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 #define for_each_cpu(cpu, mask) \
203 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
204 #define for_each_cpu_not(cpu, mask) \
205 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
206 #define for_each_cpu_wrap(cpu, mask, start) \
207 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
208 #define for_each_cpu_and(cpu, mask1, mask2) \
209 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
212 * cpumask_first - get the first cpu in a cpumask
213 * @srcp: the cpumask pointer
215 * Returns >= nr_cpu_ids if no cpus set.
217 static inline unsigned int cpumask_first(const struct cpumask *srcp)
219 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
223 * cpumask_last - get the last CPU in a cpumask
224 * @srcp: - the cpumask pointer
226 * Returns >= nr_cpumask_bits if no CPUs set.
228 static inline unsigned int cpumask_last(const struct cpumask *srcp)
230 return find_last_bit(cpumask_bits(srcp), nr_cpumask_bits);
233 unsigned int cpumask_next(int n, const struct cpumask *srcp);
236 * cpumask_next_zero - get the next unset cpu in a cpumask
237 * @n: the cpu prior to the place to search (ie. return will be > @n)
238 * @srcp: the cpumask pointer
240 * Returns >= nr_cpu_ids if no further cpus unset.
242 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
244 /* -1 is a legal arg here. */
247 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
250 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
251 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
252 unsigned int cpumask_local_spread(unsigned int i, int node);
253 int cpumask_any_and_distribute(const struct cpumask *src1p,
254 const struct cpumask *src2p);
257 * for_each_cpu - iterate over every cpu in a mask
258 * @cpu: the (optionally unsigned) integer iterator
259 * @mask: the cpumask pointer
261 * After the loop, cpu is >= nr_cpu_ids.
263 #define for_each_cpu(cpu, mask) \
265 (cpu) = cpumask_next((cpu), (mask)), \
269 * for_each_cpu_not - iterate over every cpu in a complemented mask
270 * @cpu: the (optionally unsigned) integer iterator
271 * @mask: the cpumask pointer
273 * After the loop, cpu is >= nr_cpu_ids.
275 #define for_each_cpu_not(cpu, mask) \
277 (cpu) = cpumask_next_zero((cpu), (mask)), \
280 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
283 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
284 * @cpu: the (optionally unsigned) integer iterator
285 * @mask: the cpumask poiter
286 * @start: the start location
288 * The implementation does not assume any bit in @mask is set (including @start).
290 * After the loop, cpu is >= nr_cpu_ids.
292 #define for_each_cpu_wrap(cpu, mask, start) \
293 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
294 (cpu) < nr_cpumask_bits; \
295 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
298 * for_each_cpu_and - iterate over every cpu in both masks
299 * @cpu: the (optionally unsigned) integer iterator
300 * @mask1: the first cpumask pointer
301 * @mask2: the second cpumask pointer
303 * This saves a temporary CPU mask in many places. It is equivalent to:
304 * struct cpumask tmp;
305 * cpumask_and(&tmp, &mask1, &mask2);
306 * for_each_cpu(cpu, &tmp)
309 * After the loop, cpu is >= nr_cpu_ids.
311 #define for_each_cpu_and(cpu, mask1, mask2) \
313 (cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
317 #define CPU_BITS_NONE \
319 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
322 #define CPU_BITS_CPU0 \
328 * cpumask_set_cpu - set a cpu in a cpumask
329 * @cpu: cpu number (< nr_cpu_ids)
330 * @dstp: the cpumask pointer
332 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
334 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
337 static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
339 __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
344 * cpumask_clear_cpu - clear a cpu in a cpumask
345 * @cpu: cpu number (< nr_cpu_ids)
346 * @dstp: the cpumask pointer
348 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
350 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
353 static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
355 __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
359 * cpumask_test_cpu - test for a cpu in a cpumask
360 * @cpu: cpu number (< nr_cpu_ids)
361 * @cpumask: the cpumask pointer
363 * Returns 1 if @cpu is set in @cpumask, else returns 0
365 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
367 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
371 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
372 * @cpu: cpu number (< nr_cpu_ids)
373 * @cpumask: the cpumask pointer
375 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
377 * test_and_set_bit wrapper for cpumasks.
