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/bug.h>
15 /* Don't assign or return these: may not be this big! */
16 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
19 * cpumask_bits - get the bits in a cpumask
20 * @maskp: the struct cpumask *
22 * You should only assume nr_cpu_ids bits of this mask are valid. This is
23 * a macro so it's const-correct.
25 #define cpumask_bits(maskp) ((maskp)->bits)
28 * cpumask_pr_args - printf args to output a cpumask
29 * @maskp: cpumask to be printed
31 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
33 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
38 extern unsigned int nr_cpu_ids;
41 #ifdef CONFIG_CPUMASK_OFFSTACK
42 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
43 * not all bits may be allocated. */
44 #define nr_cpumask_bits nr_cpu_ids
46 #define nr_cpumask_bits ((unsigned int)NR_CPUS)
50 * The following particular system cpumasks and operations manage
51 * possible, present, active and online cpus.
53 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
54 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
55 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
56 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
58 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
60 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
61 * that it is possible might ever be plugged in at anytime during the
62 * life of that system boot. The cpu_present_mask is dynamic(*),
63 * representing which CPUs are currently plugged in. And
64 * cpu_online_mask is the dynamic subset of cpu_present_mask,
65 * indicating those CPUs available for scheduling.
67 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
68 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
69 * ACPI reports present at boot.
71 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
72 * depending on what ACPI reports as currently plugged in, otherwise
73 * cpu_present_mask is just a copy of cpu_possible_mask.
75 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
76 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
79 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
80 * assumption that their single CPU is online. The UP
81 * cpu_{online,possible,present}_masks are placebos. Changing them
82 * will have no useful affect on the following num_*_cpus()
83 * and cpu_*() macros in the UP case. This ugliness is a UP
84 * optimization - don't waste any instructions or memory references
85 * asking if you're online or how many CPUs there are if there is
89 extern struct cpumask __cpu_possible_mask;
90 extern struct cpumask __cpu_online_mask;
91 extern struct cpumask __cpu_present_mask;
92 extern struct cpumask __cpu_active_mask;
93 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
94 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
95 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
96 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
99 #define num_online_cpus() cpumask_weight(cpu_online_mask)
100 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
101 #define num_present_cpus() cpumask_weight(cpu_present_mask)
102 #define num_active_cpus() cpumask_weight(cpu_active_mask)
103 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
104 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
105 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
106 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
108 #define num_online_cpus() 1U
109 #define num_possible_cpus() 1U
110 #define num_present_cpus() 1U
111 #define num_active_cpus() 1U
112 #define cpu_online(cpu) ((cpu) == 0)
113 #define cpu_possible(cpu) ((cpu) == 0)
114 #define cpu_present(cpu) ((cpu) == 0)
115 #define cpu_active(cpu) ((cpu) == 0)
118 static inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits)
120 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
121 WARN_ON_ONCE(cpu >= bits);
122 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
125 /* verify cpu argument to cpumask_* operators */
126 static inline unsigned int cpumask_check(unsigned int cpu)
128 cpu_max_bits_warn(cpu, nr_cpumask_bits);
133 /* Uniprocessor. Assume all masks are "1". */
134 static inline unsigned int cpumask_first(const struct cpumask *srcp)
139 static inline unsigned int cpumask_last(const struct cpumask *srcp)
144 /* Valid inputs for n are -1 and 0. */
145 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
150 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
155 static inline unsigned int cpumask_next_and(int n,
156 const struct cpumask *srcp,
157 const struct cpumask *andp)
162 static inline unsigned int cpumask_next_wrap(int n, const struct cpumask *mask,
163 int start, bool wrap)
165 /* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
166 return (wrap && n == 0);
169 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
170 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
176 static inline unsigned int cpumask_local_spread(unsigned int i, int node)
181 #define for_each_cpu(cpu, mask) \
182 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
183 #define for_each_cpu_not(cpu, mask) \
184 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
185 #define for_each_cpu_wrap(cpu, mask, start) \
186 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
187 #define for_each_cpu_and(cpu, mask, and) \
188 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
191 * cpumask_first - get the first cpu in a cpumask
192 * @srcp: the cpumask pointer
194 * Returns >= nr_cpu_ids if no cpus set.
196 static inline unsigned int cpumask_first(const struct cpumask *srcp)
198 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
202 * cpumask_last - get the last CPU in a cpumask
203 * @srcp: - the cpumask pointer
205 * Returns >= nr_cpumask_bits if no CPUs set.
207 static inline unsigned int cpumask_last(const struct cpumask *srcp)
209 return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
212 unsigned int cpumask_next(int n, const struct cpumask *srcp);
215 * cpumask_next_zero - get the next unset cpu in a cpumask
216 * @n: the cpu prior to the place to search (ie. return will be > @n)
217 * @srcp: the cpumask pointer
219 * Returns >= nr_cpu_ids if no further cpus unset.
