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 /* verify cpu argument to cpumask_* operators */
119 static inline unsigned int cpumask_check(unsigned int cpu
)
121 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
122 WARN_ON_ONCE(cpu
>= nr_cpumask_bits
);
123 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
128 /* Uniprocessor. Assume all masks are "1". */
129 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
134 static inline unsigned int cpumask_last(const struct cpumask
*srcp
)
139 /* Valid inputs for n are -1 and 0. */
140 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
145 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
150 static inline unsigned int cpumask_next_and(int n
,
151 const struct cpumask
*srcp
,
152 const struct cpumask
*andp
)
157 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
158 static inline unsigned int cpumask_any_but(const struct cpumask
*mask
,
164 static inline unsigned int cpumask_local_spread(unsigned int i
, int node
)
169 #define for_each_cpu(cpu, mask) \
170 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
171 #define for_each_cpu_not(cpu, mask) \
172 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
173 #define for_each_cpu_wrap(cpu, mask, start) \
174 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
175 #define for_each_cpu_and(cpu, mask, and) \
176 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
179 * cpumask_first - get the first cpu in a cpumask
180 * @srcp: the cpumask pointer
182 * Returns >= nr_cpu_ids if no cpus set.
184 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
186 return find_first_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
190 * cpumask_last - get the last CPU in a cpumask
191 * @srcp: - the cpumask pointer
193 * Returns >= nr_cpumask_bits if no CPUs set.
195 static inline unsigned int cpumask_last(const struct cpumask
*srcp
)
197 return find_last_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
200 unsigned int cpumask_next(int n
, const struct cpumask
*srcp
);
203 * cpumask_next_zero - get the next unset cpu in a cpumask
204 * @n: the cpu prior to the place to search (ie. return will be > @n)
205 * @srcp: the cpumask pointer
207 * Returns >= nr_cpu_ids if no further cpus unset.
209 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
211 /* -1 is a legal arg here. */
214 return find_next_zero_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
217 int cpumask_next_and(int n
, const struct cpumask
*, const struct cpumask
*);
218 int cpumask_any_but(const struct cpumask
*mask
, unsigned int cpu
);
219 unsigned int cpumask_local_spread(unsigned int i
, int node
);
222 * for_each_cpu - iterate over every cpu in a mask
223 * @cpu: the (optionally unsigned) integer iterator
224 * @mask: the cpumask pointer
226 * After the loop, cpu is >= nr_cpu_ids.
228 #define for_each_cpu(cpu, mask) \
230 (cpu) = cpumask_next((cpu), (mask)), \
234 * for_each_cpu_not - iterate over every cpu in a complemented 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_not(cpu, mask) \
242 (cpu) = cpumask_next_zero((cpu), (mask)), \
245 extern int cpumask_next_wrap(int n
, const struct cpumask
*mask
, int start
, bool wrap
);
248 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
249 * @cpu: the (optionally unsigned) integer iterator
250 * @mask: the cpumask poiter
251 * @start: the start location
253 * The implementation does not assume any bit in @mask is set (including @start).
255 * After the loop, cpu is >= nr_cpu_ids.
257 #define for_each_cpu_wrap(cpu, mask, start) \
258 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
259 (cpu) < nr_cpumask_bits; \
260 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
263 * for_each_cpu_and - iterate over every cpu in both masks
264 * @cpu: the (optionally unsigned) integer iterator
265 * @mask: the first cpumask pointer
266 * @and: the second cpumask pointer
268 * This saves a temporary CPU mask in many places. It is equivalent to:
269 * struct cpumask tmp;
270 * cpumask_and(&tmp, &mask, &and);
271 * for_each_cpu(cpu, &tmp)
274 * After the loop, cpu is >= nr_cpu_ids.
276 #define for_each_cpu_and(cpu, mask, and) \
278 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
282 #define CPU_BITS_NONE \
284 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
287 #define CPU_BITS_CPU0 \
293 * cpumask_set_cpu - set a cpu in a cpumask
294 * @cpu: cpu number (< nr_cpu_ids)
295 * @dstp: the cpumask pointer
297 static inline void cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
299 set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
302 static inline void __cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
304 __set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
309 * cpumask_clear_cpu - clear a cpu in a cpumask
310 * @cpu: cpu number (< nr_cpu_ids)
311 * @dstp: the cpumask pointer
313 static inline void cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
315 clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
318 static inline void __cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
320 __clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
324 * cpumask_test_cpu - test for a cpu in a cpumask
325 * @cpu: cpu number (< nr_cpu_ids)
326 * @cpumask: the cpumask pointer
328 * Returns 1 if @cpu is set in @cpumask, else returns 0
330 static inline int cpumask_test_cpu(int cpu
, const struct cpumask
*cpumask
)
332 return test_bit(cpumask_check(cpu
), cpumask_bits((cpumask
)));
336 * cpumask_test_and_set_cpu - atomically test and set 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 old bitmap of @cpumask, else returns 0
342 * test_and_set_bit wrapper for cpumasks.
