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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_NODEMASK_H
2#define __LINUX_NODEMASK_H
3
4/*
5 * Nodemasks provide a bitmap suitable for representing the
6 * set of Node's in a system, one bit position per Node number.
7 *
8 * See detailed comments in the file linux/bitmap.h describing the
9 * data type on which these nodemasks are based.
10 *
Reinette Chatre01a3ee22006-10-11 01:21:55 -070011 * For details of nodemask_scnprintf() and nodemask_parse_user(),
12 * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 * For details of nodelist_scnprintf() and nodelist_parse(), see
14 * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c.
Paul Jacksonfb5eeee2005-10-30 15:02:33 -080015 * For details of node_remap(), see bitmap_bitremap in lib/bitmap.c.
16 * For details of nodes_remap(), see bitmap_remap in lib/bitmap.c.
Paul Jackson7ea931c2008-04-28 02:12:29 -070017 * For details of nodes_onto(), see bitmap_onto in lib/bitmap.c.
18 * For details of nodes_fold(), see bitmap_fold in lib/bitmap.c.
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 *
20 * The available nodemask operations are:
21 *
22 * void node_set(node, mask) turn on bit 'node' in mask
23 * void node_clear(node, mask) turn off bit 'node' in mask
24 * void nodes_setall(mask) set all bits
25 * void nodes_clear(mask) clear all bits
26 * int node_isset(node, mask) true iff bit 'node' set in mask
27 * int node_test_and_set(node, mask) test and set bit 'node' in mask
28 *
29 * void nodes_and(dst, src1, src2) dst = src1 & src2 [intersection]
30 * void nodes_or(dst, src1, src2) dst = src1 | src2 [union]
31 * void nodes_xor(dst, src1, src2) dst = src1 ^ src2
32 * void nodes_andnot(dst, src1, src2) dst = src1 & ~src2
33 * void nodes_complement(dst, src) dst = ~src
34 *
35 * int nodes_equal(mask1, mask2) Does mask1 == mask2?
36 * int nodes_intersects(mask1, mask2) Do mask1 and mask2 intersect?
37 * int nodes_subset(mask1, mask2) Is mask1 a subset of mask2?
38 * int nodes_empty(mask) Is mask empty (no bits sets)?
39 * int nodes_full(mask) Is mask full (all bits sets)?
40 * int nodes_weight(mask) Hamming weight - number of set bits
41 *
42 * void nodes_shift_right(dst, src, n) Shift right
43 * void nodes_shift_left(dst, src, n) Shift left
44 *
45 * int first_node(mask) Number lowest set bit, or MAX_NUMNODES
46 * int next_node(node, mask) Next node past 'node', or MAX_NUMNODES
47 * int first_unset_node(mask) First node not set in mask, or
48 * MAX_NUMNODES.
49 *
50 * nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set
51 * NODE_MASK_ALL Initializer - all bits set
52 * NODE_MASK_NONE Initializer - no bits set
53 * unsigned long *nodes_addr(mask) Array of unsigned long's in mask
54 *
55 * int nodemask_scnprintf(buf, len, mask) Format nodemask for printing
Reinette Chatre01a3ee22006-10-11 01:21:55 -070056 * int nodemask_parse_user(ubuf, ulen, mask) Parse ascii string as nodemask
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing
58 * int nodelist_parse(buf, map) Parse ascii string as nodelist
Paul Jacksonfb5eeee2005-10-30 15:02:33 -080059 * int node_remap(oldbit, old, new) newbit = map(old, new)(oldbit)
Paul Jackson7ea931c2008-04-28 02:12:29 -070060 * void nodes_remap(dst, src, old, new) *dst = map(old, new)(src)
61 * void nodes_onto(dst, orig, relmap) *dst = orig relative to relmap
62 * void nodes_fold(dst, orig, sz) dst bits = orig bits mod sz
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 *
64 * for_each_node_mask(node, mask) for-loop node over mask
65 *
66 * int num_online_nodes() Number of online Nodes
67 * int num_possible_nodes() Number of all possible Nodes
68 *
Michal Hocko778d3b02011-07-26 16:08:30 -070069 * int node_random(mask) Random node with set bit in mask
70 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 * int node_online(node) Is some node online?
