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Date:   Thu, 02 Feb 2023 16:50:32 +0000
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To:     Boqun Feng <boqun.feng@gmail.com>
From:   =?utf-8?Q?Bj=C3=B6rn_Roy_Baron?= <bjorn3_gh@protonmail.com>
Cc:     rust-for-linux@vger.kernel.org, linux-kernel@vger.kernel.org,
        Will Deacon <will@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Miguel Ojeda <ojeda@kernel.org>,
        Alex Gaynor <alex.gaynor@gmail.com>,
        Wedson Almeida Filho <wedsonaf@gmail.com>,
        Gary Guo <gary@garyguo.net>,
        Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Subject: Re: [RFC 1/5] rust: sync: impl Display for {Unique,}Arc
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In-Reply-To: <20230201232244.212908-2-boqun.feng@gmail.com>
References: <20230201232244.212908-1-boqun.feng@gmail.com> <20230201232244.212908-2-boqun.feng@gmail.com>
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On Thursday, February 2nd, 2023 at 00:22, Boqun Feng <boqun.feng@gmail.com>=
 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.
>=20
> Signed-off-by: Boqun Feng <boqun.feng@gmail.com>

Reviewed-by: Bj=C3=B6rn Roy Baron <bjorn3_gh@protonmail.com>

>=20
> ---
>  rust/kernel/sync/arc.rs | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
>=20
> 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