From 1edd03378e50ff1071004c80cb878e4bad73a68f Mon Sep 17 00:00:00 2001
From: Asahi Lina <lina@asahilina.net>
Date: Mon, 3 Apr 2023 19:01:11 +0900
Subject: rust: sync: arc: Implement Arc<dyn Any + Send + Sync>::downcast()

This mirrors the standard library's alloc::sync::Arc::downcast().

Based on the Rust standard library implementation, ver 1.62.0,
licensed under "Apache-2.0 OR MIT", from:

    https://github.com/rust-lang/rust/tree/1.62.0/library/alloc/src

For copyright details, please see:

    https://github.com/rust-lang/rust/blob/1.62.0/COPYRIGHT

Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Reviewed-by: Andreas Hindborg <a.hindborg@samsung.com>
Reviewed-by: Vincenzo Palazzo <vincenzopalazzodev@gmail.com>
Reviewed-by: Gary Guo <gary@garyguo.net>
Signed-off-by: Asahi Lina <lina@asahilina.net>
Link: https://lore.kernel.org/r/20230224-rust-arc-v2-1-5c97a865b276@asahilina.net
[ Moved `mod std_vendor;` up. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/kernel/sync/arc.rs | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'rust/kernel/sync/arc.rs')

diff --git a/rust/kernel/sync/arc.rs b/rust/kernel/sync/arc.rs
index a94e303217c6..4ab9b280cb3d 100644
--- a/rust/kernel/sync/arc.rs
+++ b/rust/kernel/sync/arc.rs
@@ -30,6 +30,8 @@ use core::{
     ptr::NonNull,
 };
 
+mod std_vendor;
+
 /// A reference-counted pointer to an instance of `T`.
 ///
 /// The reference count is incremented when new instances of [`Arc`] are created, and decremented
-- 
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