Line data Source code
1 : #ifndef __LINUX_CPUMASK_H
2 : #define __LINUX_CPUMASK_H
3 :
4 : /*
5 : * Cpumasks provide a bitmap suitable for representing the
6 : * set of CPU's in a system, one bit position per CPU number. In general,
7 : * only nr_cpu_ids (<= NR_CPUS) bits are valid.
8 : */
9 : #include <linux/kernel.h>
10 : #include <linux/threads.h>
11 : #include <linux/bitmap.h>
12 :
13 1 : typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
14 :
15 : /**
16 : * cpumask_bits - get the bits in a cpumask
17 : * @maskp: the struct cpumask *
18 : *
19 : * You should only assume nr_cpu_ids bits of this mask are valid. This is
20 : * a macro so it's const-correct.
21 : */
22 : #define cpumask_bits(maskp) ((maskp)->bits)
23 :
24 : #if NR_CPUS == 1
25 : #define nr_cpu_ids 1
26 : #else
27 : extern int nr_cpu_ids;
28 : #endif
29 :
30 : #ifdef CONFIG_CPUMASK_OFFSTACK
31 : /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
32 : * not all bits may be allocated. */
33 : #define nr_cpumask_bits nr_cpu_ids
34 : #else
35 : #define nr_cpumask_bits NR_CPUS
36 : #endif
37 :
38 : /*
39 : * The following particular system cpumasks and operations manage
40 : * possible, present, active and online cpus.
41 : *
42 : * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
43 : * cpu_present_mask - has bit 'cpu' set iff cpu is populated
44 : * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
45 : * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
46 : *
47 : * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
48 : *
49 : * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
50 : * that it is possible might ever be plugged in at anytime during the
51 : * life of that system boot. The cpu_present_mask is dynamic(*),
52 : * representing which CPUs are currently plugged in. And
53 : * cpu_online_mask is the dynamic subset of cpu_present_mask,
54 : * indicating those CPUs available for scheduling.
55 : *
56 : * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
57 : * all NR_CPUS bits set, otherwise it is just the set of CPUs that
58 : * ACPI reports present at boot.
59 : *
60 : * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
61 : * depending on what ACPI reports as currently plugged in, otherwise
62 : * cpu_present_mask is just a copy of cpu_possible_mask.
63 : *
64 : * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
65 : * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
66 : *
67 : * Subtleties:
68 : * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
69 : * assumption that their single CPU is online. The UP
70 : * cpu_{online,possible,present}_masks are placebos. Changing them
71 : * will have no useful affect on the following num_*_cpus()
72 : * and cpu_*() macros in the UP case. This ugliness is a UP
73 : * optimization - don't waste any instructions or memory references
74 : * asking if you're online or how many CPUs there are if there is
75 : * only one CPU.
76 : */
77 :
78 : extern const struct cpumask *const cpu_possible_mask;
79 : extern const struct cpumask *const cpu_online_mask;
80 : extern const struct cpumask *const cpu_present_mask;
81 : extern const struct cpumask *const cpu_active_mask;
82 :
83 : #if NR_CPUS > 1
84 : #define num_online_cpus() cpumask_weight(cpu_online_mask)
85 : #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
86 : #define num_present_cpus() cpumask_weight(cpu_present_mask)
87 : #define num_active_cpus() cpumask_weight(cpu_active_mask)
88 : #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
89 : #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
90 : #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
91 : #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
92 : #else
93 : #define num_online_cpus() 1
94 : #define num_possible_cpus() 1
95 : #define num_present_cpus() 1
