1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __LINUX_CPUMASK_H
3 #define __LINUX_CPUMASK_H
6 * Cpumasks provide a bitmap suitable for representing the
7 * set of CPU's in a system, one bit position per CPU number. In general,
8 * only nr_cpu_ids (<= NR_CPUS) bits are valid.
10 #include <linux/kernel.h>
11 #include <linux/threads.h>
12 #include <linux/bitmap.h>
13 #include <linux/atomic.h>
14 #include <linux/bug.h>
16 /* Don't assign or return these: may not be this big! */
17 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
20 * cpumask_bits - get the bits in a cpumask
21 * @maskp: the struct cpumask *
23 * You should only assume nr_cpu_ids bits of this mask are valid. This is
24 * a macro so it's const-correct.
26 #define cpumask_bits(maskp) ((maskp)->bits)
29 * cpumask_pr_args - printf args to output a cpumask
30 * @maskp: cpumask to be printed
32 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
34 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
39 extern unsigned int nr_cpu_ids;
42 #ifdef CONFIG_CPUMASK_OFFSTACK
43 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
44 * not all bits may be allocated. */
45 #define nr_cpumask_bits nr_cpu_ids
47 #define nr_cpumask_bits ((unsigned int)NR_CPUS)
51 * The following particular system cpumasks and operations manage
52 * possible, present, active and online cpus.
54 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
55 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
56 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
57 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
59 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
61 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
62 * that it is possible might ever be plugged in at anytime during the
63 * life of that system boot. The cpu_present_mask is dynamic(*),
64 * representing which CPUs are currently plugged in. And
65 * cpu_online_mask is the dynamic subset of cpu_present_mask,
66 * indicating those CPUs available for scheduling.
68 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
69 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
70 * ACPI reports present at boot.
72 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
73 * depending on what ACPI reports as currently plugged in, otherwise
74 * cpu_present_mask is just a copy of cpu_possible_mask.
76 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
77 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
80 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
81 * assumption that their single CPU is online. The UP
82 * cpu_{online,possible,present}_masks are placebos. Changing them
83 * will have no useful affect on the following num_*_cpus()
84 * and cpu_*() macros in the UP case. This ugliness is a UP
85 * optimization - don't waste any instructions or memory references
86 * asking if you're online or how many CPUs there are if there is
90 extern struct cpumask __cpu_possible_mask;
91 extern struct cpumask __cpu_online_mask;
92 extern struct cpumask __cpu_present_mask;
93 extern struct cpumask __cpu_active_mask;
94 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
95 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
96 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
97 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
99 extern atomic_t __num_online_cpus;
103 * num_online_cpus() - Read the number of online CPUs
105 * Despite the fact that __num_online_cpus is of type atomic_t, this
106 * interface gives only a momentary snapshot and is not protected against
107 * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
110 static inline unsigned int num_online_cpus(void)
112 return atomic_read(&__num_online_cpus);
114 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
115 #define num_present_cpus() cpumask_weight(cpu_present_mask)
116 #define num_active_cpus() cpumask_weight(cpu_active_mask)
117 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
118 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
119 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
120 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
122 #define num_online_cpus() 1U
123 #define num_possible_cpus() 1U
124 #define num_present_cpus() 1U
125 #define num_active_cpus() 1U
126 #define cpu_online(cpu) ((cpu) == 0)
127 #define cpu_possible(cpu) ((cpu) == 0)
128 #define cpu_present(cpu) ((cpu) == 0)
129 #define cpu_active(cpu) ((cpu) == 0)
132 extern cpumask_t cpus_booted_once_mask;
134 static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
136 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
137 WARN_ON_ONCE(cpu >= bits);
138 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
141 /* verify cpu argument to cpumask_* operators */
142 static inline unsigned int cpumask_check(unsigned int cpu)
144 cpu_max_bits_warn(cpu, nr_cpumask_bits);
149 /* Uniprocessor. Assume all masks are "1". */
150 static inline unsigned int cpumask_first(const struct cpumask *srcp)
155 static inline unsigned int cpumask_last(const struct cpumask *srcp)
160 /* Valid inputs for n are -1 and 0. */
161 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
166 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
171 static inline unsigned int cpumask_next_and(int n,
172 const struct cpumask *srcp,
173 const struct cpumask *andp)
178 static inline unsigned int cpumask_next_wrap(int n, const struct cpumask *mask,
179 int start, bool wrap)
181 /* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
182 return (wrap && n == 0);
185 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
186 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
192 static inline unsigned int cpumask_local_spread(unsigned int i, int node)
197 static inline int cpumask_any_and_distribute(const struct cpumask *src1p,
198 const struct cpumask *src2p) {
199 return cpumask_next_and(-1, src1p, src2p);
202 static inline int cpumask_any_distribute(const struct cpumask *srcp)
204 return cpumask_first(srcp);
207 #define for_each_cpu(cpu, mask) \
208 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
209 #define for_each_cpu_not(cpu, mask) \
210 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
211 #define for_each_cpu_wrap(cpu, mask, start) \
212 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
213 #define for_each_cpu_and(cpu, mask1, mask2) \
214 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
217 * cpumask_first - get the first cpu in a cpumask
218 * @srcp: the cpumask pointer
220 * Returns >= nr_cpu_ids if no cpus set.
