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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#include <linux/bug.h>
13
14typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
15
16/**
17 * cpumask_bits - get the bits in a cpumask
18 * @maskp: the struct cpumask *
19 *
20 * You should only assume nr_cpu_ids bits of this mask are valid. This is
21 * a macro so it's const-correct.
22 */
23#define cpumask_bits(maskp) ((maskp)->bits)
24
25#if NR_CPUS == 1
26#define nr_cpu_ids 1
27#else
28extern int nr_cpu_ids;
29#endif
30
31#ifdef CONFIG_CPUMASK_OFFSTACK
32/* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
33 * not all bits may be allocated. */
34#define nr_cpumask_bits nr_cpu_ids
35#else
36#define nr_cpumask_bits NR_CPUS
37#endif
38
39/*
40 * The following particular system cpumasks and operations manage
41 * possible, present, active and online cpus.
42 *
43 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
44 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
45 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
46 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
47 *
48 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
49 *
50 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
51 * that it is possible might ever be plugged in at anytime during the
52 * life of that system boot. The cpu_present_mask is dynamic(*),
53 * representing which CPUs are currently plugged in. And
54 * cpu_online_mask is the dynamic subset of cpu_present_mask,
55 * indicating those CPUs available for scheduling.
56 *
57 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
58 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
59 * ACPI reports present at boot.
60 *
61 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
62 * depending on what ACPI reports as currently plugged in, otherwise
63 * cpu_present_mask is just a copy of cpu_possible_mask.
64 *
65 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
66 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
67 *
68 * Subtleties:
69 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
70 * assumption that their single CPU is online. The UP
71 * cpu_{online,possible,present}_masks are placebos. Changing them
72 * will have no useful affect on the following num_*_cpus()
73 * and cpu_*() macros in the UP case. This ugliness is a UP
74 * optimization - don't waste any instructions or memory references
75 * asking if you're online or how many CPUs there are if there is
76 * only one CPU.
77 */
78
79extern const struct cpumask *const cpu_possible_mask;
80extern const struct cpumask *const cpu_online_mask;
81extern const struct cpumask *const cpu_present_mask;
82extern const struct cpumask *const cpu_active_mask;
83
84#if NR_CPUS > 1
85#define num_online_cpus() cpumask_weight(cpu_online_mask)
86#define num_possible_cpus() cpumask_weight(cpu_possible_mask)
87#define num_present_cpus() cpumask_weight(cpu_present_mask)
88#define num_active_cpus() cpumask_weight(cpu_active_mask)
89#define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
90#define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
91#define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
92#define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
93#else
94#define num_online_cpus() 1U
95#define num_possible_cpus() 1U
96#define num_present_cpus() 1U
97#define num_active_cpus() 1U
98#define cpu_online(cpu) ((cpu) == 0)
99#define cpu_possible(cpu) ((cpu) == 0)
100#define cpu_present(cpu) ((cpu) == 0)
101#define cpu_active(cpu) ((cpu) == 0)
102#endif
103
104/* verify cpu argument to cpumask_* operators */
105static inline unsigned int cpumask_check(unsigned int cpu)
106{
107#ifdef CONFIG_DEBUG_PER_CPU_MAPS
108 WARN_ON_ONCE(cpu >= nr_cpumask_bits);
109#endif /* CONFIG_DEBUG_PER_CPU_MAPS */
110 return cpu;
111}
112
113#if NR_CPUS == 1
114/* Uniprocessor. Assume all masks are "1". */
115static inline unsigned int cpumask_first(const struct cpumask *srcp)
116{
117 return 0;
118}
119
120/* Valid inputs for n are -1 and 0. */
121static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
122{
123 return n+1;
124}
125
126static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
127{
128 return n+1;
129}
130
131static inline unsigned int cpumask_next_and(int n,
132 const struct cpumask *srcp,
133 const struct cpumask *andp)
134{
135 return n+1;
136}
137
138/* cpu must be a valid cpu, ie 0, so there's no other choice. */
139static inline unsigned int cpumask_any_but(const struct cpumask *mask,
140 unsigned int cpu)
141{
142 return 1;
143}
144
145#define for_each_cpu(cpu, mask) \
146 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
147#define for_each_cpu_not(cpu, mask) \
148 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
149#define for_each_cpu_and(cpu, mask, and) \
150 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
151#else
152/**
153 * cpumask_first - get the first cpu in a cpumask
154 * @srcp: the cpumask pointer
155 *
156 * Returns >= nr_cpu_ids if no cpus set.