96 : #define num_active_cpus() 1
97 : #define cpu_online(cpu) ((cpu) == 0)
98 : #define cpu_possible(cpu) ((cpu) == 0)
99 : #define cpu_present(cpu) ((cpu) == 0)
100 : #define cpu_active(cpu) ((cpu) == 0)
101 : #endif
102 :
103 : /* verify cpu argument to cpumask_* operators */
104 : static inline unsigned int cpumask_check(unsigned int cpu)
105 : {
106 : #ifdef CONFIG_DEBUG_PER_CPU_MAPS
107 : WARN_ON_ONCE(cpu >= nr_cpumask_bits);
108 : #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
109 : return cpu;
110 : }
111 :
112 : #if NR_CPUS == 1
113 : /* Uniprocessor. Assume all masks are "1". */
114 : static inline unsigned int cpumask_first(const struct cpumask *srcp)
115 : {
116 : return 0;
117 : }
118 :
119 : /* Valid inputs for n are -1 and 0. */
120 : static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
121 : {
122 : return n+1;
123 : }
124 :
125 : static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
126 : {
127 : return n+1;
128 : }
129 :
130 : static inline unsigned int cpumask_next_and(int n,
131 : const struct cpumask *srcp,
132 : const struct cpumask *andp)
133 : {
134 : return n+1;
135 : }
136 :
137 : /* cpu must be a valid cpu, ie 0, so there's no other choice. */
138 : static inline unsigned int cpumask_any_but(const struct cpumask *mask,
139 : unsigned int cpu)
140 : {
141 : return 1;
142 : }
143 :
144 : #define for_each_cpu(cpu, mask) \
145 : for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
146 : #define for_each_cpu_and(cpu, mask, and) \
147 : for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
148 : #else
149 : /**
150 : * cpumask_first - get the first cpu in a cpumask
151 : * @srcp: the cpumask pointer
152 : *
153 : * Returns >= nr_cpu_ids if no cpus set.
154 : */
155 : static inline unsigned int cpumask_first(const struct cpumask *srcp)
156 : {
157 : return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
158 : }
159 :
160 : /**
161 : * cpumask_next - get the next cpu in a cpumask
162 : * @n: the cpu prior to the place to search (ie. return will be > @n)
163 : * @srcp: the cpumask pointer
164 : *
165 : * Returns >= nr_cpu_ids if no further cpus set.
166 : */
167 : static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
168 : {
169 : /* -1 is a legal arg here. */
170 : if (n != -1)
171 : cpumask_check(n);
172 : return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
173 : }
174 :
175 : /**
176 : * cpumask_next_zero - get the next unset cpu in a cpumask
177 : * @n: the cpu prior to the place to search (ie. return will be > @n)
178 : * @srcp: the cpumask pointer
179 : *
180 : * Returns >= nr_cpu_ids if no further cpus unset.
181 : */
182 : static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
183 : {
184 : /* -1 is a legal arg here. */
185 : if (n != -1)
186 : cpumask_check(n);
187 : return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
188 : }
189 :
190 : int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
191 : int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
192 :
193 : /**
194 : * for_each_cpu - iterate over every cpu in a mask
195 : * @cpu: the (optionally unsigned) integer iterator
196 : * @mask: the cpumask pointer
197 : *
198 : * After the loop, cpu is >= nr_cpu_ids.
199 : */
200 : #define for_each_cpu(cpu, mask) \
201 : for ((cpu) = -1; \
202 : (cpu) = cpumask_next((cpu), (mask)), \
203 : (cpu) < nr_cpu_ids;)
204 :
205 : /**
206 : * for_each_cpu_and - iterate over every cpu in both masks
207 : * @cpu: the (optionally unsigned) integer iterator
208 : * @mask: the first cpumask pointer
209 : * @and: the second cpumask pointer
210 : *
211 : * This saves a temporary CPU mask in many places. It is equivalent to:
212 : * struct cpumask tmp;
213 : * cpumask_and(&tmp, &mask, &and);
214 : * for_each_cpu(cpu, &tmp)
215 : * ...
216 : *
217 : * After the loop, cpu is >= nr_cpu_ids.
