kernel/git/next/linux-next.git/rust, branch akpm

Kbuild: add Rust support

2022-05-23T00:24:56+00:00

Having all the new files in place, we now enable Rust support in the build system, including `Kconfig` entries related to Rust, the Rust configuration printer, the target specification generation script, the version detection script and a few other bits. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Finn Behrens Signed-off-by: Finn Behrens Co-developed-by: Adam Bratschi-Kaye Signed-off-by: Adam Bratschi-Kaye Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Michael Ellerman Signed-off-by: Michael Ellerman Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Boris-Chengbiao Zhou Signed-off-by: Boris-Chengbiao Zhou Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng Co-developed-by: Douglas Su Signed-off-by: Douglas Su Co-developed-by: Dariusz Sosnowski Signed-off-by: Dariusz Sosnowski Co-developed-by: Antonio Terceiro Signed-off-by: Antonio Terceiro Co-developed-by: Daniel Xu Signed-off-by: Daniel Xu Co-developed-by: Miguel Cano Signed-off-by: Miguel Cano Co-developed-by: David Gow Signed-off-by: David Gow Signed-off-by: Miguel Ojeda

rust: export generated symbols

2022-05-23T00:24:55+00:00

All symbols are reexported reusing the `EXPORT_SYMBOL_GPL` macro from C. The lists of symbols are generated on the fly. There are three main sets of symbols to distinguish: - The ones from the `core` and `alloc` crates (from the Rust standard library). The code is licensed as Apache/MIT. - The ones from our abstractions in the `kernel` crate. - The helpers (already exported since they are not generated). We export everything as GPL. This ensures we do not mistakenly expose GPL kernel symbols/features as non-GPL, even indirectly. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Signed-off-by: Miguel Ojeda

rust: add `kernel` crate

2022-05-23T00:23:15+00:00

The `kernel` crate currently includes all the abstractions that wrap kernel features written in C. These abstractions call the C side of the kernel via the generated bindings with the `bindgen` tool. Modules developed in Rust should never call the bindings themselves. In the future, as the abstractions grow in number, we may need to split this crate into several, possibly following a similar subdivision in subsystems as the kernel itself and/or moving the code to the actual subsystems. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Geoffrey Thomas Signed-off-by: Geoffrey Thomas Co-developed-by: Finn Behrens Signed-off-by: Finn Behrens Co-developed-by: Adam Bratschi-Kaye Signed-off-by: Adam Bratschi-Kaye Co-developed-by: Michael Ellerman Signed-off-by: Michael Ellerman Co-developed-by: Sumera Priyadarsini Signed-off-by: Sumera Priyadarsini Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Boris-Chengbiao Zhou Signed-off-by: Boris-Chengbiao Zhou Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng Co-developed-by: Fox Chen Signed-off-by: Fox Chen Co-developed-by: Dan Robertson Signed-off-by: Dan Robertson Co-developed-by: Viktor Garske Signed-off-by: Viktor Garske Co-developed-by: Dariusz Sosnowski Signed-off-by: Dariusz Sosnowski Co-developed-by: Léo Lanteri Thauvin Signed-off-by: Léo Lanteri Thauvin Co-developed-by: Niklas Mohrin Signed-off-by: Niklas Mohrin Co-developed-by: Gioh Kim Signed-off-by: Gioh Kim Co-developed-by: Daniel Xu Signed-off-by: Daniel Xu Co-developed-by: Milan Landaverde Signed-off-by: Milan Landaverde Co-developed-by: Morgan Bartlett Signed-off-by: Morgan Bartlett Co-developed-by: Maciej Falkowski Signed-off-by: Maciej Falkowski Co-developed-by: Jiapeng Chong Signed-off-by: Jiapeng Chong Co-developed-by: Nándor István Krácser Signed-off-by: Nándor István Krácser Co-developed-by: David Gow Signed-off-by: David Gow Signed-off-by: Wedson Almeida Filho Co-developed-by: Miguel Ojeda Signed-off-by: Miguel Ojeda

rust: add `kernel` crate's `sync` module

2022-05-22T21:02:38+00:00

This module contains the kernel APIs related to synchronisation that have been ported or wrapped for usage by Rust code in the kernel and is shared by all of them. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Geoffrey Thomas Signed-off-by: Geoffrey Thomas Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Daniel Xu Signed-off-by: Daniel Xu Co-developed-by: Hsiang-Cheng Yang Signed-off-by: Hsiang-Cheng Yang Signed-off-by: Wedson Almeida Filho Co-developed-by: Miguel Ojeda Signed-off-by: Miguel Ojeda

