From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Ian Campbell <Ian.Campbell@citrix.com>
Subject: Re: [Xen-devel] [PATCH] PM / Hibernate: Introduce CONFIG_HIBERNATE_INTERFACE
Date: Wed, 30 Mar 2011 23:10:24 +0200
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On Tuesday, March 29, 2011, Rafael J. Wysocki wrote:
> On Tuesday, March 29, 2011, Ian Campbell wrote:
> > Hi Rafael,
> > 
> > On Sat, 2011-03-26 at 11:29 +0000, Rafael J. Wysocki wrote:
> > > From: Rafael J. Wysocki <rjw@sisk.pl>
> > > 
> > > Xen save/restore is going to use hibernate device callbacks for
> > > quiescing devices and putting them back to normal operations and it
> > > would need to select CONFIG_HIBERNATION for this purpose.  However,
> > > that also would cause the hibernate interfaces for user space to be
> > > enabled, which might confuse user space, because the Xen kernels
> > > don't support hibernation.  Moreover, it would be wasteful, as it
> > > would make the Xen kernels include a substantial amount of code that
> > > they would never use.
> > > 
> > > To address this issue introduce new power management Kconfig option
> > > CONFIG_HIBERNATE_INTERFACE, such that the hibernate interfaces for
> > > user space and the image-handling code will depend on it and it will
> > > select CONFIG_HIBERNATION.  Then, Xen save/restore will be able to
> > > select CONFIG_HIBERNATION without dragging the entire hibernate code
> > > along with it.
> > > 
> > > Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
> > 
> > Were you planning to put this forward for 2.6.39 or are you waiting for
> > 2.6.40?
> 
> I'm goint to push it for 2.6.39.  In fact, I'm going to send the pull request
> shortly.

Unfortunately Linus didn't like it, so I need to rework it to make him happy.

As a result the patch is not going to go into 2.6.39.

Thanks,
Rafael
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