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1da177e4 LT |
1 | #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 | * | |
01a3ee2b RC |
11 | * For details of nodemask_scnprintf() and nodemask_parse_user(), |
12 | * see bitmap_scnprintf() and bitmap_parse_user() in lib/bitmap.c. | |
1da177e4 LT |
13 | * For details of nodelist_scnprintf() and nodelist_parse(), see |
14 | * bitmap_scnlistprintf() and bitmap_parselist(), also in bitmap.c. | |
fb5eeeee PJ |
15 | * 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. | |
7ea931c9 PJ |
17 | * 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. | |
1da177e4 LT |
19 | * |
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 | |
01a3ee2b | 56 | * int nodemask_parse_user(ubuf, ulen, mask) Parse ascii string as nodemask |
1da177e4 LT |
57 | * int nodelist_scnprintf(buf, len, mask) Format nodemask as list for printing |
58 | * int nodelist_parse(buf, map) Parse ascii string as nodelist | |
fb5eeeee | 59 | * int node_remap(oldbit, old, new) newbit = map(old, new)(oldbit) |
7ea931c9 PJ |
60 | * 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 | |
1da177e4 LT |
63 | * |
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 | * | |
69 | * int node_online(node) Is some node online? | |
70 | * int node_possible(node) Is some node possible? | |
71 | * | |
1da177e4 LT |
72 | * node_set_online(node) set bit 'node' in node_online_map |
73 | * node_set_offline(node) clear bit 'node' in node_online_map | |
74 | * | |
75 | * for_each_node(node) for-loop node over node_possible_map | |
76 | * for_each_online_node(node) for-loop node over node_online_map | |
77 | * | |
78 | * Subtlety: | |
79 | * 1) The 'type-checked' form of node_isset() causes gcc (3.3.2, anyway) | |
80 | * to generate slightly worse code. So use a simple one-line #define | |
81 | * for node_isset(), instead of wrapping an inline inside a macro, the | |
82 | * way we do the other calls. | |
4bfc4495 KH |
83 | * |
84 | * NODEMASK_SCRATCH | |
85 | * When doing above logical AND, OR, XOR, Remap operations the callers tend to | |
86 | * need temporary nodemask_t's on the stack. But if NODES_SHIFT is large, | |
87 | * nodemask_t's consume too much stack space. NODEMASK_SCRATCH is a helper | |
88 | * for such situations. See below and CPUMASK_ALLOC also. | |
1da177e4 LT |
89 | */ |
90 | ||
91 | #include <linux/kernel.h> | |
92 | #include <linux/threads.h> | |
93 | #include <linux/bitmap.h> | |
94 | #include <linux/numa.h> | |
1da177e4 LT |
95 | |
96 | typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t; | |
97 | extern nodemask_t _unused_nodemask_arg_; | |
98 | ||
99 | #define node_set(node, dst) __node_set((node), &(dst)) | |
100 | static inline void __node_set(int node, volatile nodemask_t *dstp) | |
101 | { | |
102 | set_bit(node, dstp->bits); | |
103 | } | |
104 | ||
105 | #define node_clear(node, dst) __node_clear((node), &(dst)) | |
106 | static inline void __node_clear(int node, volatile nodemask_t *dstp) | |
107 | { | |
108 | clear_bit(node, dstp->bits); | |
109 | } | |
110 | ||
111 | #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES) | |
112 | static inline void __nodes_setall(nodemask_t *dstp, int nbits) | |
113 | { | |
114 | bitmap_fill(dstp->bits, nbits); | |
115 | } | |
116 | ||
117 | #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES) | |
118 | static inline void __nodes_clear(nodemask_t *dstp, int nbits) | |
119 | { | |
120 | bitmap_zero(dstp->bits, nbits); | |
121 | } | |
122 | ||
123 | /* No static inline type checking - see Subtlety (1) above. */ | |
124 | #define node_isset(node, nodemask) test_bit((node), (nodemask).bits) | |
125 | ||
