rust: hrtimer: implement `HrTimerPointer` for `Arc`

Allow the use of intrusive `hrtimer` fields in structs that are managed by
an `Arc` by implementing `HrTimerPointer` and `RawTimerCallbck` for `Arc`.

Acked-by: Frederic Weisbecker <frederic@kernel.org>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-3-73586e2bd5f1@kernel.org
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>

1 files changed, 3 insertions, 1 deletions

diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
index a3697622fa17..bfb536f2a490 100644
--- a/rust/kernel/time/hrtimer.rs
+++ b/rust/kernel/time/hrtimer.rs
@@ -150,7 +150,6 @@ impl<T> HrTimer<T> {
     /// # Safety
     ///
     /// `this` must point to a valid `Self`.
-    #[allow(dead_code)]
     pub(crate) unsafe fn raw_cancel(this: *const Self) -> bool {
         // SAFETY: `this` points to an allocation of at least `HrTimer` size.
         let c_timer_ptr = unsafe { HrTimer::raw_get(this) };
@@ -349,3 +348,6 @@ macro_rules! impl_has_hr_timer {
         }
     }
 }
+
+mod arc;
+pub use arc::ArcHrTimerHandle;