[PATCH v6 01/16] rust: module: add trait `ModuleMetadata`

[Danilo Krummrich <dakr@kernel.org>]

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>
---
 rust/kernel/lib.rs    | 6 ++++++
 rust/macros/module.rs | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index e1065a7551a3..61b82b78b915 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -116,6 +116,12 @@ fn init(module: &'static ThisModule) -> impl init::PinInit<Self, error::Error> {
     }
 }
 
+/// 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)
diff --git a/rust/macros/module.rs b/rust/macros/module.rs
index 2587f41b0d39..cdf94f4982df 100644
--- a/rust/macros/module.rs
+++ b/rust/macros/module.rs
@@ -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 {{
-- 
2.47.1