[PATCH v2 06/12] memory-hotplug: unregister memory section on SPARSEMEM_VMEMMAP

wency at cn.fujitsu.com wency at cn.fujitsu.com
Tue Oct 23 21:30:44 EST 2012

From: Yasuaki Ishimatsu <isimatu.yasuaki at jp.fujitsu.com>

Currently __remove_section for SPARSEMEM_VMEMMAP does nothing. But even if
we use SPARSEMEM_VMEMMAP, we can unregister the memory_section.

So the patch add unregister_memory_section() into __remove_section().

CC: David Rientjes <rientjes at google.com>
CC: Jiang Liu <liuj97 at gmail.com>
CC: Len Brown <len.brown at intel.com>
CC: Christoph Lameter <cl at linux.com>
Cc: Minchan Kim <minchan.kim at gmail.com>
CC: Andrew Morton <akpm at linux-foundation.org>
CC: KOSAKI Motohiro <kosaki.motohiro at jp.fujitsu.com>
CC: Wen Congyang <wency at cn.fujitsu.com>
Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki at jp.fujitsu.com>
 mm/memory_hotplug.c |   13 ++++++++-----
 1 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index ca07433..66a79a7 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -286,11 +286,14 @@ static int __meminit __add_section(int nid, struct zone *zone,
 static int __remove_section(struct zone *zone, struct mem_section *ms)
-	/*
-	 * XXX: Freeing memmap with vmemmap is not implement yet.
-	 *      This should be removed later.
-	 */
-	return -EBUSY;
+	int ret = -EINVAL;
+	if (!valid_section(ms))
+		return ret;
+	ret = unregister_memory_section(ms);
+	return ret;
 static int __remove_section(struct zone *zone, struct mem_section *ms)

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