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

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Date:	Thu, 29 Jan 2009 15:51:08 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@...e.cz>
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 Thursday 29 January 2009, Pavel Machek wrote:
> 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?

If I remember correctly, no, it won't.

Thanks,
Rafael
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