1 files changed, 4 insertions, 0 deletions

diff --git a/kernel/events/internal.h b/kernel/events/internal.h
index eb675c4d59df..ca6599723be5 100644
--- a/kernel/events/internal.h
+++ b/kernel/events/internal.h
@@ -31,6 +31,10 @@ struct ring_buffer {
         spinlock_t                      event_lock;
         struct list_head                event_list;
 
+        atomic_t                        mmap_count;
+        unsigned long                   mmap_locked;
+        struct user_struct              *mmap_user;
+
         struct perf_event_mmap_page     *user_page;
         void                            *data_pages[0];
 };