126 | #define node_test_and_set(node, nodemask) \ | |
127 | __node_test_and_set((node), &(nodemask)) | |
128 | static inline int __node_test_and_set(int node, nodemask_t *addr) | |
129 | { | |
130 | return test_and_set_bit(node, addr->bits); | |
131 | } | |
132 | ||
133 | #define nodes_and(dst, src1, src2) \ | |
134 | __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
135 | static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p, | |
136 | const nodemask_t *src2p, int nbits) | |
137 | { | |
138 | bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); | |
139 | } | |
140 | ||
141 | #define nodes_or(dst, src1, src2) \ | |
142 | __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
143 | static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p, | |
144 | const nodemask_t *src2p, int nbits) | |
145 | { | |
146 | bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); | |
147 | } | |
148 | ||
149 | #define nodes_xor(dst, src1, src2) \ | |
150 | __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
151 | static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p, | |
152 | const nodemask_t *src2p, int nbits) | |
153 | { | |
154 | bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); | |
155 | } | |
156 | ||
157 | #define nodes_andnot(dst, src1, src2) \ | |
158 | __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
159 | static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p, | |
160 | const nodemask_t *src2p, int nbits) | |
161 | { | |
162 | bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); | |
163 | } | |
164 | ||
165 | #define nodes_complement(dst, src) \ | |
166 | __nodes_complement(&(dst), &(src), MAX_NUMNODES) | |
167 | static inline void __nodes_complement(nodemask_t *dstp, | |
168 | const nodemask_t *srcp, int nbits) | |
169 | { | |
170 | bitmap_complement(dstp->bits, srcp->bits, nbits); | |
171 | } | |
172 | ||
173 | #define nodes_equal(src1, src2) \ | |
174 | __nodes_equal(&(src1), &(src2), MAX_NUMNODES) | |
175 | static inline int __nodes_equal(const nodemask_t *src1p, | |
176 | const nodemask_t *src2p, int nbits) | |
177 | { | |
178 | return bitmap_equal(src1p->bits, src2p->bits, nbits); | |
179 | } | |
180 | ||
181 | #define nodes_intersects(src1, src2) \ | |
182 | __nodes_intersects(&(src1), &(src2), MAX_NUMNODES) | |
183 | static inline int __nodes_intersects(const nodemask_t *src1p, | |
184 | const nodemask_t *src2p, int nbits) | |
185 | { | |
186 | return bitmap_intersects(src1p->bits, src2p->bits, nbits); | |
187 | } | |
188 | ||
189 | #define nodes_subset(src1, src2) \ | |
190 | __nodes_subset(&(src1), &(src2), MAX_NUMNODES) | |
191 | static inline int __nodes_subset(const nodemask_t *src1p, | |
192 | const nodemask_t *src2p, int nbits) | |
193 | { | |
194 | return bitmap_subset(src1p->bits, src2p->bits, nbits); | |
195 | } | |
196 | ||
197 | #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES) | |
198 | static inline int __nodes_empty(const nodemask_t *srcp, int nbits) | |
199 | { | |
200 | return bitmap_empty(srcp->bits, nbits); | |
201 | } | |
202 | ||
203 | #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES) | |
204 | static inline int __nodes_full(const nodemask_t *srcp, int nbits) | |
205 | { | |
206 | return bitmap_full(srcp->bits, nbits); | |
207 | } | |
208 | ||
209 | #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES) | |
210 | static inline int __nodes_weight(const nodemask_t *srcp, int nbits) | |
211 | { | |
212 | return bitmap_weight(srcp->bits, nbits); | |
213 | } | |
214 | ||
215 | #define nodes_shift_right(dst, src, n) \ | |
216 | __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES) | |
