[GIT PULL] Rust timekeeping for v6.17

[GIT PULL] Rust timekeeping for v6.17

[Andreas Hindborg]

Hi Miguel,

Please pull these changes for Rust timekeeping.

This batch of changes makes `Instant` generic over the clock source.
`HrTimer` also gets the generic treatment, allowing the API to type
check the time stamps passed to the API, to statically check whether a
relative or absolute time is required.

We also have a fix for 32-bit divisions on 64-bit architectures.

The commits have been in linux-next for at least a week.

The following changes since commit e04c78d86a9699d136910cfc0bdcf01087e3267e:

  Linux 6.16-rc2 (2025-06-15 13:49:41 -0700)

are available in the Git repository at:

  ssh://github.com/Rust-for-Linux/linux.git tags/rust-timekeeping-for-v6.17

for you to fetch changes up to d4b29ddf82a458935f1bd4909b8a7a13df9d3bdc:

  rust: time: Add wrapper for fsleep() function (2025-06-30 13:22:05 +0200)


Best regards,
Andreas Hindborg



----------------------------------------------------------------
rust-timekeeping for v6.17

----------------------------------------------------------------
FUJITA Tomonori (10):
      rust: time: Avoid 64-bit integer division on 32-bit architectures
      rust: time: Replace ClockId enum with ClockSource trait
      rust: time: Make Instant generic over ClockSource
      rust: time: Add ktime_get() to ClockSource trait
      rust: time: Replace HrTimerMode enum with trait-based mode types
      rust: time: Add HrTimerExpires trait
      rust: time: Make HasHrTimer generic over HrTimerMode
      rust: time: Remove Ktime in hrtimer
      rust: time: Seal the HrTimerMode trait
      rust: time: Add wrapper for fsleep() function

 rust/helpers/helpers.c              |   1 +
 rust/helpers/time.c                 |  35 +++++
 rust/kernel/time.rs                 | 233 ++++++++++++++++++----------
 rust/kernel/time/delay.rs           |  49 ++++++
 rust/kernel/time/hrtimer.rs         | 302 ++++++++++++++++++++++++------------
 rust/kernel/time/hrtimer/arc.rs     |   8 +-
 rust/kernel/time/hrtimer/pin.rs     |   8 +-
 rust/kernel/time/hrtimer/pin_mut.rs |   8 +-
 rust/kernel/time/hrtimer/tbox.rs    |   8 +-
 9 files changed, 466 insertions(+), 186 deletions(-)
 create mode 100644 rust/helpers/time.c
 create mode 100644 rust/kernel/time/delay.rs

Re: [GIT PULL] Rust timekeeping for v6.17

[Miguel Ojeda]

On Mon, Jul 7, 2025 at 9:47 AM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>
> ----------------------------------------------------------------
> rust-timekeeping for v6.17
>
> ----------------------------------------------------------------

The description is empty -- could you please provide a bit of text?

No need to send a new PR, since I know you may be away from your usual
office these days -- I can copy it from email.

(Worst case, I will write something myself, but there is still time.)

Thanks!

Cheers,
Miguel

Re: [GIT PULL] Rust timekeeping for v6.17

[Andreas Hindborg]

Hi Miguel,

"Miguel Ojeda" <miguel.ojeda.sandonis@gmail.com> writes:

> On Mon, Jul 7, 2025 at 9:47 AM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>>
>> ----------------------------------------------------------------
>> rust-timekeeping for v6.17
>>
>> ----------------------------------------------------------------
>
> The description is empty -- could you please provide a bit of text?
>
> No need to send a new PR, since I know you may be away from your usual
> office these days -- I can copy it from email.
>
> (Worst case, I will write something myself, but there is still time.)
>

Sorry for the missing tag text. Let me know if you can use the following
bullets:

 - Make `Instant` generic over clock source. This allows the compiler to
   assert that arithmetic expressions involving the `Instant` use
   `Instants` based on the same clock source.
 - Make `HrTimer` generic over the timer mode. `HrTimer` timers take a
   `Duration` or an `Instant` when setting the expiry time, depending on the
   timer mode. With this change, the compiler can check the type matches the
   timer mode.
 - Add an abstraction for `fsleep`. `fsleep` is a flexible sleep function that
   will select an appropriate sleep method depending on the requested sleep
   time.
 - Avoid 64-bit divisions on 32-bit hardware when calculating timestamps.
 - Seal the `HrTimerMode` trait. This prevents users of the
   `HrTimerMode` from implementing the trait on their own types.


Best regards,
Andreas Hindborg

Re: [GIT PULL] Rust timekeeping for v6.17

[Miguel Ojeda]

On Tue, Jul 15, 2025 at 9:58 AM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>
> Sorry for the missing tag text. Let me know if you can use the following
> bullets:
>
>  - Make `Instant` generic over clock source. This allows the compiler to
>    assert that arithmetic expressions involving the `Instant` use
>    `Instants` based on the same clock source.
>  - Make `HrTimer` generic over the timer mode. `HrTimer` timers take a
>    `Duration` or an `Instant` when setting the expiry time, depending on the
>    timer mode. With this change, the compiler can check the type matches the
>    timer mode.
>  - Add an abstraction for `fsleep`. `fsleep` is a flexible sleep function that
>    will select an appropriate sleep method depending on the requested sleep
>    time.
>  - Avoid 64-bit divisions on 32-bit hardware when calculating timestamps.
>  - Seal the `HrTimerMode` trait. This prevents users of the
>    `HrTimerMode` from implementing the trait on their own types.

No worries at all, looks good, thanks!

Cheers,
Miguel

Re: [GIT PULL] Rust timekeeping for v6.17

[Miguel Ojeda]

On Mon, Jul 7, 2025 at 9:47 AM Andreas Hindborg <a.hindborg@kernel.org> wrote:
>
> Please pull these changes for Rust timekeeping.

Merged into `rust-next` -- thank you!

(I applied the related fix on top.)

Cheers,
Miguel