1 files changed, 19 insertions, 1 deletions

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index 5feaddcdbe49..0c30d0455de1 100644
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -2147,7 +2147,7 @@ check_usage_backwards(struct task_struct *curr, struct held_lock *this,
                 return ret;
 
         return print_irq_inversion_bug(curr, &root, target_entry,
-                                        this, 1, irqclass);
+                                        this, 0, irqclass);
 }
 
 void print_irqtrace_events(struct task_struct *curr)
@@ -3809,3 +3809,21 @@ void lockdep_sys_exit(void)
                 lockdep_print_held_locks(curr);
         }
 }
+
+void lockdep_rcu_dereference(const char *file, const int line)
+{
+        struct task_struct *curr = current;
+
+        if (!debug_locks_off())
+                return;
+        printk("\n===================================================\n");
+        printk(  "[ INFO: suspicious rcu_dereference_check() usage. ]\n");
+        printk(  "---------------------------------------------------\n");
+        printk("%s:%d invoked rcu_dereference_check() without protection!\n",
+                        file, line);
+        printk("\nother info that might help us debug this:\n\n");
+        lockdep_print_held_locks(curr);
+        printk("\nstack backtrace:\n");
+        dump_stack();
+}
+EXPORT_SYMBOL_GPL(lockdep_rcu_dereference);