mm: save soft-dirty bits on file pages

[linux.git] / mm / rmap.c

diff --git a/mm/rmap.c b/mm/rmap.c
index 83325b80142b7c9a862cd0d56cf1e4c36be04864..b2e29acd7e3d6267a626f7bde5656c4f7fd49640 100644 (file)
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1405,8 +1405,12 @@ static int try_to_unmap_cluster(unsigned long cursor, unsigned int *mapcount,
                pteval = ptep_clear_flush(vma, address, pte);
 
                /* If nonlinear, store the file page offset in the pte. */
-               if (page->index != linear_page_index(vma, address))
-                       set_pte_at(mm, address, pte, pgoff_to_pte(page->index));
+               if (page->index != linear_page_index(vma, address)) {
+                       pte_t ptfile = pgoff_to_pte(page->index);
+                       if (pte_soft_dirty(pteval))
+                               pte_file_mksoft_dirty(ptfile);
+                       set_pte_at(mm, address, pte, ptfile);
+               }
 
                /* Move the dirty bit to the physical page now the pte is gone. */
                if (pte_dirty(pteval))