[PATCH] x86: Find offset for crashkernel reservation automatically

Bernhard Walle bwalle at suse.de
Fri Jun 27 10:22:23 EDT 2008

* Vivek Goyal [2008-06-27 10:19]:
> 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.

Ah, that's true. Only on x86, right? (That would be an alternative for
ia64, too ...)

But in general policy should go in userspace (if possible), so I agree
with you that kexec-tools can handle that.

Bernhard Walle, SUSE LINUX Products GmbH, Architecture Development

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