linux-kernel - Re: [RFC 5/5] sample: rust: print: Add sampe code for Arc printing

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Message-Id: <CQA0H2Z1SGIG.I9OPJD8ADX24@vincent>
Date:   Sat, 04 Feb 2023 20:05:03 +0100
From:   "Vincenzo Palazzo" <vincenzopalazzodev@...il.com>
To:     "Boqun Feng" <boqun.feng@...il.com>,
        <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Cc:     "Will Deacon" <will@...nel.org>,
        "Peter Zijlstra" <peterz@...radead.org>,
        "Mark Rutland" <mark.rutland@....com>,
        "Miguel Ojeda" <ojeda@...nel.org>,
        "Alex Gaynor" <alex.gaynor@...il.com>,
        "Wedson Almeida Filho" <wedsonaf@...il.com>,
        "Gary Guo" <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>
Subject: Re: [RFC 5/5] sample: rust: print: Add sampe code for Arc printing

On Thu Feb 2, 2023 at 12:22 AM CET, Boqun Feng wrote:
> This both demonstrates the usage of different print format in Rust and
> serves as a selftest for the `Display` and `Debug` implementation of
> `Arc` and its friends.
>
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> ---
Reviwed-by: Vincenzo Palazzo <vincenzopalazzodev@...il.com>

>  samples/rust/rust_print.rs | 26 ++++++++++++++++++++++++++
>  1 file changed, 26 insertions(+)
>
> diff --git a/samples/rust/rust_print.rs b/samples/rust/rust_print.rs
> index 8b39d9cef6d1..165a8d7b1c07 100644
> --- a/samples/rust/rust_print.rs
> +++ b/samples/rust/rust_print.rs
> @@ -15,6 +15,30 @@ module! {
>  
>  struct RustPrint;
>  
> +fn arc_print() -> Result {
> +    use kernel::sync::*;
> +
> +    let a = Arc::try_new(1)?;
> +    let b = UniqueArc::try_new("hello, world")?;
> +
> +    // Prints the value of data in `a`.
> +    pr_info!("{}", a);
> +
> +    // Uses ":?" to print debug fmt of `b`.
> +    pr_info!("{:?}", b);
> +
> +    let a: Arc<&str> = b.into();
> +    let c = a.clone();
> +
> +    // Uses `dbg` to print, will move `c`.
> +    dbg!(c);
> +
> +    // Prints debug fmt with pretty-print "#" and number-in-hex "x".
> +    pr_info!("{:#x?}", a);
> +
> +    Ok(())
> +}
> +
>  impl kernel::Module for RustPrint {
>      fn init(_module: &'static ThisModule) -> Result<Self> {
>          pr_info!("Rust printing macros sample (init)\n");
> @@ -43,6 +67,8 @@ impl kernel::Module for RustPrint {
>          pr_cont!(" is {}", "continued");
>          pr_cont!(" with {}\n", "args");
>  
> +        arc_print()?;
> +
>          Ok(RustPrint)
>      }
>  }
> -- 
> 2.39.1