344 static inline int cpumask_test_and_set_cpu(int cpu
, struct cpumask
*cpumask
)
346 return test_and_set_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
350 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
351 * @cpu: cpu number (< nr_cpu_ids)
352 * @cpumask: the cpumask pointer
354 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
356 * test_and_clear_bit wrapper for cpumasks.
358 static inline int cpumask_test_and_clear_cpu(int cpu
, struct cpumask
*cpumask
)
360 return test_and_clear_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
364 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
365 * @dstp: the cpumask pointer
367 static inline void cpumask_setall(struct cpumask
*dstp
)
369 bitmap_fill(cpumask_bits(dstp
), nr_cpumask_bits
);
373 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
374 * @dstp: the cpumask pointer
376 static inline void cpumask_clear(struct cpumask
*dstp
)
378 bitmap_zero(cpumask_bits(dstp
), nr_cpumask_bits
);
382 * cpumask_and - *dstp = *src1p & *src2p
383 * @dstp: the cpumask result
384 * @src1p: the first input
385 * @src2p: the second input
387 * If *@dstp is empty, returns 0, else returns 1
389 static inline int cpumask_and(struct cpumask
*dstp
,
390 const struct cpumask
*src1p
,
391 const struct cpumask
*src2p
)
393 return bitmap_and(cpumask_bits(dstp
), cpumask_bits(src1p
),
394 cpumask_bits(src2p
), nr_cpumask_bits
);
398 * cpumask_or - *dstp = *src1p | *src2p
399 * @dstp: the cpumask result
400 * @src1p: the first input
401 * @src2p: the second input
403 static inline void cpumask_or(struct cpumask
*dstp
, const struct cpumask
*src1p
,
404 const struct cpumask
*src2p
)
406 bitmap_or(cpumask_bits(dstp
), cpumask_bits(src1p
),
407 cpumask_bits(src2p
), nr_cpumask_bits
);
411 * cpumask_xor - *dstp = *src1p ^ *src2p
412 * @dstp: the cpumask result
413 * @src1p: the first input
414 * @src2p: the second input
416 static inline void cpumask_xor(struct cpumask
*dstp
,
417 const struct cpumask
*src1p
,
418 const struct cpumask
*src2p
)
420 bitmap_xor(cpumask_bits(dstp
), cpumask_bits(src1p
),
421 cpumask_bits(src2p
), nr_cpumask_bits
);
425 * cpumask_andnot - *dstp = *src1p & ~*src2p
426 * @dstp: the cpumask result
427 * @src1p: the first input
428 * @src2p: the second input
430 * If *@dstp is empty, returns 0, else returns 1
432 static inline int cpumask_andnot(struct cpumask
*dstp
,
433 const struct cpumask
*src1p
,
434 const struct cpumask
*src2p
)
436 return bitmap_andnot(cpumask_bits(dstp
), cpumask_bits(src1p
),
437 cpumask_bits(src2p
), nr_cpumask_bits
);
441 * cpumask_complement - *dstp = ~*srcp
442 * @dstp: the cpumask result
443 * @srcp: the input to invert
445 static inline void cpumask_complement(struct cpumask
*dstp
,
446 const struct cpumask
*srcp
)
448 bitmap_complement(cpumask_bits(dstp
), cpumask_bits(srcp
),
453 * cpumask_equal - *src1p == *src2p
454 * @src1p: the first input
455 * @src2p: the second input
457 static inline bool cpumask_equal(const struct cpumask
*src1p
,
458 const struct cpumask
*src2p
)
460 return bitmap_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
465 * cpumask_intersects - (*src1p & *src2p) != 0
466 * @src1p: the first input
467 * @src2p: the second input
469 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
470 const struct cpumask
*src2p
)
472 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
477 * cpumask_subset - (*src1p & ~*src2p) == 0
478 * @src1p: the first input
479 * @src2p: the second input
481 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
483 static inline int cpumask_subset(const struct cpumask
*src1p
,
484 const struct cpumask
*src2p
)
486 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
491 * cpumask_empty - *srcp == 0
492 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
494 static inline bool cpumask_empty(const struct cpumask
*srcp
)
496 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
500 * cpumask_full - *srcp == 0xFFFFFFFF...
