On Wed, Aug 4, 2021 at 8:27 AM Kirill A. Shutemov [off-list ref]
wrote:

On Sat, Jul 31, 2021 at 12:39:38AM -0600, Yu Zhao wrote:

quoted

@@ -267,13 +308,19 @@ static bool remove_migration_pte(struct page

*page, struct vm_area_struct *vma,

quoted

  * Get rid of all migration entries and replace them by
  * references to the indicated page.
  */
-void remove_migration_ptes(struct page *old, struct page *new, bool

locked)

quoted

+void remove_migration_ptes(struct page *old, struct page *new, bool

locked, bool unmap_clean)

quoted

 {
+     struct rmap_walk_arg rmap_walk_arg = {
+             .page = old,
+             .unmap_clean = unmap_clean,
+     };
      struct rmap_walk_control rwc = {
              .rmap_one = remove_migration_pte,
-             .arg = old,
+             .arg = &rmap_walk_arg,
      };

'old' pointer has few low always-zero bit :P

Will do. Thanks.