Sometimes kernel developers use `//` for documenting private items,
since those do not get rendered at the moment.

That is reasonable, but the intention behind `///` (and `//!`) vs. `//`
is to convey the distinction between documentation and other kinds of
comments, such as implementation details or TODOs.

It also increases consistency with the public items and thus e.g. allows
to change visibility of an item with less changed involved.

It is not just useful for human readers, but also tooling. For instance,
we may want to eventually generate documentation for private items
(perhaps as a toggle in the HTML UI). On top of that, `rustdoc` lints
as usual for those, too, so we may want to do it even if we do not use
the result.

Thus document this explicitly.

Cc: Viresh Kumar <viresh.kumar@linaro.org>
Link: https://lore.kernel.org/rust-for-linux/CANiq72n_C7exSOMe5yf-7jKKnhSCv+a9QcD=OE2B_Q2UFBL3Xg@mail.gmail.com/
Link: https://github.com/Rust-for-Linux/linux/issues/1157
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 Documentation/rust/coding-guidelines.rst | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/Documentation/rust/coding-guidelines.rst b/Documentation/rust/coding-guidelines.rst
index 27f2a7bb5a4a..6c6c51b4cf46 100644
--- a/Documentation/rust/coding-guidelines.rst
+++ b/Documentation/rust/coding-guidelines.rst
@@ -85,6 +85,18 @@ written after the documentation, e.g.:
 	    // ...
 	}
 
+This applies to both public and private items. This increases consistency with
+public items, allows changes to visibility with less changes involved and will
+allow us to potentially generate the documentation for private items as well.
+In other words, if documentation is written for a private item, then ``///``
+should still be used. For instance:
+
+.. code-block:: rust
+
+	/// My private function.
+	// TODO: ...
+	fn f() {}
+
 One special kind of comments are the ``// SAFETY:`` comments. These must appear
 before every ``unsafe`` block, and they explain why the code inside the block is
 correct/sound, i.e. why it cannot trigger undefined behavior in any case, e.g.:

base-commit: c1b4071ec3a6a594df6c49bf8f04a60a88072525
-- 
2.49.0

On Wed, Apr 16, 2025 at 1:25 PM Miguel Ojeda <ojeda@kernel.org> wrote:
>
> Sometimes kernel developers use `//` for documenting private items,
> since those do not get rendered at the moment.
>
> That is reasonable, but the intention behind `///` (and `//!`) vs. `//`
> is to convey the distinction between documentation and other kinds of
> comments, such as implementation details or TODOs.
>
> It also increases consistency with the public items and thus e.g. allows
> to change visibility of an item with less changed involved.
>
> It is not just useful for human readers, but also tooling. For instance,
> we may want to eventually generate documentation for private items
> (perhaps as a toggle in the HTML UI). On top of that, `rustdoc` lints
> as usual for those, too, so we may want to do it even if we do not use
> the result.
>
> Thus document this explicitly.
>
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Link: https://lore.kernel.org/rust-for-linux/CANiq72n_C7exSOMe5yf-7jKKnhSCv+a9QcD=OE2B_Q2UFBL3Xg@mail.gmail.com/
> Link: https://github.com/Rust-for-Linux/linux/issues/1157
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Applied to `rust-next` -- thanks everyone!

    [ Fixed typo. - Miguel ]

Cheers,
Miguel

On 16-04-25, 13:24, Miguel Ojeda wrote:
> Sometimes kernel developers use `//` for documenting private items,
> since those do not get rendered at the moment.
> 
> That is reasonable, but the intention behind `///` (and `//!`) vs. `//`
> is to convey the distinction between documentation and other kinds of
> comments, such as implementation details or TODOs.
> 
> It also increases consistency with the public items and thus e.g. allows
> to change visibility of an item with less changed involved.

                                            changes ?

> It is not just useful for human readers, but also tooling. For instance,
> we may want to eventually generate documentation for private items
> (perhaps as a toggle in the HTML UI). On top of that, `rustdoc` lints
> as usual for those, too, so we may want to do it even if we do not use
> the result.
> 
> Thus document this explicitly.

Reviewed-by: Viresh Kumar <viresh.kumar@linaro.org>

-- 
viresh

On 16.04.25 1:24 PM, Miguel Ojeda wrote:
> Sometimes kernel developers use `//` for documenting private items,
> since those do not get rendered at the moment.
> 
> That is reasonable, but the intention behind `///` (and `//!`) vs. `//`
> is to convey the distinction between documentation and other kinds of
> comments, such as implementation details or TODOs.
> 
> It also increases consistency with the public items and thus e.g. allows
> to change visibility of an item with less changed involved.
> 
> It is not just useful for human readers, but also tooling. For instance,
> we may want to eventually generate documentation for private items
> (perhaps as a toggle in the HTML UI). On top of that, `rustdoc` lints
> as usual for those, too, so we may want to do it even if we do not use
> the result.
> 
> Thus document this explicitly.
> 
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Link: https://lore.kernel.org/rust-for-linux/CANiq72n_C7exSOMe5yf-7jKKnhSCv+a9QcD=OE2B_Q2UFBL3Xg@mail.gmail.com/
> Link: https://github.com/Rust-for-Linux/linux/issues/1157
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
> ---
Reviewed-by: Christian Schrefl <chrisi.schrefl@gmail.com>

On Wed, Apr 16, 2025 at 01:24:54PM +0200, Miguel Ojeda wrote:
> Sometimes kernel developers use `//` for documenting private items,
> since those do not get rendered at the moment.
> 
> That is reasonable, but the intention behind `///` (and `//!`) vs. `//`
> is to convey the distinction between documentation and other kinds of
> comments, such as implementation details or TODOs.
> 
> It also increases consistency with the public items and thus e.g. allows
> to change visibility of an item with less changed involved.
> 
> It is not just useful for human readers, but also tooling. For instance,
> we may want to eventually generate documentation for private items
> (perhaps as a toggle in the HTML UI). On top of that, `rustdoc` lints
> as usual for those, too, so we may want to do it even if we do not use
> the result.
> 
> Thus document this explicitly.
> 
> Cc: Viresh Kumar <viresh.kumar@linaro.org>
> Link: https://lore.kernel.org/rust-for-linux/CANiq72n_C7exSOMe5yf-7jKKnhSCv+a9QcD=OE2B_Q2UFBL3Xg@mail.gmail.com/
> Link: https://github.com/Rust-for-Linux/linux/issues/1157
> Signed-off-by: Miguel Ojeda <ojeda@kernel.org>

Reviewed-by: Alice Ryhl <aliceryhl@google.com>