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

Author: Lee Schermerhorn

arch/ia64/include/asm/numa.h

@@ -22,8 +22,6 @@
 
 #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

@@ -35,11 +35,16 @@
 # 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

@@ -10,4 +10,6 @@
 
 #define MAX_NUMNODES    (1 << NODES_SHIFT)
 
+#define	NUMA_NO_NODE	(-1)
+
 #endif /* _LINUX_NUMA_H */