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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
2 | #ifndef __LINUX_NODEMASK_H |
3 | #define __LINUX_NODEMASK_H | |
4 | ||
5 | /* | |
6 | * Nodemasks provide a bitmap suitable for representing the | |
7 | * set of Node's in a system, one bit position per Node number. | |
8 | * | |
9 | * See detailed comments in the file linux/bitmap.h describing the | |
10 | * data type on which these nodemasks are based. | |
11 | * | |
46385326 TH |
12 | * For details of nodemask_parse_user(), see bitmap_parse_user() in |
13 | * lib/bitmap.c. For details of nodelist_parse(), see bitmap_parselist(), | |
14 | * also in bitmap.c. For details of node_remap(), see bitmap_bitremap in | |
15 | * lib/bitmap.c. For details of nodes_remap(), see bitmap_remap in | |
16 | * lib/bitmap.c. For details of nodes_onto(), see bitmap_onto in | |
17 | * lib/bitmap.c. For details of nodes_fold(), see bitmap_fold in | |
18 | * 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 | |
0edaf86c AM |
47 | * int next_node_in(node, mask) Next node past 'node', or wrap to first, |
48 | * or MAX_NUMNODES | |
1da177e4 | 49 | * int first_unset_node(mask) First node not set in mask, or |
0edaf86c | 50 | * MAX_NUMNODES |
1da177e4 LT |
51 | * |
52 | * nodemask_t nodemask_of_node(node) Return nodemask with bit 'node' set | |
53 | * NODE_MASK_ALL Initializer - all bits set | |
54 | * NODE_MASK_NONE Initializer - no bits set | |
55 | * unsigned long *nodes_addr(mask) Array of unsigned long's in mask | |
56 | * | |
01a3ee2b | 57 | * int nodemask_parse_user(ubuf, ulen, mask) Parse ascii string as nodemask |
1da177e4 | 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 | * | |
778d3b0f MH |
69 | * int node_random(mask) Random node with set bit in mask |
70 | * | |
1da177e4 LT |
71 | * int node_online(node) Is some node online? |
72 | * int node_possible(node) Is some node possible? | |
73 | * | |
1da177e4 LT |
74 | * 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. | |
4bfc4495 KH |
85 | * |
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. | |
1da177e4 LT |
91 | */ |
92 | ||
1da177e4 LT |
93 | #include <linux/threads.h> |
94 | #include <linux/bitmap.h> | |
b296a6d5 | 95 | #include <linux/minmax.h> |
1da177e4 | 96 | #include <linux/numa.h> |
1da177e4 LT |
97 | |
98 | typedef struct { DECLARE_BITMAP(bits, MAX_NUMNODES); } nodemask_t; | |
99 | extern nodemask_t _unused_nodemask_arg_; | |
100 | ||
f1bbc032 TH |
101 | /** |
102 | * nodemask_pr_args - printf args to output a nodemask | |
103 | * @maskp: nodemask to be printed | |
104 | * | |
105 | * Can be used to provide arguments for '%*pb[l]' when printing a nodemask. | |
106 | */ | |
1334be36 AB |
107 | #define nodemask_pr_args(maskp) __nodemask_pr_numnodes(maskp), \ |
108 | __nodemask_pr_bits(maskp) | |
109 | static inline unsigned int __nodemask_pr_numnodes(const nodemask_t *m) | |
110 | { | |
111 | return m ? MAX_NUMNODES : 0; | |
112 | } | |
113 | static inline const unsigned long *__nodemask_pr_bits(const nodemask_t *m) | |
114 | { | |
115 | return m ? m->bits : NULL; | |
116 | } | |
f1bbc032 | 117 | |
323f54ed TR |
118 | /* |
119 | * The inline keyword gives the compiler room to decide to inline, or | |
120 | * not inline a function as it sees best. However, as these functions | |
121 | * are called in both __init and non-__init functions, if they are not | |
