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rust: module: add trait ModuleMetadata

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In order to access static metadata of a Rust kernel module, add the
`ModuleMetadata` trait.

In particular, this trait provides the name of a Rust kernel module as
specified by the `module!` macro.

Signed-off-by: Danilo Krummrich <dakr@kernel.org>
Tested-by: Dirk Behme <dirk.behme@de.bosch.com>
Tested-by: Fabien Parent <fabien.parent@linaro.org>
Link: https://lore.kernel.org/r/20241219170425.12036-2-dakr@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Danilo Krummrich 2024-12-19 18:04:03 +01:00 • committed by Greg Kroah-Hartman
parent 5bcc8bfe84
commit a790265c7f
2 changed files with 10 additions and 0 deletions
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6
rust/kernel/lib.rs
View file

@ -116,6 +116,12 @@ impl<T: Module> InPlaceModule for T {
}
}
/// Metadata attached to a [`Module`] or [`InPlaceModule`].
pub trait ModuleMetadata {
/// The name of the module as specified in the `module!` macro.
const NAME: &'static crate::str::CStr;
}
/// Equivalent to `THIS_MODULE` in the C API.
///
/// C header: [`include/linux/init.h`](srctree/include/linux/init.h)

4
rust/macros/module.rs
View file

@ -228,6 +228,10 @@ pub(crate) fn module(ts: TokenStream) -> TokenStream {
kernel::ThisModule::from_ptr(core::ptr::null_mut())
}};
impl kernel::ModuleMetadata for {type_} {{
const NAME: &'static kernel::str::CStr = kernel::c_str!(\"{name}\");
}}
// Double nested modules, since then nobody can access the public items inside.
mod __module_init {{
mod __module_init {{