linux/rust/kernel/time/hrtimer, branch v6.18

rust: hrtimer: Add HrTimerCallbackContext and ::forward()

2025-09-04T14:54:39Z

With Linux's hrtimer API, there's a number of methods that can only be called in two situations: * When we have exclusive access to the hrtimer and it is not currently active * When we're within the context of an hrtimer callback context This commit handles the second situation and implements hrtimer_forward() support in the context of a timer callback. We do this by introducing a HrTimerCallbackContext type which is provided to users during the RawHrTimerCallback::run() callback, and then add a forward() function to the type. Signed-off-by: Lyude Paul Reviewed-by: Daniel Almeida Reviewed-by: Andreas Hindborg Link: https://lore.kernel.org/r/20250821193259.964504-5-lyude@redhat.com Signed-off-by: Andreas Hindborg

Merge tag 'rust-timekeeping-for-v6.17' of https://github.com/Rust-for-Linux/linux into rust-next

2025-07-16T21:45:08Z

Pull timekeeping updates from Andreas Hindborg: - Make 'Instant' generic over clock source. This allows the compiler to assert that arithmetic expressions involving the 'Instant' use 'Instants' based on the same clock source. - Make 'HrTimer' generic over the timer mode. 'HrTimer' timers take a 'Duration' or an 'Instant' when setting the expiry time, depending on the timer mode. With this change, the compiler can check the type matches the timer mode. - Add an abstraction for 'fsleep'. 'fsleep' is a flexible sleep function that will select an appropriate sleep method depending on the requested sleep time. - Avoid 64-bit divisions on 32-bit hardware when calculating timestamps. - Seal the 'HrTimerMode' trait. This prevents users of the 'HrTimerMode' from implementing the trait on their own types. * tag 'rust-timekeeping-for-v6.17' of https://github.com/Rust-for-Linux/linux: rust: time: Add wrapper for fsleep() function rust: time: Seal the HrTimerMode trait rust: time: Remove Ktime in hrtimer rust: time: Make HasHrTimer generic over HrTimerMode rust: time: Add HrTimerExpires trait rust: time: Replace HrTimerMode enum with trait-based mode types rust: time: Add ktime_get() to ClockSource trait rust: time: Make Instant generic over ClockSource rust: time: Replace ClockId enum with ClockSource trait rust: time: Avoid 64-bit integer division on 32-bit architectures

rust: time: Make HasHrTimer generic over HrTimerMode

2025-06-24T17:52:47Z

Add a `TimerMode` associated type to the `HasHrTimer` trait to represent the operational mode of the timer, such as absolute or relative expiration. This new type must implement the `HrTimerMode` trait, which defines how expiration values are interpreted. Update the `start()` method to accept an `expires` parameter of type `::Expires` instead of the fixed `Ktime`. This enables different timer modes to provide strongly typed expiration values, such as `Instant` or `Delta`. The `impl_has_hr_timer` macro is also extended to allow specifying the `HrTimerMode`. In the following example, it guarantees that the `start()` method for `Foo` only accepts `Instant`. Using a `Delta` or an `Instant` with a different clock source will result in a compile-time error: struct Foo { #[pin] timer: HrTimer, } impl_has_hr_timer! { impl HasHrTimer for Foo { mode : AbsoluteMode, field : self.timer } } This design eliminates runtime mismatches between expires types and clock sources, and enables stronger type-level guarantees throughout hrtimer. Signed-off-by: FUJITA Tomonori Reviewed-by: Andreas Hindborg Link: https://lore.kernel.org/r/20250610132823.3457263-5-fujita.tomonori@gmail.com [ changed conversion method names to `as_*` - Andreas ] Signed-off-by: Andreas Hindborg

