linux-kernel - Re: [PATCH v4 4/7] rust: num: add `into

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Message-Id: <DG0C68O25Y9X.2X8M9OXMW17IS@garyguo.net>
Date: Wed, 28 Jan 2026 15:43:47 +0000
From: "Gary Guo" <gary@...yguo.net>
To: "Alexandre Courbot" <acourbot@...dia.com>, "Danilo Krummrich"
 <dakr@...nel.org>, "Alice Ryhl" <aliceryhl@...gle.com>, "Daniel Almeida"
 <daniel.almeida@...labora.com>, "Miguel Ojeda" <ojeda@...nel.org>, "Boqun
 Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Benno Lossin"
 <lossin@...nel.org>, "Andreas Hindborg" <a.hindborg@...nel.org>, "Trevor
 Gross" <tmgross@...ch.edu>
Cc: "Yury Norov" <yury.norov@...il.com>, "John Hubbard"
 <jhubbard@...dia.com>, "Alistair Popple" <apopple@...dia.com>, "Joel
 Fernandes" <joelagnelf@...dia.com>, "Timur Tabi" <ttabi@...dia.com>, "Edwin
 Peer" <epeer@...dia.com>, "Eliot Courtney" <ecourtney@...dia.com>, "Dirk
 Behme" <dirk.behme@...bosch.com>, "Steven Price" <steven.price@....com>,
 <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 4/7] rust: num: add `into_inner` method to `Bounded`

On Wed Jan 28, 2026 at 2:37 AM GMT, Alexandre Courbot wrote:
> This is useful to access the inner value in const contexts.
>
> Signed-off-by: Alexandre Courbot <acourbot@...dia.com>
> ---
>  rust/kernel/num/bounded.rs | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
>
> diff --git a/rust/kernel/num/bounded.rs b/rust/kernel/num/bounded.rs
> index b41ca6df1525..850827033f67 100644
> --- a/rust/kernel/num/bounded.rs
> +++ b/rust/kernel/num/bounded.rs
> @@ -388,6 +388,22 @@ pub fn get(self) -> T {
>          *self.deref()
>      }
>  
> +    /// Returns the wrapped value as the backing type.
> +    ///
> +    /// This is a const-friendly variant of [`Self::get`] that can be used in const contexts.
> +    ///
> +    /// # Examples
> +    ///
> +    /// ```
> +    /// use kernel::num::Bounded;
> +    ///
> +    /// const V: u32 = Bounded::<u32, 4>::new::<7>().into_inner();
> +    /// assert_eq!(V, 7u32);
> +    /// ```
> +    pub const fn into_inner(self) -> T {
> +        self.0
> +    }

This is... just `get`.

You can implement it (with the `fits_with_in` check) in the same manner as the
const new.

Best,
Gary

> +
>      /// Increases the number of bits usable for `self`.
>      ///
>      /// This operation cannot fail.