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[v4,05/15] rust: types: add `Opaque::raw_get`

Message ID 20230331215053.585759-6-y86-dev@protonmail.com
State New
Headers
Series Rust pin-init API for pinned initialization of structs |

Commit Message

y86-dev March 31, 2023, 9:52 p.m. UTC 
  From: Benno Lossin <y86-dev@protonmail.com>

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(+)

--
2.39.2
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Patch

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`.