2022-05-07 06:37:54

by Miguel Ojeda

Subject: [PATCH v6 18/23] docs: add Rust documentation

Most of the documentation for Rust is written within the source code
itself, as it is idiomatic for Rust projects. This applies to both
the shared infrastructure at `rust/` as well as any other Rust module
(e.g. drivers) written across the kernel.

However, these documents contain general information that does not
fit particularly well in the source code, like the Quick Start guide.

It also contains an asset (SVG logo) used for the `rustdoc` target
and a few other small changes elsewhere in the documentation folder.

Co-developed-by: Alex Gaynor <[email protected]>
Signed-off-by: Alex Gaynor <[email protected]>
Co-developed-by: Finn Behrens <[email protected]>
Signed-off-by: Finn Behrens <[email protected]>
Co-developed-by: Adam Bratschi-Kaye <[email protected]>
Signed-off-by: Adam Bratschi-Kaye <[email protected]>
Co-developed-by: Wedson Almeida Filho <[email protected]>
Signed-off-by: Wedson Almeida Filho <[email protected]>
Co-developed-by: Michael Ellerman <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Co-developed-by: Sven Van Asbroeck <[email protected]>
Signed-off-by: Sven Van Asbroeck <[email protected]>
Co-developed-by: Wu XiangCheng <[email protected]>
Signed-off-by: Wu XiangCheng <[email protected]>
Co-developed-by: Gary Guo <[email protected]>
Signed-off-by: Gary Guo <[email protected]>
Co-developed-by: Boris-Chengbiao Zhou <[email protected]>
Signed-off-by: Boris-Chengbiao Zhou <[email protected]>
Co-developed-by: Yuki Okushi <[email protected]>
Signed-off-by: Yuki Okushi <[email protected]>
Co-developed-by: Wei Liu <[email protected]>
Signed-off-by: Wei Liu <[email protected]>
Co-developed-by: Daniel Xu <[email protected]>
Signed-off-by: Daniel Xu <[email protected]>
Co-developed-by: Julian Merkle <[email protected]>
Signed-off-by: Julian Merkle <[email protected]>
Signed-off-by: Miguel Ojeda <[email protected]>
---
Documentation/doc-guide/kernel-doc.rst | 3 +
Documentation/index.rst | 1 +
Documentation/kbuild/kbuild.rst | 17 +
Documentation/kbuild/makefiles.rst | 50 ++-
Documentation/process/changes.rst | 41 +++
Documentation/rust/arch-support.rst | 34 ++
Documentation/rust/coding-guidelines.rst | 214 ++++++++++++
Documentation/rust/general-information.rst | 77 +++++
Documentation/rust/index.rst | 20 ++
Documentation/rust/logo.svg | 357 +++++++++++++++++++++
Documentation/rust/quick-start.rst | 230 +++++++++++++
11 files changed, 1040 insertions(+), 4 deletions(-)
create mode 100644 Documentation/rust/arch-support.rst
create mode 100644 Documentation/rust/coding-guidelines.rst
create mode 100644 Documentation/rust/general-information.rst
create mode 100644 Documentation/rust/index.rst
create mode 100644 Documentation/rust/logo.svg
create mode 100644 Documentation/rust/quick-start.rst

diff --git a/Documentation/doc-guide/kernel-doc.rst b/Documentation/doc-guide/kernel-doc.rst
index 79aaa55d6bcf..cde7aa67e76f 100644
--- a/Documentation/doc-guide/kernel-doc.rst
+++ b/Documentation/doc-guide/kernel-doc.rst
@@ -11,6 +11,9 @@ when it is embedded in source files.
reasons. The kernel source contains tens of thousands of kernel-doc
comments. Please stick to the style described here.

+.. note:: kernel-doc does not cover Rust code: please see
+ Documentation/rust/general-information.rst instead.
+
The kernel-doc structure is extracted from the comments, and proper
`Sphinx C Domain`_ function and type descriptions with anchors are
generated from them. The descriptions are filtered for special kernel-doc
diff --git a/Documentation/index.rst b/Documentation/index.rst
index 1988c19d9daf..ee639a500278 100644
--- a/Documentation/index.rst
+++ b/Documentation/index.rst
@@ -82,6 +82,7 @@ merged much easier.
maintainer/index
fault-injection/index
livepatch/index
+ rust/index


Kernel API documentation
diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
index ef19b9c13523..08f575e6236c 100644
--- a/Documentation/kbuild/kbuild.rst
+++ b/Documentation/kbuild/kbuild.rst
@@ -48,6 +48,10 @@ KCFLAGS
-------
Additional options to the C compiler (for built-in and modules).

+KRUSTFLAGS
+----------
+Additional options to the Rust compiler (for built-in and modules).
+
CFLAGS_KERNEL
-------------
Additional options for $(CC) when used to compile
@@ -57,6 +61,15 @@ CFLAGS_MODULE
-------------
Additional module specific options to use for $(CC).

+RUSTFLAGS_KERNEL
+----------------
+Additional options for $(RUSTC) when used to compile
+code that is compiled as built-in.
+
+RUSTFLAGS_MODULE
+----------------
+Additional module specific options to use for $(RUSTC).
+
LDFLAGS_MODULE
--------------
Additional options used for $(LD) when linking modules.
@@ -69,6 +82,10 @@ HOSTCXXFLAGS
------------
Additional flags to be passed to $(HOSTCXX) when building host programs.

+HOSTRUSTFLAGS
+-------------
+Additional flags to be passed to $(HOSTRUSTC) when building host programs.
+
HOSTLDFLAGS
-----------
Additional flags to be passed when linking host programs.
diff --git a/Documentation/kbuild/makefiles.rst b/Documentation/kbuild/makefiles.rst
index 11a296e52d68..5ea1e72d89c8 100644
--- a/Documentation/kbuild/makefiles.rst
+++ b/Documentation/kbuild/makefiles.rst
@@ -29,8 +29,9 @@ This document describes the Linux kernel Makefiles.
--- 4.1 Simple Host Program
--- 4.2 Composite Host Programs
--- 4.3 Using C++ for host programs
- --- 4.4 Controlling compiler options for host programs
- --- 4.5 When host programs are actually built
+ --- 4.4 Using Rust for host programs
+ --- 4.5 Controlling compiler options for host programs
+ --- 4.6 When host programs are actually built

=== 5 Userspace Program support
--- 5.1 Simple Userspace Program
@@ -835,7 +836,24 @@ Both possibilities are described in the following.
qconf-cxxobjs := qconf.o
qconf-objs := check.o

-4.4 Controlling compiler options for host programs
+4.4 Using Rust for host programs
+--------------------------------
+
+ Kbuild offers support for host programs written in Rust. However,
+ since a Rust toolchain is not mandatory for kernel compilation,
+ it may only be used in scenarios where Rust is required to be
+ available (e.g. when ``CONFIG_RUST`` is enabled).
+
+ Example::
+
+ hostprogs := target
+ target-rust := y
+
+ Kbuild will compile ``target`` using ``target.rs`` as the crate root,
+ located in the same directory as the ``Makefile``. The crate may
+ consist of several source files (see ``samples/rust/hostprogs``).
+
+4.5 Controlling compiler options for host programs
--------------------------------------------------

When compiling host programs, it is possible to set specific flags.
@@ -867,7 +885,7 @@ Both possibilities are described in the following.
When linking qconf, it will be passed the extra option
"-L$(QTDIR)/lib".

