vmscan: protect zone rotation stats by lru lock

The zone's rotation statistics must not be accessed without the
corresponding LRU lock held. Fix an unprotected write in
shrink_active_list().

Acked-by: Rik van Riel <[e-mail]>
Reviewed-by: KOSAKI Motohiro <[e-mail]>
Signed-off-by: Johannes Weiner <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

mm/vmscan.c

···
 		list_add(&page->lru, &l_inactive);
 	}
 
+	spin_lock_irq(&zone->lru_lock);
 	/*
 	 * Count referenced pages from currently used mappings as
 	 * rotated, even though they are moved to the inactive list.
···
 
 	pgmoved = 0;
 	lru = LRU_BASE + file * LRU_FILE;
-	spin_lock_irq(&zone->lru_lock);
 	while (!list_empty(&l_inactive)) {
 		page = lru_to_page(&l_inactive);
 		prefetchw_prev_lru_page(page, &l_inactive, flags);