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

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Message-Id: <87372128-2734-4402-B46F-EF81ECEE546A@collabora.com>
Date: Fri, 21 Feb 2025 13:01:16 -0300
From: Daniel Almeida <daniel.almeida@...labora.com>
To: Andreas Hindborg <a.hindborg@...nel.org>
Cc: 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>,
 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>,
 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: Re: [PATCH v7 3/6] rust: str: implement `AsRef<BStr>` for `[u8]` and
 `BStr`



> On 18 Feb 2025, at 10:00, Andreas Hindborg <a.hindborg@...nel.org> wrote:
> 
> 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
> +    }
> +}

Why do you need this last one?

> +
> /// Creates a new [`BStr`] from a string literal.
> ///
> /// `b_str!` converts the supplied string literal to byte string, so non-ASCII
> 
> -- 
> 2.47.0
> 
> 
>