From f75cb6fce4c91847d3b7cf2c5fc7c8eb4bc2d8f0 Mon Sep 17 00:00:00 2001
From: Wedson Almeida Filho <wedsonaf@gmail.com>
Date: Wed, 28 Dec 2022 06:03:42 +0000
Subject: rust: sync: allow coercion from `Arc<T>` to `Arc<U>`

The coercion is only allowed if `U` is a compatible dynamically-sized
type (DST). For example, if we have some type `X` that implements trait
`Y`, then this allows `Arc<X>` to be coerced into `Arc<dyn Y>`.

Suggested-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Wedson Almeida Filho <wedsonaf@gmail.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Acked-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/lib.rs | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'rust/kernel/lib.rs')

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 1a10f7c0ddd9..4bde65e7b06b 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -13,8 +13,10 @@
 
 #![no_std]
 #![feature(allocator_api)]
+#![feature(coerce_unsized)]
 #![feature(core_ffi_c)]
 #![feature(receiver_trait)]
+#![feature(unsize)]
 
 // Ensure conditional compilation based on the kernel configuration works;
 // otherwise we may silently break things like initcall handling.
-- 
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