memory-hotplug: add build zonelists when offline pages

From: Xishi Qiu <[email protected]>

online_pages() does build_all_zonelists() and zone_pcp_update(), I think offline_pages() should do it too.
When the zone has no memory to allocate, remove it form other nodes' zonelists. zone_batchsize() depends on zone's present pages, if zone's present pages are changed, zone's pcp should be updated.

---
 mm/memory_hotplug.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

index bc7e7a2..5f6997f 100644
@@ -973,8 +973,13 @@ repeat:
 
 	init_per_zone_wmark_min();
 
-	if (!populated_zone(zone))
+	if (!populated_zone(zone)) {
 		zone_pcp_reset(zone);
+		mutex_lock(&zonelists_mutex);
+		build_all_zonelists(NULL, NULL);
+		mutex_unlock(&zonelists_mutex);
+	} else
+		zone_pcp_update(zone);
 
 	if (!node_present_pages(node)) {
 		node_clear_state(node, N_HIGH_MEMORY);

1.7.6.1

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