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rust: time: Add Instant::from_ktime()

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For implementing Rust bindings which can return a point in time.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250821193259.964504-7-lyude@redhat.com
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
This commit is contained in:
Lyude Paul 2025-08-21 15:32:46 -04:00 committed by Andreas Hindborg
parent ac0a7bd27f
commit 583802cc99
1 changed files with 23 additions and 0 deletions
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23
rust/kernel/time.rs
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@ -200,6 +200,29 @@ pub fn elapsed(&self) -> Delta {
pub(crate) fn as_nanos(&self) -> i64 {
self.inner
}
/// Create an [`Instant`] from a `ktime_t` without checking if it is non-negative.
///
/// # Panics
///
/// On debug builds, this function will panic if `ktime` is not in the range from 0 to
/// `KTIME_MAX`.
///
/// # Safety
///
/// The caller promises that `ktime` is in the range from 0 to `KTIME_MAX`.
#[expect(unused)]
#[inline]
pub(crate) unsafe fn from_ktime(ktime: bindings::ktime_t) -> Self {
debug_assert!(ktime >= 0);
// INVARIANT: Our safety contract ensures that `ktime` is in the range from 0 to
// `KTIME_MAX`.
Self {
inner: ktime,
_c: PhantomData,
}
}
}
impl<C: ClockSource> core::ops::Sub for Instant<C> {