- return __count_immobile_pages(zone, page, 0);
-}
-
-int set_migratetype_isolate(struct page *page)
-{
- struct zone *zone;
- unsigned long flags, pfn;
- struct memory_isolate_notify arg;
- int notifier_ret;
- int ret = -EBUSY;
-
- zone = page_zone(page);
-
- spin_lock_irqsave(&zone->lock, flags);
-
- pfn = page_to_pfn(page);
- arg.start_pfn = pfn;
- arg.nr_pages = pageblock_nr_pages;
- arg.pages_found = 0;
-
- /*
- * It may be possible to isolate a pageblock even if the
- * migratetype is not MIGRATE_MOVABLE. The memory isolation
- * notifier chain is used by balloon drivers to return the
- * number of pages in a range that are held by the balloon
- * driver to shrink memory. If all the pages are accounted for
- * by balloons, are free, or on the LRU, isolation can continue.
- * Later, for example, when memory hotplug notifier runs, these
- * pages reported as "can be isolated" should be isolated(freed)
- * by the balloon driver through the memory notifier chain.
- */
- notifier_ret = memory_isolate_notify(MEM_ISOLATE_COUNT, &arg);
- notifier_ret = notifier_to_errno(notifier_ret);
- if (notifier_ret)
- goto out;
- /*
- * FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
- * We just check MOVABLE pages.
- */
- if (__count_immobile_pages(zone, page, arg.pages_found))
- ret = 0;
-
- /*
- * immobile means "not-on-lru" paes. If immobile is larger than
- * removable-by-driver pages reported by notifier, we'll fail.
- */
-
-out:
- if (!ret) {
- set_pageblock_migratetype(page, MIGRATE_ISOLATE);
- move_freepages_block(zone, page, MIGRATE_ISOLATE);
- }
-
- spin_unlock_irqrestore(&zone->lock, flags);
- if (!ret)
- drain_all_pages();
- return ret;
-}
-
-void unset_migratetype_isolate(struct page *page, unsigned migratetype)
-{
- struct zone *zone;
- unsigned long flags;
- zone = page_zone(page);
- spin_lock_irqsave(&zone->lock, flags);
- if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
- goto out;
- set_pageblock_migratetype(page, migratetype);
- move_freepages_block(zone, page, migratetype);
-out:
- spin_unlock_irqrestore(&zone->lock, flags);