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de7cd3e4d6
Macros and auto-generated code should use absolute paths, `::core::...` and `::kernel::...`, for core and kernel references. This prevents issues where user-defined modules named `core` or `kernel` could be picked up instead of the `core` or `kernel` crates. Thus clean some references up. Suggested-by: Benno Lossin <benno.lossin@proton.me> Closes: https://github.com/Rust-for-Linux/linux/issues/1150 Signed-off-by: Igor Korotin <igor.korotin.linux@gmail.com> Reviewed-by: Benno Lossin <lossin@kernel.org> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Link: https://lore.kernel.org/r/20250519164615.3310844-1-igor.korotin.linux@gmail.com [ Applied `rustfmt`. Reworded slightly. - Miguel ] Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
48 lines
1.2 KiB
Rust
48 lines
1.2 KiB
Rust
// SPDX-License-Identifier: GPL-2.0
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//! Foreign function interface (FFI) types.
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//!
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//! This crate provides mapping from C primitive types to Rust ones.
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//!
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//! The Rust [`core`] crate provides [`core::ffi`], which maps integer types to the platform default
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//! C ABI. The kernel does not use [`core::ffi`], so it can customise the mapping that deviates from
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//! the platform default.
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#![no_std]
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macro_rules! alias {
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($($name:ident = $ty:ty;)*) => {$(
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#[allow(non_camel_case_types, missing_docs)]
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pub type $name = $ty;
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// Check size compatibility with `core`.
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const _: () = assert!(
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::core::mem::size_of::<$name>() == ::core::mem::size_of::<::core::ffi::$name>()
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);
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)*}
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}
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alias! {
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// `core::ffi::c_char` is either `i8` or `u8` depending on architecture. In the kernel, we use
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// `-funsigned-char` so it's always mapped to `u8`.
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c_char = u8;
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c_schar = i8;
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c_uchar = u8;
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c_short = i16;
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c_ushort = u16;
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c_int = i32;
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c_uint = u32;
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// In the kernel, `intptr_t` is defined to be `long` in all platforms, so we can map the type to
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// `isize`.
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c_long = isize;
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c_ulong = usize;
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c_longlong = i64;
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c_ulonglong = u64;
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}
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pub use core::ffi::c_void;
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