linux-kernel - [PATCH 0/5] rust: time: Add clock read support

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Date: Sun, 24 Mar 2024 15:33:34 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Alice Ryhl <aliceryhl@...gle.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Wedson Almeida Filho <wedsonaf@...il.com>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	benno.lossin@...ton.me,
	Andreas Hindborg <a.hindborg@...sung.com>,
	John Stultz <jstultz@...gle.com>,
	Stephen Boyd <sboyd@...nel.org>,
	Valentin Obst <kernel@...entinobst.de>
Subject: [PATCH 0/5] rust: time: Add clock read support

Hi Thomas,

This is an updated version of:

	https://lore.kernel.org/rust-for-linux/Zf2kio8NYG5DEgyY@tardis/	

where I'm trying to provide the same functionality of Alice's patch:

	https://lore.kernel.org/rust-for-linux/20240322-rust-ktime_ms_delta-v2-1-d98de1f7c282@google.com/

along with the lesson we learned from the previous discussion:

	https://lore.kernel.org/rust-for-linux/20230221-gpu-up-time-v1-1-bf8fe74b7f55@asahilina.net/
	https://lore.kernel.org/rust-for-linux/20230714-rust-time-v2-1-f5aed84218c4@asahilina.net/

There are three important types or traits (the design was mostly brought
from previous patches):

* Instant type: it's a generic type for timestamps, whose backend is
  just ktime_t, but it has a generic type to differentiate clocks.

* Clock trait: to read a clock, one must implement the `now` function,
  in this series, only CLOCK_MONOTONIC support is added.

* Duration type: it's a signed 64 bit value which represents the
  timedelta, I've considered making it unsigned, but I want the
  following code:

  	d = ts2 - ts1;
	ts = ts3 + d;

  to work even when ts2 < ts1, but I'm also OK to define it as an
  unsigned.

Let me know how you think about this.

Regards,
Boqun

Alice Ryhl (1):
  rust: time: Introduce Duration type

Boqun Feng (4):
  rust: time: doc: Add missing C header link to jiffies
  rust: time: Introduce clock reading framework
  rust: time: Support reading CLOCK_MONOTONIC
  rust: time: Add Instant::elapsed() for monotonic clocks

 rust/kernel/time.rs | 139 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 139 insertions(+)

-- 
2.44.0