linux-kernel - Re: [RFC 1/5] rust: sync: impl Display for {Unique,}Arc

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Date:   Sat, 04 Feb 2023 11:20:29 +0100
From:   Finn Behrens <fin@...ntec.com>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        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>,
        Vincenzo Palazzo <vincenzopalazzodev@...il.com>
Subject: Re: [RFC 1/5] rust: sync: impl Display for {Unique,}Arc



On 2 Feb 2023, at 0:22, Boqun Feng wrote:

> This allows printing the inner data of `Arc` and its friends if the
> inner data implements `Display`. It's useful for logging and debugging
> purpose.
>
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
Reviewed-by: Finn Behrens <fin@...ntec.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 519a6ec43644..fc680a4a795c 100644
> --- a/rust/kernel/sync/arc.rs
> +++ b/rust/kernel/sync/arc.rs
> @@ -22,6 +22,7 @@ use crate::{
>  };
>  use alloc::boxed::Box;
>  use core::{
> +    fmt,
>      marker::{PhantomData, Unsize},
>      mem::{ManuallyDrop, MaybeUninit},
>      ops::{Deref, DerefMut},
> @@ -522,3 +523,15 @@ impl<T: ?Sized> DerefMut for UniqueArc<T> {
>          unsafe { &mut self.inner.ptr.as_mut().data }
>      }
>  }
> +
> +impl<T: fmt::Display + ?Sized> fmt::Display for UniqueArc<T> {
> +    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
> +        fmt::Display::fmt(self.deref(), f)
> +    }
> +}
> +
> +impl<T: fmt::Display + ?Sized> fmt::Display for Arc<T> {
> +    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
> +        fmt::Display::fmt(self.deref(), f)
> +    }
> +}
> -- 
> 2.39.1