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 /* Valid inputs for n are -1 and 0. */
135 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
140 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
145 static inline unsigned int cpumask_next_and(int n,
146 const struct cpumask *srcp,
147 const struct cpumask *andp)
152 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
153 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
159 static inline unsigned int cpumask_local_spread(unsigned int i, int node)
164 #define for_each_cpu(cpu, mask) \
165 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
166 #define for_each_cpu_not(cpu, mask) \
167 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
168 #define for_each_cpu_and(cpu, mask, and) \
169 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
172 * cpumask_first - get the first cpu in a cpumask
173 * @srcp: the cpumask pointer
175 * Returns >= nr_cpu_ids if no cpus set.
177 static inline unsigned int cpumask_first(const struct cpumask *srcp)
179 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
182 unsigned int cpumask_next(int n, const struct cpumask *srcp);
185 * cpumask_next_zero - get the next unset cpu in a cpumask
186 * @n: the cpu prior to the place to search (ie. return will be > @n)
187 * @srcp: the cpumask pointer
189 * Returns >= nr_cpu_ids if no further cpus unset.
191 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
193 /* -1 is a legal arg here. */
196 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
199 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
200 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
201 unsigned int cpumask_local_spread(unsigned int i, int node);
204 * for_each_cpu - iterate over every cpu in a mask
205 * @cpu: the (optionally unsigned) integer iterator
206 * @mask: the cpumask pointer
208 * After the loop, cpu is >= nr_cpu_ids.
210 #define for_each_cpu(cpu, mask) \
212 (cpu) = cpumask_next((cpu), (mask)), \
216 * for_each_cpu_not - iterate over every cpu in a complemented mask
217 * @cpu: the (optionally unsigned) integer iterator
218 * @mask: the cpumask pointer
220 * After the loop, cpu is >= nr_cpu_ids.
222 #define for_each_cpu_not(cpu, mask) \
224 (cpu) = cpumask_next_zero((cpu), (mask)), \
227 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
230 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
231 * @cpu: the (optionally unsigned) integer iterator
232 * @mask: the cpumask poiter
233 * @start: the start location
235 * The implementation does not assume any bit in @mask is set (including @start).
237 * After the loop, cpu is >= nr_cpu_ids.
239 #define for_each_cpu_wrap(cpu, mask, start) \
240 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
241 (cpu) < nr_cpumask_bits; \
242 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
245 * for_each_cpu_and - iterate over every cpu in both masks
246 * @cpu: the (optionally unsigned) integer iterator
247 * @mask: the first cpumask pointer
248 * @and: the second cpumask pointer
250 * This saves a temporary CPU mask in many places. It is equivalent to:
251 * struct cpumask tmp;
252 * cpumask_and(&tmp, &mask, &and);
253 * for_each_cpu(cpu, &tmp)
256 * After the loop, cpu is >= nr_cpu_ids.
258 #define for_each_cpu_and(cpu, mask, and) \
260 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
264 #define CPU_BITS_NONE \
266 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
269 #define CPU_BITS_CPU0 \
275 * cpumask_set_cpu - set a cpu in a cpumask
276 * @cpu: cpu number (< nr_cpu_ids)
277 * @dstp: the cpumask pointer
279 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
281 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
284 static inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
286 __set_bit(cpumask_check(cpu), cpumask_bits(dstp));
291 * cpumask_clear_cpu - clear a cpu in a cpumask
292 * @cpu: cpu number (< nr_cpu_ids)
293 * @dstp: the cpumask pointer
295 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
297 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
300 static inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp)
302 __clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
306 * cpumask_test_cpu - test for a cpu in a cpumask
307 * @cpu: cpu number (< nr_cpu_ids)
308 * @cpumask: the cpumask pointer
310 * Returns 1 if @cpu is set in @cpumask, else returns 0
312 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask)
314 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask)));
318 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
319 * @cpu: cpu number (< nr_cpu_ids)
320 * @cpumask: the cpumask pointer
322 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
324 * test_and_set_bit wrapper for cpumasks.
