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: <ZxAYRthmAIHfW5c2@Boquns-Mac-mini.local>
Date: Wed, 16 Oct 2024 12:47:18 -0700
From: Boqun Feng <boqun.feng@...il.com>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, 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 Wed, Oct 16, 2024 at 10:25:11AM +0200, Alice Ryhl 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.
> 

I think it's still reasonable to introduce a `Instant<ClockSource>` type
(based on `Ktime`) to avoid some mis-uses, but we can do that in the
future.

Regards,
Boqun

> Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>
> 
> Alice
>