Michael Bringmann [off-list ref] writes:

hotplug_init: Simplify the code needed for runtime memory hotplug and
maintenance with a conversion routine that transforms the compressed
property "ibm,dynamic-memory-v2" to the form of "ibm,dynamic-memory"
within the "ibm,dynamic-reconfiguration-memory" property.  Thus only
a single set of routines should be required at runtime to parse, edit,
and manipulate the memory representation in the device tree.  Similarly,
any userspace applications that need this information will only need
to recognize the older format to be able to continue to operate.

Signed-off-by: Michael Bringmann <redacted>

This is breaking the ppc64_defconfig build:

  arch/powerpc/platforms/built-in.o: In function `.__machine_initcall_pseries_pseries_memory_hotplug_init':
  hotplug-memory.c:(.init.text+0x8cdc): undefined reference to `.pseries_memory_block_size'


cheers