[PATCH 1/3 v4] rust: add C wrappers for `ww_mutex` inline functions

[Onur Özkan]

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@xxxxxxxxxxxxx>
---
 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 0f1b5d115985..fd071cbe20a1 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -44,3 +44,4 @@
 #include "wait.c"
 #include "workqueue.c"
 #include "xarray.c"
+#include "ww_mutex.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);
+}
+
-- 
2.49.0