rust: lock: introduce `Mutex`

This is the `struct mutex` lock backend and allows Rust code to use the
kernel mutex idiomatically.

Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Waiman Long <[email protected]>
Reviewed-by: Martin Rodriguez Reboredo <[email protected]>
Signed-off-by: Wedson Almeida Filho <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Miguel Ojeda <[email protected]>

1 files changed, 7 insertions, 0 deletions

diff --git a/rust/helpers.c b/rust/helpers.c
index 04b9be46e887..86af099d2d66 100644
--- a/rust/helpers.c
+++ b/rust/helpers.c
@@ -22,6 +22,7 @@
 #include <linux/build_bug.h>
 #include <linux/err.h>
 #include <linux/refcount.h>
+#include <linux/mutex.h>
 
 __noreturn void rust_helper_BUG(void)
 {
@@ -29,6 +30,12 @@ __noreturn void rust_helper_BUG(void)
 }
 EXPORT_SYMBOL_GPL(rust_helper_BUG);
 
+void rust_helper_mutex_lock(struct mutex *lock)
+{
+	mutex_lock(lock);
+}
+EXPORT_SYMBOL_GPL(rust_helper_mutex_lock);
+
 refcount_t rust_helper_REFCOUNT_INIT(int n)
 {
 	return (refcount_t)REFCOUNT_INIT(n);