Re: [PATCH v2] ACPI: Add ACPI CPU hot-remove support

[Toshi Kani <toshi.kani@hp.com>]

Hi Len,

Can you please review this patch?  Please let me know if there is
anything I need to do for 3.7.

Thanks,
-Toshi


On Fri, 2012-08-24 at 14:54 -0600, Toshi Kani wrote:
> Added CPU hot-remove support through an ACPI eject notification.
> It calls acpi_bus_hot_remove_device(), which shares the same code
> path with the sysfs eject operation.  acpi_os_hotplug_execute()
> serializes hot-remove operations between ACPI hot-remove and sysfs
> eject requests.
> 
> v2:
>  - Rebased to 3.6-rc3.
> 
> Signed-off-by: Toshi Kani <toshi.kani@hp.com>
> Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
> Tested-by: IgorMammedov <imammedo@redhat.com>
> Tested-by: Vijay Mohan Pandarathil <vijaymohan.pandarathil@hp.com>
> Tested-by: Prarit Bhargava <prarit@redhat.com>
> ---
>  drivers/acpi/processor_driver.c |   27 +++++++++++++++++----------
>  1 files changed, 17 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/acpi/processor_driver.c b/drivers/acpi/processor_driver.c
> index bfc31cb..d12e9c3 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -694,8 +694,8 @@ int acpi_processor_device_add(acpi_handle handle, struct acpi_device **device)
>  static void acpi_processor_hotplug_notify(acpi_handle handle,
>  					  u32 event, void *data)
>  {
> -	struct acpi_processor *pr;
>  	struct acpi_device *device = NULL;
> +	struct acpi_eject_event *ej_event = NULL;
>  	u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; /* default */
>  	int result;
>  
> @@ -727,20 +727,27 @@ static void acpi_processor_hotplug_notify(acpi_handle handle,
>  				  "received ACPI_NOTIFY_EJECT_REQUEST\n"));
>  
>  		if (acpi_bus_get_device(handle, &device)) {
> -			printk(KERN_ERR PREFIX
> -				    "Device don't exist, dropping EJECT\n");
> +			pr_err(PREFIX "Device don't exist, dropping EJECT\n");
>  			break;
>  		}
> -		pr = acpi_driver_data(device);
> -		if (!pr) {
> -			printk(KERN_ERR PREFIX
> -				    "Driver data is NULL, dropping EJECT\n");
> +		if (!acpi_driver_data(device)) {
> +			pr_err(PREFIX "Driver data is NULL, dropping EJECT\n");
>  			break;
>  		}
>  
> -		/* REVISIT: update when eject is supported */
> -		ost_code = ACPI_OST_SC_EJECT_NOT_SUPPORTED;
> -		break;
> +		ej_event = kmalloc(sizeof(*ej_event), GFP_KERNEL);
> +		if (!ej_event) {
> +			pr_err(PREFIX "No memory, dropping EJECT\n");
> +			break;
> +		}
> +
> +		ej_event->handle = handle;
> +		ej_event->event = ACPI_NOTIFY_EJECT_REQUEST;
> +		acpi_os_hotplug_execute(acpi_bus_hot_remove_device,
> +					(void *)ej_event);
> +
> +		/* eject is performed asynchronously */
> +		return;
>  
>  	default:
>  		ACPI_DEBUG_PRINT((ACPI_DB_INFO,