The patch adds node_set_offline() and unregister_one_node() to remove_memory()
for removing sysfs file of node.

CC: David Rientjes <[email protected]>
CC: Jiang Liu <[email protected]>
CC: Len Brown <[email protected]>
CC: Benjamin Herrenschmidt <[email protected]>
CC: Paul Mackerras <[email protected]> 
CC: Christoph Lameter <[email protected]>
Cc: Minchan Kim <[email protected]>
CC: Andrew Morton <[email protected]>
CC: KOSAKI Motohiro <[email protected]> 
CC: Wen Congyang <[email protected]>
Signed-off-by: Yasuaki Ishimatsu <[email protected]>

---
 mm/memory_hotplug.c |    5 +++++
 1 file changed, 5 insertions(+)

Index: linux-3.5-rc6/mm/memory_hotplug.c
===================================================================
--- linux-3.5-rc6.orig/mm/memory_hotplug.c      2012-07-18 18:25:11.036597977 
+0900
+++ linux-3.5-rc6/mm/memory_hotplug.c   2012-07-18 18:25:54.860050109 +0900
@@ -1048,6 +1048,11 @@ int __ref remove_memory(int nid, u64 sta
        /* remove memmap entry */
        firmware_map_remove(start, start + size, "System RAM");
 
+       if (!node_present_pages(nid)) {
+               node_set_offline(nid);
+               unregister_one_node(nid);
+       }
+
        __remove_pages(start >> PAGE_SHIFT, size >> PAGE_SHIFT);
 out:
        unlock_memory_hotplug();

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