lockdep: annotate rcu_read_{,un}lock{,_bh}
lockdep annotate rcu_read_{,un}lock{,_bh} in order to catch imbalanced
usage.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index 2c2dd84..130214f 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -49,6 +49,14 @@
#include <linux/cpu.h>
#include <linux/mutex.h>
+#ifdef CONFIG_DEBUG_LOCK_ALLOC
+static struct lock_class_key rcu_lock_key;
+struct lockdep_map rcu_lock_map =
+ STATIC_LOCKDEP_MAP_INIT("rcu_read_lock", &rcu_lock_key);
+
+EXPORT_SYMBOL_GPL(rcu_lock_map);
+#endif
+
/* Definition for rcupdate control block. */
static struct rcu_ctrlblk rcu_ctrlblk = {
.cur = -300,
