linux-kernel - Re: [RFC PATCH v2 02/12] ACPI: Add sys_hotplug.h for system device hotplug framework

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Date:	Fri, 11 Jan 2013 22:25:18 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Toshi Kani <toshi.kani@...com>
Cc:	lenb@...nel.org, gregkh@...uxfoundation.org,
	akpm@...ux-foundation.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	linuxppc-dev@...ts.ozlabs.org, linux-s390@...r.kernel.org,
	bhelgaas@...gle.com, isimatu.yasuaki@...fujitsu.com,
	jiang.liu@...wei.com, wency@...fujitsu.com, guohanjun@...wei.com,
	yinghai@...nel.org, srivatsa.bhat@...ux.vnet.ibm.com
Subject: Re: [RFC PATCH v2 02/12] ACPI: Add sys_hotplug.h for system device hotplug framework

On Thursday, January 10, 2013 04:40:20 PM Toshi Kani wrote:
> Added include/acpi/sys_hotplug.h, which is ACPI-specific system
> device hotplug header and defines the order values of ACPI-specific
> handlers.
> 
> Signed-off-by: Toshi Kani <toshi.kani@...com>
> ---
>  include/acpi/sys_hotplug.h |   48 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 48 insertions(+)
>  create mode 100644 include/acpi/sys_hotplug.h
> 
> diff --git a/include/acpi/sys_hotplug.h b/include/acpi/sys_hotplug.h
> new file mode 100644
> index 0000000..ad80f61
> --- /dev/null
> +++ b/include/acpi/sys_hotplug.h
> @@ -0,0 +1,48 @@
> +/*
> + * sys_hotplug.h - ACPI System device hot-plug framework
> + *
> + * Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
> + *	Toshi Kani <toshi.kani@...com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#ifndef _ACPI_SYS_HOTPLUG_H
> +#define _ACPI_SYS_HOTPLUG_H
> +
> +#include <linux/list.h>
> +#include <linux/device.h>
> +#include <linux/sys_hotplug.h>
> +
> +/*
> + * System device hot-plug operation proceeds in the following order.
> + *   Validate phase -> Execute phase -> Commit phase
> + *
> + * The order values below define the calling sequence of ACPI-specific
> + * handlers for each phase in ascending order.  The order value of
> + * platform-neutral handlers are defined in <linux/sys_hotplug.h>.
> + */
> +
> +/* Add Validate order values */
> +#define SHP_ACPI_BUS_ADD_VALIDATE_ORDER		0	/* must be first */
> +
> +/* Add Execute order values */
> +#define SHP_ACPI_BUS_ADD_EXECUTE_ORDER		10
> +#define SHP_ACPI_RES_ADD_EXECUTE_ORDER		20
> +
> +/* Add Commit order values */
> +#define SHP_ACPI_BUS_ADD_COMMIT_ORDER		10
> +
> +/* Delete Validate order values */
> +#define SHP_ACPI_BUS_DEL_VALIDATE_ORDER		0	/* must be first */
> +#define SHP_ACPI_RES_DEL_VALIDATE_ORDER		10
> +
> +/* Delete Execute order values */
> +#define SHP_ACPI_BUS_DEL_EXECUTE_ORDER		100
> +
> +/* Delete Commit order values */
> +#define SHP_ACPI_BUS_DEL_COMMIT_ORDER		100
> +
> +#endif	/* _ACPI_SYS_HOTPLUG_H */
> --

Why did you use the particular values above?

Rafael


-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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