-4.5 When host programs are actually built
+4.6 When host programs are actually built
-----------------------------------------

Kbuild will only build host-programs when they are referenced
@@ -1181,6 +1199,17 @@ When kbuild executes, the following steps are followed (roughly):
The first example utilises the trick that a config option expands
to 'y' when selected.

+ KBUILD_RUSTFLAGS
+ $(RUSTC) compiler flags
+
+ Default value - see top level Makefile
+ Append or modify as required per architecture.
+
+ Often, the KBUILD_RUSTFLAGS variable depends on the configuration.
+
+ Note that target specification file generation (for ``--target``)
+ is handled in ``scripts/generate_rust_target.rs``.
+
KBUILD_AFLAGS_KERNEL
Assembler options specific for built-in

@@ -1208,6 +1237,19 @@ When kbuild executes, the following steps are followed (roughly):
are used for $(CC).
From commandline CFLAGS_MODULE shall be used (see kbuild.rst).

+ KBUILD_RUSTFLAGS_KERNEL
+ $(RUSTC) options specific for built-in
+
+ $(KBUILD_RUSTFLAGS_KERNEL) contains extra Rust compiler flags used to
+ compile resident kernel code.
+
+ KBUILD_RUSTFLAGS_MODULE
+ Options for $(RUSTC) when building modules
+
+ $(KBUILD_RUSTFLAGS_MODULE) is used to add arch-specific options that
+ are used for $(RUSTC).
+ From commandline RUSTFLAGS_MODULE shall be used (see kbuild.rst).
+
KBUILD_LDFLAGS_MODULE
Options for $(LD) when linking modules

diff --git a/Documentation/process/changes.rst b/Documentation/process/changes.rst
index a337e8eabfe1..a886ac497266 100644
--- a/Documentation/process/changes.rst
+++ b/Documentation/process/changes.rst
@@ -31,6 +31,8 @@ you probably needn't concern yourself with pcmciautils.
====================== =============== ========================================
GNU C 5.1 gcc --version
Clang/LLVM (optional) 11.0.0 clang --version
+Rust (optional) 1.60.0 rustc --version
+bindgen (optional) 0.56.0 bindgen --version
GNU make 3.81 make --version
binutils 2.23 ld -v
flex 2.5.35 flex --version
@@ -78,6 +80,29 @@ kernels. Older releases aren't guaranteed to work, and we may drop workarounds
from the kernel that were used to support older versions. Please see additional
docs on :ref:`Building Linux with Clang/LLVM <kbuild_llvm>`.

+Rust (optional)
+---------------
+
+A particular version of the Rust toolchain is required. Newer versions may or
+may not work because the kernel depends on some unstable Rust features, for
+the moment.
+
+Each Rust toolchain comes with several "components", some of which are required
+(like ``rustc``) and some that are optional. The ``rust-src`` component (which
+is optional) needs to be installed to build the kernel. Other components are
+useful for developing.
+
+Please see Documentation/rust/quick-start.rst for instructions on how to
+satisfy the build requirements of Rust support. In particular, the ``Makefile``
+target ``rustavailable`` is useful to check why the Rust toolchain may not
+be detected.
+
+bindgen (optional)
+------------------
+
+``bindgen`` is used to generate the Rust bindings to the C side of the kernel.
+It depends on ``libclang``.
+
Make
----

@@ -340,6 +365,12 @@ Sphinx
Please see :ref:`sphinx_install` in :ref:`Documentation/doc-guide/sphinx.rst <sphinxdoc>`
for details about Sphinx requirements.

+rustdoc
+-------
+
+``rustdoc`` is used to generate the documentation for Rust code. Please see
+Documentation/rust/general-information.rst for more information.
+
Getting updated software
========================

@@ -356,6 +387,16 @@ Clang/LLVM

- :ref:`Getting LLVM <getting_llvm>`.

+Rust
+----
+
+- Documentation/rust/quick-start.rst.
+
+bindgen
+-------
+
+- Documentation/rust/quick-start.rst.
+
Make
----

diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
new file mode 100644
index 000000000000..482757a1f3d0
--- /dev/null
+++ b/Documentation/rust/arch-support.rst
@@ -0,0 +1,34 @@
+Arch Support
+============
+
+Currently, the Rust compiler (``rustc``) uses LLVM for code generation,
+which limits the supported architectures that can be targeted. In addition,
+support for building the kernel with LLVM/Clang varies (please see
+Documentation/kbuild/llvm.rst). This support is needed for ``bindgen``
+which uses ``libclang``.
+
+Below is a general summary of architectures that currently work. Level of
+support corresponds to ``S`` values in the ``MAINTAINERS`` file.
+
+.. list-table::
+ :widths: 10 10 10
+ :header-rows: 1
+
+ * - Architecture
+ - Level of support
+ - Constraints
+ * - ``arm``
+ - Maintained
+ - ``armv6`` and compatible only, ``RUST_OPT_LEVEL >= 2``
+ * - ``arm64``
+ - Maintained
+ - None
+ * - ``powerpc``
+ - Maintained
+ - ``ppc64le`` only, ``RUST_OPT_LEVEL < 2`` requires ``CONFIG_THREAD_SHIFT=15``
+ * - ``riscv``
+ - Maintained
+ - ``riscv64`` only
+ * - ``x86``
+ - Maintained
+ - ``x86_64`` only
diff --git a/Documentation/rust/coding-guidelines.rst b/Documentation/rust/coding-guidelines.rst
new file mode 100644
index 000000000000..2a71fd68a06d
--- /dev/null
+++ b/Documentation/rust/coding-guidelines.rst
@@ -0,0 +1,214 @@
+Coding Guidelines
+=================
+
+This document describes how to write Rust code in the kernel.
+
+
+Style & formatting
+------------------
+
+The code should be formatted using ``rustfmt``. In this way, a person
+contributing from time to time to the kernel does not need to learn and
+remember one more style guide. More importantly, reviewers and maintainers
+do not need to spend time pointing out style issues anymore, and thus
+less patch roundtrips may be needed to land a change.
+
+.. note:: Conventions on comments and documentation are not checked by
+ ``rustfmt``. Thus those are still needed to be taken care of.
+
+The default settings of ``rustfmt`` are used. This means the idiomatic Rust
+style is followed. For instance, 4 spaces are used for indentation rather
+than tabs.
+
+It is convenient to instruct editors/IDEs to format while typing,
+when saving or at commit time. However, if for some reason reformatting
+the entire kernel Rust sources is needed at some point, the following can be
+run::
+
+ make LLVM=1 rustfmt
+
+It is also possible to check if everything is formatted (printing a diff
+otherwise), for instance for a CI, with::
+
+ make LLVM=1 rustfmtcheck
+
+Like ``clang-format`` for the rest of the kernel, ``rustfmt`` works on
+individual files, and does not require a kernel configuration. Sometimes it may
+even work with broken code.
+
+
+Comments
+--------
+
+"Normal" comments (i.e. ``//``, rather than code documentation which starts
+with ``///`` or ``//!``) are written in Markdown the same way as documentation
+comments are, even though they will not be rendered. This improves consistency,
+simplifies the rules and allows to move content between the two kinds of
+comments more easily. For instance:
+
+.. code-block:: rust
+
+ // `object` is ready to be handled now.
+ f(object);
+
+Furthermore, just like documentation, comments are capitalized at the beginning
+of a sentence and ended with a period (even if it is a single sentence). This
+includes ``// SAFETY:``, ``// TODO:`` and other "tagged" comments, e.g.:
+
+.. code-block:: rust
+
+ // FIXME: The error should be handled properly.
+
+Comments should not be used for documentation purposes: comments are intended
+for implementation details, not users. This distinction is useful even if the
+reader of the source file is both an implementor and a user of an API. In fact,
+sometimes it is useful to use both comments and documentation at the same time.
+For instance, for a ``TODO`` list or to comment on the documentation itself.
+For the latter case, comments can be inserted in the middle; that is, closer to
+the line of documentation to be commented. For any other case, comments are
+written after the documentation, e.g.:
+
+.. code-block:: rust
+
+ /// Returns a new [`Foo`].
+ ///
+ /// # Examples
+ ///
+ // TODO: Find a better example.
+ /// ```
+ /// let foo = f(42);
+ /// ```
+ // FIXME: Use fallible approach.
+ pub fn f(x: i32) -> Foo {
+ // ...
+ }
+
+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.:
+
+.. code-block:: rust
+
+ // SAFETY: `p` is valid by the safety requirements.
+ unsafe { *p = 0; }
+
+``// SAFETY:`` comments are not to be confused with the ``# Safety`` sections
+in code documentation. ``# Safety`` sections specify the contract that callers
+(for functions) or implementors (for traits) need to abide by. ``// SAFETY:``
+comments show why a call (for functions) or implementation (for traits) actually
+respects the preconditions stated in a ``# Safety`` section or the language
+reference.
+
+
+Code documentation
+------------------
+
+Rust kernel code is not documented like C kernel code (i.e. via kernel-doc).
+Instead, the usual system for documenting Rust code is used: the ``rustdoc``
+tool, which uses Markdown (a lightweight markup language).
+
+To learn Markdown, there are many guides available out there. For instance,
+the one at:
+
+ https://commonmark.org/help/
+
+This is how a well-documented Rust function may look like:
+
+.. code-block:: rust
+
+ /// Returns the contained [`Some`] value, consuming the `self` value,
+ /// without checking that the value is not [`None`].
+ ///
+ /// # Safety
+ ///
+ /// Calling this method on [`None`] is *[undefined behavior]*.
+ ///
+ /// [undefined behavior]: https://doc.rust-lang.org/reference/behavior-considered-undefined.html
+ ///
+ /// # Examples
+ ///
+ /// ```
+ /// let x = Some("air");
+ /// assert_eq!(unsafe { x.unwrap_unchecked() }, "air");
+ /// ```
+ pub unsafe fn unwrap_unchecked(self) -> T {
+ match self {
+ Some(val) => val,
+
+ // SAFETY: The safety contract must be upheld by the caller.
+ None => unsafe { hint::unreachable_unchecked() },
+ }
+ }
+
+This example showcases a few ``rustdoc`` features and some conventions followed
+in the kernel:
+
+ - The first paragraph must be a single sentence briefly describing what
+ the documented item does. Further explanations must go in extra paragraphs.
+
+ - Unsafe functions must document their safety preconditions under
+ a ``# Safety`` section.
+
+ - While not shown here, if a function may panic, the conditions under which
+ that happens must be described under a ``# Panics`` section.
+
+ Please note that panicking should be very rare and used only with a good
+ reason. In almost all cases, a fallible approach should be used, typically
+ returning a ``Result``.
+
+ - If providing examples of usage would help readers, they must be written in
+ a section called ``# Examples``.
+
+ - Rust items (functions, types, constants...) must be linked appropriately
+ (``rustdoc`` will create a link automatically).
+
+ - Any ``unsafe`` block must be preceded by a ``// SAFETY:`` comment
+ describing why the code inside is sound.
+
+ While sometimes the reason might look trivial and therefore unneeded,
+ writing these comments is not just a good way of documenting what has been
+ taken into account, but most importantly, it provides a way to know that
+ there are no *extra* implicit constraints.
+
+To learn more about how to write documentation for Rust and extra features,
+please take a look at the ``rustdoc`` book at:
+
+ https://doc.rust-lang.org/rustdoc/how-to-write-documentation.html
+
+
+Naming
+------
+
+Rust kernel code follows the usual Rust naming conventions:
+
+ https://rust-lang.github.io/api-guidelines/naming.html
+
+When existing C concepts (e.g. macros, functions, objects...) are wrapped into
+a Rust abstraction, a name as close as reasonably possible to the C side should
+be used in order to avoid confusion and to improve readability when switching
+back and forth between the C and Rust sides. For instance, macros such as
+``pr_info`` from C are named the same in the Rust side.
+
+Having said that, casing should be adjusted to follow the Rust naming
+conventions, and namespacing introduced by modules and types should not be
+repeated in the item names. For instance, when wrapping constants like:
+
+.. code-block:: c
+
+ #define GPIO_LINE_DIRECTION_IN 0
+ #define GPIO_LINE_DIRECTION_OUT 1
+
+The equivalent in Rust may look like (ignoring documentation):
+
+.. code-block:: rust
+
+ pub mod gpio {
+ pub enum LineDirection {
+ In = bindings::GPIO_LINE_DIRECTION_IN as _,
+ Out = bindings::GPIO_LINE_DIRECTION_OUT as _,
+ }
+ }
+
+That is, the equivalent of ``GPIO_LINE_DIRECTION_IN`` would be referred to as
+``gpio::LineDirection::In``. In particular, it should not be named
+``gpio::gpio_line_direction::GPIO_LINE_DIRECTION_IN``.
diff --git a/Documentation/rust/general-information.rst b/Documentation/rust/general-information.rst
new file mode 100644
index 000000000000..e2713f145a17
--- /dev/null
+++ b/Documentation/rust/general-information.rst
@@ -0,0 +1,77 @@
+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 rust/doc/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
diff --git a/Documentation/rust/index.rst b/Documentation/rust/index.rst
new file mode 100644
index 000000000000..d28e816513aa
--- /dev/null
+++ b/Documentation/rust/index.rst
@@ -0,0 +1,20 @@
+Rust
+====
+
