linux-kernel - [PATCH v5 05/16] rust: types: add `Opaque::pin

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Message-ID: <20241210224947.23804-6-dakr@kernel.org>
Date: Tue, 10 Dec 2024 23:46:32 +0100
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
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Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
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	devicetree@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH v5 05/16] rust: types: add `Opaque::pin_init`

Analogous to `Opaque::new` add `Opaque::pin_init`, which instead of a
value `T` takes a `PinInit<T>` and returns a `PinInit<Opaque<T>>`.

Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 rust/kernel/types.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index ec6457bb3084..3aea6af9a0bc 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -281,6 +281,17 @@ pub const fn uninit() -> Self {
         }
     }
 
+    /// Create an opaque pin-initializer from the given pin-initializer.
+    pub fn pin_init(slot: impl PinInit<T>) -> impl PinInit<Self> {
+        Self::ffi_init(|ptr: *mut T| {
+            // SAFETY:
+            //   - `ptr` is a valid pointer to uninitialized memory,
+            //   - `slot` is not accessed on error; the call is infallible,
+            //   - `slot` is pinned in memory.
+            let _ = unsafe { init::PinInit::<T>::__pinned_init(slot, ptr) };
+        })
+    }
+
     /// Creates a pin-initializer from the given initializer closure.
     ///
     /// The returned initializer calls the given closure with the pointer to the inner `T` of this
-- 
2.47.0