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rust: types: Make Opaque::get const

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commit be2ca1e03965ffb214b6cbda0ffd84daeeb5f214 upstream.

To support a potential usage:

    static foo: Opaque<Foo> = ..; // Or defined in an extern block.

    ...

    fn bar() {
        let ptr = foo.get();
    }

`Opaque::get` need to be `const`, otherwise compiler will complain
because calls on statics are limited to const functions.

Also `Opaque::get` should be naturally `const` since it's a composition
of two `const` functions: `UnsafeCell::get` and `ptr::cast`.

Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Wedson Almeida Filho <walmeida@microsoft.com>
Reviewed-by: Benno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20240401214543.1242286-1-boqun.feng@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Boqun Feng 2024-04-01 14:45:36 -07:00 • committed by Greg Kroah-Hartman
parent 77ee2eaee4
commit d6344cc86f
1 changed files with 1 additions and 1 deletions
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2
rust/kernel/types.rs
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@ -248,7 +248,7 @@ impl<T> Opaque<T> {
} }
/// Returns a raw pointer to the opaque data. /// Returns a raw pointer to the opaque data.
pub fn get(&self) -> *mut T { pub const fn get(&self) -> *mut T {
UnsafeCell::get(&self.value).cast::<T>() UnsafeCell::get(&self.value).cast::<T>()
} }