Subject: set VM_FAULT_WRITE in do_swap_page

From: Andrea Arcangeli <aarcange@redhat.com>

Set the flag if do_swap_page is decowing the page the same way do_wp_page would
too.

Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
---

diff --git a/mm/memory.c b/mm/memory.c
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -2730,6 +2730,7 @@ static int do_swap_page(struct mm_struct
 		flags &= ~FAULT_FLAG_WRITE;
 		/* = 2 because the swapcache may be PageAnon already */
 		exclusive = 2;
+		ret |= VM_FAULT_WRITE;
 	}
 	flush_icache_page(vma, page);
 	set_pte_at(mm, address, page_table, pte);