[PATCH] rust: time: Seal the HrTimerMode trait

[FUJITA Tomonori]

Prevent downstream crates or drivers from implementing `HrTimerMode`
for arbitrary types, which could otherwise leads to unsupported
behavior.

Introduce a `private::Sealed` trait and implement it for all types
that implement `HrTimerMode`.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@xxxxxxxxx>
---
 rust/kernel/time/hrtimer.rs | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/time/hrtimer.rs b/rust/kernel/time/hrtimer.rs
index a6468bc50e57..0028720cb4e9 100644
--- a/rust/kernel/time/hrtimer.rs
+++ b/rust/kernel/time/hrtimer.rs
@@ -442,8 +442,27 @@ fn into_nanos(self) -> i64 {
     }
 }
 
+mod private {
+    use crate::time::ClockSource;
+
+    pub trait Sealed {}
+
+    impl<C: ClockSource> Sealed for super::AbsoluteMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativeMode<C> {}
+    impl<C: ClockSource> Sealed for super::AbsolutePinnedMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativePinnedMode<C> {}
+    impl<C: ClockSource> Sealed for super::AbsoluteSoftMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativeSoftMode<C> {}
+    impl<C: ClockSource> Sealed for super::AbsolutePinnedSoftMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativePinnedSoftMode<C> {}
+    impl<C: ClockSource> Sealed for super::AbsoluteHardMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativeHardMode<C> {}
+    impl<C: ClockSource> Sealed for super::AbsolutePinnedHardMode<C> {}
+    impl<C: ClockSource> Sealed for super::RelativePinnedHardMode<C> {}
+}
+
 /// Operational mode of [`HrTimer`].
-pub trait HrTimerMode {
+pub trait HrTimerMode: private::Sealed {
     /// The C representation of hrtimer mode.
     const C_MODE: bindings::hrtimer_mode;
 

base-commit: 994393295c89711531583f6de8f296a30b0d944a
-- 
2.43.0