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rust: types: add Opaque::raw_get

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This function mirrors `UnsafeCell::raw_get`. It avoids creating a
reference and allows solely using raw pointers.
The `pin-init` API will be using this, since uninitialized memory
requires raw pointers.

Signed-off-by: Benno Lossin <benno.lossin@proton.me>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Link: https://lore.kernel.org/r/20230408122429.1103522-6-y86-dev@protonmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Benno Lossin 2023-04-08 12:25:39 +00:00 • committed by Miguel Ojeda
parent d6dbca3592
commit 3ff6e785ad
1 changed files with 8 additions and 0 deletions
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8
rust/kernel/types.rs
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@ -238,6 +238,14 @@ impl<T> Opaque<T> {
pub fn get(&self) -> *mut T { pub fn get(&self) -> *mut T {
UnsafeCell::raw_get(self.0.as_ptr()) UnsafeCell::raw_get(self.0.as_ptr())
} }
/// Gets the value behind `this`.
///
/// This function is useful to get access to the value without creating intermediate
/// references.
pub const fn raw_get(this: *const Self) -> *mut T {
UnsafeCell::raw_get(this.cast::<UnsafeCell<T>>())
}
} }
/// A sum type that always holds either a value of type `L` or `R`. /// A sum type that always holds either a value of type `L` or `R`.