157 */
158static inline unsigned int cpumask_first(const struct cpumask *srcp)
159{
160 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
161}
162
163/**
164 * cpumask_next - get the next cpu in a cpumask
165 * @n: the cpu prior to the place to search (ie. return will be > @n)
166 * @srcp: the cpumask pointer
167 *
168 * Returns >= nr_cpu_ids if no further cpus set.
169 */
170static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
171{
172 /* -1 is a legal arg here. */
173 if (n != -1)
174 cpumask_check(n);
175 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
176}
177
178/**
179 * cpumask_next_zero - get the next unset cpu in a cpumask
180 * @n: the cpu prior to the place to search (ie. return will be > @n)
181 * @srcp: the cpumask pointer
182 *
183 * Returns >= nr_cpu_ids if no further cpus unset.
184 */
185static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
186{
187 /* -1 is a legal arg here. */
188 if (n != -1)
189 cpumask_check(n);
190 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
191}
192
193int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
194int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
195
196/**
197 * for_each_cpu - iterate over every cpu in a mask
198 * @cpu: the (optionally unsigned) integer iterator
199 * @mask: the cpumask pointer
200 *
201 * After the loop, cpu is >= nr_cpu_ids.
202 */
203#define for_each_cpu(cpu, mask) \
204 for ((cpu) = -1; \
205 (cpu) = cpumask_next((cpu), (mask)), \
206 (cpu) < nr_cpu_ids;)
207
208/**
209 * for_each_cpu_not - iterate over every cpu in a complemented mask
210 * @cpu: the (optionally unsigned) integer iterator
211 * @mask: the cpumask pointer
212 *
213 * After the loop, cpu is >= nr_cpu_ids.
214 */
215#define for_each_cpu_not(cpu, mask) \
216 for ((cpu) = -1; \
217 (cpu) = cpumask_next_zero((cpu), (mask)), \
218 (cpu) < nr_cpu_ids;)
219
220/**
221 * for_each_cpu_and - iterate over every cpu in both masks
222 * @cpu: the (optionally unsigned) integer iterator
223 * @mask: the first cpumask pointer
224 * @and: the second cpumask pointer
225 *
226 * This saves a temporary CPU mask in many places. It is equivalent to:
227 * struct cpumask tmp;
228 * cpumask_and(&tmp, &mask, &and);
229 * for_each_cpu(cpu, &tmp)
230 * ...
231 *
232 * After the loop, cpu is >= nr_cpu_ids.
233 */
234#define for_each_cpu_and(cpu, mask, and) \
235 for ((cpu) = -1; \
236 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
237 (cpu) < nr_cpu_ids;)
238#endif /* SMP */
239
240#define CPU_BITS_NONE \
241{ \
242 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
243}
244
245#define CPU_BITS_CPU0 \
246{ \
247 [0] = 1UL \
248}
249
250/**
251 * cpumask_set_cpu - set a cpu in a cpumask
252 * @cpu: cpu number (< nr_cpu_ids)
253 * @dstp: the cpumask pointer
254 */
255static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
256{
257 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
258}
259
260/**
261 * cpumask_clear_cpu - clear a cpu in a cpumask
262 * @cpu: cpu number (< nr_cpu_ids)
263 * @dstp: the cpumask pointer
264 */
265static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
266{
267 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
268}
269
270/**
271 * cpumask_test_cpu - test for a cpu in a cpumask
272 * @cpu: cpu number (< nr_cpu_ids)
273 * @cpumask: the cpumask pointer
274 *
275 * Returns 1 if @cpu is set in @cpumask, else returns 0
276 *
277 * No static inline type checking - see Subtlety (1) above.
278 */
279#define cpumask_test_cpu(cpu, cpumask) \
280 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
281
282/**
283 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
284 * @cpu: cpu number (< nr_cpu_ids)
285 * @cpumask: the cpumask pointer
286 *
287 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
288 *
289 * test_and_set_bit wrapper for cpumasks.
