linux-kernel - Re: [PATCH v5 05/23] rust: num: add the `fls` operation

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Message-ID: <CANiq72=3nDR=J2OXu9nWwZW_kcWfZ4KhZ3aS12_dcB=1EP2icQ@mail.gmail.com>
Date: Sun, 15 Jun 2025 11:37:21 +0200
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Alexandre Courbot <acourbot@...dia.com>
Cc: Miguel Ojeda <ojeda@...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>, 
	Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, David Airlie <airlied@...il.com>, 
	Simona Vetter <simona@...ll.ch>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, 
	Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>, 
	Benno Lossin <lossin@...nel.org>, John Hubbard <jhubbard@...dia.com>, Ben Skeggs <bskeggs@...dia.com>, 
	Joel Fernandes <joelagnelf@...dia.com>, Timur Tabi <ttabi@...dia.com>, 
	Alistair Popple <apopple@...dia.com>, linux-kernel@...r.kernel.org, 
	rust-for-linux@...r.kernel.org, nouveau@...ts.freedesktop.org, 
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v5 05/23] rust: num: add the `fls` operation

On Thu, Jun 12, 2025 at 4:02 PM Alexandre Courbot <acourbot@...dia.com> wrote:
>
> +            /// ```
> +            /// use kernel::num::fls_u32;
> +            ///
> +            /// assert_eq!(fls_u32(0x0), 0);
> +            /// assert_eq!(fls_u32(0x1), 1);
> +            /// assert_eq!(fls_u32(0x10), 5);
> +            /// assert_eq!(fls_u32(0xffff), 16);
> +            /// assert_eq!(fls_u32(0x8000_0000), 32);
> +            /// ```

For a future patch series: this could provide examples per type
(passing them in the `impl_fls!` call).

I can create a good first issue if this lands and it is not somewhere already.

Cheers,
Miguel