linux-kernel - [PATCH] ACPI, cpu hotplug: move try_offline_node() after acpi_unmap

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Date:	Tue, 6 Aug 2013 19:11:11 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<rafael.j.wysocki@...el.com>, <toshi.kani@...com>
CC:	<linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] ACPI, cpu hotplug: move try_offline_node() after acpi_unmap_lsapic()

try_offline_node() checks that all cpus related with removed node have been
removed by using cpu_present_bits. If all cpus related with removed node have
been removed, try_offline_node() clears the node information.

But try_offline_node() called from acpi_processor_remove() never clears
the node information. For disabling cpu_present_bits, acpi_unmap_lsapic()
need be called. But acpi_unmap_lsapic() is called after try_offline_node()
runs. So when try_offline_node() runs, the cpu's cpu_present_bits is always
set.

This patch moves try_offline_node() after acpi_unmap_lsapic().

Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
---
 drivers/acpi/acpi_processor.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c
index fd6c51c..5a74a9c 100644
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -451,7 +451,6 @@ static void acpi_processor_remove(struct acpi_device *device)
 	/* Clean up. */
 	per_cpu(processor_device_array, pr->id) = NULL;
 	per_cpu(processors, pr->id) = NULL;
-	try_offline_node(cpu_to_node(pr->id));

 	/* Remove the CPU. */
 	get_online_cpus();
@@ -459,6 +458,8 @@ static void acpi_processor_remove(struct acpi_device *device)
 	acpi_unmap_lsapic(pr->id);
 	put_online_cpus();

+	try_offline_node(cpu_to_node(pr->id));
+
  out:
 	free_cpumask_var(pr->throttling.shared_cpu_map);
 	kfree(pr);

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