linux-kernel - Re: [PATCH v6 01/14] rust: time: Add Ktime::from

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Message-ID: <CAJ-ks9nwiWo0T5rQdQEMGg-9X1oEQVfTa6HY+Jan6aTwtsuSFg@mail.gmail.com>
Date: Tue, 14 Jan 2025 12:04:10 -0500
From: Tamir Duberstein <tamird@...il.com>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Anna-Maria Behnsen <anna-maria@...utronix.de>, 
	Frederic Weisbecker <frederic@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, 
	Danilo Krummrich <dakr@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <benno.lossin@...ton.me>, Alice Ryhl <aliceryhl@...gle.com>, 
	Trevor Gross <tmgross@...ch.edu>, Lyude Paul <lyude@...hat.com>, Guangbo Cui <2407018371@...com>, 
	Dirk Behme <dirk.behme@...il.com>, Daniel Almeida <daniel.almeida@...labora.com>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 01/14] rust: time: Add Ktime::from_ns()

On Fri, Jan 10, 2025 at 3:20 PM Andreas Hindborg <a.hindborg@...nel.org> wrote:
>
> From: Lyude Paul <lyude@...hat.com>
>
> A simple function to turn the provided value in nanoseconds into a Ktime
> value. We allow any type which implements Into<bindings::ktime_t>, which
> resolves to Into<i64>.
>
> This is useful for some of the older DRM APIs that never got moved to Ktime

Missing period.

> Signed-off-by: Lyude Paul <lyude@...hat.com>
> Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
> ---
>  rust/kernel/time.rs | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
> index 379c0f5772e575c9ceacb9c85255b13501db8f30..f59e0fea79d3acfddd922f601f569353609aeec1 100644
> --- a/rust/kernel/time.rs
> +++ b/rust/kernel/time.rs
> @@ -8,6 +8,8 @@
>  //! C header: [`include/linux/jiffies.h`](srctree/include/linux/jiffies.h).
>  //! C header: [`include/linux/ktime.h`](srctree/include/linux/ktime.h).
>
> +use core::convert::Into;
> +
>  /// The number of nanoseconds per millisecond.
>  pub const NSEC_PER_MSEC: i64 = bindings::NSEC_PER_MSEC as i64;
>
> @@ -63,6 +65,12 @@ pub fn to_ns(self) -> i64 {
>      pub fn to_ms(self) -> i64 {
>          self.divns_constant::<NSEC_PER_MSEC>()
>      }
> +
> +    /// Creates a new Ktime from the given duration in nanoseconds
> +    #[inline]
> +    pub fn from_ns(ns: impl Into<bindings::ktime_t>) -> Self {
> +        Self { inner: ns.into() }
> +    }
>  }

Should this be called `from_nanos` to be consistent with
`core::time::Duration::from_nanos`?

>
>  /// Returns the number of milliseconds between two ktimes.
>
> --
> 2.47.0