379 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
381 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
385 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
386 * @cpu: cpu number (< nr_cpu_ids)
387 * @cpumask: the cpumask pointer
389 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
391 * test_and_clear_bit wrapper for cpumasks.
393 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
395 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
399 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
400 * @dstp: the cpumask pointer
402 static inline void cpumask_setall(struct cpumask *dstp)
404 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
408 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
409 * @dstp: the cpumask pointer
411 static inline void cpumask_clear(struct cpumask *dstp)
413 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
417 * cpumask_and - *dstp = *src1p & *src2p
418 * @dstp: the cpumask result
419 * @src1p: the first input
420 * @src2p: the second input
422 * If *@dstp is empty, returns 0, else returns 1
424 static inline int cpumask_and(struct cpumask *dstp,
425 const struct cpumask *src1p,
426 const struct cpumask *src2p)
428 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
429 cpumask_bits(src2p), nr_cpumask_bits);
433 * cpumask_or - *dstp = *src1p | *src2p
434 * @dstp: the cpumask result
435 * @src1p: the first input
436 * @src2p: the second input
438 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
439 const struct cpumask *src2p)
441 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
442 cpumask_bits(src2p), nr_cpumask_bits);
446 * cpumask_xor - *dstp = *src1p ^ *src2p
447 * @dstp: the cpumask result
448 * @src1p: the first input
449 * @src2p: the second input
451 static inline void cpumask_xor(struct cpumask *dstp,
452 const struct cpumask *src1p,
453 const struct cpumask *src2p)
455 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
456 cpumask_bits(src2p), nr_cpumask_bits);
460 * cpumask_andnot - *dstp = *src1p & ~*src2p
461 * @dstp: the cpumask result
462 * @src1p: the first input
463 * @src2p: the second input
465 * If *@dstp is empty, returns 0, else returns 1
467 static inline int cpumask_andnot(struct cpumask *dstp,
468 const struct cpumask *src1p,
469 const struct cpumask *src2p)
471 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
472 cpumask_bits(src2p), nr_cpumask_bits);
476 * cpumask_complement - *dstp = ~*srcp
477 * @dstp: the cpumask result
478 * @srcp: the input to invert
480 static inline void cpumask_complement(struct cpumask *dstp,
481 const struct cpumask *srcp)
483 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
488 * cpumask_equal - *src1p == *src2p
489 * @src1p: the first input
490 * @src2p: the second input
492 static inline bool cpumask_equal(const struct cpumask *src1p,
493 const struct cpumask *src2p)
495 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
500 * cpumask_or_equal - *src1p | *src2p == *src3p
501 * @src1p: the first input
502 * @src2p: the second input
503 * @src3p: the third input
505 static inline bool cpumask_or_equal(const struct cpumask *src1p,
506 const struct cpumask *src2p,
507 const struct cpumask *src3p)
509 return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p),
510 cpumask_bits(src3p), nr_cpumask_bits);
514 * cpumask_intersects - (*src1p & *src2p) != 0
515 * @src1p: the first input
516 * @src2p: the second input
518 static inline bool cpumask_intersects(const struct cpumask *src1p,
519 const struct cpumask *src2p)
521 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
526 * cpumask_subset - (*src1p & ~*src2p) == 0
527 * @src1p: the first input
528 * @src2p: the second input
530 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
532 static inline int cpumask_subset(const struct cpumask *src1p,
533 const struct cpumask *src2p)
535 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
540 * cpumask_empty - *srcp == 0
541 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
543 static inline bool cpumask_empty(const struct cpumask *srcp)
545 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
549 * cpumask_full - *srcp == 0xFFFFFFFF...
