Re: [Xen-devel] Re: [PATCH] xen: fix XEN_SAVE_RESTORE Kconfig dependencies

[Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>]

On Wed, 2011-02-23 at 10:58 +0000, Jan Beulich wrote:
> >>> On 23.02.11 at 10:08, Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx> wrote:
> > On Wed, 2011-02-23 at 07:27 +0000, Shriram Rajagopalan wrote:
> >> Make XEN_SAVE_RESTORE user visible and enable HIBERNATION and SWAP,
> >> if this option is enabled.
> > 
> > I was under the (perhaps mistaken?) impression that selecting user
> > visible Kconfig symbols was verboten since it has side-effects which
> > make it hard for users to figure out why something cannot be switched
> > off and/or how to turn things on etc.
> > 
> > In any case I think I preferred the "depends HIBERNATION" idea -- I
> > thought that was the consensus of the thread too?
> 
> Why HIBERNATION (and SWAP) instead of SUSPEND? Xen doesn't
> support the former (other than the latter)...

HIBERNATION provides the FREEZE, THAW and RESUME methods which we would
like to use to integrate save/restore/checkpoint with the PM core i.e.
choose THAW vs. RESUME based on whether the suspend was cancelled (aka a
checkpoint) or not. See Shriram's other recent patch for details.

Ian.


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