Add a method to `Page` that allows construction of an instance from `struct page` pointer.
Signed-off-by: Andreas Hindborg <[email protected]> --- rust/kernel/page.rs | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/rust/kernel/page.rs b/rust/kernel/page.rs index 4591b7b01c3d2..803f3e3d76b22 100644 --- a/rust/kernel/page.rs +++ b/rust/kernel/page.rs @@ -191,6 +191,17 @@ 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: *const bindings::page) -> &'a Self { + // SAFETY: By function safety requirements, ptr is not null and is + // valid for use as a reference. + unsafe { &*Opaque::cast_from(ptr).cast::<Self>() } + } + /// Runs a piece of code with this page mapped to an address. /// /// The page is unmapped when this call returns. -- 2.51.2