rust: add `macros` crate

2022-05-22T21:02:38+00:00

This crate contains all the procedural macros ("proc macros") shared by all the kernel. Procedural macros allow to create syntax extensions. They run at compile-time and can consume as well as produce Rust syntax. For instance, the `module!` macro that is used by Rust modules is implemented here. It allows to easily declare the equivalent information to the `MODULE_*` macros in C modules, e.g.: module! { type: RustMinimal, name: b"rust_minimal", author: b"Rust for Linux Contributors", description: b"Rust minimal sample", license: b"GPL", } Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Finn Behrens Signed-off-by: Finn Behrens Co-developed-by: Adam Bratschi-Kaye Signed-off-by: Adam Bratschi-Kaye Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Sumera Priyadarsini Signed-off-by: Sumera Priyadarsini Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Matthew Bakhtiari Signed-off-by: Matthew Bakhtiari Signed-off-by: Miguel Ojeda

rust: add `build_error` crate

2022-05-22T21:02:38+00:00

The `build_error` crate provides the `build_error` function which is then used to provide the `build_error!` and the `build_assert!` macros. `build_assert!` is intended to be used when `static_assert!` cannot be used, e.g. when the condition refers to generic parameters or parameters of an inline function. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Signed-off-by: Gary Guo Co-developed-by: Miguel Ojeda Signed-off-by: Miguel Ojeda

rust: adapt `alloc` crate to the kernel

2022-05-22T21:02:37+00:00

This customizes the subset of the Rust standard library `alloc` that was just imported as-is, mainly by: - Adding SPDX license identifiers. - Skipping `rc` and `sync` modules via new `cfg`s. - Skipping the `vec!` macro. - Addding fallible (`try_*`) versions of existing infallible methods (i.e. returning a `Result` instead of panicking). Since the standard library requires stable/unstable attributes, these additions are annotated with: #[stable(feature = "kernel", since = "1.0.0")] Using "kernel" as the feature allows to have the additions clearly marked. The "1.0.0" version is just a placeholder. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Matthew Bakhtiari Signed-off-by: Matthew Bakhtiari Signed-off-by: Miguel Ojeda

rust: import upstream `alloc` crate

2022-05-22T21:02:37+00:00

This is a subset of the Rust standard library `alloc` crate, version 1.60.0, licensed under "Apache-2.0 OR MIT", from: https://github.com/rust-lang/rust/tree/1.60.0/library/alloc/src The files are copied as-is, with no modifications whatsoever (not even adding the SPDX identifiers). For copyright details, please see: https://github.com/rust-lang/rust/blob/1.60.0/COPYRIGHT The next patch modifies these files as needed for use within the kernel. This patch split allows reviewers to double-check the import and to clearly see the differences introduced. Vendoring `alloc`, at least for the moment, allows us to have fallible allocations support (i.e. the `try_*` versions of methods which return a `Result` instead of panicking) early on. It also gives a bit more freedom to experiment with new interfaces and to iterate quickly. Eventually, the goal is to have everything the kernel needs in upstream `alloc` and drop it from the kernel tree. For a summary of work on `alloc` happening upstream, please see: https://github.com/Rust-for-Linux/linux/issues/408 Reviewed-by: Kees Cook Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Signed-off-by: Miguel Ojeda

rust: add `compiler_builtins` crate

2022-05-22T21:02:37+00:00

Rust provides `compiler_builtins` as a port of LLVM's `compiler-rt`. Since we do not need the vast majority of them, we avoid the dependency by providing our own crate. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Signed-off-by: Miguel Ojeda

rust: add C helpers

2022-05-22T21:02:37+00:00

This source file contains forwarders to C macros and inlined functions. Co-developed-by: Alex Gaynor Signed-off-by: Alex Gaynor Co-developed-by: Geoffrey Thomas Signed-off-by: Geoffrey Thomas Co-developed-by: Wedson Almeida Filho Signed-off-by: Wedson Almeida Filho Co-developed-by: Sven Van Asbroeck Signed-off-by: Sven Van Asbroeck Co-developed-by: Gary Guo Signed-off-by: Gary Guo Co-developed-by: Boqun Feng Signed-off-by: Boqun Feng Co-developed-by: Maciej Falkowski Signed-off-by: Maciej Falkowski Co-developed-by: Wei Liu Signed-off-by: Wei Liu Signed-off-by: Miguel Ojeda