+Documentation related to Rust within the kernel. To start using Rust
+in the kernel, please read the quick-start.rst guide.
+
+.. toctree::
+ :maxdepth: 1
+
+ quick-start
+ general-information
+ coding-guidelines
+ arch-support
+
+.. only:: subproject and html
+
+ Indices
+ =======
+
+ * :ref:`genindex`
diff --git a/Documentation/rust/logo.svg b/Documentation/rust/logo.svg
new file mode 100644
index 000000000000..65be792a5abe
--- /dev/null
+++ b/Documentation/rust/logo.svg
@@ -0,0 +1,357 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg width="104.5" height="104.5" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
+ <defs>
+ <linearGradient id="a">
+ <stop stop-color="#fefefc" offset="0"/>
+ <stop stop-color="#fefefc" offset=".75734"/>
+ <stop stop-color="#d4d4d4" offset="1"/>
+ </linearGradient>
+ <linearGradient id="j">
+ <stop stop-color="#b98309" offset="0"/>
+ <stop stop-color="#382605" offset="1"/>
+ </linearGradient>
+ <filter id="bw" x="-.10751" y="-.1085" width="1.215" height="1.217" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="3.9237191"/>
+ </filter>
+ <filter id="bx" x="-.075366" y="-.069725" width="1.1507" height="1.1394" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="2.4365744"/>
+ </filter>
+ <filter id="bv" x="-.033766" y="-.018616" width="1.0675" height="1.0372" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="0.3702557"/>
+ </filter>
+ <filter id="bl" x="-.10104" y="-.04267" width="1.2021" height="1.0853" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="1.1322032"/>
+ </filter>
+ <linearGradient id="h">
+ <stop stop-color="#7c7c7c" offset="0"/>
+ <stop stop-color="#7c7c7c" stop-opacity=".32941" offset="1"/>
+ </linearGradient>
+ <filter id="bp" x="-.070456" y="-.1506" width="1.1409" height="1.3012" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="1.0252435"/>
+ </filter>
+ <filter id="bq" x="-.070456" y="-.1506" width="1.1409" height="1.3012" color-interpolation-filters="sRGB">
+ <feGaussianBlur stdDeviation="1.0252435"/>
+ </filter>
+ <linearGradient id="i">
+ <stop stop-color="#110800" offset="0"/>
+ <stop stop-color="#a65a00" stop-opacity=".8" offset=".59067"/>
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diff --git a/Documentation/rust/quick-start.rst b/Documentation/rust/quick-start.rst
new file mode 100644
index 000000000000..d23ee31d4716
--- /dev/null
+++ b/Documentation/rust/quick-start.rst
@@ -0,0 +1,230 @@
+Quick Start
+===========
+
+This document describes how to get started with kernel development in Rust.
+
+
+Requirements: Building
+----------------------
+
+This section explains how to fetch the tools needed for building.
+
+Some of these requirements might be available from Linux distributions
+under names like ``rustc``, ``rust-src``, ``rust-bindgen``, etc. However,
+at the time of writing, they are likely not to be recent enough unless
+the distribution tracks the latest releases.
+
+To easily check whether the requirements are met, the following target
+can be used::
+
+ make LLVM=1 rustavailable
+
+This triggers the same logic used by Kconfig to determine whether
+``RUST_IS_AVAILABLE`` should be enabled; but it also explains why not
+if that is the case.
+
+
+rustc
+*****
+
+A particular version of the Rust compiler is required. Newer versions may or
+may not work because, for the moment, the kernel depends on some unstable
+Rust features.
+
+If ``rustup`` is being used, enter the checked out source code directory
+and run::
+
+ rustup override set $(scripts/min-tool-version.sh rustc)
+
+Otherwise, fetch a standalone installer or install ``rustup`` from:
+
+ https://www.rust-lang.org
+
+
+Rust standard library source
+****************************
+
+The Rust standard library source is required because the build system will
+cross-compile ``core`` and ``alloc``.
+
+If ``rustup`` is being used, run::
+
+ rustup component add rust-src
+
+The components are installed per toolchain, thus upgrading the Rust compiler
+version later on requires re-adding the component.
+
+Otherwise, if a standalone installer is used, the Rust repository may be cloned
+into the installation folder of the toolchain::
+
+ git clone --recurse-submodules \
+ --branch $(scripts/min-tool-version.sh rustc) \
+ https://github.com/rust-lang/rust \
+ $(rustc --print sysroot)/lib/rustlib/src/rust
+
+In this case, upgrading the Rust compiler version later on requires manually
+updating this clone.
+
+
+libclang
+********
+
+``libclang`` (part of LLVM) is used by ``bindgen`` to understand the C code
+in the kernel, which means LLVM needs to be installed; like when the kernel
+is compiled with ``CC=clang`` or ``LLVM=1``.
+
+Linux distributions are likely to have a suitable one available, so it is
+best to check that first.
+
+There are also some binaries for several systems and architectures uploaded at:
+
+ https://releases.llvm.org/download.html
+
+Otherwise, building LLVM takes quite a while, but it is not a complex process:
+
+ https://llvm.org/docs/GettingStarted.html#getting-the-source-code-and-building-llvm
+
+Please see Documentation/kbuild/llvm.rst for more information and further ways
+to fetch pre-built releases and distribution packages.
+
+
+bindgen
+*******
+
+The bindings to the C side of the kernel are generated at build time using
+the ``bindgen`` tool. A particular version is required.
+
+Install it via (note that this will download and build the tool from source)::
+
+ cargo install --locked --version $(scripts/min-tool-version.sh bindgen) bindgen
+
+
+Requirements: Developing
+------------------------
+
+This section explains how to fetch the tools needed for developing. That is,
+they are not needed when just building the kernel.
+
+
+rustfmt
+*******
+
+The ``rustfmt`` tool is used to automatically format all the Rust kernel code,
+including the generated C bindings (for details, please see
+coding-guidelines.rst).
+
+If ``rustup`` is being used, its ``default`` profile already installs the tool,
+thus nothing needs to be done. If another profile is being used, the component
+can be installed manually::
+
+ rustup component add rustfmt
+
+The standalone installers also come with ``rustfmt``.
+
+
+clippy
+******
+
+``clippy`` is a Rust linter. Running it provides extra warnings for Rust code.
+It can be run by passing ``CLIPPY=1`` to ``make`` (for details, please see
+general-information.rst).
+
+If ``rustup`` is being used, its ``default`` profile already installs the tool,
+thus nothing needs to be done. If another profile is being used, the component
+can be installed manually::
+
+ rustup component add clippy
+
+The standalone installers also come with ``clippy``.
+
+
+cargo
+*****
+
+``cargo`` is the Rust native build system. It is currently required to run
+the tests since it is used to build a custom standard library that contains
+the facilities provided by the custom ``alloc`` in the kernel. The tests can
+be run using the ``rusttest`` Make target.
+
+If ``rustup`` is being used, all the profiles already install the tool,
+thus nothing needs to be done.
+
+The standalone installers also come with ``cargo``.
+
+
+rustdoc
+*******
+
+``rustdoc`` is the documentation tool for Rust. It generates pretty HTML
+documentation for Rust code (for details, please see
+general-information.rst).
+
+``rustdoc`` is also used to test the examples provided in documented Rust code
+(called doctests or documentation tests). The ``rusttest`` Make target uses
+this feature.
+
+If ``rustup`` is being used, all the profiles already install the tool,
+thus nothing needs to be done.
+
+The standalone installers also come with ``rustdoc``.
+
+
+rust-analyzer
+*************
+
+The `rust-analyzer <https://rust-analyzer.github.io/>`_ language server can
+be used with many editors to enable syntax highlighting, completion, go to
+definition, and other features.
+
+``rust-analyzer`` needs a configuration file, ``rust-project.json``, which
+can be generated by the ``rust-analyzer`` Make target.
+
+
+Configuration
+-------------
+
+``Rust support`` (``CONFIG_RUST``) needs to be enabled in the ``General setup``
+menu. The option is only shown if a suitable Rust toolchain is found (see
+above), as long as the other requirements are met. In turn, this will make
+visible the rest of options that depend on Rust.
+
+Afterwards, go to::
+
+ Kernel hacking
+ -> Sample kernel code
+ -> Rust samples
+
+And enable some sample modules either as built-in or as loadable.
+
+
+Building
+--------
+
+Building a kernel with a complete LLVM toolchain is the best supported setup
+at the moment. That is::
+
+ make LLVM=1
+
+For architectures that do not support a full LLVM toolchain, use::
+
+ make CC=clang
+
+Using GCC also works for some configurations, but it is very experimental at
+the moment.
+
+
+Hacking
+-------
+
+To dive deeper, take a look at the source code of the samples
+at ``samples/rust/``, the Rust support code under ``rust/`` and
+the ``Rust hacking`` menu under ``Kernel hacking``.
+
+If GDB/Binutils is used and Rust symbols are not getting demangled, the reason
+is the toolchain does not support Rust's new v0 mangling scheme yet.
+There are a few ways out:
+
+ - Install a newer release (GDB >= 10.2, Binutils >= 2.36).
+
+ - Some versions of GDB (e.g. vanilla GDB 10.1) are able to use
+ the pre-demangled names embedded in the debug info (``CONFIG_DEBUG_INFO``).
--
2.35.3

