev>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 9/9] rust: time: add ktime_get_real_seconds
Date: Thu, 27 Aug 2026 15:39:53 +0200 [thread overview]
Message-ID: <877blb1y3a.fsf@kernel.org> (raw)
In-Reply-To: <20260826162851.2497-10-mike@fireburn.co.uk>
"Mike Lothian" <mike@fireburn.co.uk> writes:
> Reading an `Instant<RealTime>` is the wrong tool for a caller that only
> wants a calendar time in seconds: it takes a full nanosecond timestamp and
> then needs a 64-bit division to get back to what the timekeeping core
> already maintains as a plain seconds field.
>
> Wrap `ktime_get_real_seconds()`, which is that field. Document the property
> that matters at the call site and that the type cannot express: the value
> follows CLOCK_REALTIME, so it is not monotonic and can move in either
> direction.
We recently added the concept of `TimeUnit`. For now it is exposed via
`Delta<U: TimeUnit>`. We could extend this to `Instant` as well to have
a seconds based `Instant`.
Best regards,
Andreas Hindborg
next prev parent reply other threads:[~2026-08-28 7:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-08-26 16:28 [PATCH 0/9] rust: core abstractions for a USB display driver Mike Lothian
2026-08-26 16:28 ` [PATCH 1/9] rust: sync: completion: add single-shot and timed operations Mike Lothian
2026-08-26 16:28 ` [PATCH 2/9] rust: hrtimer: add ArcHrTimerHandle::restart Mike Lothian
2026-08-27 13:27 ` Andreas Hindborg
2026-08-26 16:28 ` [PATCH 3/9] rust: random: add a safe get_random_bytes wrapper Mike Lothian
2026-08-26 16:28 ` [PATCH 4/9] rust: xxhash: add a safe xxh64 wrapper Mike Lothian
2026-08-26 16:28 ` [PATCH 5/9] rust: workqueue: make OwnedQueue thread-safe Mike Lothian
2026-08-26 16:28 ` [PATCH 6/9] rust: io: add checked offset copy helpers Mike Lothian
2026-08-26 16:28 ` [PATCH 7/9] rust: hrtimer: expose interrupt state in hard callbacks Mike Lothian
2026-08-27 13:34 ` Andreas Hindborg
2026-08-26 16:28 ` [PATCH 8/9] rust: error: expose EPROTO Mike Lothian
2026-08-26 16:34 ` Miguel Ojeda
2026-08-26 16:28 ` [PATCH 9/9] rust: time: add ktime_get_real_seconds Mike Lothian
2026-08-27 13:39 ` Andreas Hindborg [this message]
2026-08-26 16:54 ` [PATCH 0/9] rust: core abstractions for a USB display driver Miguel Ojeda
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