72 * int node_possible(node) Is some node possible?
73 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 * node_set_online(node) set bit 'node' in node_online_map
75 * node_set_offline(node) clear bit 'node' in node_online_map
76 *
77 * for_each_node(node) for-loop node over node_possible_map
78 * for_each_online_node(node) for-loop node over node_online_map
79 *
80 * Subtlety:
81 * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway)
82 * to generate slightly worse code. So use a simple one-line #define
83 * for node_isset(), instead of wrapping an inline inside a macro, the
84 * way we do the other calls.
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -070085 *
86 * NODEMASK_SCRATCH
87 * When doing above logical AND, OR, XOR, Remap operations the callers tend to
88 * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large,
89 * nodemask_t's consume too much stack space. NODEMASK_SCRATCH is a helper
90 * for such situations. See below and CPUMASK_ALLOC also.
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 */
92
93#include <linux/kernel.h>
94#include <linux/threads.h>
95#include <linux/bitmap.h>
96#include <linux/numa.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070097
98typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t;
99extern nodemask_t _unused_nodemask_arg_;
100
101#define node_set(node, dst) __node_set((node), &(dst))
102static inline void __node_set(int node, volatile nodemask_t *dstp)
103{
104 set_bit(node, dstp->bits);
105}
106
107#define node_clear(node, dst) __node_clear((node), &(dst))
108static inline void __node_clear(int node, volatile nodemask_t *dstp)
109{
110 clear_bit(node, dstp->bits);
111}
112
113#define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES)
114static inline void __nodes_setall(nodemask_t *dstp, int nbits)
115{
116 bitmap_fill(dstp->bits, nbits);
117}
118
119#define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES)
120static inline void __nodes_clear(nodemask_t *dstp, int nbits)
121{
122 bitmap_zero(dstp->bits, nbits);
123}
124
125/* No static inline type checking - see Subtlety (1) above. */
126#define node_isset(node, nodemask) test_bit((node), (nodemask).bits)
127
128#define node_test_and_set(node, nodemask) \
129 __node_test_and_set((node), &(nodemask))
130static inline int __node_test_and_set(int node, nodemask_t *addr)
131{
132 return test_and_set_bit(node, addr->bits);
133}
134
135#define nodes_and(dst, src1, src2) \
136 __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES)
137static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p,
138 const nodemask_t *src2p, int nbits)
139{
140 bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
141}
142
143#define nodes_or(dst, src1, src2) \
144 __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES)
145static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p,
146 const nodemask_t *src2p, int nbits)
147{
148 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
149}
150
151#define nodes_xor(dst, src1, src2) \
152 __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES)
153static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p,
154 const nodemask_t *src2p, int nbits)
155{
156 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
157}
158
159#define nodes_andnot(dst, src1, src2) \
160 __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES)
161static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p,
162 const nodemask_t *src2p, int nbits)
163{
164 bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
165}
166
167#define nodes_complement(dst, src) \
168 __nodes_complement(&(dst), &(src), MAX_NUMNODES)
169static inline void __nodes_complement(nodemask_t *dstp,
170 const nodemask_t *srcp, int nbits)
171{
172 bitmap_complement(dstp->bits, srcp->bits, nbits);
173}
174
175#define nodes_equal(src1, src2) \
176 __nodes_equal(&(src1), &(src2), MAX_NUMNODES)
177static inline int __nodes_equal(const nodemask_t *src1p,