2022-05-09 02:47:19

by Miguel Ojeda

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

On Sat, May 7, 2022 at 10:15 AM Kees Cook <[email protected]> wrote:
>
> I like the docs! :) It'll be interesting to see how we can grow
> cross-linking between rustdoc and kerndoc.

Thanks!

For cross-referencing, my plan is to start on the Rust side by
allowing to link C files and items (either their generated docs or the
source file), since we do that often in the Rust docs. The goal is
that one can just write an "intra-doc link" in Rust docs just like any
other one, e.g.:

/// Wraps the kernel's [`struct sk_buff`].
#[repr(transparent)]
pub struct SkBuff(UnsafeCell<bindings::sk_buff>);

so that it is as easy as possible to add them.

Cheers,
Miguel

2022-05-09 09:10:22

by Kees Cook

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

On Sat, May 07, 2022 at 07:24:16AM +0200, Miguel Ojeda wrote:
> Most of the documentation for Rust is written within the source code
> itself, as it is idiomatic for Rust projects. This applies to both
> the shared infrastructure at `rust/` as well as any other Rust module
> (e.g. drivers) written across the kernel.
>
> However, these documents contain general information that does not
> fit particularly well in the source code, like the Quick Start guide.
>
> It also contains an asset (SVG logo) used for the `rustdoc` target
> and a few other small changes elsewhere in the documentation folder.

I like the docs! :) It'll be interesting to see how we can grow
cross-linking between rustdoc and kerndoc.

