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

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Date:   Fri, 3 Feb 2023 11:46:07 -0800
From:   Boqun Feng <boqun.feng@...il.com>
To:     Gary Guo <gary@...yguo.net>
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>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Vincenzo Palazzo <vincenzopalazzodev@...il.com>
Subject: Re: [RFC 4/5] rust: sync: impl Debug for {Unique,}Arc

On Thu, Feb 02, 2023 at 02:28:04PM +0000, Gary Guo wrote:
> On Wed,  1 Feb 2023 15:22:43 -0800
> Boqun Feng <boqun.feng@...il.com> 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>
> > ---
> >  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)]
> 
> I don't think this should be a `#[derive(Debug)]`. For `UniqueArc` the
> refcount field in `Arc` is useless, and we should just delegate the
> `Debug` impl to that of deref, just like `Display` does.
> 

I was just being lazy ;-) Will change this in v2.

Regards,
Boqun

> Best,
> Gary