550 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
552 static inline bool cpumask_full(const struct cpumask *srcp)
554 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
558 * cpumask_weight - Count of bits in *srcp
559 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
561 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
563 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
567 * cpumask_shift_right - *dstp = *srcp >> n
568 * @dstp: the cpumask result
569 * @srcp: the input to shift
570 * @n: the number of bits to shift by
572 static inline void cpumask_shift_right(struct cpumask *dstp,
573 const struct cpumask *srcp, int n)
575 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
580 * cpumask_shift_left - *dstp = *srcp << n
581 * @dstp: the cpumask result
582 * @srcp: the input to shift
583 * @n: the number of bits to shift by
585 static inline void cpumask_shift_left(struct cpumask *dstp,
586 const struct cpumask *srcp, int n)
588 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
593 * cpumask_copy - *dstp = *srcp
595 * @srcp: the input cpumask
597 static inline void cpumask_copy(struct cpumask *dstp,
598 const struct cpumask *srcp)
600 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
604 * cpumask_any - pick a "random" cpu from *srcp
605 * @srcp: the input cpumask
607 * Returns >= nr_cpu_ids if no cpus set.
609 #define cpumask_any(srcp) cpumask_first(srcp)
612 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
613 * @src1p: the first input
614 * @src2p: the second input
616 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
618 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
621 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
622 * @mask1: the first input cpumask
623 * @mask2: the second input cpumask
625 * Returns >= nr_cpu_ids if no cpus set.
627 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
630 * cpumask_of - the cpumask containing just a given cpu
631 * @cpu: the cpu (<= nr_cpu_ids)
633 #define cpumask_of(cpu) (get_cpu_mask(cpu))
636 * cpumask_parse_user - extract a cpumask from a user string
637 * @buf: the buffer to extract from
638 * @len: the length of the buffer
639 * @dstp: the cpumask to set.
641 * Returns -errno, or 0 for success.
643 static inline int cpumask_parse_user(const char __user *buf, int len,
644 struct cpumask *dstp)
646 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
650 * cpumask_parselist_user - extract a cpumask from a user string
651 * @buf: the buffer to extract from
652 * @len: the length of the buffer
653 * @dstp: the cpumask to set.
655 * Returns -errno, or 0 for success.
657 static inline int cpumask_parselist_user(const char __user *buf, int len,
658 struct cpumask *dstp)
660 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
665 * cpumask_parse - extract a cpumask from a string
666 * @buf: the buffer to extract from
667 * @dstp: the cpumask to set.
669 * Returns -errno, or 0 for success.
671 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
673 return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits);
677 * cpulist_parse - extract a cpumask from a user string of ranges
678 * @buf: the buffer to extract from
679 * @dstp: the cpumask to set.
681 * Returns -errno, or 0 for success.
683 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
685 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
689 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
691 static inline unsigned int cpumask_size(void)
693 return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
697 * cpumask_var_t: struct cpumask for stack usage.
699 * Oh, the wicked games we play! In order to make kernel coding a
700 * little more difficult, we typedef cpumask_var_t to an array or a
701 * pointer: doing &mask on an array is a noop, so it still works.
704 * cpumask_var_t tmpmask;
705 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
708 * ... use 'tmpmask' like a normal struct cpumask * ...
710 * free_cpumask_var(tmpmask);
713 * However, one notable exception is there. alloc_cpumask_var() allocates
714 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
715 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
717 * cpumask_var_t tmpmask;
718 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
723 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
724 * cpumask_copy() provide safe copy functionality.
726 * Note that there is another evil here: If you define a cpumask_var_t
727 * as a percpu variable then the way to obtain the address of the cpumask
728 * structure differently influences what this_cpu_* operation needs to be
729 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
730 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
731 * other type of cpumask_var_t implementation is configured.
733 * Please also note that __cpumask_var_read_mostly can be used to declare
734 * a cpumask_var_t variable itself (not its content) as read mostly.
