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https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
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ef9e37973c
Add the `static_assert!` macro, which is a compile-time assert, similar
to the C11 `_Static_assert` and C++11 `static_assert` declarations [1,2].
Do so in a new module, called `static_assert`.
For instance:
static_assert!(42 > 24);
static_assert!(core::mem::size_of::<u8>() == 1);
const X: &[u8] = b"bar";
static_assert!(X[1] == b'a');
const fn f(x: i32) -> i32 {
x + 2
}
static_assert!(f(40) == 42);
Link: https://en.cppreference.com/w/c/language/_Static_assert [1]
Link: https://en.cppreference.com/w/cpp/language/static_assert [2]
Co-developed-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Alex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
83 lines
2.4 KiB
Rust
83 lines
2.4 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! The `kernel` crate.
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//!
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//! This crate contains the kernel APIs that have been ported or wrapped for
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//! usage by Rust code in the kernel and is shared by all of them.
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//!
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//! In other words, all the rest of the Rust code in the kernel (e.g. kernel
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//! modules written in Rust) depends on [`core`], [`alloc`] and this crate.
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//!
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//! If you need a kernel C API that is not ported or wrapped yet here, then
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//! do so first instead of bypassing this crate.
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#![no_std]
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#![feature(allocator_api)]
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#![feature(core_ffi_c)]
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// Ensure conditional compilation based on the kernel configuration works;
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// otherwise we may silently break things like initcall handling.
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#[cfg(not(CONFIG_RUST))]
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compile_error!("Missing kernel configuration for conditional compilation");
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#[cfg(not(test))]
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#[cfg(not(testlib))]
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mod allocator;
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pub mod error;
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pub mod prelude;
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pub mod print;
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mod static_assert;
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#[doc(hidden)]
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pub mod std_vendor;
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pub mod str;
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#[doc(hidden)]
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pub use bindings;
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pub use macros;
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/// Prefix to appear before log messages printed from within the `kernel` crate.
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const __LOG_PREFIX: &[u8] = b"rust_kernel\0";
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/// The top level entrypoint to implementing a kernel module.
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///
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/// For any teardown or cleanup operations, your type may implement [`Drop`].
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pub trait Module: Sized + Sync {
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/// Called at module initialization time.
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///
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/// Use this method to perform whatever setup or registration your module
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/// should do.
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///
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/// Equivalent to the `module_init` macro in the C API.
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fn init(module: &'static ThisModule) -> error::Result<Self>;
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}
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/// Equivalent to `THIS_MODULE` in the C API.
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///
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/// C header: `include/linux/export.h`
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pub struct ThisModule(*mut bindings::module);
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// SAFETY: `THIS_MODULE` may be used from all threads within a module.
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unsafe impl Sync for ThisModule {}
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impl ThisModule {
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/// Creates a [`ThisModule`] given the `THIS_MODULE` pointer.
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///
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/// # Safety
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///
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/// The pointer must be equal to the right `THIS_MODULE`.
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pub const unsafe fn from_ptr(ptr: *mut bindings::module) -> ThisModule {
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ThisModule(ptr)
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}
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}
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#[cfg(not(any(testlib, test)))]
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#[panic_handler]
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fn panic(info: &core::panic::PanicInfo<'_>) -> ! {
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pr_emerg!("{}\n", info);
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// SAFETY: FFI call.
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unsafe { bindings::BUG() };
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// Bindgen currently does not recognize `__noreturn` so `BUG` returns `()`
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// instead of `!`. See <https://github.com/rust-lang/rust-bindgen/issues/2094>.
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loop {}
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}
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