#ifndef __LINUX_NODEMASK_H
  #define __LINUX_NODEMASK_H
  
  /*
   * Nodemasks provide a bitmap suitable for representing the
   * set of Node's in a system, one bit position per Node number.
   *
   * See detailed comments in the file linux/bitmap.h describing the
   * data type on which these nodemasks are based.
   *

   * For details of nodemask_scnprintf() and nodemask_parse_user(),
   * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.

   * For details of nodelist_scnprintf() and nodelist_parse(), see
   * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.

   * For details of node_remap(), see bitmap_bitremap in lib/bitmap.c.
   * For details of nodes_remap(), see bitmap_remap in lib/bitmap.c.

   * For details of nodes_onto(), see bitmap_onto in lib/bitmap.c.
   * For details of nodes_fold(), see bitmap_fold in lib/bitmap.c.

   *
   * The available nodemask operations are:
   *
   * void node_set(node, mask)		turn on bit 'node' in mask
   * void node_clear(node, mask)		turn off bit 'node' in mask
   * void nodes_setall(mask)		set all bits
   * void nodes_clear(mask)		clear all bits
   * int node_isset(node, mask)		true iff bit 'node' set in mask
   * int node_test_and_set(node, mask)	test and set bit 'node' in mask
   *
   * void nodes_and(dst, src1, src2)	dst = src1 & src2  [intersection]
   * void nodes_or(dst, src1, src2)	dst = src1 | src2  [union]
   * void nodes_xor(dst, src1, src2)	dst = src1 ^ src2
   * void nodes_andnot(dst, src1, src2)	dst = src1 & ~src2
   * void nodes_complement(dst, src)	dst = ~src
   *
   * int nodes_equal(mask1, mask2)	Does mask1 == mask2?
   * int nodes_intersects(mask1, mask2)	Do mask1 and mask2 intersect?
   * int nodes_subset(mask1, mask2)	Is mask1 a subset of mask2?
   * int nodes_empty(mask)		Is mask empty (no bits sets)?
   * int nodes_full(mask)			Is mask full (all bits sets)?
   * int nodes_weight(mask)		Hamming weight - number of set bits
   *
   * void nodes_shift_right(dst, src, n)	Shift right
   * void nodes_shift_left(dst, src, n)	Shift left
   *
   * int first_node(mask)			Number lowest set bit, or MAX_NUMNODES
   * int next_node(node, mask)		Next node past 'node', or MAX_NUMNODES
   * int first_unset_node(mask)		First node not set in mask, or 
   *					MAX_NUMNODES.
   *
   * nodemask_t nodemask_of_node(node)	Return nodemask with bit 'node' set
   * NODE_MASK_ALL			Initializer - all bits set
   * NODE_MASK_NONE			Initializer - no bits set
   * unsigned long *nodes_addr(mask)	Array of unsigned long's in mask
   *
   * int nodemask_scnprintf(buf, len, mask) Format nodemask for printing

   * int nodemask_parse_user(ubuf, ulen, mask)	Parse ascii string as nodemask

   * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
   * int nodelist_parse(buf, map)		Parse ascii string as nodelist

   * int node_remap(oldbit, old, new)	newbit = map(old, new)(oldbit)

   * void nodes_remap(dst, src, old, new)	*dst = map(old, new)(src)
   * void nodes_onto(dst, orig, relmap)	*dst = orig relative to relmap
   * void nodes_fold(dst, orig, sz)	dst bits = orig bits mod sz

   *
   * for_each_node_mask(node, mask)	for-loop node over mask
   *
   * int num_online_nodes()		Number of online Nodes
   * int num_possible_nodes()		Number of all possible Nodes
   *
   * int node_online(node)		Is some node online?
   * int node_possible(node)		Is some node possible?
   *

   * node_set_online(node)		set bit 'node' in node_online_map
   * node_set_offline(node)		clear bit 'node' in node_online_map
   *
   * for_each_node(node)			for-loop node over node_possible_map
   * for_each_online_node(node)		for-loop node over node_online_map
   *
   * Subtlety:
   * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
   *    to generate slightly worse code.  So use a simple one-line #define
   *    for node_isset(), instead of wrapping an inline inside a macro, the
   *    way we do the other calls.

