mm/migrate: add comment about permanent failure path

[platform/adaptation/renesas_rcar/renesas_kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index f9e1635..626ca3c 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -1125,7 +1125,12 @@ int migrate_pages(struct list_head *from, new_page_t get_new_page,
                                nr_succeeded++;
                                break;
                        default:
-                               /* Permanent failure */
+                               /*
+                                * Permanent failure (-EBUSY, -ENOSYS, etc.):
+                                * unlike -EAGAIN case, the failed page is
+                                * removed from migration page list and not
+                                * retried in the next outer loop.
+                                */
                                nr_failed++;
                                break;
                        }