218 : */
219 : #define for_each_cpu_and(cpu, mask, and) \
220 : for ((cpu) = -1; \
221 : (cpu) = cpumask_next_and((cpu), (mask), (and)), \
222 : (cpu) < nr_cpu_ids;)
223 : #endif /* SMP */
224 :
225 : #define CPU_BITS_NONE \
226 : { \
227 : [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
228 : }
229 :
230 : #define CPU_BITS_CPU0 \
231 : { \
232 : [0] = 1UL \
233 : }
234 :
235 : /**
236 : * cpumask_set_cpu - set a cpu in a cpumask
237 : * @cpu: cpu number (< nr_cpu_ids)
238 : * @dstp: the cpumask pointer
239 : */
240 : static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
241 : {
242 : set_bit(cpumask_check(cpu), cpumask_bits(dstp));
243 : }
244 :
245 : /**
246 : * cpumask_clear_cpu - clear a cpu in a cpumask
247 : * @cpu: cpu number (< nr_cpu_ids)
248 : * @dstp: the cpumask pointer
249 : */
250 : static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
251 : {
252 : clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
253 : }
254 :
255 : /**
256 : * cpumask_test_cpu - test for a cpu in a cpumask
257 : * @cpu: cpu number (< nr_cpu_ids)
258 : * @cpumask: the cpumask pointer
259 : *
260 : * No static inline type checking - see Subtlety (1) above.
261 : */
262 : #define cpumask_test_cpu(cpu, cpumask) \
263 : test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
264 :
265 : /**
266 : * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
267 : * @cpu: cpu number (< nr_cpu_ids)
268 : * @cpumask: the cpumask pointer
269 : *
270 : * test_and_set_bit wrapper for cpumasks.
271 : */
272 : static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
273 : {
274 : return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
275 : }
276 :
277 : /**
278 : * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
279 : * @cpu: cpu number (< nr_cpu_ids)
280 : * @cpumask: the cpumask pointer
281 : *
282 : * test_and_clear_bit wrapper for cpumasks.
283 : */
284 : static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
285 : {
286 : return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
287 : }
288 :
289 : /**
290 : * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
291 : * @dstp: the cpumask pointer
292 : */
293 : static inline void cpumask_setall(struct cpumask *dstp)
294 : {
295 : bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
296 : }
297 :
298 : /**
299 : * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
300 : * @dstp: the cpumask pointer
301 : */
302 : static inline void cpumask_clear(struct cpumask *dstp)
303 : {
304 : bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
305 : }
306 :
307 : /**
308 : * cpumask_and - *dstp = *src1p & *src2p
309 : * @dstp: the cpumask result
310 : * @src1p: the first input
311 : * @src2p: the second input
312 : */
313 : static inline int cpumask_and(struct cpumask *dstp,
314 : const struct cpumask *src1p,
315 : const struct cpumask *src2p)
316 : {
317 : return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
318 : cpumask_bits(src2p), nr_cpumask_bits);
319 : }
320 :
321 : /**
322 : * cpumask_or - *dstp = *src1p | *src2p
323 : * @dstp: the cpumask result
324 : * @src1p: the first input
325 : * @src2p: the second input
326 : */
327 : static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
328 : const struct cpumask *src2p)
329 : {
330 : bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
331 : cpumask_bits(src2p), nr_cpumask_bits);
332 : }
333 :
334 : /**
335 : * cpumask_xor - *dstp = *src1p ^ *src2p
336 : * @dstp: the cpumask result
337 : * @src1p: the first input
338 : * @src2p: the second input
339 : */
340 : static inline void cpumask_xor(struct cpumask *dstp,
341 : const struct cpumask *src1p,
342 : const struct cpumask *src2p)
343 : {
344 : bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
345 : cpumask_bits(src2p), nr_cpumask_bits);
346 : }
347 :
348 : /**
349 : * cpumask_andnot - *dstp = *src1p & ~*src2p
350 : * @dstp: the cpumask result
351 : * @src1p: the first input
352 : * @src2p: the second input
353 : */
354 : static inline int cpumask_andnot(struct cpumask *dstp,
355 : const struct cpumask *src1p,
356 : const struct cpumask *src2p)
357 : {
