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Q: Clarification about extra option ..Re: [Xen-devel] Re: [PATCH] pvops:

To: Shriram Rajagopalan <rshriram@xxxxxxxxx>, "Rafael J. Wysocki" <rjw@xxxxxxx>
Subject: Q: Clarification about extra option ..Re: [Xen-devel] Re: [PATCH] pvops: Make suspend work when CONFIG_SUSPEND=n
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Fri, 4 Mar 2011 13:26:02 -0500
Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, Frank Pan <frankpzh@xxxxxxxxx>, Jeremy Fitzhardinge <Jeremy.Fitzhardinge@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
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.. snip..
> >>  Someone suggested creating a new user visible hibernate symbol that would
> >> solve this issue and make the main hibernate logic depend on this symbol 
> >> rather
> >> than the HIBERNATE symbol. I could certainly spin up a patch for that but 
> >> nobody
> >> seemed to have reached a conclusion.
> >
> > Please do. I was under the understanding that we were waiting for a 
> > victi^H^H^Hvolunteer
> > to implement that.
> >
> > That was the only thing gatting your patchset going in.
> >
> >
> I certainly would have long time ago but for this comment in the thread
> "xen: fix XEN_SAVE_RESTORE Kconfig dependencies"
> Rafael:
>  I think we can introduce CONFIG_HIBERNATE_INTERFACE that will be user-visible
> option instead of CONFIG_HIBERNATION and will select the latter.  Then,
> CONFIG_XEN_SAVE_RESTORE will also be able to select CONFIG_HIBERNATION without
> building the hibernate interface in, which will prevent user space from being
> confused, but that will cause too much code to be built anyway.
> If by "too much code to be built", he meant the increase in kernel
> image size, then its not much of a deal :P.
> But if he meant, "too much code rework", then it is an issue.

The idea here is that the /sys/power/state won't be exposed with the "disk"

> But IMO, the CONFIG_HIBERNATE_INTERFACE needs to go in,
> only in the main hibernation initiator logic, as we still need the
> pieces of every driver anyway (their freeze/thaw routines).

Right. The idea here is to seperate the sysfs interface to be behind
another config option. So you can still enable the hibernate kernel code
but without exposing it to the userland.


That is the general idea, right?

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