[PATCH 0/3] powerpc: support memoryless nodes

[Nishanth Aravamudan]

We have seen several issues recently on powerpc LPARs with memoryless
node NUMA configurations, e.g. (an extreme case):

numactl --hardware
available: 2 nodes (0,3)
node 0 cpus:
node 0 size: 0 MB
node 0 free: 0 MB
node 3 cpus: 0 1 2 3
node 3 size: 8142 MB
node 3 free: 7765 MB
node distances:
node   0   3 
  0:  10  20 
  3:  20  10 

powerpc doesn't set CONFIG_HAVE_MEMORYLESS_NODES, so we are missing out
on a lot of the core-kernel support necessary. This series attempts to
fix this by enabling the config option, which requires a few other
changes as well.

1/3: mm: return NUMA_NO_NODE in local_memory_node if zonelists are not
setup
2/3: powerpc: enable CONFIG_HAVE_PERCPU_NUMA_NODE_ID
3/3: powerpc: enable CONFIG_HAVE_MEMORYLESS_NODES

I have tested this series with Christoph's patch (currently being
discussed): http://www.spinics.net/lists/linux-mm/msg69452.html

Thanks,
Nish