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-rw-r--r--include/linux/memory_hotplug.h1
-rw-r--r--kernel/cpu.c25
-rw-r--r--mm/memory_hotplug.c23
3 files changed, 49 insertions, 0 deletions
diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
index 35b07b773e6c..864035fb8f8a 100644
--- a/include/linux/memory_hotplug.h
+++ b/include/linux/memory_hotplug.h
@@ -202,6 +202,7 @@ static inline int is_mem_section_removable(unsigned long pfn,
}
#endif /* CONFIG_MEMORY_HOTREMOVE */
+extern int mem_online_node(int nid);
extern int add_memory(int nid, u64 start, u64 size);
extern int arch_add_memory(int nid, u64 start, u64 size);
extern int remove_memory(u64 start, u64 size);
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 545777574779..a3fbcc0a0abc 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -326,6 +326,12 @@ out_notify:
int __cpuinit cpu_up(unsigned int cpu)
{
int err = 0;
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+ int nid;
+ pg_data_t *pgdat;
+#endif
+
if (!cpu_possible(cpu)) {
printk(KERN_ERR "can't online cpu %d because it is not "
"configured as may-hotadd at boot time\n", cpu);
@@ -336,6 +342,25 @@ int __cpuinit cpu_up(unsigned int cpu)
return -EINVAL;
}
+#ifdef CONFIG_MEMORY_HOTPLUG
+ nid = cpu_to_node(cpu);
+ if (!node_online(nid)) {
+ err = mem_online_node(nid);
+ if (err)
+ return err;
+ }
+
+ pgdat = NODE_DATA(nid);
+ if (!pgdat) {
+ printk(KERN_ERR
+ "Can't online cpu %d due to NULL pgdat\n", cpu);
+ return -ENOMEM;
+ }
+
+ if (pgdat->node_zonelists->_zonerefs->zone == NULL)
+ build_all_zonelists();
+#endif
+
cpu_maps_update_begin();
if (cpu_hotplug_disabled) {
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index be211a582930..85eb4d342ac5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -482,6 +482,29 @@ static void rollback_node_hotadd(int nid, pg_data_t *pgdat)
}
+/*
+ * called by cpu_up() to online a node without onlined memory.
+ */
+int mem_online_node(int nid)
+{
+ pg_data_t *pgdat;
+ int ret;
+
+ lock_system_sleep();
+ pgdat = hotadd_new_pgdat(nid, 0);
+ if (pgdat) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ node_set_online(nid);
+ ret = register_one_node(nid);
+ BUG_ON(ret);
+
+out:
+ unlock_system_sleep();
+ return ret;
+}
+
/* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
int __ref add_memory(int nid, u64 start, u64 size)
{