c23c8082 | 122 | * inlined we will end up with a section mismatch error (of the type of |
323f54ed TR |
123 | * freeable items not being freed). So we must use __always_inline here |
124 | * to fix the problem. If other functions in the future also end up in | |
125 | * this situation they will also need to be annotated as __always_inline | |
126 | */ | |
1da177e4 | 127 | #define node_set(node, dst) __node_set((node), &(dst)) |
323f54ed | 128 | static __always_inline void __node_set(int node, volatile nodemask_t *dstp) |
1da177e4 LT |
129 | { |
130 | set_bit(node, dstp->bits); | |
131 | } | |
132 | ||
133 | #define node_clear(node, dst) __node_clear((node), &(dst)) | |
134 | static inline void __node_clear(int node, volatile nodemask_t *dstp) | |
135 | { | |
136 | clear_bit(node, dstp->bits); | |
137 | } | |
138 | ||
139 | #define nodes_setall(dst) __nodes_setall(&(dst), MAX_NUMNODES) | |
33c4fa8c | 140 | static inline void __nodes_setall(nodemask_t *dstp, unsigned int nbits) |
1da177e4 LT |
141 | { |
142 | bitmap_fill(dstp->bits, nbits); | |
143 | } | |
144 | ||
145 | #define nodes_clear(dst) __nodes_clear(&(dst), MAX_NUMNODES) | |
33c4fa8c | 146 | static inline void __nodes_clear(nodemask_t *dstp, unsigned int nbits) |
1da177e4 LT |
147 | { |
148 | bitmap_zero(dstp->bits, nbits); | |
149 | } | |
150 | ||
151 | /* No static inline type checking - see Subtlety (1) above. */ | |
152 | #define node_isset(node, nodemask) test_bit((node), (nodemask).bits) | |
153 | ||
154 | #define node_test_and_set(node, nodemask) \ | |
155 | __node_test_and_set((node), &(nodemask)) | |
156 | static inline int __node_test_and_set(int node, nodemask_t *addr) | |
157 | { | |
158 | return test_and_set_bit(node, addr->bits); | |
159 | } | |
160 | ||
161 | #define nodes_and(dst, src1, src2) \ | |
162 | __nodes_and(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
163 | static inline void __nodes_and(nodemask_t *dstp, const nodemask_t *src1p, | |
33c4fa8c | 164 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
165 | { |
166 | bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); | |
167 | } | |
168 | ||
169 | #define nodes_or(dst, src1, src2) \ | |
170 | __nodes_or(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
171 | static inline void __nodes_or(nodemask_t *dstp, const nodemask_t *src1p, | |
33c4fa8c | 172 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
173 | { |
174 | bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); | |
175 | } | |
176 | ||
177 | #define nodes_xor(dst, src1, src2) \ | |
178 | __nodes_xor(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
179 | static inline void __nodes_xor(nodemask_t *dstp, const nodemask_t *src1p, | |
33c4fa8c | 180 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
181 | { |
182 | bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); | |
183 | } | |
184 | ||
185 | #define nodes_andnot(dst, src1, src2) \ | |
186 | __nodes_andnot(&(dst), &(src1), &(src2), MAX_NUMNODES) | |
187 | static inline void __nodes_andnot(nodemask_t *dstp, const nodemask_t *src1p, | |
33c4fa8c | 188 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
189 | { |
190 | bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); | |
191 | } | |
192 | ||
193 | #define nodes_complement(dst, src) \ | |
194 | __nodes_complement(&(dst), &(src), MAX_NUMNODES) | |
195 | static inline void __nodes_complement(nodemask_t *dstp, | |
33c4fa8c | 196 | const nodemask_t *srcp, unsigned int nbits) |