221 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
223 /* -1 is a legal arg here. */
226 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
229 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
230 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
231 unsigned int cpumask_local_spread(unsigned int i, int node);
234 * for_each_cpu - iterate over every cpu in a mask
235 * @cpu: the (optionally unsigned) integer iterator
236 * @mask: the cpumask pointer
238 * After the loop, cpu is >= nr_cpu_ids.
240 #define for_each_cpu(cpu, mask) \
242 (cpu) = cpumask_next((cpu), (mask)), \
246 * for_each_cpu_not - iterate over every cpu in a complemented mask
247 * @cpu: the (optionally unsigned) integer iterator
248 * @mask: the cpumask pointer
250 * After the loop, cpu is >= nr_cpu_ids.
252 #define for_each_cpu_not(cpu, mask) \
254 (cpu) = cpumask_next_zero((cpu), (mask)), \
257 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
260 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
261 * @cpu: the (optionally unsigned) integer iterator
262 * @mask: the cpumask poiter
263 * @start: the start location
265 * The implementation does not assume any bit in @mask is set (including @start).
267 * After the loop, cpu is >= nr_cpu_ids.
269 #define for_each_cpu_wrap(cpu, mask, start) \
270 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
271 (cpu) < nr_cpumask_bits; \
272 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
275 * for_each_cpu_and - iterate over every cpu in both masks
276 * @cpu: the (optionally unsigned) integer iterator
277 * @mask: the first cpumask pointer
278 * @and: the second cpumask pointer
280 * This saves a temporary CPU mask in many places. It is equivalent to:
281 * struct cpumask tmp;
282 * cpumask_and(&tmp, &mask, &and);
283 * for_each_cpu(cpu, &tmp)
286 * After the loop, cpu is >= nr_cpu_ids.
288 #define for_each_cpu_and(cpu, mask, and) \
290 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
294 #define CPU_BITS_NONE \
296 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
299 #define CPU_BITS_CPU0 \
305 * cpumask_set_cpu - set a cpu in a cpumask
306 * @cpu: cpu number (< nr_cpu_ids)
307 * @dstp: the cpumask pointer
309 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
311 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
314 static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
316 __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
321 * cpumask_clear_cpu - clear a cpu in a cpumask
322 * @cpu: cpu number (< nr_cpu_ids)
323 * @dstp: the cpumask pointer
325 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
327 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
330 static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
332 __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
336 * cpumask_test_cpu - test for a cpu in a cpumask
337 * @cpu: cpu number (< nr_cpu_ids)
338 * @cpumask: the cpumask pointer
340 * Returns 1 if @cpu is set in @cpumask, else returns 0
342 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
344 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
348 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
349 * @cpu: cpu number (< nr_cpu_ids)
350 * @cpumask: the cpumask pointer
352 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
354 * test_and_set_bit wrapper for cpumasks.
356 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
358 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
362 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
363 * @cpu: cpu number (< nr_cpu_ids)
364 * @cpumask: the cpumask pointer
366 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
368 * test_and_clear_bit wrapper for cpumasks.
370 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
372 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
376 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
377 * @dstp: the cpumask pointer
379 static inline void cpumask_setall(struct cpumask *dstp)
381 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
385 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
386 * @dstp: the cpumask pointer
388 static inline void cpumask_clear(struct cpumask *dstp)
390 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
394 * cpumask_and - *dstp = *src1p & *src2p
395 * @dstp: the cpumask result
396 * @src1p: the first input
397 * @src2p: the second input
399 * If *@dstp is empty, returns 0, else returns 1
401 static inline int cpumask_and(struct cpumask *dstp,
402 const struct cpumask *src1p,
403 const struct cpumask *src2p)
405 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
406 cpumask_bits(src2p), nr_cpumask_bits);
410 * cpumask_or - *dstp = *src1p | *src2p
411 * @dstp: the cpumask result
412 * @src1p: the first input
413 * @src2p: the second input
415 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
416 const struct cpumask *src2p)
418 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
419 cpumask_bits(src2p), nr_cpumask_bits);
423 * cpumask_xor - *dstp = *src1p ^ *src2p
424 * @dstp: the cpumask result
425 * @src1p: the first input
426 * @src2p: the second input
428 static inline void cpumask_xor(struct cpumask *dstp,
429 const struct cpumask *src1p,
430 const struct cpumask *src2p)
432 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
433 cpumask_bits(src2p), nr_cpumask_bits);
437 * cpumask_andnot - *dstp = *src1p & ~*src2p
438 * @dstp: the cpumask result
439 * @src1p: the first input
440 * @src2p: the second input
442 * If *@dstp is empty, returns 0, else returns 1
444 static inline int cpumask_andnot(struct cpumask *dstp,
445 const struct cpumask *src1p,
446 const struct cpumask *src2p)
448 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
449 cpumask_bits(src2p), nr_cpumask_bits);
453 * cpumask_complement - *dstp = ~*srcp
454 * @dstp: the cpumask result
455 * @srcp: the input to invert
457 static inline void cpumask_complement(struct cpumask *dstp,
458 const struct cpumask *srcp)
460 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
465 * cpumask_equal - *src1p == *src2p
466 * @src1p: the first input
467 * @src2p: the second input
469 static inline bool cpumask_equal(const struct cpumask *src1p,
470 const struct cpumask *src2p)
472 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
477 * cpumask_intersects - (*src1p & *src2p) != 0
478 * @src1p: the first input
479 * @src2p: the second input
481 static inline bool cpumask_intersects(const struct cpumask *src1p,
482 const struct cpumask *src2p)
484 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
489 * cpumask_subset - (*src1p & ~*src2p) == 0
490 * @src1p: the first input
491 * @src2p: the second input
493 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
495 static inline int cpumask_subset(const struct cpumask *src1p,
496 const struct cpumask *src2p)
498 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
503 * cpumask_empty - *srcp == 0
504 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
506 static inline bool cpumask_empty(const struct cpumask *srcp)
508 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
512 * cpumask_full - *srcp == 0xFFFFFFFF...
