nodemask: numa: reorganize inclusion path

Nodemasks now pull linux/numa.h for MAX_NUMNODES and NUMA_NO_NODE
macros. This series makes numa.h depending on nodemasks, so we hit
a circular dependency.

Nodemasks library is highly employed by NUMA code, and it would be
logical to resolve the circular dependency by making NUMA headers
dependent nodemask.h.

Signed-off-by: Yury Norov [NVIDIA] <[e-mail]>
Signed-off-by: Andrea Righi <[e-mail]>
Signed-off-by: Tejun Heo <[e-mail]>

include/linux/nodemask.h

···
 #include <linux/bitmap.h>
 #include <linux/minmax.h>
 #include <linux/nodemask_types.h>
-#include <linux/numa.h>
 #include <linux/random.h>
 
 extern nodemask_t _unused_nodemask_arg_;

include/linux/nodemask_types.h

···
 #define __LINUX_NODEMASK_TYPES_H
 
 #include <linux/bitops.h>
-#include <linux/numa.h>
+
+#ifdef CONFIG_NODES_SHIFT
+#define NODES_SHIFT     CONFIG_NODES_SHIFT
+#else
+#define NODES_SHIFT     0
+#endif
+
+#define MAX_NUMNODES    (1 << NODES_SHIFT)
+
+#define	NUMA_NO_NODE	(-1)
 
 typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
 

include/linux/numa.h

···
 #define _LINUX_NUMA_H
 #include <linux/init.h>
 #include <linux/types.h>
+#include <linux/nodemask.h>
 
-#ifdef CONFIG_NODES_SHIFT
-#define NODES_SHIFT     CONFIG_NODES_SHIFT
-#else
-#define NODES_SHIFT     0
-#endif
-
-#define MAX_NUMNODES    (1 << NODES_SHIFT)
-
-#define	NUMA_NO_NODE	(-1)
 #define	NUMA_NO_MEMBLK	(-1)
 
 static inline bool numa_valid_node(int nid)