From 0773e6115b3fbfce75488a481fa0f0e853373199 Mon Sep 17 00:00:00 2001
From: Tang Chen <tangchen@cn.fujitsu.com>
Date: Wed, 20 Feb 2013 13:14:18 +1100
Subject: [PATCH] memory-hotplug: integrated __remove_section() of
 CONFIG_SPARSEMEM_VMEMMAP.

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

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Jiang Liu <jiang.liu@huawei.com>
Cc: Jianguo Wu <wujianguo@huawei.com>
Cc: Kamezawa Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Cc: Wu Jianguo <wujianguo@huawei.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/memory_hotplug.c | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 05f5773afa1c..aad2f03e20b2 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -432,16 +432,6 @@ static int __meminit __add_section(int nid, struct zone *zone,
 	return register_new_memory(nid, __pfn_to_section(phys_start_pfn));
 }
 
-#ifdef CONFIG_SPARSEMEM_VMEMMAP
-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;
-}
-#else
 static int __remove_section(struct zone *zone, struct mem_section *ms)
 {
 	int ret = -EINVAL;
@@ -456,7 +446,6 @@ static int __remove_section(struct zone *zone, struct mem_section *ms)
 	sparse_remove_one_section(zone, ms);
 	return 0;
 }
-#endif
 
 /*
  * Reasonably generic function for adding memory.  It is
-- 
2.39.5