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: <20241017.161050.543382913045883751.fujita.tomonori@gmail.com>
Date: Thu, 17 Oct 2024 16:10:50 +0900 (JST)
From: FUJITA Tomonori <fujita.tomonori@...il.com>
To: aliceryhl@...gle.com
Cc: 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, 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,
}