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

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Message-Id: <20251105-rust-percpu-v4-3-984b1470adcb@gmail.com>
Date: Wed, 05 Nov 2025 15:01:15 -0800
From: Mitchell Levy <levymitchell0@...il.com>
To: 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>, Yury Norov <yury.norov@...il.com>, 
 Viresh Kumar <viresh.kumar@...aro.org>
Cc: 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, Mitchell Levy <levymitchell0@...il.com>
Subject: [PATCH v4 3/9] rust: percpu: Add C bindings for per-CPU variable
 API

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>
---
 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