   *
   * NODEMASK_SCRATCH
   * When doing above logical AND, OR, XOR, Remap operations the callers tend to
   * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large,
   * nodemask_t's consume too much stack space.  NODEMASK_SCRATCH is a helper
   * for such situations. See below and CPUMASK_ALLOC also.

   */
  
  #include <linux/kernel.h>
  #include <linux/threads.h>
  #include <linux/bitmap.h>
  #include <linux/numa.h>

  
  typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
  extern nodemask_t _unused_nodemask_arg_;
  
  #define node_set(node, dst) __node_set((node), &(dst))
  static inline void __node_set(int node, volatile nodemask_t *dstp)
  {
  	set_bit(node, dstp->bits);
  }
  
  #define node_clear(node, dst) __node_clear((node), &(dst))
  static inline void __node_clear(int node, volatile nodemask_t *dstp)
  {
  	clear_bit(node, dstp->bits);
  }
  
  #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
  static inline void __nodes_setall(nodemask_t *dstp, int nbits)
  {
  	bitmap_fill(dstp->bits, nbits);
  }
  
  #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
  static inline void __nodes_clear(nodemask_t *dstp, int nbits)
  {
  	bitmap_zero(dstp->bits, nbits);
  }
  
  /* No static inline type checking - see Subtlety (1) above. */
  #define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
  
  #define node_test_and_set(node, nodemask) \
  			__node_test_and_set((node), &(nodemask))
  static inline int __node_test_and_set(int node, nodemask_t *addr)
  {
  	return test_and_set_bit(node, addr->bits);
  }
  
  #define nodes_and(dst, src1, src2) \
  			__nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
  static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_or(dst, src1, src2) \
  			__nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
  static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_xor(dst, src1, src2) \
  			__nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
  static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_andnot(dst, src1, src2) \
  			__nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
  static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_complement(dst, src) \
  			__nodes_complement(&(dst), &(src), MAX_NUMNODES)
  static inline void __nodes_complement(nodemask_t *dstp,
  					const nodemask_t *srcp, int nbits)
  {
  	bitmap_complement(dstp->bits, srcp->bits, nbits);
  }
  
  #define nodes_equal(src1, src2) \
  			__nodes_equal(&(src1), &(src2), MAX_NUMNODES)
  static inline int __nodes_equal(const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	return bitmap_equal(src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_intersects(src1, src2) \
  			__nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
  static inline int __nodes_intersects(const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	return bitmap_intersects(src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_subset(src1, src2) \
  			__nodes_subset(&(src1), &(src2), MAX_NUMNODES)
  static inline int __nodes_subset(const nodemask_t *src1p,
  					const nodemask_t *src2p, int nbits)
  {
  	return bitmap_subset(src1p->bits, src2p->bits, nbits);
  }
  
  #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
  static inline int __nodes_empty(const nodemask_t *srcp, int nbits)
  {
  	return bitmap_empty(srcp->bits, nbits);
  }
  
  #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
  static inline int __nodes_full(const nodemask_t *srcp, int nbits)
  {
  	return bitmap_full(srcp->bits, nbits);
  }
  
  #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
  static inline int __nodes_weight(const nodemask_t *srcp, int nbits)
  {
  	return bitmap_weight(srcp->bits, nbits);
  }
  
  #define nodes_shift_right(dst, src, n) \
  			__nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
  static inline void __nodes_shift_right(nodemask_t *dstp,
  					const nodemask_t *srcp, int n, int nbits)
  {
  	bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
  }
  
  #define nodes_shift_left(dst, src, n) \
  			__nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
  static inline void __nodes_shift_left(nodemask_t *dstp,
  					const nodemask_t *srcp, int n, int nbits)
  {
  	bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
  }
  
  /* FIXME: better would be to fix all architectures to never return
            > MAX_NUMNODES, then the silly min_ts could be dropped. */
  
  #define first_node(src) __first_node(&(src))
  static inline int __first_node(const nodemask_t *srcp)
  {
  	return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
  }
  
