return 0;
}
+/* ensure every online node has NORMAL memory */
+static bool can_online_high_movable(struct zone *zone)
+{
+ return node_state(zone_to_nid(zone), N_NORMAL_MEMORY);
+}
+
/* check which state of node_states will be changed when online memory */
static void node_states_check_changes_online(unsigned long nr_pages,
struct zone *zone, struct memory_notify *arg)
*/
zone = page_zone(pfn_to_page(pfn));
+ if ((zone_idx(zone) > ZONE_NORMAL || online_type == ONLINE_MOVABLE) &&
+ !can_online_high_movable(zone)) {
+ unlock_memory_hotplug();
+ return -1;
+ }
+
if (online_type == ONLINE_KERNEL && zone_idx(zone) == ZONE_MOVABLE) {
if (move_pfn_range_left(zone - 1, zone, pfn, pfn + nr_pages)) {
unlock_memory_hotplug();
return offlined;
}
+/* ensure the node has NORMAL memory if it is still online */
+static bool can_offline_normal(struct zone *zone, unsigned long nr_pages)
+{
+ struct pglist_data *pgdat = zone->zone_pgdat;
+ unsigned long present_pages = 0;
+ enum zone_type zt;
+
+ for (zt = 0; zt <= ZONE_NORMAL; zt++)
+ present_pages += pgdat->node_zones[zt].present_pages;
+
+ if (present_pages > nr_pages)
+ return true;
+
+ present_pages = 0;
+ for (; zt <= ZONE_MOVABLE; zt++)
+ present_pages += pgdat->node_zones[zt].present_pages;
+
+ /*
+ * we can't offline the last normal memory until all
+ * higher memory is offlined.
+ */
+ return present_pages == 0;
+}
+
/* check which state of node_states will be changed when offline memory */
static void node_states_check_changes_offline(unsigned long nr_pages,
struct zone *zone, struct memory_notify *arg)
node = zone_to_nid(zone);
nr_pages = end_pfn - start_pfn;
+ ret = -EINVAL;
+ if (zone_idx(zone) <= ZONE_NORMAL && !can_offline_normal(zone, nr_pages))
+ goto out;
+
/* set above range as isolated */
ret = start_isolate_page_range(start_pfn, end_pfn,
MIGRATE_MOVABLE, true);