linux-kernel - [PATCH v7 3/6] rust: str: implement `AsRef<BStr>` for `[u8]` and `BStr`

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Message-Id: <20250218-module-params-v3-v7-3-5e1afabcac1b@kernel.org>
Date: Tue, 18 Feb 2025 14:00:45 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
 Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
 Benno Lossin <benno.lossin@...ton.me>, 
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, 
 Trevor Gross <tmgross@...ch.edu>, Masahiro Yamada <masahiroy@...nel.org>, 
 Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nicolas@...sle.eu>, 
 Luis Chamberlain <mcgrof@...nel.org>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Adam Bratschi-Kaye <ark.email@...il.com>, linux-kbuild@...r.kernel.org, 
 Petr Pavlu <petr.pavlu@...e.com>, Sami Tolvanen <samitolvanen@...gle.com>, 
 Daniel Gomez <da.gomez@...sung.com>, Simona Vetter <simona.vetter@...ll.ch>, 
 Greg KH <gregkh@...uxfoundation.org>, linux-modules@...r.kernel.org
Subject: [PATCH v7 3/6] rust: str: implement `AsRef<BStr>` for `[u8]` and
 `BStr`

Implement `AsRef<BStr>` for `[u8]` and `BStr` so these can be used
interchangeably for operations on `BStr`.

Signed-off-by: Andreas Hindborg <a.hindborg@...nel.org>
---
 rust/kernel/str.rs | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/rust/kernel/str.rs b/rust/kernel/str.rs
index ba6b1a5c4f99d..c6bd2c69543dc 100644
--- a/rust/kernel/str.rs
+++ b/rust/kernel/str.rs
@@ -125,6 +125,18 @@ fn index(&self, index: Idx) -> &Self::Output {
     }
 }
 
+impl AsRef<BStr> for [u8] {
+    fn as_ref(&self) -> &BStr {
+        BStr::from_bytes(self)
+    }
+}
+
+impl AsRef<BStr> for BStr {
+    fn as_ref(&self) -> &BStr {
+        self
+    }
+}
+
 /// Creates a new [`BStr`] from a string literal.
 ///
 /// `b_str!` converts the supplied string literal to byte string, so non-ASCII

-- 
2.47.0