  #define next_node(n, src) __next_node((n), &(src))
  static inline int __next_node(int n, const nodemask_t *srcp)
  {
  	return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
  }

  static inline void init_nodemask_of_node(nodemask_t *mask, int node)
  {
  	nodes_clear(*mask);
  	node_set(node, *mask);
  }

  #define nodemask_of_node(node)						\
  ({									\
  	typeof(_unused_nodemask_arg_) m;				\
  	if (sizeof(m) == sizeof(unsigned long)) {			\

  		m.bits[0] = 1UL << (node);				\

  	} else {							\

  		init_nodemask_of_node(&m, (node));			\

  	}								\
  	m;								\
  })
  
  #define first_unset_node(mask) __first_unset_node(&(mask))
  static inline int __first_unset_node(const nodemask_t *maskp)
  {
  	return min_t(int,MAX_NUMNODES,
  			find_first_zero_bit(maskp->bits, MAX_NUMNODES));
  }
  
  #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
  
  #if MAX_NUMNODES <= BITS_PER_LONG
  
  #define NODE_MASK_ALL							\
  ((nodemask_t) { {							\
  	[BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD		\
  } })
  
  #else
  
  #define NODE_MASK_ALL							\
  ((nodemask_t) { {							\
  	[0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL,			\
  	[BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD		\
  } })
  
  #endif
  
  #define NODE_MASK_NONE							\
  ((nodemask_t) { {							\
  	[0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] =  0UL			\
  } })
  
  #define nodes_addr(src) ((src).bits)
  
  #define nodemask_scnprintf(buf, len, src) \
  			__nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES)
  static inline int __nodemask_scnprintf(char *buf, int len,
  					const nodemask_t *srcp, int nbits)
  {
  	return bitmap_scnprintf(buf, len, srcp->bits, nbits);
  }

  #define nodemask_parse_user(ubuf, ulen, dst) \
  		__nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
  static inline int __nodemask_parse_user(const char __user *buf, int len,

  					nodemask_t *dstp, int nbits)
  {

  	return bitmap_parse_user(buf, len, dstp->bits, nbits);

  }
  
  #define nodelist_scnprintf(buf, len, src) \
  			__nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES)
  static inline int __nodelist_scnprintf(char *buf, int len,
  					const nodemask_t *srcp, int nbits)
  {
  	return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
  }
  
  #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
  static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
  {
  	return bitmap_parselist(buf, dstp->bits, nbits);
  }

  #define node_remap(oldbit, old, new) \
  		__node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
  static inline int __node_remap(int oldbit,
  		const nodemask_t *oldp, const nodemask_t *newp, int nbits)
  {
  	return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
  }
  
  #define nodes_remap(dst, src, old, new) \
  		__nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
  static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
  		const nodemask_t *oldp, const nodemask_t *newp, int nbits)
  {
  	bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
  }

  #define nodes_onto(dst, orig, relmap) \
  		__nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
  static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp,
  		const nodemask_t *relmapp, int nbits)
  {
  	bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
  }
  
  #define nodes_fold(dst, orig, sz) \
  		__nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
  static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
  		int sz, int nbits)
  {
  	bitmap_fold(dstp->bits, origp->bits, sz, nbits);
  }

  #if MAX_NUMNODES > 1
  #define for_each_node_mask(node, mask)			\
  	for ((node) = first_node(mask);			\
  		(node) < MAX_NUMNODES;			\
  		(node) = next_node((node), (mask)))
  #else /* MAX_NUMNODES == 1 */
  #define for_each_node_mask(node, mask)			\
  	if (!nodes_empty(mask))				\
  		for ((node) = 0; (node) < 1; (node)++)
  #endif /* MAX_NUMNODES */
  
  /*

   * Bitmasks that are kept for all the nodes.
   */
  enum node_states {

  	N_POSSIBLE,		/* The node could become online at some point */
  	N_ONLINE,		/* The node is online */
  	N_NORMAL_MEMORY,	/* The node has regular memory */
  #ifdef CONFIG_HIGHMEM
  	N_HIGH_MEMORY,		/* The node has regular or high memory */
  #else
  	N_HIGH_MEMORY = N_NORMAL_MEMORY,
  #endif

