Add Ktime temporarily until hrtimer is refactored to use Instant and
Delta types.

Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
---
 rust/kernel/time/hrtimer.rs         | 18 +++++++++++++++++-
 rust/kernel/time/hrtimer/arc.rs     |  2 +-
 rust/kernel/time/hrtimer/pin.rs     |  2 +-
 rust/kernel/time/hrtimer/pin_mut.rs |  4 ++--
 rust/kernel/time/hrtimer/tbox.rs    |  2 +-
 5 files changed, 22 insertions(+), 6 deletions(-)

diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
index ce53f8579d18..17824aa0c0f3 100644
--- a/rust/kernel/time/hrtimer.rs
+++ b/rust/kernel/time/hrtimer.rs
@@ -68,10 +68,26 @@
 //! `start` operation.
 
 use super::ClockId;
-use crate::{prelude::*, time::Ktime, types::Opaque};
+use crate::{prelude::*, types::Opaque};
 use core::marker::PhantomData;
 use pin_init::PinInit;
 
+/// A Rust wrapper around a `ktime_t`.
+// NOTE: Ktime is going to be removed when hrtimer is converted to Instant/Delta.
+#[repr(transparent)]
+#[derive(Copy, Clone, PartialEq, PartialOrd, Eq, Ord)]
+pub struct Ktime {
+    inner: bindings::ktime_t,
+}
+
+impl Ktime {
+    /// Returns the number of nanoseconds.
+    #[inline]
+    pub fn to_ns(self) -> i64 {
+        self.inner
+    }
+}
+
 /// A timer backed by a C `struct hrtimer`.
 ///
 /// # Invariants
diff --git a/rust/kernel/time/hrtimer/arc.rs b/rust/kernel/time/hrtimer/arc.rs
index 4a984d85b4a1..ccf1e66e5b2d 100644
--- a/rust/kernel/time/hrtimer/arc.rs
+++ b/rust/kernel/time/hrtimer/arc.rs
@@ -5,10 +5,10 @@
 use super::HrTimerCallback;
 use super::HrTimerHandle;
 use super::HrTimerPointer;
+use super::Ktime;
 use super::RawHrTimerCallback;
 use crate::sync::Arc;
 use crate::sync::ArcBorrow;
-use crate::time::Ktime;
 
 /// A handle for an `Arc<HasHrTimer<T>>` returned by a call to
 /// [`HrTimerPointer::start`].
diff --git a/rust/kernel/time/hrtimer/pin.rs b/rust/kernel/time/hrtimer/pin.rs
index f760db265c7b..293ca9cf058c 100644
--- a/rust/kernel/time/hrtimer/pin.rs
+++ b/rust/kernel/time/hrtimer/pin.rs
@@ -4,9 +4,9 @@
 use super::HrTimer;
 use super::HrTimerCallback;
 use super::HrTimerHandle;
+use super::Ktime;
 use super::RawHrTimerCallback;
 use super::UnsafeHrTimerPointer;
-use crate::time::Ktime;
 use core::pin::Pin;
 
 /// A handle for a `Pin<&HasHrTimer>`. When the handle exists, the timer might be
diff --git a/rust/kernel/time/hrtimer/pin_mut.rs b/rust/kernel/time/hrtimer/pin_mut.rs
index 90c0351d62e4..6033572d35ad 100644
--- a/rust/kernel/time/hrtimer/pin_mut.rs
+++ b/rust/kernel/time/hrtimer/pin_mut.rs
@@ -1,9 +1,9 @@
 // SPDX-License-Identifier: GPL-2.0
 
 use super::{
-    HasHrTimer, HrTimer, HrTimerCallback, HrTimerHandle, RawHrTimerCallback, UnsafeHrTimerPointer,
+    HasHrTimer, HrTimer, HrTimerCallback, HrTimerHandle, Ktime, RawHrTimerCallback,
+    UnsafeHrTimerPointer,
 };
-use crate::time::Ktime;
 use core::{marker::PhantomData, pin::Pin, ptr::NonNull};
 
 /// A handle for a `Pin<&mut HasHrTimer>`. When the handle exists, the timer might
diff --git a/rust/kernel/time/hrtimer/tbox.rs b/rust/kernel/time/hrtimer/tbox.rs
index 2071cae07234..29526a5da203 100644
--- a/rust/kernel/time/hrtimer/tbox.rs
+++ b/rust/kernel/time/hrtimer/tbox.rs
@@ -5,9 +5,9 @@
 use super::HrTimerCallback;
 use super::HrTimerHandle;
 use super::HrTimerPointer;
+use super::Ktime;
 use super::RawHrTimerCallback;
 use crate::prelude::*;
-use crate::time::Ktime;
 use core::ptr::NonNull;
 
 /// A handle for a [`Box<HasHrTimer<T>>`] returned by a call to
-- 
2.43.0