1 files changed, 8 insertions, 0 deletions

diff --git a/mm/ksm.c b/mm/ksm.c
index 9f8f0523562b..81f692e836db 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -1268,6 +1268,14 @@ static void ksm_do_scan(unsigned int scan_npages)
                         return;
                 if (!PageKsm(page) || !in_stable_tree(rmap_item))
                         cmp_and_merge_page(page, rmap_item);
+                else if (page_mapcount(page) == 1) {
+                        /*
+                         * Replace now-unshared ksm page by ordinary page.
+                         */
+                        break_cow(rmap_item->mm, rmap_item->address);
+                        remove_rmap_item_from_tree(rmap_item);
+                        rmap_item->oldchecksum = calc_checksum(page);
+                }
                 put_page(page);
         }
 }