numa_nearest_node
int numa_nearest_node(int node, unsigned int state);
#define numa_map_to_online_node(node) numa_nearest_node(node, N_ONLINE)
max_nid = numa_nearest_node(max_nid, N_CPU);
node = numa_nearest_node(node, N_CPU);
EXPORT_SYMBOL_GPL(numa_nearest_node);