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

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Date:	Wed, 27 Jun 2012 14:59:07 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>
CC:	<len.brown@...el.com>, <benh@...nel.crashing.org>,
	<paulus@...ba.org>, <cl@...ux.com>, <minchan.kim@...il.com>,
	<akpm@...ux-foundation.org>, <kosaki.motohiro@...fujitsu.com>,
	<wency@...fujitsu.com>
Subject: [RFC PATCH 12/12] memory-hotplug : remove sysfs file of node

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

CC: Len Brown <len.brown@...el.com>
CC: Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC: Paul Mackerras <paulus@...ba.org>
CC: Christoph Lameter <cl@...ux.com>
Cc: Minchan Kim <minchan.kim@...il.com>
CC: Andrew Morton <akpm@...ux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
CC: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

---
 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;

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