From: <j-nomura@ce.jp.nec.com>

The attached patch is NUMA-aware zonelist builder patch, which sorts
zonelist in the order that near-node first, far-node last.  In lse-tech and
linux-ia64, where most of NUMA people resides, no objections are raised so
far.

The patch adds NUMA-specific version of build_zonelists which calls
find_next_best_node to select the next-nearest node to add to zonelist.

The patch has no effect on flat NUMA platform.