736 #ifdef CONFIG_CPUMASK_OFFSTACK
737 typedef struct cpumask *cpumask_var_t;
739 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
740 #define __cpumask_var_read_mostly __read_mostly
742 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
743 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
744 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
745 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
746 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
747 void free_cpumask_var(cpumask_var_t mask);
748 void free_bootmem_cpumask_var(cpumask_var_t mask);
750 static inline bool cpumask_available(cpumask_var_t mask)
756 typedef struct cpumask cpumask_var_t[1];
758 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
759 #define __cpumask_var_read_mostly
761 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
766 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
772 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
774 cpumask_clear(*mask);
778 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
781 cpumask_clear(*mask);
785 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
789 static inline void free_cpumask_var(cpumask_var_t mask)
793 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
797 static inline bool cpumask_available(cpumask_var_t mask)
801 #endif /* CONFIG_CPUMASK_OFFSTACK */
803 /* It's common to want to use cpu_all_mask in struct member initializers,
804 * so it has to refer to an address rather than a pointer. */
805 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
806 #define cpu_all_mask to_cpumask(cpu_all_bits)
808 /* First bits of cpu_bit_bitmap are in fact unset. */
809 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
811 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
812 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
813 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
815 /* Wrappers for arch boot code to manipulate normally-constant masks */
816 void init_cpu_present(const struct cpumask *src);
817 void init_cpu_possible(const struct cpumask *src);
818 void init_cpu_online(const struct cpumask *src);
820 static inline void reset_cpu_possible_mask(void)
822 bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
826 set_cpu_possible(unsigned int cpu, bool possible)
829 cpumask_set_cpu(cpu, &__cpu_possible_mask);
831 cpumask_clear_cpu(cpu, &__cpu_possible_mask);
835 set_cpu_present(unsigned int cpu, bool present)
838 cpumask_set_cpu(cpu, &__cpu_present_mask);
840 cpumask_clear_cpu(cpu, &__cpu_present_mask);
843 void set_cpu_online(unsigned int cpu, bool online);
846 set_cpu_active(unsigned int cpu, bool active)
849 cpumask_set_cpu(cpu, &__cpu_active_mask);
851 cpumask_clear_cpu(cpu, &__cpu_active_mask);
856 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
857 * @bitmap: the bitmap
859 * There are a few places where cpumask_var_t isn't appropriate and
860 * static cpumasks must be used (eg. very early boot), yet we don't
861 * expose the definition of 'struct cpumask'.
863 * This does the conversion, and can be used as a constant initializer.
865 #define to_cpumask(bitmap) \
866 ((struct cpumask *)(1 ? (bitmap) \
867 : (void *)sizeof(__check_is_bitmap(bitmap))))
869 static inline int __check_is_bitmap(const unsigned long *bitmap)
875 * Special-case data structure for "single bit set only" constant CPU masks.
877 * We pre-generate all the 64 (or 32) possible bit positions, with enough
878 * padding to the left and the right, and return the constant pointer
879 * appropriately offset.
881 extern const unsigned long
882 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
884 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
886 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
887 p -= cpu / BITS_PER_LONG;
888 return to_cpumask(p);
891 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
893 #if NR_CPUS <= BITS_PER_LONG
894 #define CPU_BITS_ALL \
896 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
899 #else /* NR_CPUS > BITS_PER_LONG */
901 #define CPU_BITS_ALL \
903 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
904 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
906 #endif /* NR_CPUS > BITS_PER_LONG */
909 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
910 * as comma-separated list of cpus or hex values of cpumask
911 * @list: indicates whether the cpumap must be list
912 * @mask: the cpumask to copy
913 * @buf: the buffer to copy into
915 * Returns the length of the (null-terminated) @buf string, zero if
918 static inline ssize_t
919 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
921 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
925 #if NR_CPUS <= BITS_PER_LONG
926 #define CPU_MASK_ALL \
928 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
931 #define CPU_MASK_ALL \
933 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
934 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
936 #endif /* NR_CPUS > BITS_PER_LONG */
938 #define CPU_MASK_NONE \
940 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
943 #define CPU_MASK_CPU0 \
948 #endif /* __LINUX_CPUMASK_H */