linux-kernel - [PATCH 1/5] rust: Add a Sealed trait

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Message-Id: <20230224-rust-iopt-rtkit-v1-1-49ced3391295@asahilina.net>
Date:   Fri, 24 Feb 2023 19:53:13 +0900
From:   Asahi Lina <lina@...hilina.net>
To:     Miguel Ojeda <ojeda@...nel.org>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...il.com>,
        Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
        Björn Roy Baron <bjorn3_gh@...tonmail.com>,
        Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Joerg Roedel <joro@...tes.org>,
        Hector Martin <marcan@...can.st>,
        Sven Peter <sven@...npeter.dev>, Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Neal Gompa <neal@...pa.dev>, rust-for-linux@...r.kernel.org,
        linux-kernel@...r.kernel.org, asahi@...ts.linux.dev,
        Asahi Lina <lina@...hilina.net>
Subject: [PATCH 1/5] rust: Add a Sealed trait

Some traits exposed by the kernel crate may not be intended to be
implemented by downstream modules. Add a Sealed trait to allow avoiding
this using the sealed trait pattern.

Signed-off-by: Asahi Lina <lina@...hilina.net>
---
 rust/kernel/lib.rs | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/rust/kernel/lib.rs b/rust/kernel/lib.rs
index 223564f9f0cc..82dff6f4cf60 100644
--- a/rust/kernel/lib.rs
+++ b/rust/kernel/lib.rs
@@ -46,6 +46,11 @@ pub use macros;
 #[doc(hidden)]
 pub use build_error::build_error;
 
+pub(crate) mod private {
+    #[allow(unreachable_pub)]
+    pub trait Sealed {}
+}
+
 /// Prefix to appear before log messages printed from within the `kernel` crate.
 const __LOG_PREFIX: &[u8] = b"rust_kernel\0";
 

-- 
2.35.1