Re: [PATCH v9 3/8] rust: time: Introduce Delta type
From: Gary Guo <gary@garyguo.net>
Date: 2025-01-27 03:25:21
Also in:
lkml, rust-for-linux
On Sat, 25 Jan 2025 19:18:48 +0900 FUJITA Tomonori [off-list ref] wrote:
Introduce a type representing a span of time. Define our own type because `core::time::Duration` is large and could panic during creation. time::Ktime could be also used for time duration but timestamp and timedelta are different so better to use a new type. i64 is used instead of u64 to represent a span of time; some C drivers uses negative Deltas and i64 is more compatible with Ktime using i64 too (e.g., ktime_[us|ms]_delta() APIs return i64 so we create Delta object without type conversion. i64 is used instead of bindings::ktime_t because when the ktime_t type is used as timestamp, it represents values from 0 to KTIME_MAX, which is different from Delta. as_millis() method isn't used in this patchset. It's planned to be used in Binder driver. Reviewed-by: Andrew Lunn <andrew@lunn.ch> Reviewed-by: Alice Ryhl <aliceryhl@google.com> Signed-off-by: FUJITA Tomonori <fujita.tomonori@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
--- rust/kernel/time.rs | 88 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 88 insertions(+)