From 6d20d629c6d8575be98eeebe49a16fb2d7b32350 Mon Sep 17 00:00:00 2001
From: Wedson Almeida Filho <walmeida@microsoft.com>
Date: Tue, 11 Apr 2023 02:45:33 -0300
Subject: rust: lock: introduce `Mutex`

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

Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Will Deacon <will@kernel.org>
Cc: Waiman Long <longman@redhat.com>
Reviewed-by: Martin Rodriguez Reboredo <yakoyoku@gmail.com>
Signed-off-by: Wedson Almeida Filho <walmeida@microsoft.com>
Link: https://lore.kernel.org/r/20230411054543.21278-3-wedsonaf@gmail.com
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
---
 rust/helpers.c | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'rust/helpers.c')

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);
-- 
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