mirror of
https://github.com/torvalds/linux.git
synced 2024-12-12 14:12:51 +00:00
bd9e54a42c
The Rust code documentation output path moved from `rust/doc` to
`Documentation/output/rust/rustdoc`, thus update the old reference.
Fixes: 48fadf4400 ("docs: Move rustdoc output, cross-reference it")
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Link: https://lore.kernel.org/r/20231018160145.1017340-1-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
80 lines
2.6 KiB
ReStructuredText
80 lines
2.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0
|
|
|
|
General Information
|
|
===================
|
|
|
|
This document contains useful information to know when working with
|
|
the Rust support in the kernel.
|
|
|
|
|
|
Code documentation
|
|
------------------
|
|
|
|
Rust kernel code is documented using ``rustdoc``, its built-in documentation
|
|
generator.
|
|
|
|
The generated HTML docs include integrated search, linked items (e.g. types,
|
|
functions, constants), source code, etc. They may be read at (TODO: link when
|
|
in mainline and generated alongside the rest of the documentation):
|
|
|
|
http://kernel.org/
|
|
|
|
The docs can also be easily generated and read locally. This is quite fast
|
|
(same order as compiling the code itself) and no special tools or environment
|
|
are needed. This has the added advantage that they will be tailored to
|
|
the particular kernel configuration used. To generate them, use the ``rustdoc``
|
|
target with the same invocation used for compilation, e.g.::
|
|
|
|
make LLVM=1 rustdoc
|
|
|
|
To read the docs locally in your web browser, run e.g.::
|
|
|
|
xdg-open Documentation/output/rust/rustdoc/kernel/index.html
|
|
|
|
To learn about how to write the documentation, please see coding-guidelines.rst.
|
|
|
|
|
|
Extra lints
|
|
-----------
|
|
|
|
While ``rustc`` is a very helpful compiler, some extra lints and analyses are
|
|
available via ``clippy``, a Rust linter. To enable it, pass ``CLIPPY=1`` to
|
|
the same invocation used for compilation, e.g.::
|
|
|
|
make LLVM=1 CLIPPY=1
|
|
|
|
Please note that Clippy may change code generation, thus it should not be
|
|
enabled while building a production kernel.
|
|
|
|
|
|
Abstractions vs. bindings
|
|
-------------------------
|
|
|
|
Abstractions are Rust code wrapping kernel functionality from the C side.
|
|
|
|
In order to use functions and types from the C side, bindings are created.
|
|
Bindings are the declarations for Rust of those functions and types from
|
|
the C side.
|
|
|
|
For instance, one may write a ``Mutex`` abstraction in Rust which wraps
|
|
a ``struct mutex`` from the C side and calls its functions through the bindings.
|
|
|
|
Abstractions are not available for all the kernel internal APIs and concepts,
|
|
but it is intended that coverage is expanded as time goes on. "Leaf" modules
|
|
(e.g. drivers) should not use the C bindings directly. Instead, subsystems
|
|
should provide as-safe-as-possible abstractions as needed.
|
|
|
|
|
|
Conditional compilation
|
|
-----------------------
|
|
|
|
Rust code has access to conditional compilation based on the kernel
|
|
configuration:
|
|
|
|
.. code-block:: rust
|
|
|
|
#[cfg(CONFIG_X)] // Enabled (`y` or `m`)
|
|
#[cfg(CONFIG_X="y")] // Enabled as a built-in (`y`)
|
|
#[cfg(CONFIG_X="m")] // Enabled as a module (`m`)
|
|
#[cfg(not(CONFIG_X))] // Disabled
|