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 extern struct cpumask __cpu_dying_mask
;
95 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
96 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
97 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
98 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
99 #define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask)
101 extern atomic_t __num_online_cpus
;
103 extern cpumask_t cpus_booted_once_mask
;
105 static inline void cpu_max_bits_warn(unsigned int cpu
, unsigned int bits
)
107 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
108 WARN_ON_ONCE(cpu
>= bits
);
109 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
112 /* verify cpu argument to cpumask_* operators */
113 static inline unsigned int cpumask_check(unsigned int cpu
)
115 cpu_max_bits_warn(cpu
, nr_cpumask_bits
);
120 /* Uniprocessor. Assume all masks are "1". */
121 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
126 static inline unsigned int cpumask_last(const struct cpumask
*srcp
)
131 /* Valid inputs for n are -1 and 0. */
132 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
137 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
142 static inline unsigned int cpumask_next_and(int n
,
143 const struct cpumask
*srcp
,
144 const struct cpumask
*andp
)
149 static inline unsigned int cpumask_next_wrap(int n
, const struct cpumask
*mask
,
150 int start
, bool wrap
)
152 /* cpu0 unless stop condition, wrap and at cpu0, then nr_cpumask_bits */
153 return (wrap
&& n
== 0);
156 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
157 static inline unsigned int cpumask_any_but(const struct cpumask
*mask
,
163 static inline unsigned int cpumask_local_spread(unsigned int i
, int node
)
168 static inline int cpumask_any_and_distribute(const struct cpumask
*src1p
,
169 const struct cpumask
*src2p
) {
170 return cpumask_next_and(-1, src1p
, src2p
);
173 static inline int cpumask_any_distribute(const struct cpumask
*srcp
)
175 return cpumask_first(srcp
);
178 #define for_each_cpu(cpu, mask) \
179 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
180 #define for_each_cpu_not(cpu, mask) \
181 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
182 #define for_each_cpu_wrap(cpu, mask, start) \
183 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)(start))
184 #define for_each_cpu_and(cpu, mask1, mask2) \
185 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask1, (void)mask2)
188 * cpumask_first - get the first cpu in a cpumask
189 * @srcp: the cpumask pointer
191 * Returns >= nr_cpu_ids if no cpus set.
193 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
195 return find_first_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
199 * cpumask_last - get the last CPU in a cpumask
200 * @srcp: - the cpumask pointer
202 * Returns >= nr_cpumask_bits if no CPUs set.
204 static inline unsigned int cpumask_last(const struct cpumask
*srcp
)
206 return find_last_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
209 unsigned int __pure
cpumask_next(int n
, const struct cpumask
*srcp
);
212 * cpumask_next_zero - get the next unset cpu in a cpumask
213 * @n: the cpu prior to the place to search (ie. return will be > @n)
214 * @srcp: the cpumask pointer
216 * Returns >= nr_cpu_ids if no further cpus unset.
218 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
220 /* -1 is a legal arg here. */
223 return find_next_zero_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
226 int __pure
cpumask_next_and(int n
, const struct cpumask
*, const struct cpumask
*);
227 int __pure
cpumask_any_but(const struct cpumask
*mask
, unsigned int cpu
);
228 unsigned int cpumask_local_spread(unsigned int i
, int node
);
229 int cpumask_any_and_distribute(const struct cpumask
*src1p
,
230 const struct cpumask
*src2p
);
231 int cpumask_any_distribute(const struct cpumask
*srcp
);
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 * @mask1: the first cpumask pointer
278 * @mask2: 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, &mask1, &mask2);
283 * for_each_cpu(cpu, &tmp)
286 * After the loop, cpu is >= nr_cpu_ids.
288 #define for_each_cpu_and(cpu, mask1, mask2) \
290 (cpu) = cpumask_next_and((cpu), (mask1), (mask2)), \
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_or_equal - *src1p | *src2p == *src3p
478 * @src1p: the first input
479 * @src2p: the second input
480 * @src3p: the third input
482 static inline bool cpumask_or_equal(const struct cpumask
*src1p
,
483 const struct cpumask
*src2p
,
484 const struct cpumask
*src3p
)
486 return bitmap_or_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
487 cpumask_bits(src3p
), nr_cpumask_bits
);
491 * cpumask_intersects - (*src1p & *src2p) != 0
492 * @src1p: the first input
493 * @src2p: the second input
495 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
496 const struct cpumask
*src2p
)
498 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
503 * cpumask_subset - (*src1p & ~*src2p) == 0
504 * @src1p: the first input
505 * @src2p: the second input
507 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
509 static inline int cpumask_subset(const struct cpumask
*src1p
,
510 const struct cpumask
*src2p
)
512 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
517 * cpumask_empty - *srcp == 0
518 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
520 static inline bool cpumask_empty(const struct cpumask
*srcp
)
522 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
526 * cpumask_full - *srcp == 0xFFFFFFFF...
