From: Wen Congyang <wency@cn.fujitsu.com>
Date: Wed, 20 Feb 2013 02:14:23 +0000 (+1100)
Subject: cpu-hotplug,memory-hotplug: clear cpu_to_node() when offlining the node
X-Git-Tag: next-20130220~1^2~516
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=7a16edbd4b3c84856d5bc78d65e2db4085fc85dd;p=karo-tx-linux.git

cpu-hotplug,memory-hotplug: clear cpu_to_node() when offlining the node

When the node is offlined, there is no memory/cpu on the node.  If a sleep
task runs on a cpu of this node, it will be migrated to the cpu on the
other node.  So we can clear cpu-to-node mapping.

Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index d4a9820edfc7..0653b97988fc 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1705,6 +1705,34 @@ static int check_cpu_on_node(void *data)
 	return 0;
 }
 
+static void unmap_cpu_on_node(void *data)
+{
+#ifdef CONFIG_ACPI_NUMA
+	struct pglist_data *pgdat = data;
+	int cpu;
+
+	for_each_possible_cpu(cpu)
+		if (cpu_to_node(cpu) == pgdat->node_id)
+			numa_clear_node(cpu);
+#endif
+}
+
+static int check_and_unmap_cpu_on_node(void *data)
+{
+	int ret = check_cpu_on_node(data);
+
+	if (ret)
+		return ret;
+
+	/*
+	 * the node will be offlined when we come here, so we can clear
+	 * the cpu_to_node() now.
+	 */
+
+	unmap_cpu_on_node(data);
+	return 0;
+}
+
 /* offline the node if all memory sections of this node are removed */
 void try_offline_node(int nid)
 {
@@ -1731,7 +1759,7 @@ void try_offline_node(int nid)
 		return;
 	}
 
-	if (stop_machine(check_cpu_on_node, pgdat, NULL))
+	if (stop_machine(check_and_unmap_cpu_on_node, pgdat, NULL))
 		return;
 
 	/*