290 */
291static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
292{
293 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
294}
295
296/**
297 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
298 * @cpu: cpu number (< nr_cpu_ids)
299 * @cpumask: the cpumask pointer
300 *
301 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
302 *
303 * test_and_clear_bit wrapper for cpumasks.
304 */
305static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
306{
307 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
308}
309
310/**
311 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
312 * @dstp: the cpumask pointer
313 */
314static inline void cpumask_setall(struct cpumask *dstp)
315{
316 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
317}
318
319/**
320 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
321 * @dstp: the cpumask pointer
322 */
323static inline void cpumask_clear(struct cpumask *dstp)
324{
325 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
326}
327
328/**
329 * cpumask_and - *dstp = *src1p & *src2p
330 * @dstp: the cpumask result
331 * @src1p: the first input
332 * @src2p: the second input
333 *
334 * If *@dstp is empty, returns 0, else returns 1
335 */
336static inline int cpumask_and(struct cpumask *dstp,
337 const struct cpumask *src1p,
338 const struct cpumask *src2p)
339{
340 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
341 cpumask_bits(src2p), nr_cpumask_bits);
342}
343
344/**
345 * cpumask_or - *dstp = *src1p | *src2p
346 * @dstp: the cpumask result
347 * @src1p: the first input
348 * @src2p: the second input
349 */
350static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
351 const struct cpumask *src2p)
352{
353 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
354 cpumask_bits(src2p), nr_cpumask_bits);
355}
356
357/**
358 * cpumask_xor - *dstp = *src1p ^ *src2p
359 * @dstp: the cpumask result
360 * @src1p: the first input
361 * @src2p: the second input
362 */
363static inline void cpumask_xor(struct cpumask *dstp,
364 const struct cpumask *src1p,
365 const struct cpumask *src2p)
366{
367 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
368 cpumask_bits(src2p), nr_cpumask_bits);
369}
370
371/**
372 * cpumask_andnot - *dstp = *src1p & ~*src2p
373 * @dstp: the cpumask result
374 * @src1p: the first input
375 * @src2p: the second input
376 *
377 * If *@dstp is empty, returns 0, else returns 1
378 */
379static inline int cpumask_andnot(struct cpumask *dstp,
380 const struct cpumask *src1p,
381 const struct cpumask *src2p)
382{
383 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
384 cpumask_bits(src2p), nr_cpumask_bits);
385}
386
387/**
388 * cpumask_complement - *dstp = ~*srcp
389 * @dstp: the cpumask result
390 * @srcp: the input to invert
391 */
392static inline void cpumask_complement(struct cpumask *dstp,
393 const struct cpumask *srcp)
394{
395 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
396 nr_cpumask_bits);
397}
398
399/**
400 * cpumask_equal - *src1p == *src2p
401 * @src1p: the first input
402 * @src2p: the second input
403 */
404static inline bool cpumask_equal(const struct cpumask *src1p,
405 const struct cpumask *src2p)
406{
407 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
408 nr_cpumask_bits);
409}
410
411/**
412 * cpumask_intersects - (*src1p & *src2p) != 0
413 * @src1p: the first input
414 * @src2p: the second input
415 */
416static inline bool cpumask_intersects(const struct cpumask *src1p,
417 const struct cpumask *src2p)
418{
419 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
420 nr_cpumask_bits);
421}
422
423/**
424 * cpumask_subset - (*src1p & ~*src2p) == 0
425 * @src1p: the first input
426 * @src2p: the second input
427 *
428 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
429 */
430static inline int cpumask_subset(const struct cpumask *src1p,
431 const struct cpumask *src2p)
432{
433 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
434 nr_cpumask_bits);
435}
436
437/**
438 * cpumask_empty - *srcp == 0
439 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
440 */
441static inline bool cpumask_empty(const struct cpumask *srcp)
442{
443 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
444}
445
446/**
447 * cpumask_full - *srcp == 0xFFFFFFFF...
