[PATCH] x86: Find offset for crashkernel reservation automatically

Vivek Goyal vgoyal at redhat.com
Fri Jun 27 10:19:10 EDT 2008

On Fri, Jun 27, 2008 at 04:06:56PM +0200, Bernhard Walle wrote:
> * Vivek Goyal [2008-06-27 09:42]:
> > 
> > Thinking more about. Let me step back. I think it is not good idea to
> > take this kernel take decision about the capability of kernel being
> > loaded. There is no way we can find out now that if a kernel is capable
> > of running from this memory location or not. This is highly variable. So,
> > please ignore above comment.
> Maybe below 4G makes sense. Because you need some 32 bit memory for DMA.
> That's mostly an architecture limitation, so that could make sense to
> check here.

Even if you need some 32bit memory in the lower regions, kexec can handle
it with backup segment mechanism (currently 640K). We can always increse
the backup region size.

So I would think that it is best to leave it without any checking and 
then let kexec-tools handle it.


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