222 static inline unsigned int cpumask_first(const struct cpumask *srcp)
224 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
228 * cpumask_last - get the last CPU in a cpumask
229 * @srcp: - the cpumask pointer
231 * Returns >= nr_cpumask_bits if no CPUs set.
233 static inline unsigned int cpumask_last(const struct cpumask *srcp)
235 return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
238 unsigned int cpumask_next(int n, const struct cpumask *srcp);
241 * cpumask_next_zero - get the next unset cpu in a cpumask
242 * @n: the cpu prior to the place to search (ie. return will be > @n)
243 * @srcp: the cpumask pointer
245 * Returns >= nr_cpu_ids if no further cpus unset.
247 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
249 /* -1 is a legal arg here. */
252 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
255 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
256 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
257 unsigned int cpumask_local_spread(unsigned int i, int node);
258 int cpumask_any_and_distribute(const struct cpumask *src1p,
259 const struct cpumask *src2p);
260 int cpumask_any_distribute(const struct cpumask *srcp);
263 * for_each_cpu - iterate over every cpu in a mask
264 * @cpu: the (optionally unsigned) integer iterator
265 * @mask: the cpumask pointer
267 * After the loop, cpu is >= nr_cpu_ids.
269 #define for_each_cpu(cpu, mask) \
271 (cpu) = cpumask_next((cpu), (mask)), \
275 * for_each_cpu_not - iterate over every cpu in a complemented mask
276 * @cpu: the (optionally unsigned) integer iterator
277 * @mask: the cpumask pointer
279 * After the loop, cpu is >= nr_cpu_ids.
281 #define for_each_cpu_not(cpu, mask) \
283 (cpu) = cpumask_next_zero((cpu), (mask)), \
286 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
289 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
290 * @cpu: the (optionally unsigned) integer iterator
291 * @mask: the cpumask poiter
292 * @start: the start location
294 * The implementation does not assume any bit in @mask is set (including @start).
296 * After the loop, cpu is >= nr_cpu_ids.
298 #define for_each_cpu_wrap(cpu, mask, start) \
299 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
300 (cpu) < nr_cpumask_bits; \
301 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
304 * for_each_cpu_and - iterate over every cpu in both masks
305 * @cpu: the (optionally unsigned) integer iterator
306 * @mask1: the first cpumask pointer
307 * @mask2: the second cpumask pointer
309 * This saves a temporary CPU mask in many places. It is equivalent to:
310 * struct cpumask tmp;
311 * cpumask_and(&tmp, &mask1, &mask2);
312 * for_each_cpu(cpu, &tmp)
315 * After the loop, cpu is >= nr_cpu_ids.
