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-rw-r--r--mm/migrate.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index d444229f2599..1c25040693d2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -439,6 +439,17 @@ redo:
439 goto unlock_both; 439 goto unlock_both;
440 } 440 }
441 441
442 /* Make sure the dirty bit is up to date */
443 if (try_to_unmap(page, 1) == SWAP_FAIL) {
444 rc = -EPERM;
445 goto unlock_both;
446 }
447
448 if (page_mapcount(page)) {
449 rc = -EAGAIN;
450 goto unlock_both;
451 }
452
442 /* 453 /*
443 * Default handling if a filesystem does not provide 454 * Default handling if a filesystem does not provide
444 * a migration function. We can only migrate clean 455 * a migration function. We can only migrate clean