1da177e4 LT |
197 | { |
198 | bitmap_complement(dstp->bits, srcp->bits, nbits); | |
199 | } | |
200 | ||
201 | #define nodes_equal(src1, src2) \ | |
202 | __nodes_equal(&(src1), &(src2), MAX_NUMNODES) | |
203 | static inline int __nodes_equal(const nodemask_t *src1p, | |
33c4fa8c | 204 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
205 | { |
206 | return bitmap_equal(src1p->bits, src2p->bits, nbits); | |
207 | } | |
208 | ||
209 | #define nodes_intersects(src1, src2) \ | |
210 | __nodes_intersects(&(src1), &(src2), MAX_NUMNODES) | |
211 | static inline int __nodes_intersects(const nodemask_t *src1p, | |
33c4fa8c | 212 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
213 | { |
214 | return bitmap_intersects(src1p->bits, src2p->bits, nbits); | |
215 | } | |
216 | ||
217 | #define nodes_subset(src1, src2) \ | |
218 | __nodes_subset(&(src1), &(src2), MAX_NUMNODES) | |
219 | static inline int __nodes_subset(const nodemask_t *src1p, | |
33c4fa8c | 220 | const nodemask_t *src2p, unsigned int nbits) |
1da177e4 LT |
221 | { |
222 | return bitmap_subset(src1p->bits, src2p->bits, nbits); | |
223 | } | |
224 | ||
225 | #define nodes_empty(src) __nodes_empty(&(src), MAX_NUMNODES) | |
33c4fa8c | 226 | static inline int __nodes_empty(const nodemask_t *srcp, unsigned int nbits) |
1da177e4 LT |
227 | { |
228 | return bitmap_empty(srcp->bits, nbits); | |
229 | } | |
230 | ||
231 | #define nodes_full(nodemask) __nodes_full(&(nodemask), MAX_NUMNODES) | |
33c4fa8c | 232 | static inline int __nodes_full(const nodemask_t *srcp, unsigned int nbits) |
1da177e4 LT |
233 | { |
234 | return bitmap_full(srcp->bits, nbits); | |
235 | } | |
236 | ||
237 | #define nodes_weight(nodemask) __nodes_weight(&(nodemask), MAX_NUMNODES) | |
33c4fa8c | 238 | static inline int __nodes_weight(const nodemask_t *srcp, unsigned int nbits) |
1da177e4 LT |
239 | { |
240 | return bitmap_weight(srcp->bits, nbits); | |
241 | } | |
242 | ||
243 | #define nodes_shift_right(dst, src, n) \ | |
244 | __nodes_shift_right(&(dst), &(src), (n), MAX_NUMNODES) | |
245 | static inline void __nodes_shift_right(nodemask_t *dstp, | |
246 | const nodemask_t *srcp, int n, int nbits) | |
247 | { | |
248 | bitmap_shift_right(dstp->bits, srcp->bits, n, nbits); | |
249 | } | |
250 | ||
251 | #define nodes_shift_left(dst, src, n) \ | |
252 | __nodes_shift_left(&(dst), &(src), (n), MAX_NUMNODES) | |
253 | static inline void __nodes_shift_left(nodemask_t *dstp, | |
254 | const nodemask_t *srcp, int n, int nbits) | |
255 | { | |
256 | bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); | |
257 | } | |
258 | ||
259 | /* FIXME: better would be to fix all architectures to never return | |
260 | > MAX_NUMNODES, then the silly min_ts could be dropped. */ | |
261 | ||
262 | #define first_node(src) __first_node(&(src)) | |
263 | static inline int __first_node(const nodemask_t *srcp) | |
264 | { | |
265 | return min_t(int, MAX_NUMNODES, find_first_bit(srcp->bits, MAX_NUMNODES)); | |
266 | } | |
267 | ||
268 | #define next_node(n, src) __next_node((n), &(src)) | |
269 | static inline int __next_node(int n, const nodemask_t *srcp) | |
270 | { | |
271 | return min_t(int,MAX_NUMNODES,find_next_bit(srcp->bits, MAX_NUMNODES, n+1)); | |
272 | } | |
273 | ||
0edaf86c AM |
274 | /* |
275 | * Find the next present node in src, starting after node n, wrapping around to | |
276 | * the first node in src if needed. Returns MAX_NUMNODES if src is empty. | |