527 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
529 static inline bool cpumask_full(const struct cpumask
*srcp
)
531 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
535 * cpumask_weight - Count of bits in *srcp
536 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
538 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
540 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
544 * cpumask_shift_right - *dstp = *srcp >> n
545 * @dstp: the cpumask result
546 * @srcp: the input to shift
547 * @n: the number of bits to shift by
549 static inline void cpumask_shift_right(struct cpumask
*dstp
,
550 const struct cpumask
*srcp
, int n
)
552 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
557 * cpumask_shift_left - *dstp = *srcp << n
558 * @dstp: the cpumask result
559 * @srcp: the input to shift
560 * @n: the number of bits to shift by
562 static inline void cpumask_shift_left(struct cpumask
*dstp
,
563 const struct cpumask
*srcp
, int n
)
565 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
570 * cpumask_copy - *dstp = *srcp
572 * @srcp: the input cpumask
574 static inline void cpumask_copy(struct cpumask
*dstp
,
575 const struct cpumask
*srcp
)
577 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
581 * cpumask_any - pick a "random" cpu from *srcp
582 * @srcp: the input cpumask
584 * Returns >= nr_cpu_ids if no cpus set.
586 #define cpumask_any(srcp) cpumask_first(srcp)
589 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
590 * @src1p: the first input
591 * @src2p: the second input
593 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
595 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
598 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
599 * @mask1: the first input cpumask
600 * @mask2: the second input cpumask
602 * Returns >= nr_cpu_ids if no cpus set.
604 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
607 * cpumask_of - the cpumask containing just a given cpu
608 * @cpu: the cpu (<= nr_cpu_ids)
610 #define cpumask_of(cpu) (get_cpu_mask(cpu))
613 * cpumask_parse_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_parse_user(const char __user
*buf
, int len
,
621 struct cpumask
*dstp
)
623 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
627 * cpumask_parselist_user - extract a cpumask from a user string
628 * @buf: the buffer to extract from
629 * @len: the length of the buffer
630 * @dstp: the cpumask to set.
632 * Returns -errno, or 0 for success.
634 static inline int cpumask_parselist_user(const char __user
*buf
, int len
,
635 struct cpumask
*dstp
)
637 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
642 * cpumask_parse - extract a cpumask from a string
643 * @buf: the buffer to extract from
644 * @dstp: the cpumask to set.
646 * Returns -errno, or 0 for success.
648 static inline int cpumask_parse(const char *buf
, struct cpumask
*dstp
)
650 return bitmap_parse(buf
, UINT_MAX
, cpumask_bits(dstp
), nr_cpumask_bits
);
654 * cpulist_parse - extract a cpumask from a user string of ranges
655 * @buf: the buffer to extract from
656 * @dstp: the cpumask to set.
658 * Returns -errno, or 0 for success.
660 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
662 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpumask_bits
);
666 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
668 static inline unsigned int cpumask_size(void)
670 return BITS_TO_LONGS(nr_cpumask_bits
) * sizeof(long);
674 * cpumask_var_t: struct cpumask for stack usage.
676 * Oh, the wicked games we play! In order to make kernel coding a
677 * little more difficult, we typedef cpumask_var_t to an array or a
678 * pointer: doing &mask on an array is a noop, so it still works.
681 * cpumask_var_t tmpmask;
682 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
685 * ... use 'tmpmask' like a normal struct cpumask * ...
687 * free_cpumask_var(tmpmask);
690 * However, one notable exception is there. alloc_cpumask_var() allocates
691 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
692 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
694 * cpumask_var_t tmpmask;
695 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
700 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
701 * cpumask_copy() provide safe copy functionality.
703 * Note that there is another evil here: If you define a cpumask_var_t
704 * as a percpu variable then the way to obtain the address of the cpumask
705 * structure differently influences what this_cpu_* operation needs to be
706 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
707 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
708 * other type of cpumask_var_t implementation is configured.
710 * Please also note that __cpumask_var_read_mostly can be used to declare
711 * a cpumask_var_t variable itself (not its content) as read mostly.