178 const nodemask_t *src2p, int nbits)
179{
180 return bitmap_equal(src1p->bits, src2p->bits, nbits);
181}
182
183#define nodes_intersects(src1, src2) \
184 __nodes_intersects(&(src1), &(src2), MAX_NUMNODES)
185static inline int __nodes_intersects(const nodemask_t *src1p,
186 const nodemask_t *src2p, int nbits)
187{
188 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
189}
190
191#define nodes_subset(src1, src2) \
192 __nodes_subset(&(src1), &(src2), MAX_NUMNODES)
193static inline int __nodes_subset(const nodemask_t *src1p,
194 const nodemask_t *src2p, int nbits)
195{
196 return bitmap_subset(src1p->bits, src2p->bits, nbits);
197}
198
199#define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES)
200static inline int __nodes_empty(const nodemask_t *srcp, int nbits)
201{
202 return bitmap_empty(srcp->bits, nbits);
203}
204
205#define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES)
206static inline int __nodes_full(const nodemask_t *srcp, int nbits)
207{
208 return bitmap_full(srcp->bits, nbits);
209}
210
211#define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES)
212static inline int __nodes_weight(const nodemask_t *srcp, int nbits)
213{
214 return bitmap_weight(srcp->bits, nbits);
215}
216
217#define nodes_shift_right(dst, src, n) \
218 __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES)
219static inline void __nodes_shift_right(nodemask_t *dstp,
220 const nodemask_t *srcp, int n, int nbits)
221{
222 bitmap_shift_right(dstp->bits, srcp->bits, n, nbits);
223}
224
225#define nodes_shift_left(dst, src, n) \
226 __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES)
227static inline void __nodes_shift_left(nodemask_t *dstp,
228 const nodemask_t *srcp, int n, int nbits)
229{
230 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
231}
232
233/* FIXME: better would be to fix all architectures to never return
234 > MAX_NUMNODES, then the silly min_ts could be dropped. */
235
236#define first_node(src) __first_node(&(src))
237static inline int __first_node(const nodemask_t *srcp)
238{
239 return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES));
240}
241
242#define next_node(n, src) __next_node((n), &(src))
243static inline int __next_node(int n, const nodemask_t *srcp)
244{
245 return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1));
246}
247
Lee Schermerhornc1e6c8d2009-12-14 17:58:17 -0800248static inline void init_nodemask_of_node(nodemask_t *mask, int node)
249{
250 nodes_clear(*mask);
251 node_set(node, *mask);
252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254#define nodemask_of_node(node) \
255({ \
256 typeof(_unused_nodemask_arg_) m; \
257 if (sizeof(m) == sizeof(unsigned long)) { \
Lee Schermerhornc1e6c8d2009-12-14 17:58:17 -0800258 m.bits[0] = 1UL << (node); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 } else { \
Lee Schermerhornc1e6c8d2009-12-14 17:58:17 -0800260 init_nodemask_of_node(&m, (node)); \
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 } \
262 m; \
263})
264
265#define first_unset_node(mask) __first_unset_node(&(mask))
266static inline int __first_unset_node(const nodemask_t *maskp)
267{
268 return min_t(int,MAX_NUMNODES,
269 find_first_zero_bit(maskp->bits, MAX_NUMNODES));
270}
271
272#define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES)
273
274#if MAX_NUMNODES <= BITS_PER_LONG
275
276#define NODE_MASK_ALL \
277((nodemask_t) { { \
278 [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \
279} })
280
281#else
282
283#define NODE_MASK_ALL \
284((nodemask_t) { { \
285 [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL, \
286 [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \
287} })
288
289#endif
290
291#define NODE_MASK_NONE \
292((nodemask_t) { { \
293 [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] = 0UL \
294} })
295
296#define nodes_addr(src) ((src).bits)
297
298#define nodemask_scnprintf(buf, len, src) \
