1 files changed, 2 insertions, 1 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index a33e779d1bd8..a7427bbf57e4 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -559,7 +559,8 @@ static int try_to_unmap_one(struct page *page, struct vm_area_struct *vma)
                 swap_duplicate(entry);
                 if (list_empty(&mm->mmlist)) {
                         spin_lock(&mmlist_lock);
-                        list_add(&mm->mmlist, &init_mm.mmlist);
+                        if (list_empty(&mm->mmlist))
+                                list_add(&mm->mmlist, &init_mm.mmlist);
                         spin_unlock(&mmlist_lock);
                 }
                 set_pte_at(mm, address, pte, swp_entry_to_pte(entry));