501 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
503 static inline bool cpumask_full(const struct cpumask
*srcp
)
505 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
509 * cpumask_weight - Count of bits in *srcp
510 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
512 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
514 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
518 * cpumask_shift_right - *dstp = *srcp >> n
519 * @dstp: the cpumask result
520 * @srcp: the input to shift
521 * @n: the number of bits to shift by
523 static inline void cpumask_shift_right(struct cpumask
*dstp
,
524 const struct cpumask
*srcp
, int n
)
526 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
531 * cpumask_shift_left - *dstp = *srcp << n
532 * @dstp: the cpumask result
533 * @srcp: the input to shift
534 * @n: the number of bits to shift by
536 static inline void cpumask_shift_left(struct cpumask
*dstp
,
537 const struct cpumask
*srcp
, int n
)
539 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
544 * cpumask_copy - *dstp = *srcp
546 * @srcp: the input cpumask
548 static inline void cpumask_copy(struct cpumask
*dstp
,
549 const struct cpumask
*srcp
)
551 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
555 * cpumask_any - pick a "random" cpu from *srcp
556 * @srcp: the input cpumask
558 * Returns >= nr_cpu_ids if no cpus set.
560 #define cpumask_any(srcp) cpumask_first(srcp)
563 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
564 * @src1p: the first input
565 * @src2p: the second input
567 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
569 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
572 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
573 * @mask1: the first input cpumask
574 * @mask2: the second input cpumask
576 * Returns >= nr_cpu_ids if no cpus set.
578 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
581 * cpumask_of - the cpumask containing just a given cpu
582 * @cpu: the cpu (<= nr_cpu_ids)
584 #define cpumask_of(cpu) (get_cpu_mask(cpu))
587 * cpumask_parse_user - extract a cpumask from a user string
588 * @buf: the buffer to extract from
589 * @len: the length of the buffer
590 * @dstp: the cpumask to set.
592 * Returns -errno, or 0 for success.
594 static inline int cpumask_parse_user(const char __user
*buf
, int len
,
595 struct cpumask
*dstp
)
597 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
601 * cpumask_parselist_user - extract a cpumask from a user string
602 * @buf: the buffer to extract from
603 * @len: the length of the buffer
604 * @dstp: the cpumask to set.
606 * Returns -errno, or 0 for success.
608 static inline int cpumask_parselist_user(const char __user
*buf
, int len
,
609 struct cpumask
*dstp
)
611 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
616 * cpumask_parse - extract a cpumask from a string
617 * @buf: the buffer to extract from
618 * @dstp: the cpumask to set.
620 * Returns -errno, or 0 for success.
622 static inline int cpumask_parse(const char *buf
, struct cpumask
*dstp
)
624 char *nl
= strchr(buf
, '\n');
625 unsigned int len
= nl
? (unsigned int)(nl
- buf
) : strlen(buf
);
627 return bitmap_parse(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
631 * cpulist_parse - extract a cpumask from a user string of ranges
632 * @buf: the buffer to extract from
633 * @dstp: the cpumask to set.
635 * Returns -errno, or 0 for success.
637 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
639 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpumask_bits
);
643 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
645 static inline size_t cpumask_size(void)
647 return BITS_TO_LONGS(nr_cpumask_bits
) * sizeof(long);
651 * cpumask_var_t: struct cpumask for stack usage.
653 * Oh, the wicked games we play! In order to make kernel coding a
654 * little more difficult, we typedef cpumask_var_t to an array or a
655 * pointer: doing &mask on an array is a noop, so it still works.
658 * cpumask_var_t tmpmask;
659 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
662 * ... use 'tmpmask' like a normal struct cpumask * ...
664 * free_cpumask_var(tmpmask);
667 * However, one notable exception is there. alloc_cpumask_var() allocates
668 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
669 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
671 * cpumask_var_t tmpmask;
672 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
677 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
678 * cpumask_copy() provide safe copy functionality.
680 * Note that there is another evil here: If you define a cpumask_var_t
681 * as a percpu variable then the way to obtain the address of the cpumask
682 * structure differently influences what this_cpu_* operation needs to be
683 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
684 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
685 * other type of cpumask_var_t implementation is configured.
687 * Please also note that __cpumask_var_read_mostly can be used to declare
688 * a cpumask_var_t variable itself (not its content) as read mostly.
