Re: [PATCH] rust/time: Add Delta::from_nanos()

[Onur Özkan]

On Fri, 14 Nov 2025 13:42:06 -0500
Lyude Paul <lyude@xxxxxxxxxx> wrote:

> Since rvkms is going to need to create its own Delta instances, and we
> already have functions for creating Delta with every other unit of
> time.
> 
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
> ---
>  rust/kernel/time.rs | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/rust/kernel/time.rs b/rust/kernel/time.rs
> index 6ea98dfcd0278..2b096e5a61cda 100644
> --- a/rust/kernel/time.rs
> +++ b/rust/kernel/time.rs
> @@ -363,6 +363,12 @@ impl Delta {
>      /// A span of time equal to zero.
>      pub const ZERO: Self = Self { nanos: 0 };
>  
> +    /// Create a new [`Delta`] from a number of nanoseconds.
> +    #[inline]
> +    pub const fn from_nanos(nanos: i64) -> Self {
> +        Self { nanos }
> +    }
> +

I wonder if it makes sense to remove all the `from_*` functions from
`Delta` and replace them all with something like this:

    pub const fn from_duration(duration: Duration) -> Self {
        Self {
            nanos: duration.as_nanos(),
        }
    }

What do you think?

>      /// Create a new [`Delta`] from a number of microseconds.
>      ///
>      /// The `micros` can range from -9_223_372_036_854_775 to
> 9_223_372_036_854_775.
> 
> base-commit: 5935461b458463ee51aac8d95c25d7a5e1de8c4d