linux-kernel - Re: [PATCH v2 2/3] rust: configfs: introduce rust support for configfs

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Message-ID: <87seodt43p.fsf@kernel.org>
Date: Mon, 17 Feb 2025 08:36:26 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
To: "Charalampos Mitrodimas" <charmitro@...teo.net>
Cc: "Danilo Krummrich" <dakr@...nel.org>,  "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>,
  "Joel Becker" <jlbec@...lplan.org>,  "Christoph Hellwig" <hch@....de>,
  "Peter Zijlstra" <peterz@...radead.org>,  "Ingo Molnar"
 <mingo@...hat.com>,  "Will Deacon" <will@...nel.org>,  "Waiman Long"
 <longman@...hat.com>,  "Fiona Behrens" <me@...enk.dev>,
  <rust-for-linux@...r.kernel.org>,  <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] rust: configfs: introduce rust support for configfs

"Charalampos Mitrodimas" <charmitro@...teo.net> writes:

> Andreas Hindborg <a.hindborg@...nel.org> writes:
>
>> diff --git a/samples/rust/rust_configfs.rs b/samples/rust/rust_configfs.rs
>> new file mode 100644
>> index 0000000000000..fe896e66efb41
>> --- /dev/null
>> +++ b/samples/rust/rust_configfs.rs
>> @@ -0,0 +1,186 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +
>> +//! Rust configfs sample.
>> +
>> +use kernel::alloc::flags;
>> +use kernel::c_str;
>
> [...snip...]
>
>> +impl Configuration {
>> +    fn new() -> impl PinInit<Self, Error> {
>> +        try_pin_init!(Self {
>> +            message: c_str!("Hello World\n"),
>> +            bar <- new_mutex!((KBox::new([0;4096], flags::GFP_KERNEL)?,0)),
>> +        })
>> +    }
>> +}
>> +
>> +impl kernel::InPlaceModule for RustConfigfs {
>> +    fn init(_module: &'static ThisModule) -> impl PinInit<Self, Error> {
>> +        pr_info!("Rust configfs sample (init)\n");
>> +
>> +        let item_type = configfs_attrs! {
>> +            container: configfs::Subsystem<Configuration>,
>> +            data: Configuration,
>> +            child: Child,
>> +            attributes: [
>> +                message: 0,
>> +                bar: 1,
>> +            ],
>> +        };
>> +
>> +        try_pin_init!(Self {
>> +            config <- configfs::Subsystem::new(
>> +                kernel::c_str!("rust_configfs"), item_type, Configuration::new()
>
> Hi Andreas,
>
> One more nit I found, "kernel::c_str" is already imported in the
> sample. So this can be changed to "c_str!("rust_configfs")".

Thanks!


Best regards,
Andreas Hindborg