From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

In migration, a new page should be cache flushed before set_pte() in some
archs which have virtually-tagged cache.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/migrate.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN mm/migrate.c~flush-cache-before-installing-new-page-at-migraton mm/migrate.c
--- a/mm/migrate.c~flush-cache-before-installing-new-page-at-migraton
+++ a/mm/migrate.c
@@ -171,6 +171,7 @@ static void remove_migration_pte(struct 
 	pte = pte_mkold(mk_pte(new, vma->vm_page_prot));
 	if (is_write_migration_entry(entry))
 		pte = pte_mkwrite(pte);
+	flush_cache_page(vma, addr, pte_pfn(pte));
 	set_pte_at(mm, addr, ptep, pte);
 
 	if (PageAnon(new))
_