1 files changed, 4 insertions, 1 deletions

diff --git a/include/linux/perf_counter.h b/include/linux/perf_counter.h
index 41aed4270057..f776851f8c4b 100644
--- a/include/linux/perf_counter.h
+++ b/include/linux/perf_counter.h
@@ -358,10 +358,13 @@ struct perf_mmap_data {
         struct rcu_head                 rcu_head;
         int                             nr_pages;       /* nr of data pages  */
 
-        atomic_t                        wakeup;         /* POLL_ for wakeups */
+        atomic_t                        poll;           /* POLL_ for wakeups */
         atomic_t                        head;           /* write position    */
         atomic_t                        events;         /* event limit       */
 
+        atomic_t                        wakeup_head;    /* completed head    */
+        atomic_t                        lock;           /* concurrent writes */
+
         struct perf_counter_mmap_page   *user_page;
         void                            *data_pages[0];
 };