513 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
515 static inline bool cpumask_full(const struct cpumask *srcp)
517 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
521 * cpumask_weight - Count of bits in *srcp
522 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
524 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
526 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
530 * cpumask_shift_right - *dstp = *srcp >> n
531 * @dstp: the cpumask result
532 * @srcp: the input to shift
533 * @n: the number of bits to shift by
535 static inline void cpumask_shift_right(struct cpumask *dstp,
536 const struct cpumask *srcp, int n)
538 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
543 * cpumask_shift_left - *dstp = *srcp << n
544 * @dstp: the cpumask result
545 * @srcp: the input to shift
546 * @n: the number of bits to shift by
548 static inline void cpumask_shift_left(struct cpumask *dstp,
549 const struct cpumask *srcp, int n)
551 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
556 * cpumask_copy - *dstp = *srcp
558 * @srcp: the input cpumask
560 static inline void cpumask_copy(struct cpumask *dstp,
561 const struct cpumask *srcp)
563 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
567 * cpumask_any - pick a "random" cpu from *srcp
568 * @srcp: the input cpumask
570 * Returns >= nr_cpu_ids if no cpus set.
572 #define cpumask_any(srcp) cpumask_first(srcp)
575 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
576 * @src1p: the first input
577 * @src2p: the second input
579 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
581 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
584 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
585 * @mask1: the first input cpumask
586 * @mask2: the second input cpumask
588 * Returns >= nr_cpu_ids if no cpus set.
590 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
593 * cpumask_of - the cpumask containing just a given cpu
594 * @cpu: the cpu (<= nr_cpu_ids)
596 #define cpumask_of(cpu) (get_cpu_mask(cpu))
599 * cpumask_parse_user - extract a cpumask from a user string
600 * @buf: the buffer to extract from
601 * @len: the length of the buffer
602 * @dstp: the cpumask to set.
604 * Returns -errno, or 0 for success.
606 static inline int cpumask_parse_user(const char __user *buf, int len,
607 struct cpumask *dstp)
609 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
613 * cpumask_parselist_user - extract a cpumask from a user string
614 * @buf: the buffer to extract from
615 * @len: the length of the buffer
616 * @dstp: the cpumask to set.
618 * Returns -errno, or 0 for success.
620 static inline int cpumask_parselist_user(const char __user *buf, int len,
621 struct cpumask *dstp)
623 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
628 * cpumask_parse - extract a cpumask from a string
629 * @buf: the buffer to extract from
630 * @dstp: the cpumask to set.
632 * Returns -errno, or 0 for success.
634 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
636 char *nl = strchr(buf, '\n');
637 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf);
639 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
643 * cpulist_parse - extract a cpumask from a user string of ranges
644 * @buf: the buffer to extract from
645 * @dstp: the cpumask to set.
647 * Returns -errno, or 0 for success.
649 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
651 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
655 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
657 static inline unsigned int cpumask_size(void)
659 return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
663 * cpumask_var_t: struct cpumask for stack usage.
665 * Oh, the wicked games we play! In order to make kernel coding a
666 * little more difficult, we typedef cpumask_var_t to an array or a
667 * pointer: doing &mask on an array is a noop, so it still works.
670 * cpumask_var_t tmpmask;
671 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
674 * ... use 'tmpmask' like a normal struct cpumask * ...
676 * free_cpumask_var(tmpmask);
679 * However, one notable exception is there. alloc_cpumask_var() allocates
680 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
681 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
683 * cpumask_var_t tmpmask;
684 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
689 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
690 * cpumask_copy() provide safe copy functionality.
