linux-kernel - Re: [PATCH 2/8] rust: debugfs: Bind file creation for long-lived Display

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Message-ID: <2025043006-snowflake-headless-e417@gregkh>
Date: Wed, 30 Apr 2025 09:55:24 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Matthew Maurer <mmaurer@...gle.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>,
	Benno Lossin <benno.lossin@...ton.me>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Danilo Krummrich <dakr@...nel.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH 2/8] rust: debugfs: Bind file creation for long-lived
 Display

On Tue, Apr 29, 2025 at 11:15:56PM +0000, Matthew Maurer wrote:
> +    /// Create a file in a DebugFS directory with the provided name, and contents from invoking
> +    /// [`Display::fmt`] on the provided reference.
> +    ///
> +    /// # Example
> +    ///
> +    /// ```
> +    /// # use kernel::c_str;
> +    /// # use kernel::debugfs::Dir;
> +    /// let dir = Dir::new(c_str!("my_debugfs_dir"), None)?;

Again, can never fail, so don't check it.

> +    /// let file = dir.display_file(c_str!("foo"), &200)?;

Again, can never fail, so don't check it.

And "200" is wrong, did you test these?


> +    /// # Ok::<(), Error>(())
> +    /// ```
> +    pub fn display_file<T: Display + Sized>(
> +        &self,
> +        name: &CStr,
> +        data: &'static T,
> +    ) -> Result<ARef<Self>> {

Again, will always succeed, you don't want any checking of Result<>

thanks,

greg k-h