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Introduce the `HrTimerExpires` trait to represent types that can be used as expiration values for high-resolution timers. Define a required method, `into_nanos()`, which returns the expiration time as a raw nanosecond value suitable for use with C's hrtimer APIs. Also extend the `HrTimerMode` to use the `HrTimerExpires` trait. This refactoring is a preparation for enabling hrtimer code to work uniformly with both absolute and relative expiration modes. Reviewed-by: Andreas Hindborg <a.hindborg@kernel.org> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com> Link: https://lore.kernel.org/r/20250610132823.3457263-4-fujita.tomonori@gmail.com [ changed conversion method names to `as_*` - Andreas ] Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>