linux-kernel - Re: [PATCH v5 2/4] rust: add bindings for bitops.h

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Message-ID: <Z92OKn8V_PBEjNme@thinkpad>
Date: Fri, 21 Mar 2025 12:04:58 -0400
From: Yury Norov <yury.norov@...il.com>
To: Burak Emir <bqe@...gle.com>
Cc: Rasmus Villemoes <linux@...musvillemoes.dk>,
	Viresh Kumar <viresh.kumar@...aro.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>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 2/4] rust: add bindings for bitops.h

On Fri, Mar 21, 2025 at 11:15:30AM +0000, Burak Emir wrote:
> Makes atomic set_bit and clear_bit inline functions as well as the
> non-atomic variants __set_bit and __clear_bit available to Rust.
> Adds a new MAINTAINERS section BITOPS API BINDINGS [RUST].
> 
> Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Burak Emir <bqe@...gle.com>
> ---
>  MAINTAINERS            |  5 +++++
>  rust/helpers/bitops.c  | 23 +++++++++++++++++++++++
>  rust/helpers/helpers.c |  1 +
>  3 files changed, 29 insertions(+)
>  create mode 100644 rust/helpers/bitops.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 52fc47a28b4c..7cd15c25a43c 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4128,6 +4128,11 @@ F:	include/linux/bitops.h
>  F:	lib/test_bitops.c
>  F:	tools/*/bitops*
>  
> +BITOPS API BINDINGS [RUST]
> +M:	Yury Norov <yury.norov@...il.com>
> +S:	Maintained
> +F:	rust/helpers/bitops.c
> +
>  BLINKM RGB LED DRIVER
>  M:	Jan-Simon Moeller <jansimon.moeller@....de>
>  S:	Maintained
> diff --git a/rust/helpers/bitops.c b/rust/helpers/bitops.c
> new file mode 100644
> index 000000000000..2eaab292db4f
> --- /dev/null
> +++ b/rust/helpers/bitops.c
> @@ -0,0 +1,23 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/bitops.h>
> +
> +void rust_helper___set_bit(unsigned int nr, unsigned long *addr)
> +{
> +	__set_bit(nr, addr);
> +}
> +
> +void rust_helper___clear_bit(unsigned int nr, unsigned long *addr)
> +{
> +	__clear_bit(nr, addr);
> +}
> +
> +void rust_helper_set_bit(unsigned int nr, unsigned long *addr)

volatile

> +{
> +	set_bit(nr, addr);
> +}
> +
> +void rust_helper_clear_bit(unsigned int nr, unsigned long *addr)
> +{
> +	clear_bit(nr, addr);
> +}
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index d4a60f1d6cc4..0c25cc86a52a 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -8,6 +8,7 @@
>   */
>  
>  #include "bitmap.c"
> +#include "bitops.c"
>  #include "blk.c"
>  #include "bug.c"
>  #include "build_assert.c"
> -- 
> 2.49.0.395.g12beb8f557-goog