299 __nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES)
300static inline int __nodemask_scnprintf(char *buf, int len,
301 const nodemask_t *srcp, int nbits)
302{
303 return bitmap_scnprintf(buf, len, srcp->bits, nbits);
304}
305
Reinette Chatre01a3ee22006-10-11 01:21:55 -0700306#define nodemask_parse_user(ubuf, ulen, dst) \
307 __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES)
308static inline int __nodemask_parse_user(const char __user *buf, int len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 nodemask_t *dstp, int nbits)
310{
Reinette Chatre01a3ee22006-10-11 01:21:55 -0700311 return bitmap_parse_user(buf, len, dstp->bits, nbits);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
314#define nodelist_scnprintf(buf, len, src) \
315 __nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES)
316static inline int __nodelist_scnprintf(char *buf, int len,
317 const nodemask_t *srcp, int nbits)
318{
319 return bitmap_scnlistprintf(buf, len, srcp->bits, nbits);
320}
321
322#define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES)
323static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits)
324{
325 return bitmap_parselist(buf, dstp->bits, nbits);
326}
327
Paul Jacksonfb5eeee2005-10-30 15:02:33 -0800328#define node_remap(oldbit, old, new) \
329 __node_remap((oldbit), &(old), &(new), MAX_NUMNODES)
330static inline int __node_remap(int oldbit,
331 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
332{
333 return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits);
334}
335
336#define nodes_remap(dst, src, old, new) \
337 __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES)
338static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp,
339 const nodemask_t *oldp, const nodemask_t *newp, int nbits)
340{
341 bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits);
342}
343
Paul Jackson7ea931c2008-04-28 02:12:29 -0700344#define nodes_onto(dst, orig, relmap) \
345 __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES)
346static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp,
347 const nodemask_t *relmapp, int nbits)
348{
349 bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits);
350}
351
352#define nodes_fold(dst, orig, sz) \
353 __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES)
354static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp,
355 int sz, int nbits)
356{
357 bitmap_fold(dstp->bits, origp->bits, sz, nbits);
358}
359
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360#if MAX_NUMNODES > 1
361#define for_each_node_mask(node, mask) \
362 for ((node) = first_node(mask); \
363 (node) < MAX_NUMNODES; \
364 (node) = next_node((node), (mask)))
365#else /* MAX_NUMNODES == 1 */
366#define for_each_node_mask(node, mask) \
367 if (!nodes_empty(mask)) \
368 for ((node) = 0; (node) < 1; (node)++)
369#endif /* MAX_NUMNODES */
370
371/*
Christoph Lameter13808912007-10-16 01:25:27 -0700372 * Bitmasks that are kept for all the nodes.
373 */
374enum node_states {
Christoph Lameter7ea15302007-10-16 01:25:29 -0700375 N_POSSIBLE, /* The node could become online at some point */
376 N_ONLINE, /* The node is online */
377 N_NORMAL_MEMORY, /* The node has regular memory */
378#ifdef CONFIG_HIGHMEM
379 N_HIGH_MEMORY, /* The node has regular or high memory */
380#else
381 N_HIGH_MEMORY = N_NORMAL_MEMORY,
382#endif
Lai Jiangshan20b2f522012-12-12 13:52:00 -0800383#ifdef CONFIG_MOVABLE_NODE
384 N_MEMORY, /* The node has memory(regular, high, movable) */
385#else
Lai Jiangshan8219fc42012-12-12 13:51:21 -0800386 N_MEMORY = N_HIGH_MEMORY,
Lai Jiangshan20b2f522012-12-12 13:52:00 -0800387#endif
Christoph Lameter37c07082007-10-16 01:25:36 -0700388 N_CPU, /* The node has one or more cpus */
Christoph Lameter13808912007-10-16 01:25:27 -0700389 NR_NODE_STATES
390};
391
392/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 * The following particular system nodemasks and operations
394 * on them manage all possible and online nodes.
