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Commit 9f1eb99c authored by Zhang Rui's avatar Zhang Rui Committed by Andi Kleen
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create sysfs link from acpi device to sysdev for cpu 

Sys I/F under acpi device node and sysdev device node are both
needed for cpu hot-removal. User space need this link so that
they know they are poking the sys I/F for the same cpu.
http://bugzilla.kernel.org/show_bug.cgi?id=9772



Signed-off-by: default avatarZhang Rui <rui.zhang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
parent b62b8ef9

drivers/acpi/processor_core.c

+7 −1
Original line number Diff line number Diff line
@@ -621,7 +621,7 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device) 
	int result = 0;

	acpi_status status = AE_OK;

	struct acpi_processor *pr;



	struct sys_device *sysdev;



	pr = acpi_driver_data(device);
@@ -652,6 +652,10 @@ static int __cpuinit acpi_processor_start(struct acpi_device *device) 
	if (result)

		goto end;



	sysdev = get_cpu_sysdev(pr->id);

	if (sysfs_create_link(&device->dev.kobj, &sysdev->kobj, "sysdev"))

		return -EFAULT;



	status = acpi_install_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,

					     acpi_processor_notify, pr);
@@ -810,6 +814,8 @@ static int acpi_processor_remove(struct acpi_device *device, int type) 
	status = acpi_remove_notify_handler(pr->handle, ACPI_DEVICE_NOTIFY,

					    acpi_processor_notify);



	sysfs_remove_link(&device->dev.kobj, "sysdev");



	acpi_processor_remove_fs(device);



	if (pr->cdev) {