linux-kernel - Re: System slow down from udev

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Date:	Thu, 30 May 2013 18:36:58 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Toshi Kani <toshi.kani@...com>
Subject: Re: System slow down from udev

On Thursday, May 30, 2013 04:45:35 PM Rafael J. Wysocki wrote:
> On Thursday, May 30, 2013 04:34:51 PM Rafael J. Wysocki wrote:
[...]
> > 
> > I'll try to dig deeper locally in the meantime.
> 
> Actually, I think I know what the problem is, but I need some more time to
> debug it.  Fortunately, I'm able to see some symptoms. :-)

OK, one fix is appended, but there still is one more bug I need to investigate.

Please check if this one helps, though.

Thanks,
Rafael


---
 drivers/acpi/acpi_processor.c   |    5 +++++
 drivers/acpi/processor_driver.c |    3 ---
 2 files changed, 5 insertions(+), 3 deletions(-)

Index: linux-pm/drivers/acpi/processor_driver.c
===================================================================
--- linux-pm.orig/drivers/acpi/processor_driver.c
+++ linux-pm/drivers/acpi/processor_driver.c
@@ -78,9 +78,6 @@ static struct device_driver acpi_process
 	.remove = acpi_processor_stop,
 };
 
-DEFINE_PER_CPU(struct acpi_processor *, processors);
-EXPORT_PER_CPU_SYMBOL(processors);
-
 static void acpi_processor_notify(acpi_handle handle, u32 event, void *data)
 {
 	struct acpi_device *device = data;
Index: linux-pm/drivers/acpi/acpi_processor.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpi_processor.c
+++ linux-pm/drivers/acpi/acpi_processor.c
@@ -29,6 +29,9 @@
 
 ACPI_MODULE_NAME("processor");
 
+DEFINE_PER_CPU(struct acpi_processor *, processors);
+EXPORT_PER_CPU_SYMBOL(processors);
+
 /* --------------------------------------------------------------------------
                                 Errata Handling
    -------------------------------------------------------------------------- */
@@ -387,6 +390,7 @@ static int __cpuinit acpi_processor_add(
 	 * checks.
 	 */
 	per_cpu(processor_device_array, pr->id) = device;
+	per_cpu(processors, pr->id) = pr;
 
 	dev = get_cpu_device(pr->id);
 	result = acpi_bind_one(dev, pr->handle);
@@ -406,6 +410,7 @@ static int __cpuinit acpi_processor_add(
  err:
 	free_cpumask_var(pr->throttling.shared_cpu_map);
 	device->driver_data = NULL;
+	per_cpu(processors, pr->id) = NULL;
  err_free_pr:
 	kfree(pr);
 	return result;

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