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Message-ID: <CANiq72kR3YZv65NYPx+H57XO7T85kioMWMZajRnk7f+ru-3x+w@mail.gmail.com>
Date:   Thu, 10 Nov 2022 20:14:17 +0100
From:   Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:     Boqun Feng <boqun.feng@...il.com>
Cc:     Miguel Ojeda <ojeda@...nel.org>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        patches@...ts.linux.dev, Niklas Mohrin <dev@...lasmohrin.de>
Subject: Re: [PATCH v1 23/28] rust: std_vendor: add `dbg!` macro based on
 `std`'s one

On Thu, Nov 10, 2022 at 7:02 PM Boqun Feng <boqun.feng@...il.com> wrote:
>
> and I'm almost convinced ;-) Better add the gist of discussion into
> comment/document/commit log? Users need to know when to use `dbg!` and
> when to use `pr_debug!`, right?

The docs talk about it a bit:

    +/// Note that the macro is intended as a debugging tool and therefore you
    +/// should avoid having uses of it in version control for long periods
    +/// (other than in tests and similar).

That is the original wording from the standard library, but we can
definitely make the rules more concrete on our end with something
like:

    `dbg!` is intended as a temporary debugging tool to be used during
    development. Therefore, avoid committing `dbg!` macro invocations
    into the kernel tree.

    For debug output that is intended to be kept, use `pr_debug!` and
    similar facilities instead.

Cheers,
Miguel

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