Add a `MODULE_PTR` const to the `ModuleMetadata` trait so that modules can provide a constant pointer to their `struct module` usable in const contexts such as static file_operations.
Signed-off-by: Alvin Sun <[email protected]> --- rust/kernel/lib.rs | 3 +++ rust/macros/module.rs | 14 ++++++++++++++ 2 files changed, 17 insertions(+) diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs index b72b2fbe046d6..c7e809636e1a9 100644 --- a/rust/kernel/lib.rs +++ b/rust/kernel/lib.rs @@ -184,6 +184,9 @@ fn init(module: &'static ThisModule) -> impl pin_init::PinInit<Self, error::Erro pub trait ModuleMetadata { /// The name of the module as specified in the `module!` macro. const NAME: &'static crate::str::CStr; + + /// The pointer to the kernel `struct module` for this module. + const MODULE_PTR: *mut bindings::module; } /// Equivalent to `THIS_MODULE` in the C API. diff --git a/rust/macros/module.rs b/rust/macros/module.rs index 06c18e2075083..7204fe604f24a 100644 --- a/rust/macros/module.rs +++ b/rust/macros/module.rs @@ -519,6 +519,20 @@ pub(crate) fn module(info: ModuleInfo) -> Result<TokenStream> { impl ::kernel::ModuleMetadata for #type_ { const NAME: &'static ::kernel::str::CStr = #name_cstr; + + #[cfg(MODULE)] + const MODULE_PTR: *mut ::kernel::bindings::module = { + extern "C" { + static __this_module: ::kernel::types::Opaque<::kernel::bindings::module>; + } + + // SAFETY: `__this_module` is constructed by the kernel at load time + // and lives until the module is unloaded. + unsafe { __this_module.get() } + }; + + #[cfg(not(MODULE))] + const MODULE_PTR: *mut ::kernel::bindings::module = ::core::ptr::null_mut(); } // Double nested modules, since then nobody can access the public items inside. -- 2.43.0