692 * Note that there is another evil here: If you define a cpumask_var_t
693 * as a percpu variable then the way to obtain the address of the cpumask
694 * structure differently influences what this_cpu_* operation needs to be
695 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
696 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
697 * other type of cpumask_var_t implementation is configured.
699 * Please also note that __cpumask_var_read_mostly can be used to declare
700 * a cpumask_var_t variable itself (not its content) as read mostly.
702 #ifdef CONFIG_CPUMASK_OFFSTACK
703 typedef struct cpumask *cpumask_var_t;
705 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
706 #define __cpumask_var_read_mostly __read_mostly
708 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
709 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
710 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
711 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
712 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
713 void free_cpumask_var(cpumask_var_t mask);
714 void free_bootmem_cpumask_var(cpumask_var_t mask);
716 static inline bool cpumask_available(cpumask_var_t mask)
722 typedef struct cpumask cpumask_var_t[1];
724 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
725 #define __cpumask_var_read_mostly
727 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
732 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
738 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
740 cpumask_clear(*mask);
744 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
747 cpumask_clear(*mask);
751 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
755 static inline void free_cpumask_var(cpumask_var_t mask)
759 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
763 static inline bool cpumask_available(cpumask_var_t mask)
767 #endif /* CONFIG_CPUMASK_OFFSTACK */
769 /* It's common to want to use cpu_all_mask in struct member initializers,
770 * so it has to refer to an address rather than a pointer. */
771 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
772 #define cpu_all_mask to_cpumask(cpu_all_bits)
774 /* First bits of cpu_bit_bitmap are in fact unset. */
775 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
777 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
778 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
779 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
781 /* Wrappers for arch boot code to manipulate normally-constant masks */
782 void init_cpu_present(const struct cpumask *src);
783 void init_cpu_possible(const struct cpumask *src);
784 void init_cpu_online(const struct cpumask *src);
786 static inline void reset_cpu_possible_mask(void)
788 bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
792 set_cpu_possible(unsigned int cpu, bool possible)
795 cpumask_set_cpu(cpu, &__cpu_possible_mask);
797 cpumask_clear_cpu(cpu, &__cpu_possible_mask);
801 set_cpu_present(unsigned int cpu, bool present)
804 cpumask_set_cpu(cpu, &__cpu_present_mask);
806 cpumask_clear_cpu(cpu, &__cpu_present_mask);
810 set_cpu_online(unsigned int cpu, bool online)
813 cpumask_set_cpu(cpu, &__cpu_online_mask);
815 cpumask_clear_cpu(cpu, &__cpu_online_mask);
819 set_cpu_active(unsigned int cpu, bool active)
822 cpumask_set_cpu(cpu, &__cpu_active_mask);
824 cpumask_clear_cpu(cpu, &__cpu_active_mask);
829 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
830 * @bitmap: the bitmap
832 * There are a few places where cpumask_var_t isn't appropriate and
833 * static cpumasks must be used (eg. very early boot), yet we don't
834 * expose the definition of 'struct cpumask'.
836 * This does the conversion, and can be used as a constant initializer.
838 #define to_cpumask(bitmap) \
839 ((struct cpumask *)(1 ? (bitmap) \
840 : (void *)sizeof(__check_is_bitmap(bitmap))))
842 static inline int __check_is_bitmap(const unsigned long *bitmap)
848 * Special-case data structure for "single bit set only" constant CPU masks.
850 * We pre-generate all the 64 (or 32) possible bit positions, with enough
851 * padding to the left and the right, and return the constant pointer
852 * appropriately offset.
854 extern const unsigned long
855 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
857 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
859 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
860 p -= cpu / BITS_PER_LONG;
861 return to_cpumask(p);
864 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
866 #if NR_CPUS <= BITS_PER_LONG
867 #define CPU_BITS_ALL \
869 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
872 #else /* NR_CPUS > BITS_PER_LONG */
874 #define CPU_BITS_ALL \
876 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
877 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
879 #endif /* NR_CPUS > BITS_PER_LONG */
882 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
883 * as comma-separated list of cpus or hex values of cpumask
884 * @list: indicates whether the cpumap must be list
885 * @mask: the cpumask to copy
886 * @buf: the buffer to copy into
888 * Returns the length of the (null-terminated) @buf string, zero if
891 static inline ssize_t
892 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
894 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
898 #if NR_CPUS <= BITS_PER_LONG
899 #define CPU_MASK_ALL \
901 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
904 #define CPU_MASK_ALL \
906 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
907 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
909 #endif /* NR_CPUS > BITS_PER_LONG */
911 #define CPU_MASK_NONE \
913 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
916 #define CPU_MASK_CPU0 \
921 #endif /* __LINUX_CPUMASK_H */