217 | static inline void __nodes_shift_right(nodemask_t *dstp, | |
218 | const nodemask_t *srcp, int n, int nbits) | |
219 | { | |
220 | bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); | |
221 | } | |
222 | ||
223 | #define nodes_shift_left(dst, src, n) \ | |
224 | __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES) | |
225 | static inline void __nodes_shift_left(nodemask_t *dstp, | |
226 | const nodemask_t *srcp, int n, int nbits) | |
227 | { | |
228 | bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); | |
229 | } | |
230 | ||
231 | /* FIXME: better would be to fix all architectures to never return | |
232 | > MAX_NUMNODES, then the silly min_ts could be dropped. */ | |
233 | ||
234 | #define first_node(src) __first_node(&(src)) | |
235 | static inline int __first_node(const nodemask_t *srcp) | |
236 | { | |
237 | return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES)); | |
238 | } | |
239 | ||
240 | #define next_node(n, src) __next_node((n), &(src)) | |
241 | static inline int __next_node(int n, const nodemask_t *srcp) | |
242 | { | |
243 | return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1)); | |
244 | } | |
245 | ||
c1e6c8d0 LS |
246 | static inline void init_nodemask_of_node(nodemask_t *mask, int node) |
247 | { | |
248 | nodes_clear(*mask); | |
249 | node_set(node, *mask); | |
250 | } | |
251 | ||
1da177e4 LT |
252 | #define nodemask_of_node(node) \ |
253 | ({ \ | |
254 | typeof(_unused_nodemask_arg_) m; \ | |
255 | if (sizeof(m) == sizeof(unsigned long)) { \ | |
c1e6c8d0 | 256 | m.bits[0] = 1UL << (node); \ |
1da177e4 | 257 | } else { \ |
c1e6c8d0 | 258 | init_nodemask_of_node(&m, (node)); \ |
1da177e4 LT |
259 | } \ |
260 | m; \ | |
261 | }) | |
262 | ||
263 | #define first_unset_node(mask) __first_unset_node(&(mask)) | |
264 | static inline int __first_unset_node(const nodemask_t *maskp) | |
265 | { | |
266 | return min_t(int,MAX_NUMNODES, | |
267 | find_first_zero_bit(maskp->bits, MAX_NUMNODES)); | |
268 | } | |
269 | ||
270 | #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES) | |
271 | ||
272 | #if MAX_NUMNODES <= BITS_PER_LONG | |
273 | ||
274 | #define NODE_MASK_ALL \ | |
275 | ((nodemask_t) { { \ | |
276 | [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ | |
277 | } }) | |
278 | ||
279 | #else | |
280 | ||
281 | #define NODE_MASK_ALL \ | |
282 | ((nodemask_t) { { \ | |
283 | [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL, \ | |
284 | [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ | |
285 | } }) | |
286 | ||
287 | #endif | |
288 | ||
289 | #define NODE_MASK_NONE \ | |
290 | ((nodemask_t) { { \ | |
291 | [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] = 0UL \ | |
292 | } }) | |
293 | ||
294 | #define nodes_addr(src) ((src).bits) | |
295 | ||
296 | #define nodemask_scnprintf(buf, len, src) \ | |
297 | __nodemask_scnprintf((buf), (len), &(src), MAX_NUMNODES) | |
298 | static inline int __nodemask_scnprintf(char *buf, int len, | |
299 | const nodemask_t *srcp, int nbits) | |
300 | { | |
301 | return bitmap_scnprintf(buf, len, srcp->bits, nbits); | |
302 | } | |
303 | ||
01a3ee2b RC |
304 | #define nodemask_parse_user(ubuf, ulen, dst) \ |
305 | __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES) | |
306 | static inline int __nodemask_parse_user(const char __user *buf, int len, | |
1da177e4 LT |
307 | nodemask_t *dstp, int nbits) |
308 | { | |
01a3ee2b | 309 | return bitmap_parse_user(buf, len, dstp->bits, nbits); |
1da177e4 LT |
310 | } |
311 | ||
312 | #define nodelist_scnprintf(buf, len, src) \ | |
313 | __nodelist_scnprintf((buf), (len), &(src), MAX_NUMNODES) | |
314 | static inline int __nodelist_scnprintf(char *buf, int len, | |
