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rust: add Module::as_ptr

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This allows you to get a raw pointer to THIS_MODULE for use in unsafe
code. The Rust Binder RFC uses it when defining fops for the binderfs
component [1].

This doesn't really need to go in now - it could go in together with
Rust Binder like how it is sent in the Rust Binder RFC. However, the
upcoming 1.77.0 release of the Rust compiler introduces a new warning,
and applying this patch now will silence that warning. That allows us to
avoid adding the #[allow(dead_code)] annotation seen in [2].

Link: https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-2-08ba9197f637@google.com/ [1]
Link: https://lore.kernel.org/all/20240217002717.57507-1-ojeda@kernel.org/ [2]
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20240226-module-as-ptr-v1-1-83bc89213113@google.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Alice Ryhl 2024-02-26 09:44:02 +00:00 committed by Miguel Ojeda
parent 4cece76496
commit d0f0241d8d
1 changed files with 7 additions and 0 deletions
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7
rust/kernel/lib.rs
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@ -92,6 +92,13 @@ impl ThisModule {
pub const unsafe fn from_ptr(ptr: *mut bindings::module) -> ThisModule { pub const unsafe fn from_ptr(ptr: *mut bindings::module) -> ThisModule {
ThisModule(ptr) ThisModule(ptr)
} }
/// Access the raw pointer for this module.
///
/// It is up to the user to use it correctly.
pub const fn as_ptr(&self) -> *mut bindings::module {
self.0
}
} }
#[cfg(not(any(testlib, test)))] #[cfg(not(any(testlib, test)))]