linux-kernel - Re: [RFC 4/5] rust: sync: impl Debug for {Unique,}Arc

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Date:   Sat, 04 Feb 2023 19:56:22 +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 4/5] rust: sync: impl Debug for {Unique,}Arc

On Thu Feb 2, 2023 at 12:22 AM CET, Boqun Feng wrote:
> This allows printing macros to print the data and the refcount nubmer
> of these struct for debugging purposes.
>
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> ---
Reviwed-by: Vincenzo Palazzo <vincenzopalazzodev@...il.com>

>  rust/kernel/sync/arc.rs | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>
> diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
> index 4d8de20c996f..f143d8305c36 100644
> --- a/rust/kernel/sync/arc.rs
> +++ b/rust/kernel/sync/arc.rs
> @@ -474,6 +474,7 @@ impl<T: ?Sized> Deref for ArcBorrow<'_, T> {
>  ///
>  /// # test().unwrap();
>  /// ```
> +#[derive(Debug)]
>  pub struct UniqueArc<T: ?Sized> {
>      inner: Arc<T>,
>  }
> @@ -545,3 +546,15 @@ impl<T: fmt::Display + ?Sized> fmt::Display for Arc<T> {
>          fmt::Display::fmt(self.deref(), f)
>      }
>  }
> +
> +impl<T: fmt::Debug + ?Sized> fmt::Debug for Arc<T> {
> +    /// Formats debug output for [`Arc`].
> +    ///
> +    /// Refcount is also printed for debugging purpose.
> +    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
> +        f.debug_struct("Arc")
> +            .field("refcount", &self.get_inner().count())
> +            .field("data", &self.deref())
> +            .finish()
> +    }
> +}
> -- 
> 2.39.1