Commit a0c6fa8b authored by Andreas Hindborg's avatar Andreas Hindborg
Browse files

rust: sync: add `Arc::as_ptr` 



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

Reviewed-by: default avatarLyude Paul <lyude@redhat.com>
Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Reviewed-by: default avatarBenno Lossin <benno.lossin@proton.me>
Link: https://lore.kernel.org/r/20250309-hrtimer-v3-v6-12-rc2-v12-2-73586e2bd5f1@kernel.org


Signed-off-by: default avatarAndreas Hindborg <a.hindborg@kernel.org>
parent 8a8afe93

rust/kernel/sync/arc.rs

+11 −2
Original line number Diff line number Diff line
@@ -246,6 +246,15 @@ 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(this: &Self) -> *const T {

        let ptr = this.ptr.as_ptr();



        // SAFETY: As `ptr` points to a valid allocation of type `ArcInner`,

        // field projection to `data`is within bounds of the allocation.

        unsafe { core::ptr::addr_of!((*ptr).data) }

    }



    /// Recreates an [`Arc`] instance previously deconstructed via [`Arc::into_raw`].

    ///

    /// # Safety
@@ -539,11 +548,11 @@ unsafe fn new(inner: NonNull<ArcInner<T>>) -> Self { 
    }



    /// Creates an [`ArcBorrow`] to an [`Arc`] that has previously been deconstructed with

    /// [`Arc::into_raw`].

    /// [`Arc::into_raw`] or [`Arc::as_ptr`].

    ///

    /// # Safety

    ///

    /// * The provided pointer must originate from a call to [`Arc::into_raw`].

    /// * The provided pointer must originate from a call to [`Arc::into_raw`] or [`Arc::as_ptr`].

    /// * For the duration of the lifetime annotated on this `ArcBorrow`, the reference count must

    ///   not hit zero.

    /// * For the duration of the lifetime annotated on this `ArcBorrow`, there must not be a