linux-kernel - Re: [PATCH] rust: update `dbg!()` to format column number

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Date: Wed, 17 Apr 2024 14:50:58 +0100
From: Gary Guo <gary@...yguo.net>
To: <dev@...yte.com>
Cc: <ojeda@...nel.org>, <alex.gaynor@...il.com>, <wedsonaf@...il.com>,
 <boqun.feng@...il.com>, <bjorn3_gh@...tonmail.com>,
 <benno.lossin@...ton.me>, <a.hindborg@...sung.com>, <aliceryhl@...gle.com>,
 <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rust: update `dbg!()` to format column number

On Sun, 14 Apr 2024 18:49:28 +0530
<dev@...yte.com> wrote:

> In Rust 1.76.0, the `dbg!()` macro was updated to also format the column
> number. The reason cited was usage of a few characters worth of
> horizontal space while allowing direct jumps to the source location. [1]
> 
> Link: https://github.com/rust-lang/rust/pull/114962 [1]
> Link: https://github.com/Rust-for-Linux/linux/issues/1065
> 
> Signed-off-by: Raghav Narang <dev@...yte.com>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  Branch rust-next 
> 
>  rust/kernel/std_vendor.rs | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/rust/kernel/std_vendor.rs b/rust/kernel/std_vendor.rs
> index 388d6a514..39679a960 100644
> --- a/rust/kernel/std_vendor.rs
> +++ b/rust/kernel/std_vendor.rs
> @@ -146,15 +146,16 @@ macro_rules! dbg {
>      // `$val` expression could be a block (`{ .. }`), in which case the `pr_info!`
>      // will be malformed.
>      () => {
> -        $crate::pr_info!("[{}:{}]\n", ::core::file!(), ::core::line!())
> +        $crate::pr_info!("[{}:{}:{}]\n", ::core::file!(), ::core::line!(), ::core::column!())
>      };
>      ($val:expr $(,)?) => {
>          // Use of `match` here is intentional because it affects the lifetimes
>          // of temporaries - https://stackoverflow.com/a/48732525/1063961
>          match $val {
>              tmp => {
> -                $crate::pr_info!("[{}:{}] {} = {:#?}\n",
> -                    ::core::file!(), ::core::line!(), ::core::stringify!($val), &tmp);
> +                $crate::pr_info!("[{}:{}:{}] {} = {:#?}\n",
> +                    ::core::file!(), ::core::line!(), ::core::column!(),
> +                    ::core::stringify!($val), &tmp);
>                  tmp
>              }
>          }
> 
> base-commit: 8db31d3f3bd5dbc8cf3a22bba04b4b4add7f984e