317 #define for_each_cpu_and(cpu, mask1, mask2) \
319 (cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
323 #define CPU_BITS_NONE \
325 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
328 #define CPU_BITS_CPU0 \
334 * cpumask_set_cpu - set a cpu in a cpumask
335 * @cpu: cpu number (< nr_cpu_ids)
336 * @dstp: the cpumask pointer
338 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
340 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
343 static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
345 __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
350 * cpumask_clear_cpu - clear a cpu in a cpumask
351 * @cpu: cpu number (< nr_cpu_ids)
352 * @dstp: the cpumask pointer
354 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
356 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
359 static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
361 __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
365 * cpumask_test_cpu - test for a cpu in a cpumask
366 * @cpu: cpu number (< nr_cpu_ids)
367 * @cpumask: the cpumask pointer
369 * Returns 1 if @cpu is set in @cpumask, else returns 0
371 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
373 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
377 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
378 * @cpu: cpu number (< nr_cpu_ids)
379 * @cpumask: the cpumask pointer
381 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
383 * test_and_set_bit wrapper for cpumasks.
385 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
387 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
391 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
392 * @cpu: cpu number (< nr_cpu_ids)
393 * @cpumask: the cpumask pointer
395 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
397 * test_and_clear_bit wrapper for cpumasks.
399 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
401 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
405 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
406 * @dstp: the cpumask pointer
408 static inline void cpumask_setall(struct cpumask *dstp)
410 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
414 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
415 * @dstp: the cpumask pointer
417 static inline void cpumask_clear(struct cpumask *dstp)
419 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
423 * cpumask_and - *dstp = *src1p & *src2p
424 * @dstp: the cpumask result
425 * @src1p: the first input
426 * @src2p: the second input
428 * If *@dstp is empty, returns 0, else returns 1
430 static inline int cpumask_and(struct cpumask *dstp,
431 const struct cpumask *src1p,
432 const struct cpumask *src2p)
434 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
435 cpumask_bits(src2p), nr_cpumask_bits);
439 * cpumask_or - *dstp = *src1p | *src2p
440 * @dstp: the cpumask result
441 * @src1p: the first input
442 * @src2p: the second input
444 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
445 const struct cpumask *src2p)
447 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
448 cpumask_bits(src2p), nr_cpumask_bits);
452 * cpumask_xor - *dstp = *src1p ^ *src2p
453 * @dstp: the cpumask result
454 * @src1p: the first input
455 * @src2p: the second input
457 static inline void cpumask_xor(struct cpumask *dstp,
458 const struct cpumask *src1p,
459 const struct cpumask *src2p)
461 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
462 cpumask_bits(src2p), nr_cpumask_bits);
466 * cpumask_andnot - *dstp = *src1p & ~*src2p
467 * @dstp: the cpumask result
468 * @src1p: the first input
469 * @src2p: the second input
471 * If *@dstp is empty, returns 0, else returns 1
473 static inline int cpumask_andnot(struct cpumask *dstp,
474 const struct cpumask *src1p,
475 const struct cpumask *src2p)
477 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
478 cpumask_bits(src2p), nr_cpumask_bits);
482 * cpumask_complement - *dstp = ~*srcp
483 * @dstp: the cpumask result
484 * @srcp: the input to invert
486 static inline void cpumask_complement(struct cpumask *dstp,
487 const struct cpumask *srcp)
489 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
494 * cpumask_equal - *src1p == *src2p
495 * @src1p: the first input
496 * @src2p: the second input
498 static inline bool cpumask_equal(const struct cpumask *src1p,
499 const struct cpumask *src2p)
501 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
506 * cpumask_or_equal - *src1p | *src2p == *src3p
507 * @src1p: the first input
508 * @src2p: the second input
509 * @src3p: the third input
511 static inline bool cpumask_or_equal(const struct cpumask *src1p,
512 const struct cpumask *src2p,
513 const struct cpumask *src3p)
515 return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p),
516 cpumask_bits(src3p), nr_cpumask_bits);
520 * cpumask_intersects - (*src1p & *src2p) != 0
521 * @src1p: the first input
522 * @src2p: the second input
524 static inline bool cpumask_intersects(const struct cpumask *src1p,
525 const struct cpumask *src2p)
527 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
532 * cpumask_subset - (*src1p & ~*src2p) == 0
533 * @src1p: the first input
534 * @src2p: the second input
536 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
538 static inline int cpumask_subset(const struct cpumask *src1p,
539 const struct cpumask *src2p)
541 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
546 * cpumask_empty - *srcp == 0
547 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
549 static inline bool cpumask_empty(const struct cpumask *srcp)
551 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
555 * cpumask_full - *srcp == 0xFFFFFFFF...
