Hi,

The crashkernel region is specified via kernel cmdline, so why
not just drop a failure when it overlaps with RMO region?
Am I missing something?

Unfortunately a ppc64 kernel requires a chunk of RMO memory. We would
need the ability to specify multiple crashkernel regions - about 32MB
in the RMO and the rest can be anywhere. That sounds pretty fragile for
a user to configure successfully on the cmdline.

Thats why the ppc64 crashkernel region begins mid way through the RMO
region. It means both kernels get a chunk of RMO and we only have to
deal with one crashkernel reservation in all the tools and
documentation.

Anton