locking/spinlock: introduce spin_lock_init_with_key

Rust cannot call C macros, so it has its own macro to create a new lock
class when a spin lock is initialised. This new function allows Rust
code to pass the lock class it generates to the C implementation.

Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Waiman Long <[email protected]>
Signed-off-by: Wedson Almeida Filho <[email protected]>

Author: wedsonaf

include/linux/spinlock.h

@@ -327,12 +327,17 @@ static __always_inline raw_spinlock_t *spinlock_check(spinlock_t *lock)
 
 #ifdef CONFIG_DEBUG_SPINLOCK
 
+static inline void spin_lock_init_with_key(spinlock_t *lock, const char *name,
+					   struct lock_class_key *key)
+{
+	__raw_spin_lock_init(spinlock_check(lock), name, key, LD_WAIT_CONFIG);
+}
+
 # define spin_lock_init(lock)					\
 do {								\
 	static struct lock_class_key __key;			\
 								\
-	__raw_spin_lock_init(spinlock_check(lock),		\
-			     #lock, &__key, LD_WAIT_CONFIG);	\
+	spin_lock_init_with_key(lock, #lock, &__key);		\
 } while (0)
 
 #else