PAGE_START_WRITEBACK
if (page_ops & PAGE_START_WRITEBACK) {
PAGE_UNLOCK | PAGE_START_WRITEBACK);
PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_UNLOCK | PAGE_START_WRITEBACK |
page_ops = PAGE_UNLOCK | PAGE_START_WRITEBACK | PAGE_END_WRITEBACK;
page_ops = PAGE_UNLOCK | PAGE_START_WRITEBACK | PAGE_END_WRITEBACK;
PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_UNLOCK | PAGE_START_WRITEBACK |
PAGE_START_WRITEBACK |
PAGE_START_WRITEBACK | PAGE_END_WRITEBACK);