(not to be worded as-is in final patch email) apply suggestions

Author: dingxiangfei2009

rust/kernel/lib.rs

@@ -17,7 +17,10 @@
     CONFIG_RUST_COERCE_POINTEE,
     feature(derive_coerce_pointee, pin_coerce_unsized_trait)
 )]
-#![cfg_attr(not(CONFIG_RUST_COERCE_POINTEE), feature(coerce_unsized, unsize))]
+#![cfg_attr(
+    not(CONFIG_RUST_COERCE_POINTEE),
+    feature(coerce_unsized, dispatch_from_dyn, unsize)
+)]
 #![feature(inline_const)]
 #![feature(lint_reasons)]
 

rust/kernel/sync/arc.rs

@@ -129,7 +129,7 @@ mod std_vendor;
 /// let coerced: Arc<dyn MyTrait> = obj;
 /// # Ok::<(), Error>(())
 /// ```
-#[cfg_attr(CONFIG_RUST_COERCE_POINTEE, repr(transparent))]
+#[repr(transparent)]
 #[cfg_attr(CONFIG_RUST_COERCE_POINTEE, derive(CoercePointee))]
 pub struct Arc<T: ?Sized> {
     ptr: NonNull<ArcInner<T>>,
@@ -479,7 +479,7 @@ impl<T: ?Sized> From<Pin<UniqueArc<T>>> for Arc<T> {
 /// obj.as_arc_borrow().use_reference();
 /// # Ok::<(), Error>(())
 /// ```
-#[cfg_attr(CONFIG_RUST_COERCE_POINTEE, repr(transparent))]
+#[repr(transparent)]
 #[cfg_attr(CONFIG_RUST_COERCE_POINTEE, derive(CoercePointee))]
 pub struct ArcBorrow<'a, T: ?Sized + 'a> {
     inner: NonNull<ArcInner<T>>,