1 files changed, 1 insertions, 1 deletions

diff --git a/mm/ksm.c b/mm/ksm.c
index eb9f6806ed51..da6037c261f1 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -325,7 +325,7 @@ static void drop_anon_vma(struct rmap_item *rmap_item)
 {
         struct anon_vma *anon_vma = rmap_item->anon_vma;
 
-        if (atomic_dec_and_lock(&anon_vma->external_refcount, &anon_vma->lock)) {
+        if (atomic_dec_and_lock(&anon_vma->external_refcount, &anon_vma->root->lock)) {
                 int empty = list_empty(&anon_vma->head);
                 anon_vma_unlock(anon_vma);
                 if (empty)