Reviewed-by: Kees Cook <[email protected]>

--
Kees Cook

2022-05-09 10:08:24

by Akira Yokosawa

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

Hi Miguel,

On Sat, 7 May 2022 07:24:16 +0200,
Miguel Ojeda wrote:
> Most of the documentation for Rust is written within the source code
> itself, as it is idiomatic for Rust projects. This applies to both
> the shared infrastructure at `rust/` as well as any other Rust module
> (e.g. drivers) written across the kernel.
>
> However, these documents contain general information that does not
> fit particularly well in the source code, like the Quick Start guide.
>
> It also contains an asset (SVG logo) used for the `rustdoc` target
> and a few other small changes elsewhere in the documentation folder.
>
> Co-developed-by: Alex Gaynor <[email protected]>
> Signed-off-by: Alex Gaynor <[email protected]>
> Co-developed-by: Finn Behrens <[email protected]>
> Signed-off-by: Finn Behrens <[email protected]>
> Co-developed-by: Adam Bratschi-Kaye <[email protected]>
> Signed-off-by: Adam Bratschi-Kaye <[email protected]>
> Co-developed-by: Wedson Almeida Filho <[email protected]>
> Signed-off-by: Wedson Almeida Filho <[email protected]>
> Co-developed-by: Michael Ellerman <[email protected]>
> Signed-off-by: Michael Ellerman <[email protected]>
> Co-developed-by: Sven Van Asbroeck <[email protected]>
> Signed-off-by: Sven Van Asbroeck <[email protected]>
> Co-developed-by: Wu XiangCheng <[email protected]>
> Signed-off-by: Wu XiangCheng <[email protected]>
> Co-developed-by: Gary Guo <[email protected]>
> Signed-off-by: Gary Guo <[email protected]>
> Co-developed-by: Boris-Chengbiao Zhou <[email protected]>
> Signed-off-by: Boris-Chengbiao Zhou <[email protected]>
> Co-developed-by: Yuki Okushi <[email protected]>
> Signed-off-by: Yuki Okushi <[email protected]>
> Co-developed-by: Wei Liu <[email protected]>
> Signed-off-by: Wei Liu <[email protected]>
> Co-developed-by: Daniel Xu <[email protected]>
> Signed-off-by: Daniel Xu <[email protected]>
> Co-developed-by: Julian Merkle <[email protected]>
> Signed-off-by: Julian Merkle <[email protected]>
> Signed-off-by: Miguel Ojeda <[email protected]>
> ---
> Documentation/doc-guide/kernel-doc.rst | 3 +
> Documentation/index.rst | 1 +
> Documentation/kbuild/kbuild.rst | 17 +
> Documentation/kbuild/makefiles.rst | 50 ++-
> Documentation/process/changes.rst | 41 +++
> Documentation/rust/arch-support.rst | 34 ++
> Documentation/rust/coding-guidelines.rst | 214 ++++++++++++
> Documentation/rust/general-information.rst | 77 +++++
> Documentation/rust/index.rst | 20 ++
> Documentation/rust/logo.svg | 357 +++++++++++++++++++++
I think you agreed splitting SVG part into its own patch with
a proper copying info, etc. Let me see... So, here is the link:

https://lore.kernel.org/lkml/CANiq72mLtvWJ5peSTpYQ8AeLEskga6Pda8Q7Daysv2pfycnyxA@mail.gmail.com/

I might have missed v5 of this patch series.
That might be because v5's 15/20 was not accepted by linux-doc's
lore archive (maybe) due to its size despite it had Cc: linux-doc.
v6's 18/23 was also rejected.

> Documentation/rust/quick-start.rst | 230 +++++++++++++
> 11 files changed, 1040 insertions(+), 4 deletions(-)
> create mode 100644 Documentation/rust/arch-support.rst
> create mode 100644 Documentation/rust/coding-guidelines.rst
> create mode 100644 Documentation/rust/general-information.rst
> create mode 100644 Documentation/rust/index.rst
> create mode 100644 Documentation/rust/logo.svg
> create mode 100644 Documentation/rust/quick-start.rst

I have some alternative ideas for table formatting in ReST.

> diff --git a/Documentation/rust/arch-support.rst b/Documentation/rust/arch-support.rst
> new file mode 100644
> index 000000000000..482757a1f3d0
> --- /dev/null
> +++ b/Documentation/rust/arch-support.rst
> @@ -0,0 +1,34 @@
> +Arch Support
> +============
> +
> +Currently, the Rust compiler (``rustc``) uses LLVM for code generation,
> +which limits the supported architectures that can be targeted. In addition,
> +support for building the kernel with LLVM/Clang varies (please see
> +Documentation/kbuild/llvm.rst). This support is needed for ``bindgen``
> +which uses ``libclang``.
> +
> +Below is a general summary of architectures that currently work. Level of
> +support corresponds to ``S`` values in the ``MAINTAINERS`` file.
> +
> +.. list-table::
> + :widths: 10 10 10
> + :header-rows: 1
> +
> + * - Architecture
> + - Level of support
> + - Constraints
> + * - ``arm``
> + - Maintained
> + - ``armv6`` and compatible only, ``RUST_OPT_LEVEL >= 2``
> + * - ``arm64``
> + - Maintained
> + - None
> + * - ``powerpc``
> + - Maintained
> + - ``ppc64le`` only, ``RUST_OPT_LEVEL < 2`` requires ``CONFIG_THREAD_SHIFT=15``
> + * - ``riscv``
> + - Maintained
> + - ``riscv64`` only
> + * - ``x86``
> + - Maintained
> + - ``x86_64`` only

Excerpt from Section "list tables" in
Documentation/doc-guide/sphinx.rst:

> The list-table formats can be useful for tables that are not easily laid
> out in the usual Sphinx ASCII-art formats. These formats are nearly
> impossible for readers of the plain-text documents to understand, though,
> and should be avoided in the absence of a strong justification for their
> use.

So here are a couple of alternative ways to represent the table

* ASCII-art format:

============ ================ ==========================================
Architecture Level of support Constraints
============ ================ ==========================================
``arm`` Maintained ``armv6`` and compatible only,
``RUST_OPT_LEVEL >= 2``
``arm64`` Maintained None
``powerpc`` Maintained ``ppc64le`` only, ``RUST_OPT_LEVEL < 2``
requires ``CONFIG_THREAD_SHIFT=15``
``riscv`` Maintained ``riscv64`` only
``x86`` Maintained ``x86_64`` only
============ ================ ==========================================

* Literal block format:

::

Architecture Level of support Constraints
------------ ---------------- -------------------------------------
arm Maintained armv6 and compatible only,
RUST_OPT_LEVEL >= 2
arm64 Maintained None
powerpc Maintained ppc64le only, RUST_OPT_LEVEL < 2
requires CONFIG_THREAD_SHIFT=15
riscv Maintained riscv64 only
x86 Maintained x86_64 only


"::" above the table marks the start of a literal block.
Indents are important for la iteral block to work.
A literal block ends at a line which has the same indent as
the preceding paragraph, in this case with no indent, or at
the end of file.

As you see, those inline-literal markers of ``xxxx``, which are
distracting when the .rst file is read as plain-text, are not
necessary in the literal-block approach. And you can directly
tweak line breaks in the Constraints column in the final HTML
and PDF docs.

In my opinion, the literal-block approach should be the most
reasonable choice here. Of course its your call which one
to choose.

Thanks, Akira

2022-05-09 11:40:53

by Miguel Ojeda

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

Hi Akira,

On Mon, May 9, 2022 at 6:02 AM Akira Yokosawa <[email protected]> wrote:
>
> I think you agreed splitting SVG part into its own patch with
> a proper copying info, etc. Let me see... So, here is the link:

Yes, sorry, will do (in fact, it should have been there in v5 too).

