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rust: sync: add Arc::as_ptr

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

Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Benno 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: Andreas Hindborg <a.hindborg@kernel.org>
This commit is contained in:
Andreas Hindborg
2025-03-09 16:18:53 +01:00
parent 8a8afe9349
commit a0c6fa8b8a
1 changed files with 11 additions and 2 deletions
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13
rust/kernel/sync/arc.rs
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@@ -246,6 +246,15 @@ impl<T: ?Sized> Arc<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 @@ impl<T: ?Sized> ArcBorrow<'_, T> {
}
/// 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