linux-kernel - Re: [PATCH 1/6] Hibernation: Introduce new system state for the last phase of hibernation

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Message-Id: <200810031705.11315.rjw@sisk.pl>
Date:	Fri, 3 Oct 2008 17:05:10 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Jeff Garzik <jeff@...zik.org>, Tejun Heo <htejun@...il.com>,
	ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
	linux-ide@...r.kernel.org, Thomas Renninger <trenn@...e.de>,
	Robert Hancock <hancockr@...w.ca>,
	LKML <linux-kernel@...r.kernel.org>,
	Frans Pop <elendil@...net.nl>,
	Maciej Rutecki <maciej.rutecki@...il.com>
Subject: Re: [PATCH 1/6] Hibernation: Introduce new system state for the last phase of hibernation

On Friday, 3 of October 2008, Arjan van de Ven wrote:
> On Fri, 3 Oct 2008 13:27:18 +0200
> "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> 
> > On Friday, 3 of October 2008, Andrew Morton wrote:
> > > On Tue, 30 Sep 2008 00:10:37 +0200 "Rafael J. Wysocki"
> > > <rjw@...k.pl> wrote:
> > > 
> > > > Hibernation: Introduce new system state for the last phase of
> > > > hibernation
> > > > 
> > > > Replace unused SYSTEM_SUSPEND_DISK with a new system_state value
> > > > SYSTEM_HIBERNATE_ENTER that can be used by device drivers to
> > > > check if the system is in the last phase of hibernation.
> > > 
> > > Violent objections.
> > > 
> > > We just don't know what this change will do.  It potentially affects
> > > every code site in the kernel which looks at system_state.
> > 
> > Do you mean anyone checking 'system_state != SOMETHING' ?  Oh well.
> 
> I think Andrew also means things looking for system_state > something
> like
> 
> arch/powerpc/platforms/cell/smp.c:      if (system_state < SYSTEM_RUNNING &&
> arch/powerpc/kernel/smp.c:      if (system_state < SYSTEM_RUNNING)
> arch/powerpc/kernel/smp.c:      if (system_state > SYSTEM_BOOTING)
> drivers/xen/xenbus/xenbus_probe.c:      if (system_state > SYSTEM_RUNNING) {

These particular ones shouldn't be affected AFAICS.

Anyway, I'm going to respin the patchset to take the Andrew's comment into
account.
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