[PATCH v21 8/9] rust: page: add `from_raw()`
From: Andreas Hindborg <a.hindborg@kernel.org>
Date: 2026-09-10 09:01:14
Also in:
dri-devel, driver-core, linux-block, linux-fsdevel, linux-mm, linux-pci, linux-pwm, linux-security-module, linux-usb, lkml, rust-for-linux
Subsystem:
memory management - rust, rust, the rest · Maintainers:
Alice Ryhl, Miguel Ojeda, Linus Torvalds
From: Andreas Hindborg <redacted> Add a method to `Page` that allows construction of an instance from `struct page` pointer. Assisted-by: LLM Signed-off-by: Andreas Hindborg <redacted> Reviewed-by: Onur Özkan <work@onurozkan.dev> --- rust/kernel/page.rs | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/rust/kernel/page.rs b/rust/kernel/page.rs
index a2610774c749..cd394b0656c0 100644
--- a/rust/kernel/page.rs
+++ b/rust/kernel/page.rs@@ -146,6 +146,20 @@ 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 convertible to a shared reference with a lifetime of `'a`. + #[inline] + pub unsafe fn from_raw<'a>(ptr: *const bindings::page) -> &'a Self { + // INVARIANT: By the function safety requirements, `ptr` refers to a valid `struct page`, so + // the returned reference upholds the type invariant of `Page`. + // SAFETY: By function safety requirements, `ptr` is not null and is convertible to a shared + // reference. + unsafe { &*ptr.cast() } + } + /// Runs a piece of code with this page mapped to an address. /// /// The page is unmapped when this call returns.
--
2.51.2