linux-kernel - [PATCH v9 1/7] rust: add C wrappers for ww

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Message-ID: <20260102175302.194435-2-work@onurozkan.dev>
Date: Fri,  2 Jan 2026 20:52:56 +0300
From: Onur Özkan <work@...rozkan.dev>
To: rust-for-linux@...r.kernel.org
Cc: lossin@...nel.org,
	lyude@...hat.com,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	dakr@...nel.org,
	peterz@...radead.org,
	mingo@...hat.com,
	will@...nel.org,
	longman@...hat.com,
	felipe_life@...e.com,
	daniel@...lak.dev,
	daniel.almeida@...labora.com,
	thomas.hellstrom@...ux.intel.com,
	linux-kernel@...r.kernel.org,
	Onur Özkan <work@...rozkan.dev>
Subject: [PATCH v9 1/7] rust: add C wrappers for ww_mutex inline functions

Some of the kernel's `ww_mutex` functions are implemented as
`static inline`, so they are inaccessible from Rust as bindgen
can't generate code on them. This patch provides C function wrappers
around these inline implementations, so bindgen can see them and
generate the corresponding Rust code.

Signed-off-by: Onur Özkan <work@...rozkan.dev>
---
 MAINTAINERS             |  1 +
 rust/helpers/helpers.c  |  1 +
 rust/helpers/ww_mutex.c | 45 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 47 insertions(+)
 create mode 100644 rust/helpers/ww_mutex.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 765ad2daa218..d245b7b38b21 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -14728,6 +14728,7 @@ F:	kernel/locking/
 F:	lib/locking*.[ch]
 F:	rust/helpers/mutex.c
 F:	rust/helpers/spinlock.c
+F:	rust/helpers/ww_mutex.c
 F:	rust/kernel/sync/lock.rs
 F:	rust/kernel/sync/lock/
 F:	rust/kernel/sync/locked_by.rs
diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 79c72762ad9c..a95fb3abaab3 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -61,4 +61,5 @@
 #include "vmalloc.c"
 #include "wait.c"
 #include "workqueue.c"
+#include "ww_mutex.c"
 #include "xarray.c"
diff --git a/rust/helpers/ww_mutex.c b/rust/helpers/ww_mutex.c
new file mode 100644
index 000000000000..2ea19aafbd4e
--- /dev/null
+++ b/rust/helpers/ww_mutex.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ww_mutex.h>
+
+__rust_helper
+void rust_helper_ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
+{
+	ww_mutex_init(lock, ww_class);
+}
+
+__rust_helper
+void rust_helper_ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
+{
+	ww_acquire_init(ctx, ww_class);
+}
+
+__rust_helper
+void rust_helper_ww_acquire_done(struct ww_acquire_ctx *ctx)
+{
+	ww_acquire_done(ctx);
+}
+
+__rust_helper
+void rust_helper_ww_acquire_fini(struct ww_acquire_ctx *ctx)
+{
+	ww_acquire_fini(ctx);
+}
+
+__rust_helper
+void rust_helper_ww_mutex_lock_slow(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+	ww_mutex_lock_slow(lock, ctx);
+}
+
+__rust_helper
+int rust_helper_ww_mutex_lock_slow_interruptible(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+	return ww_mutex_lock_slow_interruptible(lock, ctx);
+}
+
+__rust_helper
+bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
+{
+	return ww_mutex_is_locked(lock);
+}
-- 
2.51.2