448 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
449 */
450static inline bool cpumask_full(const struct cpumask *srcp)
451{
452 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
453}
454
455/**
456 * cpumask_weight - Count of bits in *srcp
457 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
458 */
459static inline unsigned int cpumask_weight(const struct cpumask *srcp)
460{
461 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
462}
463
464/**
465 * cpumask_shift_right - *dstp = *srcp >> n
466 * @dstp: the cpumask result
467 * @srcp: the input to shift
468 * @n: the number of bits to shift by
469 */
470static inline void cpumask_shift_right(struct cpumask *dstp,
471 const struct cpumask *srcp, int n)
472{
473 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
474 nr_cpumask_bits);
475}
476
477/**
478 * cpumask_shift_left - *dstp = *srcp << n
479 * @dstp: the cpumask result
480 * @srcp: the input to shift
481 * @n: the number of bits to shift by
482 */
483static inline void cpumask_shift_left(struct cpumask *dstp,
484 const struct cpumask *srcp, int n)
485{
486 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
487 nr_cpumask_bits);
488}
489
490/**
491 * cpumask_copy - *dstp = *srcp
492 * @dstp: the result
493 * @srcp: the input cpumask
494 */
495static inline void cpumask_copy(struct cpumask *dstp,
496 const struct cpumask *srcp)
497{
498 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
499}
500
501/**
502 * cpumask_any - pick a "random" cpu from *srcp
503 * @srcp: the input cpumask
504 *
505 * Returns >= nr_cpu_ids if no cpus set.
506 */
507#define cpumask_any(srcp) cpumask_first(srcp)
508
509/**
510 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
511 * @src1p: the first input
512 * @src2p: the second input
513 *
514 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
515 */
516#define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
517
518/**
519 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
520 * @mask1: the first input cpumask
521 * @mask2: the second input cpumask
522 *
523 * Returns >= nr_cpu_ids if no cpus set.
524 */
525#define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
526
527/**
528 * cpumask_of - the cpumask containing just a given cpu
529 * @cpu: the cpu (<= nr_cpu_ids)
530 */
531#define cpumask_of(cpu) (get_cpu_mask(cpu))
532
533/**
534 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
535 * @buf: the buffer to sprintf into
536 * @len: the length of the buffer
537 * @srcp: the cpumask to print
538 *
539 * If len is zero, returns zero. Otherwise returns the length of the
540 * (nul-terminated) @buf string.
541 */
542static inline int cpumask_scnprintf(char *buf, int len,
543 const struct cpumask *srcp)
544{
545 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
546}
547
548/**
549 * cpumask_parse_user - extract a cpumask from a user string
550 * @buf: the buffer to extract from
551 * @len: the length of the buffer
552 * @dstp: the cpumask to set.
553 *
554 * Returns -errno, or 0 for success.
555 */
556static inline int cpumask_parse_user(const char __user *buf, int len,
557 struct cpumask *dstp)
558{
559 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
560}
561
562/**
563 * cpumask_parselist_user - extract a cpumask from a user string
564 * @buf: the buffer to extract from
565 * @len: the length of the buffer
566 * @dstp: the cpumask to set.
567 *
568 * Returns -errno, or 0 for success.
569 */
570static inline int cpumask_parselist_user(const char __user *buf, int len,
571 struct cpumask *dstp)
572{
573 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
574 nr_cpumask_bits);
575}
576
577/**
578 * cpulist_scnprintf - print a cpumask into a string as comma-separated list
579 * @buf: the buffer to sprintf into
580 * @len: the length of the buffer
581 * @srcp: the cpumask to print
582 *
583 * If len is zero, returns zero. Otherwise returns the length of the
584 * (nul-terminated) @buf string.
585 */
586static inline int cpulist_scnprintf(char *buf, int len,
587 const struct cpumask *srcp)
588{
589 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
590 nr_cpumask_bits);
591}
592
593/**
594 * cpumask_parse - extract a cpumask from from a string
595 * @buf: the buffer to extract from
596 * @dstp: the cpumask to set.
597 *
598 * Returns -errno, or 0 for success.
599 */
600static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
601{
602 char *nl = strchr(buf, '\n');
603 int len = nl ? nl - buf : strlen(buf);
604
605 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
606}
607
608/**
609 * cpulist_parse - extract a cpumask from a user string of ranges
610 * @buf: the buffer to extract from
611 * @dstp: the cpumask to set.
612 *
613 * Returns -errno, or 0 for success.
614 */
615static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
616{
617 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
618}
619
620/**
621 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
622 *
623 * This will eventually be a runtime variable, depending on nr_cpu_ids.
