linux-kernel - [PATCH v6 1/7] rust: add C wrappers for ww

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Message-ID: <20250903131313.4365-2-work@onurozkan.dev>
Date: Wed,  3 Sep 2025 16:13:07 +0300
From: Onur Özkan <work@...rozkan.dev>
To: rust-for-linux@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	lossin@...nel.org,
	lyude@...hat.com,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
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	a.hindborg@...nel.org,
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	tmgross@...ch.edu,
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	daniel@...lak.dev,
	bjorn3_gh@...tonmail.com,
	daniel.almeida@...labora.com,
	Onur Özkan <work@...rozkan.dev>
Subject: [PATCH v6 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>
---
 rust/helpers/helpers.c  |  1 +
 rust/helpers/ww_mutex.c | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 rust/helpers/ww_mutex.c

diff --git a/rust/helpers/helpers.c b/rust/helpers/helpers.c
index 7cf7fe95e41d..4c789c5537b1 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -50,4 +50,5 @@
 #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..61a487653394
--- /dev/null
+++ b/rust/helpers/ww_mutex.c
@@ -0,0 +1,39 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ww_mutex.h>
+
+void rust_helper_ww_mutex_init(struct ww_mutex *lock, struct ww_class *ww_class)
+{
+	ww_mutex_init(lock, ww_class);
+}
+
+void rust_helper_ww_acquire_init(struct ww_acquire_ctx *ctx, struct ww_class *ww_class)
+{
+	ww_acquire_init(ctx, ww_class);
+}
+
+void rust_helper_ww_acquire_done(struct ww_acquire_ctx *ctx)
+{
+	ww_acquire_done(ctx);
+}
+
+void rust_helper_ww_acquire_fini(struct ww_acquire_ctx *ctx)
+{
+	ww_acquire_fini(ctx);
+}
+
+void rust_helper_ww_mutex_lock_slow(struct ww_mutex *lock, struct ww_acquire_ctx *ctx)
+{
+	ww_mutex_lock_slow(lock, ctx);
+}
+
+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);
+}
+
+bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
+{
+	return ww_mutex_is_locked(lock);
+}
+
--
2.50.0