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Re: [Xen-devel] [PATCH] PM / Hibernate: Introduce CONFIG_HIBERNATE_INTER

To: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] PM / Hibernate: Introduce CONFIG_HIBERNATE_INTERFACE
From: "Rafael J. Wysocki" <rjw@xxxxxxx>
Date: Tue, 29 Mar 2011 21:39:35 +0200
Cc: Shriram Rajagopalan <rshriram@xxxxxxxxx>, "linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx" <linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>
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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@xxxxxxx>
> > 
> > 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@xxxxxxx>
> 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


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