1 files changed, 13 insertions, 2 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index d9d42316a99a..11cf322f8133 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1165,6 +1165,16 @@ int try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
                 }
                 set_pte_at(mm, address, pte,
                            swp_entry_to_pte(make_hwpoison_entry(page)));
+        } else if (pte_unused(pteval)) {
+                /*
+                 * The guest indicated that the page content is of no
+                 * interest anymore. Simply discard the pte, vmscan
+                 * will take care of the rest.
+                 */
+                if (PageAnon(page))
+                        dec_mm_counter(mm, MM_ANONPAGES);
+                else
+                        dec_mm_counter(mm, MM_FILEPAGES);
         } else if (PageAnon(page)) {
                 swp_entry_t entry = { .val = page_private(page) };
                 pte_t swp_pte;
@@ -1360,8 +1370,9 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
 }
 
 static int try_to_unmap_nonlinear(struct page *page,
-                struct address_space *mapping, struct vm_area_struct *vma)
+                struct address_space *mapping, void *arg)
 {
+        struct vm_area_struct *vma;
         int ret = SWAP_AGAIN;
         unsigned long cursor;
         unsigned long max_nl_cursor = 0;
@@ -1663,7 +1674,7 @@ static int rmap_walk_file(struct page *page, struct rmap_walk_control *rwc)
         if (list_empty(&mapping->i_mmap_nonlinear))
                 goto done;
 
-        ret = rwc->file_nonlinear(page, mapping, vma);
+        ret = rwc->file_nonlinear(page, mapping, rwc->arg);
 
 done:
         mutex_unlock(&mapping->i_mmap_mutex);