326 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
328 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
332 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
333 * @cpu: cpu number (< nr_cpu_ids)
334 * @cpumask: the cpumask pointer
336 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
338 * test_and_clear_bit wrapper for cpumasks.
340 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
342 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
346 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
347 * @dstp: the cpumask pointer
349 static inline void cpumask_setall(struct cpumask *dstp)
351 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
355 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
356 * @dstp: the cpumask pointer
358 static inline void cpumask_clear(struct cpumask *dstp)
360 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
364 * cpumask_and - *dstp = *src1p & *src2p
365 * @dstp: the cpumask result
366 * @src1p: the first input
367 * @src2p: the second input
369 * If *@dstp is empty, returns 0, else returns 1
371 static inline int cpumask_and(struct cpumask *dstp,
372 const struct cpumask *src1p,
373 const struct cpumask *src2p)
375 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
376 cpumask_bits(src2p), nr_cpumask_bits);
380 * cpumask_or - *dstp = *src1p | *src2p
381 * @dstp: the cpumask result
382 * @src1p: the first input
383 * @src2p: the second input
385 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
386 const struct cpumask *src2p)
388 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
389 cpumask_bits(src2p), nr_cpumask_bits);
393 * cpumask_xor - *dstp = *src1p ^ *src2p
394 * @dstp: the cpumask result
395 * @src1p: the first input
396 * @src2p: the second input
398 static inline void cpumask_xor(struct cpumask *dstp,
399 const struct cpumask *src1p,
400 const struct cpumask *src2p)
402 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
403 cpumask_bits(src2p), nr_cpumask_bits);
407 * cpumask_andnot - *dstp = *src1p & ~*src2p
408 * @dstp: the cpumask result
409 * @src1p: the first input
410 * @src2p: the second input
412 * If *@dstp is empty, returns 0, else returns 1
414 static inline int cpumask_andnot(struct cpumask *dstp,
415 const struct cpumask *src1p,
416 const struct cpumask *src2p)
418 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
419 cpumask_bits(src2p), nr_cpumask_bits);
423 * cpumask_complement - *dstp = ~*srcp
424 * @dstp: the cpumask result
425 * @srcp: the input to invert
427 static inline void cpumask_complement(struct cpumask *dstp,
428 const struct cpumask *srcp)
430 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
435 * cpumask_equal - *src1p == *src2p
436 * @src1p: the first input
437 * @src2p: the second input
439 static inline bool cpumask_equal(const struct cpumask *src1p,
440 const struct cpumask *src2p)
442 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
447 * cpumask_intersects - (*src1p & *src2p) != 0
448 * @src1p: the first input
449 * @src2p: the second input
451 static inline bool cpumask_intersects(const struct cpumask *src1p,
452 const struct cpumask *src2p)
454 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
459 * cpumask_subset - (*src1p & ~*src2p) == 0
460 * @src1p: the first input
461 * @src2p: the second input
463 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
465 static inline int cpumask_subset(const struct cpumask *src1p,
466 const struct cpumask *src2p)
468 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
473 * cpumask_empty - *srcp == 0
474 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
476 static inline bool cpumask_empty(const struct cpumask *srcp)
478 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
482 * cpumask_full - *srcp == 0xFFFFFFFF...