rust: enable `clippy::ptr_as_ptr` lint

2025-06-22T21:08:42Z

In Rust 1.51.0, Clippy introduced the `ptr_as_ptr` lint [1]: > Though `as` casts between raw pointers are not terrible, > `pointer::cast` is safer because it cannot accidentally change the > pointer's mutability, nor cast the pointer to other types like `usize`. There are a few classes of changes required: - Modules generated by bindgen are marked `#[allow(clippy::ptr_as_ptr)]`. - Inferred casts (` as _`) are replaced with `.cast()`. - Ascribed casts (` as *... T`) are replaced with `.cast::()`. - Multistep casts from references (` as *const _ as *const T`) are replaced with `core::ptr::from_ref(&x).cast()` with or without `::` according to the previous rules. The `core::ptr::from_ref` call is required because `(x as *const _).cast::()` results in inference failure. - Native literal C strings are replaced with `c_str!().as_char_ptr()`. - `*mut *mut T as _` is replaced with `let *mut *const T = (*mut *mut T)`.cast();` since pointer to pointer can be confusing. Apply these changes and enable the lint -- no functional change intended. Link: https://rust-lang.github.io/rust-clippy/master/index.html#ptr_as_ptr [1] Reviewed-by: Benno Lossin Reviewed-by: Boqun Feng Signed-off-by: Tamir Duberstein Acked-by: Viresh Kumar Acked-by: Greg Kroah-Hartman Acked-by: Tejun Heo Acked-by: Danilo Krummrich Link: https://lore.kernel.org/r/20250615-ptr-as-ptr-v12-1-f43b024581e8@gmail.com [ Added `.cast()` for `opp`. - Miguel ] Signed-off-by: Miguel Ojeda

rust: hrtimer: Add Ktime temporarily

2025-04-29T13:31:07Z

Add Ktime temporarily until hrtimer is refactored to use Instant and Delta types. Reviewed-by: Andreas Hindborg Reviewed-by: Boqun Feng Signed-off-by: FUJITA Tomonori Link: https://lore.kernel.org/r/20250423192857.199712-2-fujita.tomonori@gmail.com Signed-off-by: Andreas Hindborg

rust: hrtimer: implement `HrTimerPointer` for `Pin>`

2025-03-22T11:08:54Z

Allow `Pin>` to be the target of a timer callback. Acked-by: Frederic Weisbecker Acked-by: Thomas Gleixner Reviewed-by: Lyude Paul Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-10-73586e2bd5f1@kernel.org Signed-off-by: Andreas Hindborg

rust: hrtimer: implement `UnsafeHrTimerPointer` for `Pin<&mut T>`

2025-03-22T11:08:54Z

Allow pinned mutable references to structs that contain a `HrTimer` node to be scheduled with the `hrtimer` subsystem. Acked-by: Frederic Weisbecker Acked-by: Thomas Gleixner Reviewed-by: Lyude Paul Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-8-73586e2bd5f1@kernel.org Signed-off-by: Andreas Hindborg

rust: hrtimer: implement `UnsafeHrTimerPointer` for `Pin<&T>`

2025-03-22T11:08:54Z

Allow pinned references to structs that contain a `HrTimer` node to be scheduled with the `hrtimer` subsystem. Acked-by: Frederic Weisbecker Acked-by: Thomas Gleixner Reviewed-by: Lyude Paul Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-7-73586e2bd5f1@kernel.org Signed-off-by: Andreas Hindborg

rust: hrtimer: allow timer restart from timer handler

2025-03-22T11:08:54Z

Allow timer handlers to report that they want a timer to be restarted after the timer handler has finished executing. Acked-by: Frederic Weisbecker Acked-by: Thomas Gleixner Reviewed-by: Benno Lossin Reviewed-by: Tamir Duberstein Reviewed-by: Lyude Paul Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-4-73586e2bd5f1@kernel.org Signed-off-by: Andreas Hindborg

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

2025-03-11T20:00:42Z

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 Acked-by: Thomas Gleixner Reviewed-by: Lyude Paul Reviewed-by: Benno Lossin Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-3-73586e2bd5f1@kernel.org Signed-off-by: Andreas Hindborg