358 : return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
359 : cpumask_bits(src2p), nr_cpumask_bits);
360 : }
361 :
362 : /**
363 : * cpumask_complement - *dstp = ~*srcp
364 : * @dstp: the cpumask result
365 : * @srcp: the input to invert
366 : */
367 : static inline void cpumask_complement(struct cpumask *dstp,
368 : const struct cpumask *srcp)
369 : {
370 : bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
371 : nr_cpumask_bits);
372 : }
373 :
374 : /**
375 : * cpumask_equal - *src1p == *src2p
376 : * @src1p: the first input
377 : * @src2p: the second input
378 : */
379 : static inline bool cpumask_equal(const struct cpumask *src1p,
380 : const struct cpumask *src2p)
381 : {
382 : return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
383 : nr_cpumask_bits);
384 : }
385 :
386 : /**
387 : * cpumask_intersects - (*src1p & *src2p) != 0
388 : * @src1p: the first input
389 : * @src2p: the second input
390 : */
391 : static inline bool cpumask_intersects(const struct cpumask *src1p,
392 : const struct cpumask *src2p)
393 : {
394 : return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
395 : nr_cpumask_bits);
396 : }
397 :
398 : /**
399 : * cpumask_subset - (*src1p & ~*src2p) == 0
400 : * @src1p: the first input
401 : * @src2p: the second input
402 : */
403 : static inline int cpumask_subset(const struct cpumask *src1p,
404 : const struct cpumask *src2p)
405 : {
406 : return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
407 : nr_cpumask_bits);
408 : }
409 :
410 : /**
411 : * cpumask_empty - *srcp == 0
412 : * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
413 : */
414 : static inline bool cpumask_empty(const struct cpumask *srcp)
415 : {
416 : return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
417 : }
418 :
419 : /**
420 : * cpumask_full - *srcp == 0xFFFFFFFF...
421 : * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
422 : */
423 : static inline bool cpumask_full(const struct cpumask *srcp)
424 : {
425 : return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
426 : }
427 :
428 : /**
429 : * cpumask_weight - Count of bits in *srcp
430 : * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
431 : */
432 : static inline unsigned int cpumask_weight(const struct cpumask *srcp)
433 : {
434 : return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
435 : }
436 :
437 : /**
438 : * cpumask_shift_right - *dstp = *srcp >> n
439 : * @dstp: the cpumask result
440 : * @srcp: the input to shift
441 : * @n: the number of bits to shift by
442 : */
443 : static inline void cpumask_shift_right(struct cpumask *dstp,
444 : const struct cpumask *srcp, int n)
445 : {
446 : bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
447 : nr_cpumask_bits);
448 : }
449 :
450 : /**
451 : * cpumask_shift_left - *dstp = *srcp << n
452 : * @dstp: the cpumask result
453 : * @srcp: the input to shift
454 : * @n: the number of bits to shift by
455 : */
456 : static inline void cpumask_shift_left(struct cpumask *dstp,
457 : const struct cpumask *srcp, int n)
458 : {
459 : bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
460 : nr_cpumask_bits);
461 : }
462 :
463 : /**
464 : * cpumask_copy - *dstp = *srcp
465 : * @dstp: the result
466 : * @srcp: the input cpumask
467 : */
468 : static inline void cpumask_copy(struct cpumask *dstp,
469 : const struct cpumask *srcp)
470 : {
471 : bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
472 : }
473 :
474 : /**
475 : * cpumask_any - pick a "random" cpu from *srcp
476 : * @srcp: the input cpumask
477 : *
478 : * Returns >= nr_cpu_ids if no cpus set.
479 : */
480 : #define cpumask_any(srcp) cpumask_first(srcp)
481 :
482 : /**
483 : * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
484 : * @src1p: the first input
485 : * @src2p: the second input
486 : *
487 : * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
488 : */
489 : #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
490 :
491 : /**
492 : * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
493 : * @mask1: the first input cpumask
494 : * @mask2: the second input cpumask
495 : *
496 : * Returns >= nr_cpu_ids if no cpus set.
