linux-kernel - [PATCH] rust: page: add `from

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Message-Id: <20260128-page-from-raw-v1-1-b837bd3e0545@kernel.org>
Date: Wed, 28 Jan 2026 14:22:06 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Alice Ryhl <aliceryhl@...gle.com>, 
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, 
 "Liam R. Howlett" <Liam.Howlett@...cle.com>, 
 Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>, 
 Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <lossin@...nel.org>, Trevor Gross <tmgross@...ch.edu>, 
 Danilo Krummrich <dakr@...nel.org>
Cc: linux-mm@...ck.org, rust-for-linux@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Andreas Hindborg <a.hindborg@...nel.org>, 
 Andreas Hindborg <a.hindborg@...nel.org>
Subject: [PATCH] rust: page: add `from_raw()`

Add a method to `Page` that allows construction of a reference instance
from `struct page` pointer.

Signed-off-by: Andreas Hindborg <a.hindborg@...sung.com>
---
Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/page.rs | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/rust/kernel/page.rs b/rust/kernel/page.rs
index 432fc0297d4a8..f666c92fcf451 100644
--- a/rust/kernel/page.rs
+++ b/rust/kernel/page.rs
@@ -176,6 +176,17 @@ pub fn nid(&self) -> i32 {
         unsafe { bindings::page_to_nid(self.as_ptr()) }
     }

+    /// Create a `&Page` from a raw `struct page` pointer
+    ///
+    /// # Safety
+    ///
+    /// `ptr` must be valid for use as a reference for the duration of `'a`.
+    pub unsafe fn from_raw<'a>(ptr: *mut bindings::page) -> &'a Self {
+        // SAFETY: By function safety requirements, ptr is not null and is
+        // valid for use as a reference.
+        unsafe { NonNull::new_unchecked(ptr).cast().as_ref() }
+    }
+
     /// Runs a piece of code with this page mapped to an address.
     ///
     /// The page is unmapped when this call returns.

---
base-commit: 63804fed149a6750ffd28610c5c1c98cce6bd377
change-id: 20260128-page-from-raw-e8e1f14e3f6d

Best regards,
-- 
Andreas Hindborg <a.hindborg@...nel.org>