Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git...

[~andy/linux] / kernel / lockdep.c

diff --git a/kernel/lockdep.c b/kernel/lockdep.c
index c62ec14609b990780f7aceb1733a7ca7dd2ab945..681bc2e1e1871209f36cd54baf7e80b29117d479 100644 (file)
--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -3809,3 +3809,22 @@ 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");
+       printk("\nrcu_scheduler_active = %d, debug_locks = %d\n", rcu_scheduler_active, debug_locks);
+       lockdep_print_held_locks(curr);
+       printk("\nstack backtrace:\n");
+       dump_stack();
+}
+EXPORT_SYMBOL_GPL(lockdep_rcu_dereference);