[PATCH] pgdat allocation for new node add (specify node id)

Change the name of old add_memory() to arch_add_memory.  And use node id to
get pgdat for the node at NODE_DATA().

Note: Powerpc's old add_memory() is defined as __devinit. However,
      add_memory() is usually called only after bootup.
      I suppose it may be redundant. But, I'm not well known about powerpc.
      So, I keep it. (But, __meminit is better at least.)

Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Cc: "Brown, Len" <len.brown@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

mm/memory_hotplug.c

@@ -163,3 +163,14 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
 	vm_total_pages = nr_free_pagecache_pages();
 	return 0;
 }
+
+int add_memory(int nid, u64 start, u64 size)
+{
+	int ret;
+
+	/* call arch's memory hotadd */
+	ret = arch_add_memory(nid, start, size);
+
+	return ret;
+}
+EXPORT_SYMBOL_GPL(add_memory);