624 */
625static inline size_t cpumask_size(void)
626{
627 /* FIXME: Once all cpumask assignments are eliminated, this
628 * can be nr_cpumask_bits */
629 return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
630}
631
632/*
633 * cpumask_var_t: struct cpumask for stack usage.
634 *
635 * Oh, the wicked games we play! In order to make kernel coding a
636 * little more difficult, we typedef cpumask_var_t to an array or a
637 * pointer: doing &mask on an array is a noop, so it still works.
638 *
639 * ie.
640 * cpumask_var_t tmpmask;
641 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
642 * return -ENOMEM;
643 *
644 * ... use 'tmpmask' like a normal struct cpumask * ...
645 *
646 * free_cpumask_var(tmpmask);
647 *
648 *
649 * However, one notable exception is there. alloc_cpumask_var() allocates
650 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
651 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
652 *
653 * cpumask_var_t tmpmask;
654 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
655 * return -ENOMEM;
656 *
657 * var = *tmpmask;
658 *
659 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
660 * cpumask_copy() provide safe copy functionality.
661 */
662#ifdef CONFIG_CPUMASK_OFFSTACK
663typedef struct cpumask *cpumask_var_t;
664
665bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
666bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
667bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
668bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
669void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
670void free_cpumask_var(cpumask_var_t mask);
671void free_bootmem_cpumask_var(cpumask_var_t mask);
672
673#else
674typedef struct cpumask cpumask_var_t[1];
675
676static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
677{
678 return true;
679}
680
681static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
682 int node)
683{
684 return true;
685}
686
687static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
688{
689 cpumask_clear(*mask);
690 return true;
691}
692
693static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
694 int node)
695{
696 cpumask_clear(*mask);
697 return true;
698}
699
700static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
701{
702}
703
704static inline void free_cpumask_var(cpumask_var_t mask)
705{
706}
707
708static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
709{
710}
711#endif /* CONFIG_CPUMASK_OFFSTACK */
712
713/* It's common to want to use cpu_all_mask in struct member initializers,
714 * so it has to refer to an address rather than a pointer. */
715extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
716#define cpu_all_mask to_cpumask(cpu_all_bits)
717
718/* First bits of cpu_bit_bitmap are in fact unset. */
719#define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
720
721#define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
722#define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
723#define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
724
725/* Wrappers for arch boot code to manipulate normally-constant masks */
726void set_cpu_possible(unsigned int cpu, bool possible);
727void set_cpu_present(unsigned int cpu, bool present);
728void set_cpu_online(unsigned int cpu, bool online);
729void set_cpu_active(unsigned int cpu, bool active);
730void init_cpu_present(const struct cpumask *src);
731void init_cpu_possible(const struct cpumask *src);
732void init_cpu_online(const struct cpumask *src);
733
734/**
735 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
736 * @bitmap: the bitmap
737 *
738 * There are a few places where cpumask_var_t isn't appropriate and
739 * static cpumasks must be used (eg. very early boot), yet we don't
740 * expose the definition of 'struct cpumask'.
741 *
742 * This does the conversion, and can be used as a constant initializer.
743 */
744#define to_cpumask(bitmap) \
745 ((struct cpumask *)(1 ? (bitmap) \
746 : (void *)sizeof(__check_is_bitmap(bitmap))))
747
748static inline int __check_is_bitmap(const unsigned long *bitmap)
749{
750 return 1;
751}
752
753/*
754 * Special-case data structure for "single bit set only" constant CPU masks.
755 *
756 * We pre-generate all the 64 (or 32) possible bit positions, with enough
757 * padding to the left and the right, and return the constant pointer
758 * appropriately offset.
759 */
760extern const unsigned long
761 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
762
763static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
764{
765 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
766 p -= cpu / BITS_PER_LONG;
767 return to_cpumask(p);
768}
769
770#define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
771
772#if NR_CPUS <= BITS_PER_LONG
773#define CPU_BITS_ALL \
774{ \
775 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
776}
777
778#else /* NR_CPUS > BITS_PER_LONG */
779
780#define CPU_BITS_ALL \
781{ \
782 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
783 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
784}
785#endif /* NR_CPUS > BITS_PER_LONG */
786
787/*
788 *
789 * From here down, all obsolete. Use cpumask_ variants!