483 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
485 static inline bool cpumask_full(const struct cpumask *srcp)
487 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
491 * cpumask_weight - Count of bits in *srcp
492 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
494 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
496 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
500 * cpumask_shift_right - *dstp = *srcp >> n
501 * @dstp: the cpumask result
502 * @srcp: the input to shift
503 * @n: the number of bits to shift by
505 static inline void cpumask_shift_right(struct cpumask *dstp,
506 const struct cpumask *srcp, int n)
508 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
513 * cpumask_shift_left - *dstp = *srcp << n
514 * @dstp: the cpumask result
515 * @srcp: the input to shift
516 * @n: the number of bits to shift by
518 static inline void cpumask_shift_left(struct cpumask *dstp,
519 const struct cpumask *srcp, int n)
521 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
526 * cpumask_copy - *dstp = *srcp
528 * @srcp: the input cpumask
530 static inline void cpumask_copy(struct cpumask *dstp,
531 const struct cpumask *srcp)
533 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
537 * cpumask_any - pick a "random" cpu from *srcp
538 * @srcp: the input cpumask
540 * Returns >= nr_cpu_ids if no cpus set.
542 #define cpumask_any(srcp) cpumask_first(srcp)
545 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
546 * @src1p: the first input
547 * @src2p: the second input
549 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
551 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
554 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
555 * @mask1: the first input cpumask
556 * @mask2: the second input cpumask
558 * Returns >= nr_cpu_ids if no cpus set.
560 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
563 * cpumask_of - the cpumask containing just a given cpu
564 * @cpu: the cpu (<= nr_cpu_ids)
566 #define cpumask_of(cpu) (get_cpu_mask(cpu))
569 * cpumask_parse_user - extract a cpumask from a user string
570 * @buf: the buffer to extract from
571 * @len: the length of the buffer
572 * @dstp: the cpumask to set.
574 * Returns -errno, or 0 for success.
576 static inline int cpumask_parse_user(const char __user *buf, int len,
577 struct cpumask *dstp)
579 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
583 * cpumask_parselist_user - extract a cpumask from a user string
584 * @buf: the buffer to extract from
585 * @len: the length of the buffer
586 * @dstp: the cpumask to set.
588 * Returns -errno, or 0 for success.
590 static inline int cpumask_parselist_user(const char __user *buf, int len,
591 struct cpumask *dstp)
593 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
598 * cpumask_parse - extract a cpumask from a string
599 * @buf: the buffer to extract from
600 * @dstp: the cpumask to set.
602 * Returns -errno, or 0 for success.
604 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
606 char *nl = strchr(buf, '\n');
607 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf);
609 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
613 * cpulist_parse - extract a cpumask from a user string of ranges
614 * @buf: the buffer to extract from
615 * @dstp: the cpumask to set.
617 * Returns -errno, or 0 for success.
619 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
621 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
625 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
627 static inline size_t cpumask_size(void)
629 return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long);
633 * cpumask_var_t: struct cpumask for stack usage.
635 * Oh, the wicked games we play! In order to make kernel coding a
636 * little more difficult, we typedef cpumask_var_t to an array or a
637 * pointer: doing &mask on an array is a noop, so it still works.
640 * cpumask_var_t tmpmask;
641 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
644 * ... use 'tmpmask' like a normal struct cpumask * ...
646 * free_cpumask_var(tmpmask);
649 * However, one notable exception is there. alloc_cpumask_var() allocates
650 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
651 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
653 * cpumask_var_t tmpmask;
654 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
659 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
660 * cpumask_copy() provide safe copy functionality.
662 * Note that there is another evil here: If you define a cpumask_var_t
663 * as a percpu variable then the way to obtain the address of the cpumask
664 * structure differently influences what this_cpu_* operation needs to be
665 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
666 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
667 * other type of cpumask_var_t implementation is configured.
669 * Please also note that __cpumask_var_read_mostly can be used to declare
670 * a cpumask_var_t variable itself (not its content) as read mostly.
