Subject: [RFC PATCH 12/12] memory-hotplug : remove sysfs file of node

From: Yasuaki Ishimatsu <[email-masked]>
Date: Wed, 27 Jun 2012 14:59:07 +0900

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

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

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

Index: linux-3.5-rc4/mm/memory_hotplug.c
===================================================================
--- linux-3.5-rc4.orig/mm/memory_hotplug.c	2012-06-26 14:32:03.630368866 +0900
+++ linux-3.5-rc4/mm/memory_hotplug.c	2012-06-26 14:39:58.090437374 +0900
@@ -702,6 +702,11 @@ int remove_memory(int nid, u64 start, u6
 	/* 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);
 	unlock_memory_hotplug();
 	return 0;