This is a note to let you know that I've just added the patch titled
ACPI / processor: do not mark present at boot but not onlined CPU as onlined
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
acpi-processor-do-not-mark-present-at-boot-but-not-onlined-cpu-as-onlined.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 0b9d46dd7debf8e6dc8614106f1c1909fa8de64d Mon Sep 17 00:00:00 2001
From: Igor Mammedov <imammedo@xxxxxxxxxx>
Date: Mon, 5 May 2014 22:49:49 +0200
Subject: ACPI / processor: do not mark present at boot but not onlined CPU as onlined
From: Igor Mammedov <imammedo@xxxxxxxxxx>
commit 0b9d46dd7debf8e6dc8614106f1c1909fa8de64d upstream.
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@xxxxxxxxxx>
Acked-by: Toshi Kani <toshi.kani@xxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/acpi/acpi_processor.c | 1 -
1 file changed, 1 deletion(-)
--- a/drivers/acpi/acpi_processor.c
+++ b/drivers/acpi/acpi_processor.c
@@ -405,7 +405,6 @@ static int acpi_processor_add(struct acp
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)
Patches currently in stable-queue which might be from imammedo@xxxxxxxxxx are
queue-3.14/acpi-processor-do-not-mark-present-at-boot-but-not-onlined-cpu-as-onlined.patch
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