hugetlb: add generic definition of NUMA_NO_NODE

Move definition of NUMA_NO_NODE from ia64 and x86_64 arch specific headers
to generic header 'linux/numa.h' for use in generic code. NUMA_NO_NODE
replaces bare '-1' where it's used in this series to indicate "no node id
specified". Ultimately, it can be used to replace the -1 elsewhere where
it is used similarly.

Signed-off-by: Lee Schermerhorn <[e-mail]>
Acked-by: David Rientjes <[e-mail]>
Acked-by: Mel Gorman <[e-mail]>
Reviewed-by: Andi Kleen <[e-mail]>
Cc: KAMEZAWA Hiroyuki <[e-mail]>
Cc: Randy Dunlap <[e-mail]>
Cc: Nishanth Aravamudan <[e-mail]>
Cc: Adam Litke <[e-mail]>
Cc: Andy Whitcroft <[e-mail]>
Cc: Eric Whitney <[e-mail]>
Cc: Christoph Lameter <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

arch/ia64/include/asm/numa.h

···
 
 #include <asm/mmzone.h>
 
-#define NUMA_NO_NODE	-1
-
 extern u16 cpu_to_node_map[NR_CPUS] __cacheline_aligned;
 extern cpumask_t node_to_cpu_mask[MAX_NUMNODES] __cacheline_aligned;
 extern pg_data_t *pgdat_list[MAX_NUMNODES];

arch/x86/include/asm/topology.h

···
 # endif
 #endif
 
-/* Node not present */
-#define NUMA_NO_NODE	(-1)
+/*
+ * to preserve the visibility of NUMA_NO_NODE definition,
+ * moved to there from here.  May be used independent of
+ * CONFIG_NUMA.
+ */
+#include <linux/numa.h>
 
 #ifdef CONFIG_NUMA
 #include <linux/cpumask.h>
+
 #include <asm/mpspec.h>
 
 #ifdef CONFIG_X86_32

include/linux/numa.h

···
 
 #define MAX_NUMNODES    (1 << NODES_SHIFT)
 
+#define	NUMA_NO_NODE	(-1)
+
 #endif /* _LINUX_NUMA_H */