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Red Hat Bugzilla – Attachment 938465 Details for
Bug 968147
enable online multiple hot-added CPUs cause RHEL7.0 guest hang(soft lockup)
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[patch]
[RHEL7.1 PATCH 1/4] ACPI / processor: do not mark present at boot but not onlined CPU as onlined
0001-ACPI-processor-do-not-mark-present-at-boot-but-not-o.patch (text/plain), 1.72 KB, created by
Igor Mammedov
on 2014-09-17 12:55:15 UTC
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Description:
[RHEL7.1 PATCH 1/4] ACPI / processor: do not mark present at boot but not onlined CPU as onlined
Filename:
MIME Type:
Creator:
Igor Mammedov
Created:
2014-09-17 12:55:15 UTC
Size:
1.72 KB
patch
obsolete
>From b7e75024ac09e0c71761feedc93841e8c44f717b Mon Sep 17 00:00:00 2001 >From: Igor Mammedov <imammedo@redhat.com> >Date: Mon, 5 May 2014 22:49:49 +0200 >Subject: [RHEL7.1 PATCH 1/4] ACPI / processor: do not mark present at boot but not > onlined CPU as onlined > >BZ: https://bugzilla.redhat.com/show_bug.cgi?id=968147 >Brew: http://brewweb.devel.redhat.com/brew/taskinfo?taskID=7981610 >Upstream: 0b9d46dd7debf8e6dc8614106f1c1909fa8de64d > >acpi_processor_add() assumes that present at boot CPUs >are always onlined, it is not so if a CPU failed to become >onlined. As result acpi_processor_add() will mark such CPU >device as onlined in sysfs and following attempts to >online/offline it using /sys/device/system/cpu/cpuX/online >attribute will fail. > >Do not poke into device internals in acpi_processor_add() >and touch "struct device { .offline }" attribute, since >for CPUs onlined at boot it's set by: > topology_init() -> arch_register_cpu() -> register_cpu() >before ACPI device tree is parsed, and for hotplugged >CPUs it's set when userspace onlines CPU via sysfs. > >Signed-off-by: Igor Mammedov <imammedo@redhat.com> >Acked-by: Toshi Kani <toshi.kani@hp.com> >Cc: 3.11+ <stable@vger.kernel.org> # 3.11+ >Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> >--- > drivers/acpi/acpi_processor.c | 1 - > 1 file changed, 1 deletion(-) > >diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c >index 5e013c9..7c5c312 100644 >--- a/drivers/acpi/acpi_processor.c >+++ b/drivers/acpi/acpi_processor.c >@@ -405,7 +405,6 @@ static int acpi_processor_add(struct acpi_device *device, > goto err; > > pr->dev = dev; >- dev->offline = pr->flags.need_hotplug_init; > > /* Trigger the processor driver's .probe() if present. */ > if (device_attach(dev) >= 0) >-- >1.8.3.1 >
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bug 968147
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754159
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870935
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936529
| 938465 |
938466
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938468
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938469