By the way, the Linux SVG logo (used to make the one here) is pending
in the linux-doc ML.

> I might have missed v5 of this patch series.
> That might be because v5's 15/20 was not accepted by linux-doc's
> lore archive (maybe) due to its size despite it had Cc: linux-doc.
> v6's 18/23 was also rejected.

Yes, a few patches get rejected in several lists. We were told this
was fine as long as LKML gets them (the cover letter has the lists in
Cc).

> I have some alternative ideas for table formatting in ReST.

I was following the LLVM one, but it makes sense to use the other ones
where possible. I can send a patch for that one too.

> So here are a couple of alternative ways to represent the table
>
> * ASCII-art format:
> * Literal block format:

Thanks for taking the time to format the examples, it is useful :)

> As you see, those inline-literal markers of ``xxxx``, which are
> distracting when the .rst file is read as plain-text, are not
> necessary in the literal-block approach. And you can directly

I agree, it can be better (it is one reason I find Markdown a bit more
readable since it uses a single backquote for that instead of two).

> In my opinion, the literal-block approach should be the most
> reasonable choice here. Of course its your call which one
> to choose.

Yeah, that sounds reasonable. I will take a look.

Thanks for the review!

Cheers,
Miguel

2022-05-09 15:03:56

by Akira Yokosawa

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

[+To: Jon]

On Mon, 9 May 2022 12:41:28 +0200,
Miguel Ojeda wrote:
> Hi Akira,
>
> On Mon, May 9, 2022 at 6:02 AM Akira Yokosawa <[email protected]> wrote:
>>
>> I think you agreed splitting SVG part into its own patch with
>> a proper copying info, etc. Let me see... So, here is the link:
>
> Yes, sorry, will do (in fact, it should have been there in v5 too).
>
> By the way, the Linux SVG logo (used to make the one here) is pending
> in the linux-doc ML.

So you mean the following post:

https://lore.kernel.org/lkml/[email protected]/

I'm not sure why Jon has not responded.

Jon, was there any issue on this patch?

>
>> I might have missed v5 of this patch series.
>> That might be because v5's 15/20 was not accepted by linux-doc's
>> lore archive (maybe) due to its size despite it had Cc: linux-doc.
>> v6's 18/23 was also rejected.
>
> Yes, a few patches get rejected in several lists. We were told this
> was fine as long as LKML gets them (the cover letter has the lists in
> Cc).
>
>> I have some alternative ideas for table formatting in ReST.
>
> I was following the LLVM one, but it makes sense to use the other ones
> where possible. I can send a patch for that one too.
>
>> So here are a couple of alternative ways to represent the table
>>
>> * ASCII-art format:
>> * Literal block format:
>
> Thanks for taking the time to format the examples, it is useful :)
Glad you like it. ;-)

Thanks, Akira

>
>> As you see, those inline-literal markers of ``xxxx``, which are
>> distracting when the .rst file is read as plain-text, are not
>> necessary in the literal-block approach. And you can directly
>
> I agree, it can be better (it is one reason I find Markdown a bit more
> readable since it uses a single backquote for that instead of two).
>
>> In my opinion, the literal-block approach should be the most
>> reasonable choice here. Of course its your call which one
>> to choose.
>
> Yeah, that sounds reasonable. I will take a look.
>
> Thanks for the review!
>
> Cheers,
> Miguel

2022-05-09 22:57:59

by Jonathan Corbet

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

Miguel Ojeda <[email protected]> writes:

> Most of the documentation for Rust is written within the source code
> itself, as it is idiomatic for Rust projects. This applies to both
> the shared infrastructure at `rust/` as well as any other Rust module
> (e.g. drivers) written across the kernel.
>
> However, these documents contain general information that does not
> fit particularly well in the source code, like the Quick Start guide.
>
> It also contains an asset (SVG logo) used for the `rustdoc` target
> and a few other small changes elsewhere in the documentation folder.

Trying to take a closer look this time...

I foresee merge conflicts, but so it goes. Trying to split this apart
would not make a lot of sense.

[...]

> --- /dev/null
> +++ b/Documentation/rust/arch-support.rst
> @@ -0,0 +1,34 @@
> +Arch Support
> +============
> +
> +Currently, the Rust compiler (``rustc``) uses LLVM for code generation,
> +which limits the supported architectures that can be targeted. In addition,
> +support for building the kernel with LLVM/Clang varies (please see
> +Documentation/kbuild/llvm.rst). This support is needed for ``bindgen``
> +which uses ``libclang``.
> +
> +Below is a general summary of architectures that currently work. Level of
> +support corresponds to ``S`` values in the ``MAINTAINERS`` file.
> +
> +.. list-table::
> + :widths: 10 10 10
> + :header-rows: 1

Please use normal tables rather than list-table; this kind of thing is
really unreadable in the source form.

> + * - Architecture
> + - Level of support
> + - Constraints
> + * - ``arm``
> + - Maintained
> + - ``armv6`` and compatible only, ``RUST_OPT_LEVEL >= 2``
> + * - ``arm64``
> + - Maintained
> + - None
> + * - ``powerpc``
> + - Maintained
> + - ``ppc64le`` only, ``RUST_OPT_LEVEL < 2`` requires ``CONFIG_THREAD_SHIFT=15``
> + * - ``riscv``
> + - Maintained
> + - ``riscv64`` only
> + * - ``x86``
> + - Maintained
> + - ``x86_64`` only
> diff --git a/Documentation/rust/coding-guidelines.rst b/Documentation/rust/coding-guidelines.rst
> new file mode 100644
> index 000000000000..2a71fd68a06d
> --- /dev/null
> +++ b/Documentation/rust/coding-guidelines.rst
> @@ -0,0 +1,214 @@
> +Coding Guidelines
> +=================
> +
> +This document describes how to write Rust code in the kernel.
> +
> +
> +Style & formatting
> +------------------
> +
> +The code should be formatted using ``rustfmt``. In this way, a person
> +contributing from time to time to the kernel does not need to learn and
> +remember one more style guide. More importantly, reviewers and maintainers
> +do not need to spend time pointing out style issues anymore, and thus
> +less patch roundtrips may be needed to land a change.