497 : */
498 : #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
499 :
500 : /**
501 : * cpumask_of - the cpumask containing just a given cpu
502 : * @cpu: the cpu (<= nr_cpu_ids)
503 : */
504 : #define cpumask_of(cpu) (get_cpu_mask(cpu))
505 :
506 : /**
507 : * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
508 : * @buf: the buffer to sprintf into
509 : * @len: the length of the buffer
510 : * @srcp: the cpumask to print
511 : *
512 : * If len is zero, returns zero. Otherwise returns the length of the
513 : * (nul-terminated) @buf string.
514 : */
515 : static inline int cpumask_scnprintf(char *buf, int len,
516 : const struct cpumask *srcp)
517 : {
518 : return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
519 : }
520 :
521 : /**
522 : * cpumask_parse_user - extract a cpumask from a user string
523 : * @buf: the buffer to extract from
524 : * @len: the length of the buffer
525 : * @dstp: the cpumask to set.
526 : *
527 : * Returns -errno, or 0 for success.
528 : */
529 : static inline int cpumask_parse_user(const char __user *buf, int len,
530 : struct cpumask *dstp)
531 : {
532 : return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
533 : }
534 :
535 : /**
536 : * cpulist_scnprintf - print a cpumask into a string as comma-separated list
537 : * @buf: the buffer to sprintf into
538 : * @len: the length of the buffer
539 : * @srcp: the cpumask to print
540 : *
541 : * If len is zero, returns zero. Otherwise returns the length of the
542 : * (nul-terminated) @buf string.
543 : */
544 : static inline int cpulist_scnprintf(char *buf, int len,
545 : const struct cpumask *srcp)
546 : {
547 : return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
548 : nr_cpumask_bits);
549 : }
550 :
551 : /**
552 : * cpulist_parse_user - extract a cpumask from a user string of ranges
553 : * @buf: the buffer to extract from
554 : * @len: the length of the buffer
555 : * @dstp: the cpumask to set.
556 : *
557 : * Returns -errno, or 0 for success.
558 : */
559 : static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
560 : {
561 : return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
562 : }
563 :
564 : /**
565 : * cpumask_size - size to allocate for a 'struct cpumask' in bytes
566 : *
567 : * This will eventually be a runtime variable, depending on nr_cpu_ids.
568 : */
569 : static inline size_t cpumask_size(void)
570 : {
571 : /* FIXME: Once all cpumask assignments are eliminated, this
572 : * can be nr_cpumask_bits */
573 : return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
574 : }
575 :
576 : /*
577 : * cpumask_var_t: struct cpumask for stack usage.
578 : *
579 : * Oh, the wicked games we play! In order to make kernel coding a
580 : * little more difficult, we typedef cpumask_var_t to an array or a
581 : * pointer: doing &mask on an array is a noop, so it still works.
582 : *
583 : * ie.
584 : * cpumask_var_t tmpmask;
585 : * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
586 : * return -ENOMEM;
587 : *
588 : * ... use 'tmpmask' like a normal struct cpumask * ...
589 : *
590 : * free_cpumask_var(tmpmask);
591 : */
592 : #ifdef CONFIG_CPUMASK_OFFSTACK
593 : typedef struct cpumask *cpumask_var_t;
594 :
595 : bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
596 : bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
597 : bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
598 : bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
599 : void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
600 : void free_cpumask_var(cpumask_var_t mask);
601 : void free_bootmem_cpumask_var(cpumask_var_t mask);
602 :
603 : #else
604 : typedef struct cpumask cpumask_var_t[1];
605 :
606 : static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
607 : {
608 : return true;
609 : }
610 :
611 : static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
612 : int node)
613 : {
614 : return true;
615 : }
616 :
617 : static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
618 : {
619 : cpumask_clear(*mask);
620 : return true;
621 : }
622 :
623 : static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
624 : int node)
625 : {
626 : cpumask_clear(*mask);
627 : return true;
628 : }
629 :
630 : static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
631 : {
632 : }
633 :
634 : static inline void free_cpumask_var(cpumask_var_t mask)
635 : {
636 : }
637 :
638 : static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
639 : {
640 : }
641 : #endif /* CONFIG_CPUMASK_OFFSTACK */
642 :
643 : /* It's common to want to use cpu_all_mask in struct member initializers,
644 : * so it has to refer to an address rather than a pointer. */
645 : extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
646 : #define cpu_all_mask to_cpumask(cpu_all_bits)
647 :
648 : /* First bits of cpu_bit_bitmap are in fact unset. */
649 : #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
650 :
651 : #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
652 : #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
653 : #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
654 :
655 : /* Wrappers for arch boot code to manipulate normally-constant masks */
656 : void set_cpu_possible(unsigned int cpu, bool possible);
657 : void set_cpu_present(unsigned int cpu, bool present);
658 : void set_cpu_online(unsigned int cpu, bool online);
659 : void set_cpu_active(unsigned int cpu, bool active);
660 : void init_cpu_present(const struct cpumask *src);
661 : void init_cpu_possible(const struct cpumask *src);
662 : void init_cpu_online(const struct cpumask *src);
663 :
664 : /**
665 : * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
666 : * @bitmap: the bitmap
667 : *
668 : * There are a few places where cpumask_var_t isn't appropriate and
669 : * static cpumasks must be used (eg. very early boot), yet we don't
670 : * expose the definition of 'struct cpumask'.
