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

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Message-ID: <940d2002-650e-4e56-bc12-1aac2031e827@lunn.ch>
Date: Fri, 18 Oct 2024 18:55:53 +0200
From: Andrew Lunn <andrew@...n.ch>
To: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc: FUJITA Tomonori <fujita.tomonori@...il.com>, netdev@...r.kernel.org,
	rust-for-linux@...r.kernel.org, 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, aliceryhl@...gle.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 Fri, Oct 18, 2024 at 04:31:34PM +0200, Miguel Ojeda wrote:
> On Fri, Oct 18, 2024 at 3:50 PM Andrew Lunn <andrew@...n.ch> wrote:
> >
> > Wasn't there a comment that the code should always round up? Delaying
> > for 0 uS is probably not what the user wants.
> 
> This is not delaying, though, so I don't see why a method with this
> name should return a rounded up value.
> 
> Moreover, `ktime_to_us` doesn't round up. The standard library one
> doesn't, either.

Did you see my other comment, about not actually using these helpers?
I _guess_ it was not used because it does not in fact round up. So at
least for this patchset, the helpers are useless. Should we be adding
useless helpers? Or should we be adding useful helpers? Maybe these
helpers need a different name, and do actually round up?

	Andrew