linux-kernel - Re: [PATCH 02/10] rust: xarray: add debug format for `StoreError`

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Message-ID: <CAJ-ks9kmLJaRfS2TGiah3U6kW2kELKGnMmhfLOfe7-GfBfMTBw@mail.gmail.com>
Date: Mon, 29 Dec 2025 10:58:42 -0500
From: Tamir Duberstein <tamird@...il.com>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Benno Lossin <lossin@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
	Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>, Daniel Gomez <da.gomez@...nel.org>, 
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 02/10] rust: xarray: add debug format for `StoreError`

On Wed, Dec 3, 2025 at 5:27 PM Andreas Hindborg <a.hindborg@...nel.org> wrote:
>
> Add a `Debug` implementation for `StoreError<T>` to enable better error
> reporting and debugging. The implementation only displays the `error`
> field and omits the `value` field, as `T` may not implement `Debug`.
>
> Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
> ---
>  rust/kernel/xarray.rs | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/rust/kernel/xarray.rs b/rust/kernel/xarray.rs
> index 88625c9abf4ef..d9762c6bef19c 100644
> --- a/rust/kernel/xarray.rs
> +++ b/rust/kernel/xarray.rs
> @@ -193,6 +193,14 @@ pub struct StoreError<T> {
>      pub value: T,
>  }
>
> +impl<T> core::fmt::Debug for StoreError<T> {
> +    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
> +        f.debug_struct("StoreError")
> +            .field("error", &self.error)
> +            .finish()
> +    }
> +}
> +
>  impl<T> From<StoreError<T>> for Error {
>      fn from(value: StoreError<T>) -> Self {
>          value.error
>
> --
> 2.51.2
>
>

FYI there's a nice suggestion here:
https://stackoverflow.com/questions/78870773/skip-struct-field-when-deriving-debug

Acked-by: Tamir Duberstein <tamird@...il.com>