linux-kernel - [PATCH v2 03/14] rust: sync: add `Arc::as

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Message-ID: <20240917222739.1298275-4-a.hindborg@kernel.org>
Date: Wed, 18 Sep 2024 00:27:27 +0200
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>,
	Alex Gaynor <alex.gaynor@...il.com>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Cc: Andreas Hindborg <a.hindborg@...nel.org>,
	Boqun Feng <boqun.feng@...il.com>,
	Gary Guo <gary@...yguo.net>,
	Björn Roy Baron <bjorn3_gh@...tonmail.com>,
	Benno Lossin <benno.lossin@...ton.me>,
	Alice Ryhl <aliceryhl@...gle.com>,
	rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 03/14] rust: sync: add `Arc::as_ptr`

Add a method to get a pointer to the data contained in an `Arc`.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/sync/arc.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index 3673496c2363..a57ea3e2b44c 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -258,6 +258,14 @@ pub fn into_raw(self) -> *const T {
         unsafe { core::ptr::addr_of!((*ptr).data) }
     }
 
+    /// Return a raw pointer to the data in this arc.
+    pub fn as_ptr(&self) -> *const T {
+        let ptr = self.ptr.as_ptr();
+        // SAFETY: As we derive the pointer from a reference above, the pointer
+        // must be valid.
+        unsafe { core::ptr::addr_of!((*ptr).data) }
+    }
+
     /// Recreates an [`Arc`] instance previously deconstructed via [`Arc::into_raw`].
     ///
     /// # Safety
-- 
2.46.0