315 | const nodemask_t *srcp, int nbits) | |
316 | { | |
317 | return bitmap_scnlistprintf(buf, len, srcp->bits, nbits); | |
318 | } | |
319 | ||
320 | #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES) | |
321 | static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits) | |
322 | { | |
323 | return bitmap_parselist(buf, dstp->bits, nbits); | |
324 | } | |
325 | ||
fb5eeeee PJ |
326 | #define node_remap(oldbit, old, new) \ |
327 | __node_remap((oldbit), &(old), &(new), MAX_NUMNODES) | |
328 | static inline int __node_remap(int oldbit, | |
329 | const nodemask_t *oldp, const nodemask_t *newp, int nbits) | |
330 | { | |
331 | return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits); | |
332 | } | |
333 | ||
334 | #define nodes_remap(dst, src, old, new) \ | |
335 | __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES) | |
336 | static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp, | |
337 | const nodemask_t *oldp, const nodemask_t *newp, int nbits) | |
338 | { | |
339 | bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits); | |
340 | } | |
341 | ||
7ea931c9 PJ |
342 | #define nodes_onto(dst, orig, relmap) \ |
343 | __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES) | |
344 | static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp, | |
345 | const nodemask_t *relmapp, int nbits) | |
346 | { | |
347 | bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits); | |
348 | } | |
349 | ||
350 | #define nodes_fold(dst, orig, sz) \ | |
351 | __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES) | |
352 | static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp, | |
353 | int sz, int nbits) | |
354 | { | |
355 | bitmap_fold(dstp->bits, origp->bits, sz, nbits); | |
356 | } | |
357 | ||
1da177e4 LT |
358 | #if MAX_NUMNODES > 1 |
359 | #define for_each_node_mask(node, mask) \ | |
360 | for ((node) = first_node(mask); \ | |
361 | (node) < MAX_NUMNODES; \ | |
362 | (node) = next_node((node), (mask))) | |
363 | #else /* MAX_NUMNODES == 1 */ | |
364 | #define for_each_node_mask(node, mask) \ | |
365 | if (!nodes_empty(mask)) \ | |
366 | for ((node) = 0; (node) < 1; (node)++) | |
367 | #endif /* MAX_NUMNODES */ | |
368 | ||
13808910 CL |
369 | /* |
370 | * Bitmasks that are kept for all the nodes. | |
371 | */ | |
372 | enum node_states { | |
7ea1530a CL |
373 | N_POSSIBLE, /* The node could become online at some point */ |
374 | N_ONLINE, /* The node is online */ | |
375 | N_NORMAL_MEMORY, /* The node has regular memory */ | |
376 | #ifdef CONFIG_HIGHMEM | |
377 | N_HIGH_MEMORY, /* The node has regular or high memory */ | |
378 | #else | |
379 | N_HIGH_MEMORY = N_NORMAL_MEMORY, | |
380 | #endif | |
37c0708d | 381 | N_CPU, /* The node has one or more cpus */ |
13808910 CL |
382 | NR_NODE_STATES |
383 | }; | |
384 | ||
1da177e4 LT |
385 | /* |
386 | * The following particular system nodemasks and operations | |
387 | * on them manage all possible and online nodes. | |
388 | */ | |
389 | ||
13808910 | 390 | extern nodemask_t node_states[NR_NODE_STATES]; |
1da177e4 LT |
391 | |
392 | #if MAX_NUMNODES > 1 | |
13808910 CL |
393 | static inline int node_state(int node, enum node_states state) |
394 | { | |
395 | return node_isset(node, node_states[state]); | |
396 | } | |
397 | ||
398 | static inline void node_set_state(int node, enum node_states state) | |
399 | { | |
400 | __node_set(node, &node_states[state]); | |
401 | } | |
402 | ||
403 | static inline void node_clear_state(int node, enum node_states state) | |
404 | { | |
405 | __node_clear(node, &node_states[state]); | |
406 | } | |
407 | ||
408 | static inline int num_node_state(enum node_states state) | |
