Commit 583802cc authored by Lyude Paul's avatar Lyude Paul Committed by Andreas Hindborg
Browse files

rust: time: Add Instant::from_ktime() 



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

Signed-off-by: default avatarLyude Paul <lyude@redhat.com>
Reviewed-by: default avatarAndreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Reviewed-by: default avatarFUJITA Tomonori <fujita.tomonori@gmail.com>
Link: https://lore.kernel.org/r/20250821193259.964504-7-lyude@redhat.com


Signed-off-by: default avatarAndreas Hindborg <a.hindborg@kernel.org>
parent ac0a7bd2

rust/kernel/time.rs

+23 −0
Original line number Diff line number Diff line
@@ -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> {