lockdep: Add statistics info for max bfs queue depth

Add BFS statistics to the existing lockdep stats.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1246201486-7308-10-git-send-email-tom.leiming@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 2 insertions, 1 deletions

diff --git a/kernel/lockdep_internals.h b/kernel/lockdep_internals.h
index b115aaa0bf35..6baa8807efdd 100644
--- a/kernel/lockdep_internals.h
+++ b/kernel/lockdep_internals.h
@@ -138,6 +138,7 @@ extern atomic_t nr_find_usage_backwards_recursions;
 #endif
 
 
+extern unsigned int max_bfs_queue_depth;
 extern unsigned long nr_list_entries;
 extern struct lock_list list_entries[MAX_LOCKDEP_ENTRIES];
 extern unsigned long bfs_accessed[];
@@ -191,7 +192,7 @@ static inline int __cq_dequeue(struct circular_queue *cq, unsigned long *elem)
         return 0;
 }
 
-static inline int __cq_get_elem_count(struct circular_queue *cq)
+static inline unsigned int  __cq_get_elem_count(struct circular_queue *cq)
 {
         return (cq->rear - cq->front)&(MAX_CIRCULAR_QUE_SIZE-1);
 }