[PATCH 0/8] kexec build system updates, to allow cross-kexec()ing

[Vivek Goyal]

On Wed, Dec 19, 2007 at 06:38:22AM -0800, Lombard, David N wrote:
> On Tue, Dec 18, 2007 at 06:25:58PM -0500, Vivek Goyal wrote:
> > On Tue, Dec 18, 2007 at 05:47:55PM +0900, Jeremy Kerr wrote:
> > 
> > > This allows us to kexec a powerpc64 kernel from a powerpc userspace.
> > > x86{,_64} users might find this handy too, but I don't have hardware
> > > to test.
> > 
> > I think x86 it already happens. I think I can launch 64bit kernel from
> > a 32bit kexec.
> 
> You certainly can...
> 

If that's the case why should we build 64 bit purgatory for 32 bit kexec?
The only advantage I can think of is I can enter the new 64bit
kernel using 64bit entry point instead of 32bit entry point. Is that
the intention behind this work? Otherwise one should be able to launch
64bit kernel from a 32bit purgatory (Using 32bit entry point).

Thanks
Vivek