672 #ifdef CONFIG_CPUMASK_OFFSTACK
673 typedef struct cpumask *cpumask_var_t;
675 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
676 #define __cpumask_var_read_mostly __read_mostly
678 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
679 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
680 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
681 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
682 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
683 void free_cpumask_var(cpumask_var_t mask);
684 void free_bootmem_cpumask_var(cpumask_var_t mask);
686 static inline bool cpumask_available(cpumask_var_t mask)
692 typedef struct cpumask cpumask_var_t[1];
694 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
695 #define __cpumask_var_read_mostly
697 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
702 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
708 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
710 cpumask_clear(*mask);
714 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
717 cpumask_clear(*mask);
721 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
725 static inline void free_cpumask_var(cpumask_var_t mask)
729 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
733 static inline bool cpumask_available(cpumask_var_t mask)
737 #endif /* CONFIG_CPUMASK_OFFSTACK */
739 /* It's common to want to use cpu_all_mask in struct member initializers,
740 * so it has to refer to an address rather than a pointer. */
741 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
742 #define cpu_all_mask to_cpumask(cpu_all_bits)
744 /* First bits of cpu_bit_bitmap are in fact unset. */
745 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
747 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
748 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
749 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
751 /* Wrappers for arch boot code to manipulate normally-constant masks */
752 void init_cpu_present(const struct cpumask *src);
753 void init_cpu_possible(const struct cpumask *src);
754 void init_cpu_online(const struct cpumask *src);
756 static inline void reset_cpu_possible_mask(void)
758 bitmap_zero(cpumask_bits(&__cpu_possible_mask), NR_CPUS);
762 set_cpu_possible(unsigned int cpu, bool possible)
765 cpumask_set_cpu(cpu, &__cpu_possible_mask);
767 cpumask_clear_cpu(cpu, &__cpu_possible_mask);
771 set_cpu_present(unsigned int cpu, bool present)
774 cpumask_set_cpu(cpu, &__cpu_present_mask);
776 cpumask_clear_cpu(cpu, &__cpu_present_mask);
780 set_cpu_online(unsigned int cpu, bool online)
783 cpumask_set_cpu(cpu, &__cpu_online_mask);
785 cpumask_clear_cpu(cpu, &__cpu_online_mask);
789 set_cpu_active(unsigned int cpu, bool active)
792 cpumask_set_cpu(cpu, &__cpu_active_mask);
794 cpumask_clear_cpu(cpu, &__cpu_active_mask);
799 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
800 * @bitmap: the bitmap
802 * There are a few places where cpumask_var_t isn't appropriate and
803 * static cpumasks must be used (eg. very early boot), yet we don't
804 * expose the definition of 'struct cpumask'.
806 * This does the conversion, and can be used as a constant initializer.
808 #define to_cpumask(bitmap) \
809 ((struct cpumask *)(1 ? (bitmap) \
810 : (void *)sizeof(__check_is_bitmap(bitmap))))
812 static inline int __check_is_bitmap(const unsigned long *bitmap)
818 * Special-case data structure for "single bit set only" constant CPU masks.
820 * We pre-generate all the 64 (or 32) possible bit positions, with enough
821 * padding to the left and the right, and return the constant pointer
822 * appropriately offset.
824 extern const unsigned long
825 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
827 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
829 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
830 p -= cpu / BITS_PER_LONG;
831 return to_cpumask(p);
834 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
836 #if NR_CPUS <= BITS_PER_LONG
837 #define CPU_BITS_ALL \
839 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
842 #else /* NR_CPUS > BITS_PER_LONG */
844 #define CPU_BITS_ALL \
846 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
847 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
849 #endif /* NR_CPUS > BITS_PER_LONG */
852 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
853 * as comma-separated list of cpus or hex values of cpumask
854 * @list: indicates whether the cpumap must be list
855 * @mask: the cpumask to copy
856 * @buf: the buffer to copy into
858 * Returns the length of the (null-terminated) @buf string, zero if
861 static inline ssize_t
862 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
864 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
868 #if NR_CPUS <= BITS_PER_LONG
869 #define CPU_MASK_ALL \
871 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
874 #define CPU_MASK_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 */
881 #define CPU_MASK_NONE \
883 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
886 #define CPU_MASK_CPU0 \
891 #endif /* __LINUX_CPUMASK_H */