713 #ifdef CONFIG_CPUMASK_OFFSTACK
714 typedef struct cpumask
*cpumask_var_t
;
716 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
717 #define __cpumask_var_read_mostly __read_mostly
719 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
720 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
721 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
722 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
723 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
724 void free_cpumask_var(cpumask_var_t mask
);
725 void free_bootmem_cpumask_var(cpumask_var_t mask
);
727 static inline bool cpumask_available(cpumask_var_t mask
)
733 typedef struct cpumask cpumask_var_t
[1];
735 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
736 #define __cpumask_var_read_mostly
738 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
743 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
749 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
751 cpumask_clear(*mask
);
755 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
758 cpumask_clear(*mask
);
762 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
766 static inline void free_cpumask_var(cpumask_var_t mask
)
770 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
774 static inline bool cpumask_available(cpumask_var_t mask
)
778 #endif /* CONFIG_CPUMASK_OFFSTACK */
780 /* It's common to want to use cpu_all_mask in struct member initializers,
781 * so it has to refer to an address rather than a pointer. */
782 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
783 #define cpu_all_mask to_cpumask(cpu_all_bits)
785 /* First bits of cpu_bit_bitmap are in fact unset. */
786 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
788 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
789 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
790 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
792 /* Wrappers for arch boot code to manipulate normally-constant masks */
793 void init_cpu_present(const struct cpumask
*src
);
794 void init_cpu_possible(const struct cpumask
*src
);
795 void init_cpu_online(const struct cpumask
*src
);
797 static inline void reset_cpu_possible_mask(void)
799 bitmap_zero(cpumask_bits(&__cpu_possible_mask
), NR_CPUS
);
803 set_cpu_possible(unsigned int cpu
, bool possible
)
806 cpumask_set_cpu(cpu
, &__cpu_possible_mask
);
808 cpumask_clear_cpu(cpu
, &__cpu_possible_mask
);
812 set_cpu_present(unsigned int cpu
, bool present
)
815 cpumask_set_cpu(cpu
, &__cpu_present_mask
);
817 cpumask_clear_cpu(cpu
, &__cpu_present_mask
);
820 void set_cpu_online(unsigned int cpu
, bool online
);
823 set_cpu_active(unsigned int cpu
, bool active
)
826 cpumask_set_cpu(cpu
, &__cpu_active_mask
);
828 cpumask_clear_cpu(cpu
, &__cpu_active_mask
);
832 set_cpu_dying(unsigned int cpu
, bool dying
)
835 cpumask_set_cpu(cpu
, &__cpu_dying_mask
);
837 cpumask_clear_cpu(cpu
, &__cpu_dying_mask
);
841 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
842 * @bitmap: the bitmap
844 * There are a few places where cpumask_var_t isn't appropriate and
845 * static cpumasks must be used (eg. very early boot), yet we don't
846 * expose the definition of 'struct cpumask'.
848 * This does the conversion, and can be used as a constant initializer.
850 #define to_cpumask(bitmap) \
851 ((struct cpumask *)(1 ? (bitmap) \
852 : (void *)sizeof(__check_is_bitmap(bitmap))))
854 static inline int __check_is_bitmap(const unsigned long *bitmap
)
860 * Special-case data structure for "single bit set only" constant CPU masks.
862 * We pre-generate all the 64 (or 32) possible bit positions, with enough
863 * padding to the left and the right, and return the constant pointer
864 * appropriately offset.
866 extern const unsigned long
867 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
869 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
871 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
872 p
-= cpu
/ BITS_PER_LONG
;
873 return to_cpumask(p
);
878 * num_online_cpus() - Read the number of online CPUs
880 * Despite the fact that __num_online_cpus is of type atomic_t, this
881 * interface gives only a momentary snapshot and is not protected against
882 * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held
885 static inline unsigned int num_online_cpus(void)
887 return atomic_read(&__num_online_cpus
);
889 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
890 #define num_present_cpus() cpumask_weight(cpu_present_mask)
891 #define num_active_cpus() cpumask_weight(cpu_active_mask)
893 static inline bool cpu_online(unsigned int cpu
)
895 return cpumask_test_cpu(cpu
, cpu_online_mask
);
898 static inline bool cpu_possible(unsigned int cpu
)
900 return cpumask_test_cpu(cpu
, cpu_possible_mask
);
903 static inline bool cpu_present(unsigned int cpu
)
905 return cpumask_test_cpu(cpu
, cpu_present_mask
);
908 static inline bool cpu_active(unsigned int cpu
)
910 return cpumask_test_cpu(cpu
, cpu_active_mask
);
913 static inline bool cpu_dying(unsigned int cpu
)
915 return cpumask_test_cpu(cpu
, cpu_dying_mask
);
920 #define num_online_cpus() 1U
921 #define num_possible_cpus() 1U
922 #define num_present_cpus() 1U
923 #define num_active_cpus() 1U
925 static inline bool cpu_online(unsigned int cpu
)
930 static inline bool cpu_possible(unsigned int cpu
)
935 static inline bool cpu_present(unsigned int cpu
)
940 static inline bool cpu_active(unsigned int cpu
)
945 static inline bool cpu_dying(unsigned int cpu
)
950 #endif /* NR_CPUS > 1 */
952 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
954 #if NR_CPUS <= BITS_PER_LONG
955 #define CPU_BITS_ALL \
957 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
960 #else /* NR_CPUS > BITS_PER_LONG */
962 #define CPU_BITS_ALL \
964 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
965 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
967 #endif /* NR_CPUS > BITS_PER_LONG */
970 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
971 * as comma-separated list of cpus or hex values of cpumask
972 * @list: indicates whether the cpumap must be list
973 * @mask: the cpumask to copy
974 * @buf: the buffer to copy into
976 * Returns the length of the (null-terminated) @buf string, zero if
979 static inline ssize_t
980 cpumap_print_to_pagebuf(bool list
, char *buf
, const struct cpumask
*mask
)
982 return bitmap_print_to_pagebuf(list
, buf
, cpumask_bits(mask
),
986 #if NR_CPUS <= BITS_PER_LONG
987 #define CPU_MASK_ALL \
989 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
992 #define CPU_MASK_ALL \
994 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
995 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
997 #endif /* NR_CPUS > BITS_PER_LONG */
999 #define CPU_MASK_NONE \
1001 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
1004 #define CPU_MASK_CPU0 \
1009 #endif /* __LINUX_CPUMASK_H */