1 files changed, 8 insertions, 0 deletions

diff --git a/mm/rmap.c b/mm/rmap.c
index e5dfe2ae6b0d..003377e24232 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -1475,7 +1475,15 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
                         /*
                          * No need to invalidate here it will synchronize on
                          * against the special swap migration pte.
+                         *
+                         * The assignment to subpage above was computed from a
+                         * swap PTE which results in an invalid pointer.
+                         * Since only PAGE_SIZE pages can currently be
+                         * migrated, just set it to page. This will need to be
+                         * changed when hugepage migrations to device private
+                         * memory are supported.
                          */
+                        subpage = page;
                         goto discard;
                 }