+ /*
+ * readahead/lru_deactivate_page could remain
+ * PG_readahead/PG_reclaim due to race with end_page_writeback
+ * About readahead, if the page is written, the flags would be
+ * reset. So no problem.
+ * About lru_deactivate_page, if the page is redirty, the flag
+ * will be reset. So no problem. but if the page is used by readahead
+ * it will confuse readahead and make it restart the size rampup
+ * process. But it's a trivial problem.
+ */
+ ClearPageReclaim(page);