linux-kernel - Re: [PATCH 1/6] Hibernation: Introduce system_entering

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Message-ID: <20090129130435.GB1425@ucw.cz>
Date:	Thu, 29 Jan 2009 14:04:35 +0100
From:	Pavel Machek <pavel@...e.cz>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Jeff Garzik <jeff@...zik.org>, Frans Pop <elendil@...net.nl>,
	tj@...nel.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6] Hibernation: Introduce system_entering_hibernation

On Mon 2009-01-19 20:54:54, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rjw@...k.pl>
> 
> Introduce boolean function system_entering_hibernation() returning
> 'true' during the last phase of hibernation, in which devices are
> being put into low power states and the sleep state (for example,
> ACPI S4) is finally entered.

...this paragraph...

> Index: linux-2.6/kernel/power/disk.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/disk.c
> +++ linux-2.6/kernel/power/disk.c
> @@ -71,6 +71,14 @@ void hibernation_set_ops(struct platform
>  	mutex_unlock(&pm_mutex);
>  }

....should go somewhere here. Because the name does not imply it is
for last phases, only...

> +static bool entering_platform_hibernation;
> +
> +bool system_entering_hibernation(void)
> +{
> +	return entering_platform_hibernation;
> +}
> +EXPORT_SYMBOL(system_entering_hibernation);
> +
>  #ifdef CONFIG_PM_DEBUG
>  static void hibernation_debug_sleep(void)
>  {
> @@ -411,6 +419,7 @@ int hibernation_platform_enter(void)
>  	if (error)
>  		goto Close;
>  
> +	entering_platform_hibernation = true;
>  	suspend_console();

Why entering _platform_ hibernation? It will not be set for echo
shutdown > disk case?

									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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