1 files changed, 27 insertions, 0 deletions

diff --git a/kernel/locking/lockdep_internals.h b/kernel/locking/lockdep_internals.h
index d459d624ba2a..88c847a41c8a 100644
--- a/kernel/locking/lockdep_internals.h
+++ b/kernel/locking/lockdep_internals.h
@@ -152,9 +152,15 @@ struct lockdep_stats {
         int     nr_find_usage_forwards_recursions;
         int     nr_find_usage_backwards_checks;
         int     nr_find_usage_backwards_recursions;
+
+        /*
+         * Per lock class locking operation stat counts
+         */
+        unsigned long lock_class_ops[MAX_LOCKDEP_KEYS];
 };
 
 DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
+extern struct lock_class lock_classes[MAX_LOCKDEP_KEYS];
 
 #define __debug_atomic_inc(ptr)                                 \
         this_cpu_inc(lockdep_stats.ptr);
@@ -179,9 +185,30 @@ DECLARE_PER_CPU(struct lockdep_stats, lockdep_stats);
         }                                                               \
         __total;                                                        \
 })
+
+static inline void debug_class_ops_inc(struct lock_class *class)
+{
+        int idx;
+
+        idx = class - lock_classes;
+        __debug_atomic_inc(lock_class_ops[idx]);
+}
+
+static inline unsigned long debug_class_ops_read(struct lock_class *class)
+{
+        int idx, cpu;
+        unsigned long ops = 0;
+
+        idx = class - lock_classes;
+        for_each_possible_cpu(cpu)
+                ops += per_cpu(lockdep_stats.lock_class_ops[idx], cpu);
+        return ops;
+}
+
 #else
 # define __debug_atomic_inc(ptr)        do { } while (0)
 # define debug_atomic_inc(ptr)          do { } while (0)
 # define debug_atomic_dec(ptr)          do { } while (0)
 # define debug_atomic_read(ptr)         0
+# define debug_class_ops_inc(ptr)       do { } while (0)
 #endif