I foresee disagreements over coding style conventions in the
future... I don't plan to be part of that conversation :)

> +.. note:: Conventions on comments and documentation are not checked by
> + ``rustfmt``. Thus those are still needed to be taken care of.
> +
> +The default settings of ``rustfmt`` are used. This means the idiomatic Rust
> +style is followed. For instance, 4 spaces are used for indentation rather
> +than tabs.
> +
> +It is convenient to instruct editors/IDEs to format while typing,
> +when saving or at commit time. However, if for some reason reformatting
> +the entire kernel Rust sources is needed at some point, the following can be
> +run::
> +
> + make LLVM=1 rustfmt

I will ask whether we want this, though. Why would anybody want to
mass-reformat the entire body of kernel code? This seems like something
that would generate an endless stream of "helpful" patches and a lot of
churn.

Thanks,

jon

2022-05-10 00:38:08

by Jonathan Corbet

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

Akira Yokosawa <[email protected]> writes:

> [+To: Jon]
>
> On Mon, 9 May 2022 12:41:28 +0200,
> Miguel Ojeda wrote:
>> Hi Akira,
>>
>> On Mon, May 9, 2022 at 6:02 AM Akira Yokosawa <[email protected]> wrote:
>>>
>>> I think you agreed splitting SVG part into its own patch with
>>> a proper copying info, etc. Let me see... So, here is the link:
>>
>> Yes, sorry, will do (in fact, it should have been there in v5 too).
>>
>> By the way, the Linux SVG logo (used to make the one here) is pending
>> in the linux-doc ML.
>
> So you mean the following post:
>
> https://lore.kernel.org/lkml/[email protected]/
>
> I'm not sure why Jon has not responded.
>
> Jon, was there any issue on this patch?

Yeah, but the issues are all with me :) Please accept my apologies for
letting it slip through the cracks.

Looking at it now, though, I hesitate to add the logo (and another
COPYING file) in the top-level Documentation directory - I'd really
rather people not have to pick through a bunch of unrelated stuff to
find the actual docs they want. I'd recommend we make a
Documentation/images (or .../assets or whatever) and put things like
logos there.

Disagree? If not, could I get a version of the patch that does that? I
promise not to set on it for three months this time...

Thanks,

jon

2022-05-10 09:48:55

by Gaelan Steele

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

> On May 9, 2022, at 3:32 PM, Jonathan Corbet <[email protected]> wrote:
>
>> +It is convenient to instruct editors/IDEs to format while typing,
>> +when saving or at commit time. However, if for some reason reformatting
>> +the entire kernel Rust sources is needed at some point, the following can be
>> +run::
>> +
>> + make LLVM=1 rustfmt
>
> I will ask whether we want this, though. Why would anybody want to
> mass-reformat the entire body of kernel code? This seems like something
> that would generate an endless stream of "helpful" patches and a lot of
> churn.

That would only happen if the code diverged from rustfmt’s output in the
first place. Generally, in Rust projects, the source tree is always kept
formatted with rustfmt - so running `make LLVM=1 rustfmt` would only
ever touch code that you’d just changed.

Gaelan

2022-05-10 11:39:08

by Josh Triplett

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

On Mon, May 09, 2022 at 08:14:54PM -0700, Gaelan Steele wrote:
>
>
> > On May 9, 2022, at 3:32 PM, Jonathan Corbet <[email protected]> wrote:
> >
> >> +It is convenient to instruct editors/IDEs to format while typing,
> >> +when saving or at commit time. However, if for some reason reformatting
> >> +the entire kernel Rust sources is needed at some point, the following can be
> >> +run::
> >> +
> >> + make LLVM=1 rustfmt
> >
> > I will ask whether we want this, though. Why would anybody want to
> > mass-reformat the entire body of kernel code? This seems like something
> > that would generate an endless stream of "helpful" patches and a lot of
> > churn.
>
> That would only happen if the code diverged from rustfmt’s output in the
> first place. Generally, in Rust projects, the source tree is always kept
> formatted with rustfmt - so running `make LLVM=1 rustfmt` would only
> ever touch code that you’d just changed.

Exactly. This is convenient for the same reason doing a project-wide
`cargo fmt` is useful in Rust projects: you can do all your editing,
then format your code before committing.

2022-05-10 21:15:15

by Miguel Ojeda

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

On Tue, May 10, 2022 at 12:37 AM Jonathan Corbet <[email protected]> wrote:
>
> Yeah, but the issues are all with me :) Please accept my apologies for
> letting it slip through the cracks.

No apologies needed! It is not an important patch -- I just thought it
would be better to have the "base logo" merged before the "derived
one".

> Looking at it now, though, I hesitate to add the logo (and another
> COPYING file) in the top-level Documentation directory - I'd really
> rather people not have to pick through a bunch of unrelated stuff to
> find the actual docs they want. I'd recommend we make a
> Documentation/images (or .../assets or whatever) and put things like
> logos there.

Yeah, makes sense to avoid dumping things in the top-level directory.

> Disagree? If not, could I get a version of the patch that does that? I
> promise not to set on it for three months this time...

+1, I will send it.

Thanks Jon!

Cheers,
Miguel

2022-05-12 18:04:44

by Miguel Ojeda

Subject: Re: [PATCH v6 18/23] docs: add Rust documentation

On Tue, May 10, 2022 at 12:32 AM Jonathan Corbet <[email protected]> wrote:
>
> Trying to take a closer look this time...
>
> I foresee merge conflicts, but so it goes. Trying to split this apart
> would not make a lot of sense.

Is there a big change coming to docs? (there are not conflicts in
linux-next within the docs). Or what do you mean?

> Please use normal tables rather than list-table; this kind of thing is
> really unreadable in the source form.

Will do!

> I foresee disagreements over coding style conventions in the
> future... I don't plan to be part of that conversation :)

Do you mean with the tool settings? I guess we may get some proposals
about tweaking them, yeah, but one reason to stick to the defaults is
to avoid that! :)

If you mean enforcing `rustfmt`, please see below.

> I will ask whether we want this, though. Why would anybody want to
> mass-reformat the entire body of kernel code? This seems like something
> that would generate an endless stream of "helpful" patches and a lot of
> churn.

So the idea is that, since everything is already formatted, the output
of this is empty (in mainline), like Gaelan/Josh mentioned. Thus
nobody should be sending any formatting patches since there is nothing
to change.

Now, for those developing and not running `rustfmt` automatically in
some way (e.g. in their editors), it can be useful to run it before
submitting the patches: the output should only show changes to
whatever you changed since everything else should be already
formatted.

Of course, as soon as others start submitting patches independently,
mistakes may slip through, but we are enforcing this in our CI (and it
could be done more centrally), so we should notice quickly.

There could be, of course, bugs in the tool; and there are a few
situations where the tool may not guarantee formatting stability, but
hopefully those are rare and small enough so that we can keep
enforcing this. I think it is worth trying.

Cheers,
Miguel