[PATCH] rust: add `ARef::into_raw`

[Alice Ryhl <aliceryhl@google.com>]

Add a method for `ARef` that is analogous to `Arc::into_raw`. It is the
inverse operation of `ARef::from_raw`, and allows you to convert the
`ARef` back into a raw pointer while retaining ownership of the
refcount.

This new function will be used by [1] for converting the type in an
`ARef` using `ARef::from_raw(ARef::into_raw(me).cast())`. The author has
also needed the same function for other use-cases in the past, but [1]
is the first to go upstream.

Link: https://lore.kernel.org/r/20240801-vma-v3-1-db6c1c0afda9@google.com [1]
Signed-off-by: Alice Ryhl <aliceryhl@google.com>
---
This change was previously included in
https://lore.kernel.org/all/20240801-vma-v3-1-db6c1c0afda9@google.com/
but is being split out in its own commit at Danilo's suggestion.
---
 rust/kernel/types.rs | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index bd189d646adb..83f20f589ef6 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -7,7 +7,7 @@
 use core::{
     cell::UnsafeCell,
     marker::{PhantomData, PhantomPinned},
-    mem::MaybeUninit,
+    mem::{ManuallyDrop, MaybeUninit},
     ops::{Deref, DerefMut},
     ptr::NonNull,
 };
@@ -366,6 +366,14 @@ pub unsafe fn from_raw(ptr: NonNull<T>) -> Self {
             _p: PhantomData,
         }
     }
+
+    /// Consumes the `ARef`, returning a raw pointer.
+    ///
+    /// This function does not change the refcount. After calling this function, the caller is
+    /// responsible for the refcount previously managed by the `ARef`.
+    pub fn into_raw(me: Self) -> NonNull<T> {
+        ManuallyDrop::new(me).ptr
+    }
 }
 
 impl<T: AlwaysRefCounted> Clone for ARef<T> {

---
base-commit: 8400291e289ee6b2bf9779ff1c83a291501f017b
change-id: 20240801-aref-into-raw-e0518131442f

Best regards,
-- 
Alice Ryhl <aliceryhl@google.com>