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

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Message-ID: <4FF65535.4060802@jp.fujitsu.com>
Date:	Fri, 6 Jul 2012 12:02:13 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	<lenb@...nel.org>, <linux-acpi@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ACPI: Add ACPI CPU hot-remove support

Hi Toshi,

2012/06/29 23:51, 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.
> 
> Signed-off-by: Toshi Kani <toshi.kani@...com>

Looks good to me.

Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

> 
> ---
> This patch applies on top of the patchset below.
> 
> [PATCH v6 0/6] ACPI: Add _OST support for ACPI hotplug
> http://marc.info/?l=linux-acpi&m=134074381322973&w=2
> 
> ---
>   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 f9fa1b2..a6f6bde 100644
> --- a/drivers/acpi/processor_driver.c
> +++ b/drivers/acpi/processor_driver.c
> @@ -699,8 +699,8 @@ 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;
>   
> @@ -732,20 +732,27 @@ 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,
> 



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