linux-kernel - Re: [PATCH v4 3/9] rust: percpu: Add C bindings for per-CPU variable API

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Message-ID: <aQ1D-skdKLV6xmJo@yury>
Date: Thu, 6 Nov 2025 19:57:30 -0500
From: Yury Norov <yury.norov@...il.com>
To: Mitchell Levy <levymitchell0@...il.com>
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>,
	Andreas Hindborg <a.hindborg@...nel.org>,
	Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dennis Zhou <dennis@...nel.org>, Tejun Heo <tj@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Danilo Krummrich <dakr@...nel.org>,
	Benno Lossin <lossin@...nel.org>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	Tyler Hicks <code@...icks.com>,
	Allen Pais <apais@...ux.microsoft.com>,
	linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v4 3/9] rust: percpu: Add C bindings for per-CPU variable
 API

On Wed, Nov 05, 2025 at 03:01:15PM -0800, Mitchell Levy wrote:
> Add bindings necessary to implement a Rust per-CPU variable API,
> specifically per-CPU variable allocation and management of CPU
> preemption.
> 
> Signed-off-by: Mitchell Levy <levymitchell0@...il.com>

Acked-by: Yury Norov (NVIDIA) <yury.norov@...il.com>

> ---
>  rust/helpers/helpers.c |  2 ++
>  rust/helpers/percpu.c  |  9 +++++++++
>  rust/helpers/preempt.c | 14 ++++++++++++++
>  3 files changed, 25 insertions(+)
> 
> diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
> index 7cf7fe95e41d..2fc8d26cfe66 100644
> --- a/rust/helpers/helpers.c
> +++ b/rust/helpers/helpers.c
> @@ -31,9 +31,11 @@
>  #include "of.c"
>  #include "page.c"
>  #include "pci.c"
> +#include "percpu.c"
>  #include "pid_namespace.c"
>  #include "platform.c"
>  #include "poll.c"
> +#include "preempt.c"
>  #include "property.c"
>  #include "rbtree.c"
>  #include "rcu.c"
> diff --git a/rust/helpers/percpu.c b/rust/helpers/percpu.c
> new file mode 100644
> index 000000000000..a091389f730f
> --- /dev/null
> +++ b/rust/helpers/percpu.c
> @@ -0,0 +1,9 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/percpu.h>
> +
> +void __percpu *rust_helper_alloc_percpu(size_t sz, size_t align)
> +{
> +	return __alloc_percpu(sz, align);
> +}
> +
> diff --git a/rust/helpers/preempt.c b/rust/helpers/preempt.c
> new file mode 100644
> index 000000000000..2c7529528ddd
> --- /dev/null
> +++ b/rust/helpers/preempt.c
> @@ -0,0 +1,14 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <linux/preempt.h>
> +
> +void rust_helper_preempt_disable(void)
> +{
> +	preempt_disable();
> +}
> +
> +void rust_helper_preempt_enable(void)
> +{
> +	preempt_enable();
> +}
> +
> 
> -- 
> 2.34.1