671 : *
672 : * This does the conversion, and can be used as a constant initializer.
673 : */
674 : #define to_cpumask(bitmap) \
675 : ((struct cpumask *)(1 ? (bitmap) \
676 : : (void *)sizeof(__check_is_bitmap(bitmap))))
677 :
678 : static inline int __check_is_bitmap(const unsigned long *bitmap)
679 : {
680 : return 1;
681 : }
682 :
683 : /*
684 : * Special-case data structure for "single bit set only" constant CPU masks.
685 : *
686 : * We pre-generate all the 64 (or 32) possible bit positions, with enough
687 : * padding to the left and the right, and return the constant pointer
688 : * appropriately offset.
689 : */
690 : extern const unsigned long
691 : cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
692 :
693 : static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
694 : {
695 : const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
696 : p -= cpu / BITS_PER_LONG;
697 : return to_cpumask(p);
698 : }
699 :
700 : #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
701 :
702 : #if NR_CPUS <= BITS_PER_LONG
703 : #define CPU_BITS_ALL \
704 : { \
705 : [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
706 : }
707 :
708 : #else /* NR_CPUS > BITS_PER_LONG */
709 :
710 : #define CPU_BITS_ALL \
711 : { \
712 : [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
713 : [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
714 : }
715 : #endif /* NR_CPUS > BITS_PER_LONG */
716 :
717 : /*
718 : *
719 : * From here down, all obsolete. Use cpumask_ variants!
720 : *
721 : */
722 : #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
723 : /* These strip const, as traditionally they weren't const. */
724 : #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
725 : #define cpu_online_map (*(cpumask_t *)cpu_online_mask)
726 : #define cpu_present_map (*(cpumask_t *)cpu_present_mask)
727 : #define cpu_active_map (*(cpumask_t *)cpu_active_mask)
728 :
729 : #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
730 :
731 : #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
732 :
733 : #if NR_CPUS <= BITS_PER_LONG
734 :
735 : #define CPU_MASK_ALL \
736 : (cpumask_t) { { \
737 : [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
738 : } }
739 :
740 : #else
741 :
742 : #define CPU_MASK_ALL \
743 : (cpumask_t) { { \
744 : [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
745 : [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
746 : } }
747 :
748 : #endif
749 :
750 : #define CPU_MASK_NONE \
751 : (cpumask_t) { { \
752 : [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
753 : } }
754 :
755 : #define CPU_MASK_CPU0 \
756 : (cpumask_t) { { \
757 : [0] = 1UL \
758 : } }
759 :
760 : #if NR_CPUS == 1
761 : #define first_cpu(src) ({ (void)(src); 0; })
762 : #define next_cpu(n, src) ({ (void)(src); 1; })
763 : #define any_online_cpu(mask) 0
764 : #define for_each_cpu_mask(cpu, mask) \
765 : for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
766 : #else /* NR_CPUS > 1 */
767 : int __first_cpu(const cpumask_t *srcp);
768 : int __next_cpu(int n, const cpumask_t *srcp);
769 : int __any_online_cpu(const cpumask_t *mask);
770 :
771 : #define first_cpu(src) __first_cpu(&(src))
772 : #define next_cpu(n, src) __next_cpu((n), &(src))
773 : #define any_online_cpu(mask) __any_online_cpu(&(mask))
774 : #define for_each_cpu_mask(cpu, mask) \
775 : for ((cpu) = -1; \
776 : (cpu) = next_cpu((cpu), (mask)), \
777 : (cpu) < NR_CPUS; )
778 : #endif /* SMP */
779 :
780 : #if NR_CPUS <= 64
781 :
782 : #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
783 :
784 : #else /* NR_CPUS > 64 */
785 :
786 : int __next_cpu_nr(int n, const cpumask_t *srcp);
787 : #define for_each_cpu_mask_nr(cpu, mask) \
788 : for ((cpu) = -1; \
789 : (cpu) = __next_cpu_nr((cpu), &(mask)), \
790 : (cpu) < nr_cpu_ids; )
791 :