277 | */ | |
278 | #define next_node_in(n, src) __next_node_in((n), &(src)) | |
279 | int __next_node_in(int node, const nodemask_t *srcp); | |
280 | ||
c1e6c8d0 LS |
281 | static inline void init_nodemask_of_node(nodemask_t *mask, int node) |
282 | { | |
283 | nodes_clear(*mask); | |
284 | node_set(node, *mask); | |
285 | } | |
286 | ||
1da177e4 LT |
287 | #define nodemask_of_node(node) \ |
288 | ({ \ | |
289 | typeof(_unused_nodemask_arg_) m; \ | |
290 | if (sizeof(m) == sizeof(unsigned long)) { \ | |
c1e6c8d0 | 291 | m.bits[0] = 1UL << (node); \ |
1da177e4 | 292 | } else { \ |
c1e6c8d0 | 293 | init_nodemask_of_node(&m, (node)); \ |
1da177e4 LT |
294 | } \ |
295 | m; \ | |
296 | }) | |
297 | ||
298 | #define first_unset_node(mask) __first_unset_node(&(mask)) | |
299 | static inline int __first_unset_node(const nodemask_t *maskp) | |
300 | { | |
301 | return min_t(int,MAX_NUMNODES, | |
302 | find_first_zero_bit(maskp->bits, MAX_NUMNODES)); | |
303 | } | |
304 | ||
305 | #define NODE_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(MAX_NUMNODES) | |
306 | ||
307 | #if MAX_NUMNODES <= BITS_PER_LONG | |
308 | ||
309 | #define NODE_MASK_ALL \ | |
310 | ((nodemask_t) { { \ | |
311 | [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ | |
312 | } }) | |
313 | ||
314 | #else | |
315 | ||
316 | #define NODE_MASK_ALL \ | |
317 | ((nodemask_t) { { \ | |
318 | [0 ... BITS_TO_LONGS(MAX_NUMNODES)-2] = ~0UL, \ | |
319 | [BITS_TO_LONGS(MAX_NUMNODES)-1] = NODE_MASK_LAST_WORD \ | |
320 | } }) | |
321 | ||
322 | #endif | |
323 | ||
324 | #define NODE_MASK_NONE \ | |
325 | ((nodemask_t) { { \ | |
326 | [0 ... BITS_TO_LONGS(MAX_NUMNODES)-1] = 0UL \ | |
327 | } }) | |
328 | ||
329 | #define nodes_addr(src) ((src).bits) | |
330 | ||
01a3ee2b RC |
331 | #define nodemask_parse_user(ubuf, ulen, dst) \ |
332 | __nodemask_parse_user((ubuf), (ulen), &(dst), MAX_NUMNODES) | |
333 | static inline int __nodemask_parse_user(const char __user *buf, int len, | |
1da177e4 LT |
334 | nodemask_t *dstp, int nbits) |
335 | { | |
01a3ee2b | 336 | return bitmap_parse_user(buf, len, dstp->bits, nbits); |
1da177e4 LT |
337 | } |
338 | ||
1da177e4 LT |
339 | #define nodelist_parse(buf, dst) __nodelist_parse((buf), &(dst), MAX_NUMNODES) |
340 | static inline int __nodelist_parse(const char *buf, nodemask_t *dstp, int nbits) | |
341 | { | |
342 | return bitmap_parselist(buf, dstp->bits, nbits); | |
343 | } | |
344 | ||
fb5eeeee PJ |
345 | #define node_remap(oldbit, old, new) \ |
346 | __node_remap((oldbit), &(old), &(new), MAX_NUMNODES) | |
347 | static inline int __node_remap(int oldbit, | |
348 | const nodemask_t *oldp, const nodemask_t *newp, int nbits) | |
349 | { | |
350 | return bitmap_bitremap(oldbit, oldp->bits, newp->bits, nbits); | |
351 | } | |
352 | ||
353 | #define nodes_remap(dst, src, old, new) \ | |
354 | __nodes_remap(&(dst), &(src), &(old), &(new), MAX_NUMNODES) | |
355 | static inline void __nodes_remap(nodemask_t *dstp, const nodemask_t *srcp, | |
356 | const nodemask_t *oldp, const nodemask_t *newp, int nbits) | |
357 | { | |
358 | bitmap_remap(dstp->bits, srcp->bits, oldp->bits, newp->bits, nbits); | |
359 | } | |
360 | ||
7ea931c9 PJ |
361 | #define nodes_onto(dst, orig, relmap) \ |
362 | __nodes_onto(&(dst), &(orig), &(relmap), MAX_NUMNODES) | |
363 | static inline void __nodes_onto(nodemask_t *dstp, const nodemask_t *origp, | |