  	N_CPU,		/* The node has one or more cpus */

  	NR_NODE_STATES
  };
  
  /*

   * The following particular system nodemasks and operations
   * on them manage all possible and online nodes.
   */

  extern nodemask_t node_states[NR_NODE_STATES];

  
  #if MAX_NUMNODES > 1

  static inline int node_state(int node, enum node_states state)
  {
  	return node_isset(node, node_states[state]);
  }
  
  static inline void node_set_state(int node, enum node_states state)
  {
  	__node_set(node, &node_states[state]);
  }
  
  static inline void node_clear_state(int node, enum node_states state)
  {
  	__node_clear(node, &node_states[state]);
  }
  
  static inline int num_node_state(enum node_states state)
  {
  	return nodes_weight(node_states[state]);
  }
  
  #define for_each_node_state(__node, __state) \
  	for_each_node_mask((__node), node_states[__state])
  
  #define first_online_node	first_node(node_states[N_ONLINE])
  #define next_online_node(nid)	next_node((nid), node_states[N_ONLINE])

  extern int nr_node_ids;

  extern int nr_online_nodes;
  
  static inline void node_set_online(int nid)
  {
  	node_set_state(nid, N_ONLINE);
  	nr_online_nodes = num_node_state(N_ONLINE);
  }
  
  static inline void node_set_offline(int nid)
  {
  	node_clear_state(nid, N_ONLINE);
  	nr_online_nodes = num_node_state(N_ONLINE);
  }

  #else

  
  static inline int node_state(int node, enum node_states state)
  {
  	return node == 0;
  }
  
  static inline void node_set_state(int node, enum node_states state)
  {
  }
  
  static inline void node_clear_state(int node, enum node_states state)
  {
  }
  
  static inline int num_node_state(enum node_states state)
  {
  	return 1;
  }
  
  #define for_each_node_state(node, __state) \
  	for ( (node) = 0; (node) == 0; (node) = 1)

  #define first_online_node	0
  #define next_online_node(nid)	(MAX_NUMNODES)

  #define nr_node_ids		1

  #define nr_online_nodes		1

  #define node_set_online(node)	   node_set_state((node), N_ONLINE)
  #define node_set_offline(node)	   node_clear_state((node), N_ONLINE)

  #endif

  #define node_online_map 	node_states[N_ONLINE]
  #define node_possible_map 	node_states[N_POSSIBLE]

  #define num_online_nodes()	num_node_state(N_ONLINE)
  #define num_possible_nodes()	num_node_state(N_POSSIBLE)
  #define node_online(node)	node_state((node), N_ONLINE)
  #define node_possible(node)	node_state((node), N_POSSIBLE)

  #define for_each_node(node)	   for_each_node_state(node, N_POSSIBLE)
  #define for_each_online_node(node) for_each_node_state(node, N_ONLINE)

  /*

   * For nodemask scrach area.
   * NODEMASK_ALLOC(type, name) allocates an object with a specified type and
   * name.

   */

  #if NODES_SHIFT > 8 /* nodemask_t > 256 bytes */
  #define NODEMASK_ALLOC(type, name, gfp_flags)	\
  			type *name = kmalloc(sizeof(*name), gfp_flags)
  #define NODEMASK_FREE(m)			kfree(m)

  #else

  #define NODEMASK_ALLOC(type, name, gfp_flags)	type _##name, *name = &_##name

  #define NODEMASK_FREE(m)			do {} while (0)

  #endif
  
  /* A example struture for using NODEMASK_ALLOC, used in mempolicy. */
  struct nodemask_scratch {
  	nodemask_t	mask1;
  	nodemask_t	mask2;
  };

  #define NODEMASK_SCRATCH(x)						\
  			NODEMASK_ALLOC(struct nodemask_scratch, x,	\
  					GFP_KERNEL | __GFP_NORETRY)

  #define NODEMASK_SCRATCH_FREE(x)	NODEMASK_FREE(x)

  #endif /* __LINUX_NODEMASK_H */