linux-kernel - [PATCH Bug fix 3/5] cpu-hotplug, memory-hotplug: try offline the node when hotremoving a cpu

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Date:	Tue, 22 Jan 2013 19:45:54 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	akpm@...ux-foundation.org, rjw@...k.pl, len.brown@...el.com,
	mingo@...hat.com, tglx@...utronix.de, minchan.kim@...il.com,
	rientjes@...gle.com, benh@...nel.crashing.org, paulus@...ba.org,
	cl@...ux.com, kosaki.motohiro@...fujitsu.com,
	isimatu.yasuaki@...fujitsu.com, wujianguo@...wei.com,
	wency@...fujitsu.com, hpa@...or.com, linfeng@...fujitsu.com,
	laijs@...fujitsu.com, mgorman@...e.de, yinghai@...nel.org,
	glommer@...allels.com, jiang.liu@...wei.com,
	julian.calaby@...il.com, sfr@...b.auug.org.au
Cc:	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-acpi@...r.kernel.org,
	Jiang Liu <liuj97@...il.com>, Mel Gorman <mel@....ul.ie>,
	Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH Bug fix 3/5] cpu-hotplug, memory-hotplug: try offline the node when hotremoving a cpu

From: Wen Congyang <wency@...fujitsu.com>

The node will be offlined when all memory/cpu on the node is hotremoved.
So we should try offline the node when hotremoving a cpu on the node.

Cc: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
Cc: David Rientjes <rientjes@...gle.com>
Cc: Jiang Liu <liuj97@...il.com>
Cc: Minchan Kim <minchan.kim@...il.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Mel Gorman <mel@....ul.ie>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Tang Chen <tangchen@...fujitsu.com>
Signed-off-by: Wen Congyang <wency@...fujitsu.com>
Signed-off-by: Tang Chen <tangchen@...fujitsu.com>
---
 drivers/acpi/processor_driver.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
index a24ee43..81745f1 100644
--- a/drivers/acpi/processor_driver.c
+++ b/drivers/acpi/processor_driver.c
@@ -45,6 +45,7 @@
 #include <linux/cpuidle.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
+#include <linux/memory_hotplug.h>
 
 #include <asm/io.h>
 #include <asm/cpu.h>
@@ -641,6 +642,7 @@ static int acpi_processor_remove(struct acpi_device *device, int type)
 
 	per_cpu(processors, pr->id) = NULL;
 	per_cpu(processor_device_array, pr->id) = NULL;
+	try_offline_node(cpu_to_node(pr->id));
 
 free:
 	free_cpumask_var(pr->throttling.shared_cpu_map);
-- 
1.7.1

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