cpu/mem hotplug: add try_online_node() for cpu_up()

cpu_up() has #ifdef CONFIG_MEMORY_HOTPLUG code blocks, which call
mem_online_node() to put its node online if offlined and then call
build_all_zonelists() to initialize the zone list.

These steps are specific to memory hotplug, and should be managed in
mm/memory_hotplug.c.  lock_memory_hotplug() should also be held for the
whole steps.

For this reason, this patch replaces mem_online_node() with
try_online_node(), which performs the whole steps with
lock_memory_hotplug() held.  try_online_node() is named after
try_offline_node() as they have similar purpose.

There is no functional change in this patch.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 14 insertions, 2 deletions

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 5118028468eb..8285346be663 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1043,17 +1043,23 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
 }
 
 
-/*
+/**
+ * try_online_node - online a node if offlined
+ *
  * called by cpu_up() to online a node without onlined memory.
  */
-int mem_online_node(int nid)
+int try_online_node(int nid)
 {
         pg_data_t       *pgdat;
         int     ret;
 
+        if (node_online(nid))
+                return 0;
+
         lock_memory_hotplug();
         pgdat = hotadd_new_pgdat(nid, 0);
         if (!pgdat) {
+                pr_err("Cannot online node %d due to NULL pgdat\n", nid);
                 ret = -ENOMEM;
                 goto out;
         }
@@ -1061,6 +1067,12 @@ int mem_online_node(int nid)
         ret = register_one_node(nid);
         BUG_ON(ret);
 
+        if (pgdat->node_zonelists->_zonerefs->zone == NULL) {
+                mutex_lock(&zonelists_mutex);
+                build_all_zonelists(NULL, NULL);
+                mutex_unlock(&zonelists_mutex);
+        }
+
 out:
         unlock_memory_hotplug();
         return ret;