556 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
558 static inline bool cpumask_full(const struct cpumask *srcp)
560 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
564 * cpumask_weight - Count of bits in *srcp
565 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
567 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
569 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
573 * cpumask_shift_right - *dstp = *srcp >> n
574 * @dstp: the cpumask result
575 * @srcp: the input to shift
576 * @n: the number of bits to shift by
578 static inline void cpumask_shift_right(struct cpumask *dstp,
579 const struct cpumask *srcp, int n)
581 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
586 * cpumask_shift_left - *dstp = *srcp << n
587 * @dstp: the cpumask result
588 * @srcp: the input to shift
589 * @n: the number of bits to shift by
591 static inline void cpumask_shift_left(struct cpumask *dstp,
592 const struct cpumask *srcp, int n)
594 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
599 * cpumask_copy - *dstp = *srcp
601 * @srcp: the input cpumask
603 static inline void cpumask_copy(struct cpumask *dstp,
604 const struct cpumask *srcp)
606 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
610 * cpumask_any - pick a "random" cpu from *srcp
611 * @srcp: the input cpumask
613 * Returns >= nr_cpu_ids if no cpus set.
615 #define cpumask_any(srcp) cpumask_first(srcp)
618 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
619 * @src1p: the first input
620 * @src2p: the second input
622 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
624 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
627 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
628 * @mask1: the first input cpumask
629 * @mask2: the second input cpumask
631 * Returns >= nr_cpu_ids if no cpus set.
633 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
636 * cpumask_of - the cpumask containing just a given cpu
637 * @cpu: the cpu (<= nr_cpu_ids)
639 #define cpumask_of(cpu) (get_cpu_mask(cpu))
642 * cpumask_parse_user - extract a cpumask from a user string
643 * @buf: the buffer to extract from
644 * @len: the length of the buffer
645 * @dstp: the cpumask to set.
647 * Returns -errno, or 0 for success.
649 static inline int cpumask_parse_user(const char __user *buf, int len,
650 struct cpumask *dstp)
652 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
656 * cpumask_parselist_user - extract a cpumask from a user string
657 * @buf: the buffer to extract from
658 * @len: the length of the buffer
659 * @dstp: the cpumask to set.
661 * Returns -errno, or 0 for success.
663 static inline int cpumask_parselist_user(const char __user *buf, int len,
664 struct cpumask *dstp)
666 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
671 * cpumask_parse - extract a cpumask from a string
672 * @buf: the buffer to extract from
673 * @dstp: the cpumask to set.
675 * Returns -errno, or 0 for success.
677 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
679 return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits);
683 * cpulist_parse - extract a cpumask from a user string of ranges
684 * @buf: the buffer to extract from
685 * @dstp: the cpumask to set.
687 * Returns -errno, or 0 for success.
689 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
691 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
695 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
697 static inline unsigned int cpumask_size(void)
699 return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
703 * cpumask_var_t: struct cpumask for stack usage.
705 * Oh, the wicked games we play! In order to make kernel coding a
706 * little more difficult, we typedef cpumask_var_t to an array or a
707 * pointer: doing &mask on an array is a noop, so it still works.
710 * cpumask_var_t tmpmask;
711 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
714 * ... use 'tmpmask' like a normal struct cpumask * ...
716 * free_cpumask_var(tmpmask);
719 * However, one notable exception is there. alloc_cpumask_var() allocates
720 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
721 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
723 * cpumask_var_t tmpmask;
724 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
729 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
730 * cpumask_copy() provide safe copy functionality.
732 * Note that there is another evil here: If you define a cpumask_var_t
733 * as a percpu variable then the way to obtain the address of the cpumask
734 * structure differently influences what this_cpu_* operation needs to be
735 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
736 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
737 * other type of cpumask_var_t implementation is configured.
739 * Please also note that __cpumask_var_read_mostly can be used to declare
740 * a cpumask_var_t variable itself (not its content) as read mostly.
