Dave Hansen [off-list ref] wrote:

 There is some confusion with the SPARSEMEM patch between what
 is needed for DISCONTIG vs. NUMA.  For instance, the NODE_DATA()
 macro needs to be switched on NUMA, but not on FLATMEM.

 This patch is required if the previous patch is applied.

This patch breaks !CONFIG_NUMA ppc64:

include/linux/mmzone.h:387:1: warning: "NODE_DATA" redefined
include/asm/mmzone.h:55:1: warning: this is the location of the previous definition

I'll hack around it for now.
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