[PATCH v5 05/15] rust: types: add `Opaque::raw_get`

Benno Lossin
2023-04-03T15:46:06Z

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 <y86-dev@protonmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
---
rust/kernel/types.rs | 8 ++++++++
1 file changed, 8 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index 9d0fdbc55843..ff2b2fac951d 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -238,6 +238,14 @@ impl<T> Opaque<T> {
pub fn get(&self) -> *mut T {
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`.
--
2.39.2