742 #ifdef CONFIG_CPUMASK_OFFSTACK
743 typedef struct cpumask *cpumask_var_t;
745 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
746 #define __cpumask_var_read_mostly __read_mostly
748 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
749 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
750 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
751 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
752 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
753 void free_cpumask_var(cpumask_var_t mask);
754 void free_bootmem_cpumask_var(cpumask_var_t mask);
756 static inline bool cpumask_available(cpumask_var_t mask)
762 typedef struct cpumask cpumask_var_t[1];
764 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
765 #define __cpumask_var_read_mostly
767 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
772 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
778 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
780 cpumask_clear(*mask);
784 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
787 cpumask_clear(*mask);
791 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
795 static inline void free_cpumask_var(cpumask_var_t mask)
799 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
803 static inline bool cpumask_available(cpumask_var_t mask)
807 #endif /* CONFIG_CPUMASK_OFFSTACK */
809 /* It's common to want to use cpu_all_mask in struct member initializers,
810 * so it has to refer to an address rather than a pointer. */
811 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
812 #define cpu_all_mask to_cpumask(cpu_all_bits)
814 /* First bits of cpu_bit_bitmap are in fact unset. */
815 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
817 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
818 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
819 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
821 /* Wrappers for arch boot code to manipulate normally-constant masks */
822 void init_cpu_present(const struct cpumask *src);
823 void init_cpu_possible(const struct cpumask *src);
824 void init_cpu_online(const struct cpumask *src);
826 static inline void reset_cpu_possible_mask(void)
828 bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
832 set_cpu_possible(unsigned int cpu, bool possible)
835 cpumask_set_cpu(cpu, &__cpu_possible_mask);
837 cpumask_clear_cpu(cpu, &__cpu_possible_mask);
841 set_cpu_present(unsigned int cpu, bool present)
844 cpumask_set_cpu(cpu, &__cpu_present_mask);
846 cpumask_clear_cpu(cpu, &__cpu_present_mask);
849 void set_cpu_online(unsigned int cpu, bool online);
852 set_cpu_active(unsigned int cpu, bool active)
855 cpumask_set_cpu(cpu, &__cpu_active_mask);
857 cpumask_clear_cpu(cpu, &__cpu_active_mask);
862 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
863 * @bitmap: the bitmap
865 * There are a few places where cpumask_var_t isn't appropriate and
866 * static cpumasks must be used (eg. very early boot), yet we don't
867 * expose the definition of 'struct cpumask'.
869 * This does the conversion, and can be used as a constant initializer.
871 #define to_cpumask(bitmap) \
872 ((struct cpumask *)(1 ? (bitmap) \
873 : (void *)sizeof(__check_is_bitmap(bitmap))))
875 static inline int __check_is_bitmap(const unsigned long *bitmap)
881 * Special-case data structure for "single bit set only" constant CPU masks.
883 * We pre-generate all the 64 (or 32) possible bit positions, with enough
884 * padding to the left and the right, and return the constant pointer
885 * appropriately offset.
887 extern const unsigned long
888 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
890 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
892 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
893 p -= cpu / BITS_PER_LONG;
894 return to_cpumask(p);
897 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
899 #if NR_CPUS <= BITS_PER_LONG
900 #define CPU_BITS_ALL \
902 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
905 #else /* NR_CPUS > BITS_PER_LONG */
907 #define CPU_BITS_ALL \
909 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
910 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
912 #endif /* NR_CPUS > BITS_PER_LONG */
915 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
916 * as comma-separated list of cpus or hex values of cpumask
917 * @list: indicates whether the cpumap must be list
918 * @mask: the cpumask to copy
919 * @buf: the buffer to copy into
921 * Returns the length of the (null-terminated) @buf string, zero if
924 static inline ssize_t
925 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
927 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
931 #if NR_CPUS <= BITS_PER_LONG
932 #define CPU_MASK_ALL \
934 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
937 #define CPU_MASK_ALL \
939 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
940 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
942 #endif /* NR_CPUS > BITS_PER_LONG */
944 #define CPU_MASK_NONE \
946 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
949 #define CPU_MASK_CPU0 \
954 #endif /* __LINUX_CPUMASK_H */