netdev - Re: [PATCH net-next v3 3/8] rust: time: Change output of Ktime's sub operation to Delta

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Message-ID: <CAH5fLgiPztunRXrEKF1=sCB16QfbFhQ19p_EorA2f1Xnfu3-zA@mail.gmail.com>
Date: Thu, 17 Oct 2024 10:22:20 +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 3/8] rust: time: Change output of Ktime's sub
 operation to Delta

On Thu, Oct 17, 2024 at 9:11 AM FUJITA Tomonori
<fujita.tomonori@...il.com> wrote:
>
> On Wed, 16 Oct 2024 10:25:11 +0200
> Alice Ryhl <aliceryhl@...gle.com> wrote:
>
> > On Wed, Oct 16, 2024 at 5:53 AM FUJITA Tomonori
> > <fujita.tomonori@...il.com> wrote:
> >>
> >> Change the output type of Ktime's subtraction operation from Ktime to
> >> Delta. Currently, the output is Ktime:
> >>
> >> Ktime = Ktime - Ktime
> >>
> >> It means that Ktime is used to represent timedelta. Delta is
> >> introduced so use it. A typical example is calculating the elapsed
> >> time:
> >>
> >> Delta = current Ktime - past Ktime;
> >>
> >> Signed-off-by: FUJITA Tomonori <fujita.tomonori@...il.com>
> >
> > So this means that you are repurposing Ktime as a replacement for
> > Instant rather than making both a Delta and Instant type? Okay. That
> > seems reasonable enough.
>
> Yes.
>
> Surely, we could create both Delta and Instant. What is Ktime used
> for? Both can simply use bindings::ktime_t like the followings?
>
> pub struct Instant {
>     inner: bindings::ktime_t,
> }
>
> pub struct Delta {
>     inner: bindings::ktime_t,
> }

What you're doing is okay. No complaints.

Alice