linux-kernel - Re: [PATCH v4 1/3] Adds bitmap.c and bitops.c Rust bindings.

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Message-ID: <Z9nAVIokrWqoRiFR@thinkpad>
Date: Tue, 18 Mar 2025 14:49:56 -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>,
	Bjorn 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 v4 1/3] Adds bitmap.c and bitops.c Rust bindings.

On Tue, Mar 18, 2025 at 05:45:45PM +0000, Burak Emir wrote:
> Adds helpers for bitmap.c and bitops.c to get Rust bindings
> for inline methods __set_bit and __clear_bit (these are
> non-atomic variants) as well as bitmap_copy_and_extend.
> 
> These are needed for providing a basic Rust Bitmap API.
> Update MAINTAINERS.
> 
> Suggested-by: Alice Ryhl <aliceryhl@...gle.com>
> Signed-off-by: Burak Emir <bqe@...gle.com>
> ---
>  MAINTAINERS                     | 11 +++++++++++
>  rust/bindings/bindings_helper.h |  1 +
>  rust/helpers/bitmap.c           |  9 +++++++++
>  rust/helpers/bitops.c           | 13 +++++++++++++
>  rust/helpers/helpers.c          |  2 ++
>  5 files changed, 36 insertions(+)
>  create mode 100644 rust/helpers/bitmap.c
>  create mode 100644 rust/helpers/bitops.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c43d66bd85f3..50f44d7e5c6e 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4029,6 +4029,12 @@ F:	tools/include/vdso/bits.h
>  F:	tools/lib/bitmap.c
>  F:	tools/lib/find_bit.c
>  
> +BITMAP API BINDINGS [RUST]
> +M:	Yury Norov <yury.norov@...il.com>
> +S:	Maintained
> +F:	rust/helpers/bitmap.c
> +F:	rust/helpers/cpumask.c

Are you sure you wrote it yourself? I checked next-20250318 quickly
and found it was me!

Please build your work on top of -next as soon as you need those
bindings.

> +
>  BITMAP API [RUST]
>  M:	Viresh Kumar <viresh.kumar@...aro.org> (cpumask)
>  R:	Yury Norov <yury.norov@...il.com>
> @@ -4049,6 +4055,11 @@ 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

Please make it a separate patch. That way I'll be able to ACK only
this record.

> +
>  BLINKM RGB LED DRIVER
>  M:	Jan-Simon Moeller <jansimon.moeller@....de>
>  S:	Maintained
> diff --git a/rust/bindings/bindings_helper.h b/rust/bindings/bindings_helper.h
> index 55354e4dec14..6bd4396b9cd3 100644
> --- a/rust/bindings/bindings_helper.h
> +++ b/rust/bindings/bindings_helper.h
> @@ -7,6 +7,7 @@
>   */
>  
>  #include <kunit/test.h>
> +#include <linux/bitmap.h>
>  #include <linux/blk-mq.h>
>  #include <linux/blk_types.h>
>  #include <linux/blkdev.h>
> diff --git a/rust/helpers/bitmap.c b/rust/helpers/bitmap.c
> new file mode 100644
> index 000000000000..a50e2f082e47
> --- /dev/null
> +++ b/rust/helpers/bitmap.c
> @@ -0,0 +1,9 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/bitmap.h>
> +
> +void rust_helper_bitmap_copy_and_extend(unsigned long *to, const unsigned long *from,
> +		unsigned int count, unsigned int size)
> +{
> +	bitmap_copy_and_extend(to, from, count, size);
> +}
> diff --git a/rust/helpers/bitops.c b/rust/helpers/bitops.c
> new file mode 100644
> index 000000000000..0ea1611b95dc
> --- /dev/null
> +++ b/rust/helpers/bitops.c
> @@ -0,0 +1,13 @@
> +// 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);
> +}
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index 0640b7e115be..74e5e10694a4 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -7,6 +7,8 @@
>   * Sorted alphabetically.
>   */
>  
> +#include "bitmap.c"
> +#include "bitops.c"
>  #include "blk.c"
>  #include "bug.c"
>  #include "build_assert.c"
> -- 
> 2.49.0.rc1.451.g8f38331e32-goog