395 */
396
Christoph Lameter13808912007-10-16 01:25:27 -0700397extern nodemask_t node_states[NR_NODE_STATES];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399#if MAX_NUMNODES > 1
Christoph Lameter13808912007-10-16 01:25:27 -0700400static inline int node_state(int node, enum node_states state)
401{
402 return node_isset(node, node_states[state]);
403}
404
405static inline void node_set_state(int node, enum node_states state)
406{
407 __node_set(node, &node_states[state]);
408}
409
410static inline void node_clear_state(int node, enum node_states state)
411{
412 __node_clear(node, &node_states[state]);
413}
414
415static inline int num_node_state(enum node_states state)
416{
417 return nodes_weight(node_states[state]);
418}
419
420#define for_each_node_state(__node, __state) \
421 for_each_node_mask((__node), node_states[__state])
422
423#define first_online_node first_node(node_states[N_ONLINE])
424#define next_online_node(nid) next_node((nid), node_states[N_ONLINE])
425
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800426extern int nr_node_ids;
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700427extern int nr_online_nodes;
428
429static inline void node_set_online(int nid)
430{
431 node_set_state(nid, N_ONLINE);
432 nr_online_nodes = num_node_state(N_ONLINE);
433}
434
435static inline void node_set_offline(int nid)
436{
437 node_clear_state(nid, N_ONLINE);
438 nr_online_nodes = num_node_state(N_ONLINE);
439}
Michal Hocko778d3b02011-07-26 16:08:30 -0700440
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441#else
Christoph Lameter13808912007-10-16 01:25:27 -0700442
443static inline int node_state(int node, enum node_states state)
444{
445 return node == 0;
446}
447
448static inline void node_set_state(int node, enum node_states state)
449{
450}
451
452static inline void node_clear_state(int node, enum node_states state)
453{
454}
455
456static inline int num_node_state(enum node_states state)
457{
458 return 1;
459}
460
461#define for_each_node_state(node, __state) \
462 for ( (node) = 0; (node) == 0; (node) = 1)
463
KAMEZAWA Hiroyuki8357f862006-03-27 01:15:57 -0800464#define first_online_node 0
465#define next_online_node(nid) (MAX_NUMNODES)
Christoph Lameter74c7aa82007-02-20 13:57:51 -0800466#define nr_node_ids 1
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700467#define nr_online_nodes 1
Christoph Lameter13808912007-10-16 01:25:27 -0700468
Christoph Lameter62bc62a2009-06-16 15:32:15 -0700469#define node_set_online(node) node_set_state((node), N_ONLINE)
470#define node_set_offline(node) node_clear_state((node), N_ONLINE)
Michal Hocko778d3b02011-07-26 16:08:30 -0700471
472#endif
473
474#if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1)
475extern int node_random(const nodemask_t *maskp);
476#else
477static inline int node_random(const nodemask_t *mask)
478{
479 return 0;
480}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481#endif
482
Christoph Lameter13808912007-10-16 01:25:27 -0700483#define node_online_map node_states[N_ONLINE]
484#define node_possible_map node_states[N_POSSIBLE]
485
Christoph Lameter13808912007-10-16 01:25:27 -0700486#define num_online_nodes() num_node_state(N_ONLINE)
487#define num_possible_nodes() num_node_state(N_POSSIBLE)
488#define node_online(node) node_state((node), N_ONLINE)
489#define node_possible(node) node_state((node), N_POSSIBLE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490
Christoph Lameter13808912007-10-16 01:25:27 -0700491#define for_each_node(node) for_each_node_state(node, N_POSSIBLE)
492#define for_each_online_node(node) for_each_node_state(node, N_ONLINE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -0700494/*
David Rientjesbad44b52009-12-14 17:58:38 -0800495 * For nodemask scrach area.
496 * NODEMASK_ALLOC(type, name) allocates an object with a specified type and
497 * name.
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -0700498 */
David Rientjesbad44b52009-12-14 17:58:38 -0800499#if NODES_SHIFT > 8 /* nodemask_t > 256 bytes */
500#define NODEMASK_ALLOC(type, name, gfp_flags) \
501 type *name = kmalloc(sizeof(*name), gfp_flags)
502#define NODEMASK_FREE(m) kfree(m)
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -0700503#else
Miao Xie7baab932010-03-10 15:22:42 -0800504#define NODEMASK_ALLOC(type, name, gfp_flags) type _##name, *name = &_##name
David Rientjesbad44b52009-12-14 17:58:38 -0800505#define NODEMASK_FREE(m) do {} while (0)
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -0700506#endif
507
508/* A example struture for using NODEMASK_ALLOC, used in mempolicy. */
509struct nodemask_scratch {
510 nodemask_t mask1;
511 nodemask_t mask2;
512};
513
David Rientjesbad44b52009-12-14 17:58:38 -0800514#define NODEMASK_SCRATCH(x) \
515 NODEMASK_ALLOC(struct nodemask_scratch, x, \
516 GFP_KERNEL | __GFP_NORETRY)
David Rientjes4e7b8a62009-12-14 17:58:13 -0800517#define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x)
KAMEZAWA Hiroyuki4bfc4492009-08-06 15:07:33 -0700518
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520#endif /* __LINUX_NODEMASK_H */