Hi Rafael and Greg, 3.10-stable tree does not neeed the patch. I thought that a bug related with the patch was introduced by commit cecdb19 "ACPI / scan: Change the implementation of acpi_bus_trim()". But it is wrong. The bug was introcuded by commit ac212b69 "ACPI / processor: Use common hotplug infrastructure" becase the commit moved try_offline_node() before acpi_unmap_lsapic(). And the commit is not merged into linux-3.10-stable tree. I apologize to you for giving a wrong information. Thanks, Yasuaki Ishimatsu (2013/08/12 13:08), gregkh@xxxxxxxxxxxxxxxxxxx wrote:
The patch below does not apply to the 3.10-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <stable@xxxxxxxxxxxxxxx>. thanks, greg k-h ------------------ original commit in Linus's tree ------------------ From 1e385f6f97b8ab39e16a0956a1951e19a9376bab Mon Sep 17 00:00:00 2001 From: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> Date: Tue, 6 Aug 2013 19:11:11 +0900 Subject: [PATCH] ACPI / processor: move try_offline_node() after acpi_unmap_lsapic() try_offline_node() checks that all CPUs associated with the given node have been removed by using cpu_present_bits. If all cpus related to that node have been removed, try_offline_node() clears the node information. However, try_offline_node() called from acpi_processor_remove() never clears the node information. For disabling cpu_present_bits, acpi_unmap_lsapic() needs be called. Yet, acpi_unmap_lsapic() is called after try_offline_node() has run. So when try_offline_node() runs, the CPU's cpu_present_bits is always set. Fix the issue by moving try_offline_node() after acpi_unmap_lsapic(). The problem fixed here was uncovered by commit cecdb19 "ACPI / scan: Change the implementation of acpi_bus_trim()". [rjw: Changelog] Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@xxxxxxxxxxxxxx> Acked-by: Toshi Kani <toshi.kani@xxxxxx> Cc: 3.9+ <stable@xxxxxxxxxxxxxxx> # 3.9+ Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> 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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