409 | { | |
410 | return nodes_weight(node_states[state]); | |
411 | } | |
412 | ||
413 | #define for_each_node_state(__node, __state) \ | |
414 | for_each_node_mask((__node), node_states[__state]) | |
415 | ||
416 | #define first_online_node first_node(node_states[N_ONLINE]) | |
417 | #define next_online_node(nid) next_node((nid), node_states[N_ONLINE]) | |
418 | ||
74c7aa8b | 419 | extern int nr_node_ids; |
62bc62a8 CL |
420 | extern int nr_online_nodes; |
421 | ||
422 | static inline void node_set_online(int nid) | |
423 | { | |
424 | node_set_state(nid, N_ONLINE); | |
425 | nr_online_nodes = num_node_state(N_ONLINE); | |
426 | } | |
427 | ||
428 | static inline void node_set_offline(int nid) | |
429 | { | |
430 | node_clear_state(nid, N_ONLINE); | |
431 | nr_online_nodes = num_node_state(N_ONLINE); | |
432 | } | |
1da177e4 | 433 | #else |
13808910 CL |
434 | |
435 | static inline int node_state(int node, enum node_states state) | |
436 | { | |
437 | return node == 0; | |
438 | } | |
439 | ||
440 | static inline void node_set_state(int node, enum node_states state) | |
441 | { | |
442 | } | |
443 | ||
444 | static inline void node_clear_state(int node, enum node_states state) | |
445 | { | |
446 | } | |
447 | ||
448 | static inline int num_node_state(enum node_states state) | |
449 | { | |
450 | return 1; | |
451 | } | |
452 | ||
453 | #define for_each_node_state(node, __state) \ | |
454 | for ( (node) = 0; (node) == 0; (node) = 1) | |
455 | ||
8357f869 KH |
456 | #define first_online_node 0 |
457 | #define next_online_node(nid) (MAX_NUMNODES) | |
74c7aa8b | 458 | #define nr_node_ids 1 |
62bc62a8 | 459 | #define nr_online_nodes 1 |
13808910 | 460 | |
62bc62a8 CL |
461 | #define node_set_online(node) node_set_state((node), N_ONLINE) |
462 | #define node_set_offline(node) node_clear_state((node), N_ONLINE) | |
1da177e4 LT |
463 | #endif |
464 | ||
13808910 CL |
465 | #define node_online_map node_states[N_ONLINE] |
466 | #define node_possible_map node_states[N_POSSIBLE] | |
467 | ||
13808910 CL |
468 | #define num_online_nodes() num_node_state(N_ONLINE) |
469 | #define num_possible_nodes() num_node_state(N_POSSIBLE) | |
470 | #define node_online(node) node_state((node), N_ONLINE) | |
471 | #define node_possible(node) node_state((node), N_POSSIBLE) | |
472 | ||
13808910 CL |
473 | #define for_each_node(node) for_each_node_state(node, N_POSSIBLE) |
474 | #define for_each_online_node(node) for_each_node_state(node, N_ONLINE) | |
1da177e4 | 475 | |
4bfc4495 | 476 | /* |
bad44b5b DR |
477 | * For nodemask scrach area. |
478 | * NODEMASK_ALLOC(type, name) allocates an object with a specified type and | |
479 | * name. | |
4bfc4495 | 480 | */ |
bad44b5b DR |
481 | #if NODES_SHIFT > 8 /* nodemask_t > 256 bytes */ |
482 | #define NODEMASK_ALLOC(type, name, gfp_flags) \ | |
483 | type *name = kmalloc(sizeof(*name), gfp_flags) | |
484 | #define NODEMASK_FREE(m) kfree(m) | |
4bfc4495 | 485 | #else |
7baab93f | 486 | #define NODEMASK_ALLOC(type, name, gfp_flags) type _##name, *name = &_##name |
bad44b5b | 487 | #define NODEMASK_FREE(m) do {} while (0) |
4bfc4495 KH |
488 | #endif |
489 | ||
490 | /* A example struture for using NODEMASK_ALLOC, used in mempolicy. */ | |
491 | struct nodemask_scratch { | |
492 | nodemask_t mask1; | |
493 | nodemask_t mask2; | |
494 | }; | |
495 | ||
bad44b5b DR |
496 | #define NODEMASK_SCRATCH(x) \ |
497 | NODEMASK_ALLOC(struct nodemask_scratch, x, \ | |
498 | GFP_KERNEL | __GFP_NORETRY) | |
4e7b8a6c | 499 | #define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x) |
4bfc4495 KH |
500 | |
501 | ||
1da177e4 | 502 | #endif /* __LINUX_NODEMASK_H */ |