364 | const nodemask_t *relmapp, int nbits) | |
365 | { | |
366 | bitmap_onto(dstp->bits, origp->bits, relmapp->bits, nbits); | |
367 | } | |
368 | ||
369 | #define nodes_fold(dst, orig, sz) \ | |
370 | __nodes_fold(&(dst), &(orig), sz, MAX_NUMNODES) | |
371 | static inline void __nodes_fold(nodemask_t *dstp, const nodemask_t *origp, | |
372 | int sz, int nbits) | |
373 | { | |
374 | bitmap_fold(dstp->bits, origp->bits, sz, nbits); | |
375 | } | |
376 | ||
1da177e4 LT |
377 | #if MAX_NUMNODES > 1 |
378 | #define for_each_node_mask(node, mask) \ | |
379 | for ((node) = first_node(mask); \ | |
380 | (node) < MAX_NUMNODES; \ | |
381 | (node) = next_node((node), (mask))) | |
382 | #else /* MAX_NUMNODES == 1 */ | |
383 | #define for_each_node_mask(node, mask) \ | |
384 | if (!nodes_empty(mask)) \ | |
385 | for ((node) = 0; (node) < 1; (node)++) | |
386 | #endif /* MAX_NUMNODES */ | |
387 | ||
13808910 CL |
388 | /* |
389 | * Bitmasks that are kept for all the nodes. | |
390 | */ | |
391 | enum node_states { | |
7ea1530a CL |
392 | N_POSSIBLE, /* The node could become online at some point */ |
393 | N_ONLINE, /* The node is online */ | |
394 | N_NORMAL_MEMORY, /* The node has regular memory */ | |
395 | #ifdef CONFIG_HIGHMEM | |
396 | N_HIGH_MEMORY, /* The node has regular or high memory */ | |
397 | #else | |
398 | N_HIGH_MEMORY = N_NORMAL_MEMORY, | |
399 | #endif | |
20b2f52b | 400 | N_MEMORY, /* The node has memory(regular, high, movable) */ |
37c0708d | 401 | N_CPU, /* The node has one or more cpus */ |
894c26a1 | 402 | N_GENERIC_INITIATOR, /* The node has one or more Generic Initiators */ |
13808910 CL |
403 | NR_NODE_STATES |
404 | }; | |
405 | ||
1da177e4 LT |
406 | /* |
407 | * The following particular system nodemasks and operations | |
408 | * on them manage all possible and online nodes. | |
409 | */ | |
410 | ||
13808910 | 411 | extern nodemask_t node_states[NR_NODE_STATES]; |
1da177e4 LT |
412 | |
413 | #if MAX_NUMNODES > 1 | |
13808910 CL |
414 | static inline int node_state(int node, enum node_states state) |
415 | { | |
416 | return node_isset(node, node_states[state]); | |
417 | } | |
418 | ||
419 | static inline void node_set_state(int node, enum node_states state) | |
420 | { | |
421 | __node_set(node, &node_states[state]); | |
422 | } | |
423 | ||
424 | static inline void node_clear_state(int node, enum node_states state) | |
425 | { | |
426 | __node_clear(node, &node_states[state]); | |
427 | } | |
428 | ||
429 | static inline int num_node_state(enum node_states state) | |
430 | { | |
431 | return nodes_weight(node_states[state]); | |
432 | } | |
433 | ||
434 | #define for_each_node_state(__node, __state) \ | |
435 | for_each_node_mask((__node), node_states[__state]) | |
436 | ||
437 | #define first_online_node first_node(node_states[N_ONLINE]) | |
8d060bf4 DR |
438 | #define first_memory_node first_node(node_states[N_MEMORY]) |
439 | static inline int next_online_node(int nid) | |
440 | { | |
441 | return next_node(nid, node_states[N_ONLINE]); | |
442 | } | |
443 | static inline int next_memory_node(int nid) | |
444 | { | |
445 | return next_node(nid, node_states[N_MEMORY]); | |
446 | } | |
13808910 | 447 | |
b9726c26 | 448 | extern unsigned int nr_node_ids; |
ce0725f7 | 449 | extern unsigned int nr_online_nodes; |
62bc62a8 CL |
450 | |
451 | static inline void node_set_online(int nid) | |
452 | { | |
453 | node_set_state(nid, N_ONLINE); | |
