rust: hrtimer: Add forward_now() to HrTimer and HrTimerCallbackContext

Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org>
Link: https://lore.kernel.org/r/20250821193259.964504-6-lyude@redhat.com
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

Author: Lyude

rust/kernel/time/hrtimer.rs

@@ -212,6 +212,17 @@ impl<T> HrTimer<T> {
         // valid `Self` that we have exclusive access to.
         unsafe { Self::raw_forward(this, now, interval) }
     }
+
+    /// Conditionally forward the timer.
+    ///
+    /// This is a variant of [`forward()`](Self::forward) that uses an interval after the current
+    /// time of the base clock for the [`HrTimer`].
+    pub fn forward_now(self: Pin<&mut Self>, interval: Delta) -> u64
+    where
+        T: HasHrTimer<T>,
+    {
+        self.forward(HrTimerInstant::<T>::now(), interval)
+    }
 }
 
 /// Implemented by pointer types that point to structs that contain a [`HrTimer`].
@@ -687,6 +698,14 @@ impl<'a, T: HasHrTimer<T>> HrTimerCallbackContext<'a, T> {
         // - By our type invariants, `self.0` always points to a valid `HrTimer<T>`
         unsafe { HrTimer::<T>::raw_forward(self.0.as_ptr(), now, interval) }
     }
+
+    /// Conditionally forward the timer.
+    ///
+    /// This is a variant of [`HrTimerCallbackContext::forward()`] that uses an interval after the
+    /// current time of the base clock for the [`HrTimer`].
+    pub fn forward_now(&mut self, duration: Delta) -> u64 {
+        self.forward(HrTimerInstant::<T>::now(), duration)
+    }
 }
 
 /// Use to implement the [`HasHrTimer<T>`] trait.