linux-kernel - [PATCH] Memory hot added to normal zone defaultlly in kernel 4.1.0 The memory hot added to normal zone defaultlly so we need let the memory be added to movable zone if we need remove the added memory in a node Signed-off-by: Changsheng Liu <liuchangcheng@...pur.com>

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Date:	Wed, 19 Aug 2015 03:02:06 -0400
From:	Changsheng Liu <liuchangsheng@...pur.com>
To:	<linux-kernel@...r.kernel.org>, <yanxiaofeng@...pur.com>
CC:	<liuchangsheng@...pur.com>,
	Changsheng Liu <liuchangcheng@...pur.com>
Subject: [PATCH] Memory hot added to normal zone defaultlly in kernel 4.1.0 The memory hot added to normal zone defaultlly so we need let the memory be added to movable  zone if we need remove the added memory in a node Signed-off-by: Changsheng Liu <liuchangcheng@...pur.com>

From: Changsheng Liu <liuchangcheng@...pur.com>

---
 mm/memory_hotplug.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index 26fbba7..f5bcd03 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1198,8 +1198,13 @@ static int should_add_memory_movable(int nid, u64 start, u64 size)
 	pg_data_t *pgdat = NODE_DATA(nid);
 	struct zone *movable_zone = pgdat->node_zones + ZONE_MOVABLE;
 
-	if (zone_is_empty(movable_zone))
-		return 0;
+	if (zone_is_empty(movable_zone)){
+        #ifdef CONFIG_MOVABLE_NODE
+            return 1;
+        #else
+            return 0;
+        #endif
+	}
 
 	if (movable_zone->zone_start_pfn <= start_pfn)
 		return 1;
-- 
1.7.1

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