linux-kernel - Re: [PATCH net-next v3 2/8] rust: time: Introduce Delta type

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Message-ID: <CAH5fLgirVk+9aiJGgXe=ikT0i3XKEiXSSPVQr4ZUD+0sKrU6ew@mail.gmail.com>
Date: Wed, 16 Oct 2024 10:23:49 +0200
From: Alice Ryhl <aliceryhl@...gle.com>
To: FUJITA Tomonori <fujita.tomonori@...il.com>
Cc: netdev@...r.kernel.org, rust-for-linux@...r.kernel.org, andrew@...n.ch, 
	hkallweit1@...il.com, tmgross@...ch.edu, ojeda@...nel.org, 
	alex.gaynor@...il.com, gary@...yguo.net, bjorn3_gh@...tonmail.com, 
	benno.lossin@...ton.me, a.hindborg@...sung.com, anna-maria@...utronix.de, 
	frederic@...nel.org, tglx@...utronix.de, arnd@...db.de, jstultz@...gle.com, 
	sboyd@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 2/8] rust: time: Introduce Delta type

On Wed, Oct 16, 2024 at 5:53 AM FUJITA Tomonori
<fujita.tomonori@...il.com> 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.

Is there a reason that Delta wraps i64 directly instead of wrapping
the Ktime type? I'd like to see the reason in the commit message.

Alice