Rust timekeeping for v7.1

Hi Miguel,

Pleas pull these changes for rust timekeeping.

This PR expands the example section of HrTimer, adds a constructor for Delta and marks ClockSource as unsafe to ensure only valid values are returned by ClockSource::ktime_get.

The following changes since commit c369299895a591d96745d6492d4888259b004a9e:

Linux 7.0-rc5 (2026-03-22 14:42:17 -0700)

are available in the Git repository at:

https://github.com/rust-for-linux/linux.git tags/rust-timekeeping-for-v7.1

for you to fetch changes up to ddb1444d3335129ae87d9796ab1debf41c0ee51b:

hrtimer: add usage examples to documentation (2026-03-23 08:31:00 +0100)

----------------------------------------------------------------
Rust timekeeping changes for v7.1

- Expand the example section in the HrTimer documentation.

- Mark the ClockSource trait as unsafe to ensure valid values for ktime_get().

- Add Delta::from_nanos().

----------------------------------------------------------------
Andreas Hindborg (1):
hrtimer: add usage examples to documentation

FUJITA Tomonori (1):
rust: time: make ClockSource unsafe trait

Lyude Paul (1):
rust/time: Add Delta::from_nanos()

 rust/kernel/time.rs         |  32 ++++-
 rust/kernel/time/hrtimer.rs | 336 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 362 insertions(+), 6 deletions(-)

Merged into rust-next -- thanks!

As discussed offline, this counts as a back merge, so let's avoid it in the future unless justified. For this time around, I provided this context in the merge commit:

This is a back merge since the pull request has a newer base -- we will avoid that in the future.

And, given it is a back merge, it happens to resolve the "subtle" conflict around '--remap-path-{prefix,scope}' that I discussed in linux-next [1], plus a few other common conflicts. The result matches what we did for next-20260407.

The actual diffstat (i.e. using a temporary merge of upstream first) is:

rust/kernel/time.rs | 32 ++++-
rust/kernel/time/hrtimer.rs | 336
++++++++++++++++++++++++++++++++++++++++++++

        2 files changed, 362 insertions(+), 6 deletions(-)

    Link: https://lore.kernel.org/linux-next/CANiq72kdxB=W3_CV1U44oOK3SssztPo2wLDZt6LP94TEO+Kj4g@mail.gmail.com/

[1]

* tag 'rust-timekeeping-for-v7.1' of
https://github.com/Rust-for-Linux/linux:
hrtimer: add usage examples to documentation
rust: time: make ClockSource unsafe trait rust/time: Add Delta::from_nanos()

Cheers,
Miguel