[PATCH v12 1/6] rust: add C wrappers for ww_mutex inline functions

["Onur Özkan" <work@onurozkan.dev>]

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.

Reviewed-by: Daniel Almeida <daniel.almeida@collabora.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Onur Özkan <work@onurozkan.dev>
---
 MAINTAINERS             |  1 +
 rust/helpers/helpers.c  |  1 +
 rust/helpers/ww_mutex.c | 33 +++++++++++++++++++++++++++++++++
 3 files changed, 35 insertions(+)
 create mode 100644 rust/helpers/ww_mutex.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 47946f1c507b9..198bb740f7cc2 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -15283,6 +15283,7 @@ 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 440fb7638e3cb..0287064c82c18 100644
--- a/rust/helpers/helpers.c
+++ b/rust/helpers/helpers.c
@@ -105,4 +105,5 @@
 #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 0000000000000..e7aa65ac58745
--- /dev/null
+++ b/rust/helpers/ww_mutex.c
@@ -0,0 +1,33 @@
+// 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
+bool rust_helper_ww_mutex_is_locked(struct ww_mutex *lock)
+{
+	return ww_mutex_is_locked(lock);
+}
-- 
2.51.2