790 *
791 */
792#ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
793#define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
794
795#define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
796
797#if NR_CPUS <= BITS_PER_LONG
798
799#define CPU_MASK_ALL \
800(cpumask_t) { { \
801 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
802} }
803
804#else
805
806#define CPU_MASK_ALL \
807(cpumask_t) { { \
808 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
809 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
810} }
811
812#endif
813
814#define CPU_MASK_NONE \
815(cpumask_t) { { \
816 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
817} }
818
819#define CPU_MASK_CPU0 \
820(cpumask_t) { { \
821 [0] = 1UL \
822} }
823
824#if NR_CPUS == 1
825#define first_cpu(src) ({ (void)(src); 0; })
826#define next_cpu(n, src) ({ (void)(src); 1; })
827#define any_online_cpu(mask) 0
828#define for_each_cpu_mask(cpu, mask) \
829 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
830#else /* NR_CPUS > 1 */
831int __first_cpu(const cpumask_t *srcp);
832int __next_cpu(int n, const cpumask_t *srcp);
833
834#define first_cpu(src) __first_cpu(&(src))
835#define next_cpu(n, src) __next_cpu((n), &(src))
836#define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask)
837#define for_each_cpu_mask(cpu, mask) \
838 for ((cpu) = -1; \
839 (cpu) = next_cpu((cpu), (mask)), \
840 (cpu) < NR_CPUS; )
841#endif /* SMP */
842
843#if NR_CPUS <= 64
844
845#define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
846
847#else /* NR_CPUS > 64 */
848
849int __next_cpu_nr(int n, const cpumask_t *srcp);
850#define for_each_cpu_mask_nr(cpu, mask) \
851 for ((cpu) = -1; \
852 (cpu) = __next_cpu_nr((cpu), &(mask)), \
853 (cpu) < nr_cpu_ids; )
854
855#endif /* NR_CPUS > 64 */
856
857#define cpus_addr(src) ((src).bits)
858
859#define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
860static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
861{
862 set_bit(cpu, dstp->bits);
863}
864
865#define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
866static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
867{
868 clear_bit(cpu, dstp->bits);
869}
870
871#define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
872static inline void __cpus_setall(cpumask_t *dstp, int nbits)
873{
874 bitmap_fill(dstp->bits, nbits);
875}
876
877#define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
878static inline void __cpus_clear(cpumask_t *dstp, int nbits)
879{
880 bitmap_zero(dstp->bits, nbits);
881}
882
883/* No static inline type checking - see Subtlety (1) above. */
884#define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
885
886#define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
887static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
888{
889 return test_and_set_bit(cpu, addr->bits);
890}
891
892#define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
893static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
894 const cpumask_t *src2p, int nbits)
895{
896 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
897}
898
899#define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
900static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
901 const cpumask_t *src2p, int nbits)
902{
903 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
904}
905
906#define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
907static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
908 const cpumask_t *src2p, int nbits)
909{
910 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
911}
912
913#define cpus_andnot(dst, src1, src2) \
914 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
915static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
916 const cpumask_t *src2p, int nbits)
917{
918 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
919}
920
921#define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
922static inline int __cpus_equal(const cpumask_t *src1p,
923 const cpumask_t *src2p, int nbits)
924{
925 return bitmap_equal(src1p->bits, src2p->bits, nbits);
926}
927
928#define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
929static inline int __cpus_intersects(const cpumask_t *src1p,
930 const cpumask_t *src2p, int nbits)
931{
932 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
933}
934
935#define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
936static inline int __cpus_subset(const cpumask_t *src1p,
937 const cpumask_t *src2p, int nbits)
938{
939 return bitmap_subset(src1p->bits, src2p->bits, nbits);
940}
941
942#define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
943static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
944{
945 return bitmap_empty(srcp->bits, nbits);
946}
947
948#define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
949static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
950{
951 return bitmap_weight(srcp->bits, nbits);
952}
953
954#define cpus_shift_left(dst, src, n) \
955 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
956static inline void __cpus_shift_left(cpumask_t *dstp,
957 const cpumask_t *srcp, int n, int nbits)
958{
959 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
960}
961#endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
962
963#endif /* __LINUX_CPUMASK_H */