690 #ifdef CONFIG_CPUMASK_OFFSTACK
691 typedef struct cpumask
*cpumask_var_t
;
693 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
694 #define __cpumask_var_read_mostly __read_mostly
696 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
697 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
698 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
699 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
700 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
701 void free_cpumask_var(cpumask_var_t mask
);
702 void free_bootmem_cpumask_var(cpumask_var_t mask
);
704 static inline bool cpumask_available(cpumask_var_t mask
)
710 typedef struct cpumask cpumask_var_t
[1];
712 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
713 #define __cpumask_var_read_mostly
715 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
720 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
726 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
728 cpumask_clear(*mask
);
732 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
735 cpumask_clear(*mask
);
739 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
743 static inline void free_cpumask_var(cpumask_var_t mask
)
747 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
751 static inline bool cpumask_available(cpumask_var_t mask
)
755 #endif /* CONFIG_CPUMASK_OFFSTACK */
757 /* It's common to want to use cpu_all_mask in struct member initializers,
758 * so it has to refer to an address rather than a pointer. */
759 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
760 #define cpu_all_mask to_cpumask(cpu_all_bits)
762 /* First bits of cpu_bit_bitmap are in fact unset. */
763 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
765 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
766 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
767 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
769 /* Wrappers for arch boot code to manipulate normally-constant masks */
770 void init_cpu_present(const struct cpumask
*src
);
771 void init_cpu_possible(const struct cpumask
*src
);
772 void init_cpu_online(const struct cpumask
*src
);
774 static inline void reset_cpu_possible_mask(void)
776 bitmap_zero(cpumask_bits(&__cpu_possible_mask
), NR_CPUS
);
780 set_cpu_possible(unsigned int cpu
, bool possible
)
783 cpumask_set_cpu(cpu
, &__cpu_possible_mask
);
785 cpumask_clear_cpu(cpu
, &__cpu_possible_mask
);
789 set_cpu_present(unsigned int cpu
, bool present
)
792 cpumask_set_cpu(cpu
, &__cpu_present_mask
);
794 cpumask_clear_cpu(cpu
, &__cpu_present_mask
);
798 set_cpu_online(unsigned int cpu
, bool online
)
801 cpumask_set_cpu(cpu
, &__cpu_online_mask
);
803 cpumask_clear_cpu(cpu
, &__cpu_online_mask
);
807 set_cpu_active(unsigned int cpu
, bool active
)
810 cpumask_set_cpu(cpu
, &__cpu_active_mask
);
812 cpumask_clear_cpu(cpu
, &__cpu_active_mask
);
817 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
818 * @bitmap: the bitmap
820 * There are a few places where cpumask_var_t isn't appropriate and
821 * static cpumasks must be used (eg. very early boot), yet we don't
822 * expose the definition of 'struct cpumask'.
824 * This does the conversion, and can be used as a constant initializer.
826 #define to_cpumask(bitmap) \
827 ((struct cpumask *)(1 ? (bitmap) \
828 : (void *)sizeof(__check_is_bitmap(bitmap))))
830 static inline int __check_is_bitmap(const unsigned long *bitmap
)
836 * Special-case data structure for "single bit set only" constant CPU masks.
838 * We pre-generate all the 64 (or 32) possible bit positions, with enough
839 * padding to the left and the right, and return the constant pointer
840 * appropriately offset.
842 extern const unsigned long
843 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
845 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
847 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
848 p
-= cpu
/ BITS_PER_LONG
;
849 return to_cpumask(p
);
852 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
854 #if NR_CPUS <= BITS_PER_LONG
855 #define CPU_BITS_ALL \
857 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
860 #else /* NR_CPUS > BITS_PER_LONG */
862 #define CPU_BITS_ALL \
864 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
865 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
867 #endif /* NR_CPUS > BITS_PER_LONG */
870 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
871 * as comma-separated list of cpus or hex values of cpumask
872 * @list: indicates whether the cpumap must be list
873 * @mask: the cpumask to copy
874 * @buf: the buffer to copy into
876 * Returns the length of the (null-terminated) @buf string, zero if
879 static inline ssize_t
880 cpumap_print_to_pagebuf(bool list
, char *buf
, const struct cpumask
*mask
)
882 return bitmap_print_to_pagebuf(list
, buf
, cpumask_bits(mask
),
886 #if NR_CPUS <= BITS_PER_LONG
887 #define CPU_MASK_ALL \
889 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
892 #define CPU_MASK_ALL \
894 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
895 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
897 #endif /* NR_CPUS > BITS_PER_LONG */
899 #define CPU_MASK_NONE \
901 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
904 #define CPU_MASK_CPU0 \
909 #endif /* __LINUX_CPUMASK_H */