srcu: Add guards for SRCU-fast readers

This adds the usual scoped_guard(srcu_fast, &my_srcu) and
guard(srcu_fast)(&my_srcu).

Suggested-by: Steven Rostedt <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Reviewed-by: Steven Rostedt (Google) <[email protected]>
Signed-off-by: Neeraj Upadhyay (AMD) <[email protected]>

Author: paulmckrcu

include/linux/srcu.h

@@ -481,4 +481,9 @@ DEFINE_LOCK_GUARD_1(srcu, struct srcu_struct,
 		    srcu_read_unlock(_T->lock, _T->idx),
 		    int idx)
 
+DEFINE_LOCK_GUARD_1(srcu_fast, struct srcu_struct,
+		    _T->scp = srcu_read_lock_fast(_T->lock),
+		    srcu_read_unlock_fast(_T->lock, _T->scp),
+		    struct srcu_ctr __percpu *scp)
+
 #endif