Update from upstream with manual merge of Yasunori Goto's

changes to swiotlb.c made in commit 281dd25cdc0d6903929b79183816d151ea626341
since this file has been moved from arch/ia64/lib/swiotlb.c to
lib/swiotlb.c

Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/mremap.c b/mm/mremap.c
index a32fed454bd7..f343fc73a8bd 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -141,10 +141,10 @@ move_one_page(struct vm_area_struct *vma, unsigned long old_addr,
                         if (dst) {
                                 pte_t pte;
                                 pte = ptep_clear_flush(vma, old_addr, src);
+
                                 /* ZERO_PAGE can be dependant on virtual addr */
-                                if (pfn_valid(pte_pfn(pte)) &&
-                                        pte_page(pte) == ZERO_PAGE(old_addr))
-                                        pte = pte_wrprotect(mk_pte(ZERO_PAGE(new_addr), new_vma->vm_page_prot));
+                                pte = move_pte(pte, new_vma->vm_page_prot,
+                                                        old_addr, new_addr);
                                 set_pte_at(mm, new_addr, dst, pte);
                         } else
                                 error = -ENOMEM;