792 : #endif /* NR_CPUS > 64 */
793 :
794 : #define cpus_addr(src) ((src).bits)
795 :
796 : #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
797 : static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
798 : {
799 : set_bit(cpu, dstp->bits);
800 : }
801 :
802 : #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
803 : static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
804 : {
805 : clear_bit(cpu, dstp->bits);
806 : }
807 :
808 : #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
809 : static inline void __cpus_setall(cpumask_t *dstp, int nbits)
810 : {
811 : bitmap_fill(dstp->bits, nbits);
812 : }
813 :
814 : #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
815 : static inline void __cpus_clear(cpumask_t *dstp, int nbits)
816 : {
817 : bitmap_zero(dstp->bits, nbits);
818 : }
819 :
820 : /* No static inline type checking - see Subtlety (1) above. */
821 : #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
822 :
823 : #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
824 : static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
825 : {
826 : return test_and_set_bit(cpu, addr->bits);
827 : }
828 :
829 : #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
830 : static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
831 : const cpumask_t *src2p, int nbits)
832 : {
833 : return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
834 : }
835 :
836 : #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
837 : static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
838 : const cpumask_t *src2p, int nbits)
839 : {
840 : bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
841 : }
842 :
843 : #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
844 : static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
845 : const cpumask_t *src2p, int nbits)
846 : {
847 : bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
848 : }
849 :
850 : #define cpus_andnot(dst, src1, src2) \
851 : __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
852 : static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
853 : const cpumask_t *src2p, int nbits)
854 : {
855 : return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
856 : }
857 :
858 : #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
859 : static inline int __cpus_equal(const cpumask_t *src1p,
860 : const cpumask_t *src2p, int nbits)
861 : {
862 : return bitmap_equal(src1p->bits, src2p->bits, nbits);
863 : }
864 :
865 : #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
866 : static inline int __cpus_intersects(const cpumask_t *src1p,
867 : const cpumask_t *src2p, int nbits)
868 : {
869 : return bitmap_intersects(src1p->bits, src2p->bits, nbits);
870 : }
871 :
872 : #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
873 : static inline int __cpus_subset(const cpumask_t *src1p,
874 : const cpumask_t *src2p, int nbits)
875 : {
876 : return bitmap_subset(src1p->bits, src2p->bits, nbits);
877 : }
878 :
879 : #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
880 : static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
881 : {
882 : return bitmap_empty(srcp->bits, nbits);
883 : }
884 :
885 : #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
886 : static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
887 : {
888 : return bitmap_weight(srcp->bits, nbits);
889 : }
890 :
891 : #define cpus_shift_left(dst, src, n) \
892 : __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
893 : static inline void __cpus_shift_left(cpumask_t *dstp,
894 : const cpumask_t *srcp, int n, int nbits)
895 : {
896 : bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
897 : }
898 : #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
899 :
900 : #endif /* __LINUX_CPUMASK_H */
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