454 | nr_online_nodes = num_node_state(N_ONLINE); | |
455 | } | |
456 | ||
457 | static inline void node_set_offline(int nid) | |
458 | { | |
459 | node_clear_state(nid, N_ONLINE); | |
460 | nr_online_nodes = num_node_state(N_ONLINE); | |
461 | } | |
778d3b0f | 462 | |
1da177e4 | 463 | #else |
13808910 CL |
464 | |
465 | static inline int node_state(int node, enum node_states state) | |
466 | { | |
467 | return node == 0; | |
468 | } | |
469 | ||
470 | static inline void node_set_state(int node, enum node_states state) | |
471 | { | |
472 | } | |
473 | ||
474 | static inline void node_clear_state(int node, enum node_states state) | |
475 | { | |
476 | } | |
477 | ||
478 | static inline int num_node_state(enum node_states state) | |
479 | { | |
480 | return 1; | |
481 | } | |
482 | ||
483 | #define for_each_node_state(node, __state) \ | |
484 | for ( (node) = 0; (node) == 0; (node) = 1) | |
485 | ||
8357f869 | 486 | #define first_online_node 0 |
8d060bf4 | 487 | #define first_memory_node 0 |
8357f869 | 488 | #define next_online_node(nid) (MAX_NUMNODES) |
b9726c26 | 489 | #define nr_node_ids 1U |
ce0725f7 | 490 | #define nr_online_nodes 1U |
13808910 | 491 | |
62bc62a8 CL |
492 | #define node_set_online(node) node_set_state((node), N_ONLINE) |
493 | #define node_set_offline(node) node_clear_state((node), N_ONLINE) | |
778d3b0f MH |
494 | |
495 | #endif | |
496 | ||
497 | #if defined(CONFIG_NUMA) && (MAX_NUMNODES > 1) | |
498 | extern int node_random(const nodemask_t *maskp); | |
499 | #else | |
500 | static inline int node_random(const nodemask_t *mask) | |
501 | { | |
502 | return 0; | |
503 | } | |
1da177e4 LT |
504 | #endif |
505 | ||
13808910 CL |
506 | #define node_online_map node_states[N_ONLINE] |
507 | #define node_possible_map node_states[N_POSSIBLE] | |
508 | ||
13808910 CL |
509 | #define num_online_nodes() num_node_state(N_ONLINE) |
510 | #define num_possible_nodes() num_node_state(N_POSSIBLE) | |
511 | #define node_online(node) node_state((node), N_ONLINE) | |
512 | #define node_possible(node) node_state((node), N_POSSIBLE) | |
513 | ||
13808910 CL |
514 | #define for_each_node(node) for_each_node_state(node, N_POSSIBLE) |
515 | #define for_each_online_node(node) for_each_node_state(node, N_ONLINE) | |
1da177e4 | 516 | |
4bfc4495 | 517 | /* |
c23c8082 | 518 | * For nodemask scratch area. |
bad44b5b DR |
519 | * NODEMASK_ALLOC(type, name) allocates an object with a specified type and |
520 | * name. | |
4bfc4495 | 521 | */ |
5df66d30 | 522 | #if NODES_SHIFT > 8 /* nodemask_t > 32 bytes */ |
bad44b5b DR |
523 | #define NODEMASK_ALLOC(type, name, gfp_flags) \ |
524 | type *name = kmalloc(sizeof(*name), gfp_flags) | |
525 | #define NODEMASK_FREE(m) kfree(m) | |
4bfc4495 | 526 | #else |
7baab93f | 527 | #define NODEMASK_ALLOC(type, name, gfp_flags) type _##name, *name = &_##name |
bad44b5b | 528 | #define NODEMASK_FREE(m) do {} while (0) |
4bfc4495 KH |
529 | #endif |
530 | ||
c23c8082 | 531 | /* Example structure for using NODEMASK_ALLOC, used in mempolicy. */ |
4bfc4495 KH |
532 | struct nodemask_scratch { |
533 | nodemask_t mask1; | |
534 | nodemask_t mask2; | |
535 | }; | |
536 | ||
bad44b5b DR |
537 | #define NODEMASK_SCRATCH(x) \ |
538 | NODEMASK_ALLOC(struct nodemask_scratch, x, \ | |
539 | GFP_KERNEL | __GFP_NORETRY) | |
4e7b8a6c | 540 | #define NODEMASK_SCRATCH_FREE(x) NODEMASK_FREE(x) |
4bfc4495 KH |
541 | |
542 | ||
1da177e4 | 543 | #endif /* __LINUX_NODEMASK_H */ |