[PATCH 1/4][V2] powerpc : add support for linux, usable-memory properties for drconf memory

[Paul Mackerras]

Chandru writes:

> Scan for linux,usable-memory properties in case of dynamic reconfiguration 
> memory . Support for kexec/kdump.
> 
> Signed-off-by: Chandru Siddalingappa <chandru at in.ibm.com>

Could we *please* have a more comprehensive patch description that
that?  Something which will help people coming along in two (or five
or ten) years time to understand what problem exists in the code, how
this patch solves it, and why this approach was chosen over any
alternative approaches?

Thanks,
Paul.