1 files changed, 1 insertions, 0 deletions

diff --git a/include/linux/rmap.h b/include/linux/rmap.h
index 5f981be61416..41fa6ddc6214 100644
--- a/include/linux/rmap.h
+++ b/include/linux/rmap.h
@@ -26,6 +26,7 @@
  */
 struct anon_vma {
         spinlock_t lock;        /* Serialize access to vma list */
+        struct anon_vma *root;  /* Root of this anon_vma tree */
 #if defined(CONFIG_KSM) || defined(CONFIG_MIGRATION)
 
         /*