create sysfs link from acpi device to sysdev for cpu (9f1eb99c) · Commits · 戴 / test

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:

Zhang Rui <rui.zhang@intel.com> Signed-off-by:

Len Brown <len.brown@intel.com> Signed-off-by:

Andi Kleen <ak@linux.intel.com>

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) {

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