[linux-pm] Re: [RFC][PATCH 1/2 -mm] kexec based hibernation -v3: kexec jump

[Rafael J. Wysocki]

On Friday, 21 September 2007 23:08, Jeremy Maitin-Shepard wrote:
> "Rafael J. Wysocki" <rjw at sisk.pl> writes:
> 
> > On Friday, 21 September 2007 22:26, Jeremy Maitin-Shepard wrote:
> >> "Rafael J. Wysocki" <rjw at sisk.pl> writes:
> >> 
> >> [snip]
> >> 
> >> > The ACPI NVS area is explicitly marked as reserved and we don't save it.
> >> > On x86_64 we don't save any memory areas marked as reserved and yet the
> > above
> >> > happens.
> >> 
> >> I think you have mentioned before, though, that ACPI is first
> >> initialized by the boot kernel, before it is later initialized by
> >> resuming kernel.  This could well be the source of the problem.
> 
> > No, it's not.  I have tested that too with an ACPI-less boot kernel.
> 
> Well, it seems that there just must be some other bug.  I would define
> anything that differs between the post-resume initialization of ACPI

I'm not sure what you mean.

> from the normal boot initialization of ACPI as a bug.  If the interaction
> with the hardware is the same, then the behavior will be the same.

The ACPI platform firmware is allowed to preserve information accross the
hibernation-resume cycle, so this need not be the same.

Greetings,
Rafael