arm64 crashkernel fails to boot on acpi-only machines due to ACPI regions being no longer mapped as NOMAP

[AKASHI Takahiro]

Hi,

On Fri, Nov 10, 2017 at 05:41:56PM +0530, Bhupesh Sharma wrote:
> Resent with Akashi's correct email address.
> 
> On Fri, Nov 10, 2017 at 5:39 PM, Bhupesh Sharma <bhsharma at redhat.com> wrote:
> > Hi Ard, Akashi
> >
> > I have met an issue on an arm64 board using the latest master branch from Linus.
  (snip)
> >
> > 8. Also, I think now the crashkernel handling changed by
> > e7cd190385d17790cc3eb3821b1094b00aacf325 (arm64: mark reserved
> > memblock regions explicitly in iomem), needs to be changed to handle
> > the change added by Ard to fix this issue on ACPI only machines.
> >
> > I have a dirty hack in place, but I would like to have your opinions
> > about what can be a more concrete fix to this issue (as we mark these
> > regions as System RAM now rather than NOMAP) and I don't have a DTB
> > based machine to test on currently.

I don't know much about acpi reclaim regions,
can you please tell me how your change affects your panic case?

Thanks,
-Takahiro AKASHI


> > Please share your views.
> >
> > Regards,
> > Bhupesh