1 #ifndef __LINUX_CPUMASK_H
2 #define __LINUX_CPUMASK_H
5 * Cpumasks provide a bitmap suitable for representing the
6 * set of CPU's in a system, one bit position per CPU number. In general,
7 * only nr_cpu_ids (<= NR_CPUS) bits are valid.
9 #include <linux/kernel.h>
10 #include <linux/threads.h>
11 #include <linux/bitmap.h>
12 #include <linux/bug.h>
14 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
17 * cpumask_bits - get the bits in a cpumask
18 * @maskp: the struct cpumask *
20 * You should only assume nr_cpu_ids bits of this mask are valid. This is
21 * a macro so it's const-correct.
23 #define cpumask_bits(maskp) ((maskp)->bits)
26 * cpumask_pr_args - printf args to output a cpumask
27 * @maskp: cpumask to be printed
29 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
31 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
36 extern int nr_cpu_ids;
39 #ifdef CONFIG_CPUMASK_OFFSTACK
40 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
41 * not all bits may be allocated. */
42 #define nr_cpumask_bits nr_cpu_ids
44 #define nr_cpumask_bits NR_CPUS
48 * The following particular system cpumasks and operations manage
49 * possible, present, active and online cpus.
51 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
52 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
53 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
54 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
56 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
58 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
59 * that it is possible might ever be plugged in at anytime during the
60 * life of that system boot. The cpu_present_mask is dynamic(*),
61 * representing which CPUs are currently plugged in. And
62 * cpu_online_mask is the dynamic subset of cpu_present_mask,
63 * indicating those CPUs available for scheduling.
65 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
66 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
67 * ACPI reports present at boot.
69 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
70 * depending on what ACPI reports as currently plugged in, otherwise
71 * cpu_present_mask is just a copy of cpu_possible_mask.
73 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
74 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
77 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
78 * assumption that their single CPU is online. The UP
79 * cpu_{online,possible,present}_masks are placebos. Changing them
80 * will have no useful affect on the following num_*_cpus()
81 * and cpu_*() macros in the UP case. This ugliness is a UP
82 * optimization - don't waste any instructions or memory references
83 * asking if you're online or how many CPUs there are if there is
87 extern const struct cpumask *const cpu_possible_mask;
88 extern const struct cpumask *const cpu_online_mask;
89 extern const struct cpumask *const cpu_present_mask;
90 extern const struct cpumask *const cpu_active_mask;
93 #define num_online_cpus() cpumask_weight(cpu_online_mask)
94 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
95 #define num_present_cpus() cpumask_weight(cpu_present_mask)
96 #define num_active_cpus() cpumask_weight(cpu_active_mask)
97 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
98 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
99 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
100 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
102 #define num_online_cpus() 1U
103 #define num_possible_cpus() 1U
104 #define num_present_cpus() 1U
105 #define num_active_cpus() 1U
106 #define cpu_online(cpu) ((cpu) == 0)
107 #define cpu_possible(cpu) ((cpu) == 0)
108 #define cpu_present(cpu) ((cpu) == 0)
109 #define cpu_active(cpu) ((cpu) == 0)
112 /* verify cpu argument to cpumask_* operators */
113 static inline unsigned int cpumask_check(unsigned int cpu)
115 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
116 WARN_ON_ONCE(cpu >= nr_cpumask_bits);
117 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
122 /* Uniprocessor. Assume all masks are "1". */
123 static inline unsigned int cpumask_first(const struct cpumask *srcp)
128 /* Valid inputs for n are -1 and 0. */
129 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
134 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
139 static inline unsigned int cpumask_next_and(int n,
140 const struct cpumask *srcp,
141 const struct cpumask *andp)
146 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
147 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
153 static inline int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp)
155 set_bit(0, cpumask_bits(dstp));
160 #define for_each_cpu(cpu, mask) \
161 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
162 #define for_each_cpu_not(cpu, mask) \
163 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
164 #define for_each_cpu_and(cpu, mask, and) \
165 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
168 * cpumask_first - get the first cpu in a cpumask
169 * @srcp: the cpumask pointer
171 * Returns >= nr_cpu_ids if no cpus set.
173 static inline unsigned int cpumask_first(const struct cpumask *srcp)
175 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
179 * cpumask_next - get the next cpu in a cpumask
180 * @n: the cpu prior to the place to search (ie. return will be > @n)
181 * @srcp: the cpumask pointer
183 * Returns >= nr_cpu_ids if no further cpus set.
185 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
187 /* -1 is a legal arg here. */
190 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
194 * cpumask_next_zero - get the next unset cpu in a cpumask
195 * @n: the cpu prior to the place to search (ie. return will be > @n)
196 * @srcp: the cpumask pointer
198 * Returns >= nr_cpu_ids if no further cpus unset.
200 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
202 /* -1 is a legal arg here. */
205 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
208 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
209 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
210 int cpumask_set_cpu_local_first(int i, int numa_node, cpumask_t *dstp);
213 * for_each_cpu - iterate over every cpu in a mask
214 * @cpu: the (optionally unsigned) integer iterator
215 * @mask: the cpumask pointer
217 * After the loop, cpu is >= nr_cpu_ids.
219 #define for_each_cpu(cpu, mask) \
221 (cpu) = cpumask_next((cpu), (mask)), \
225 * for_each_cpu_not - iterate over every cpu in a complemented mask
226 * @cpu: the (optionally unsigned) integer iterator
227 * @mask: the cpumask pointer
229 * After the loop, cpu is >= nr_cpu_ids.
231 #define for_each_cpu_not(cpu, mask) \
233 (cpu) = cpumask_next_zero((cpu), (mask)), \
237 * for_each_cpu_and - iterate over every cpu in both masks
238 * @cpu: the (optionally unsigned) integer iterator
239 * @mask: the first cpumask pointer
240 * @and: the second cpumask pointer
242 * This saves a temporary CPU mask in many places. It is equivalent to:
243 * struct cpumask tmp;
244 * cpumask_and(&tmp, &mask, &and);
245 * for_each_cpu(cpu, &tmp)
248 * After the loop, cpu is >= nr_cpu_ids.
250 #define for_each_cpu_and(cpu, mask, and) \
252 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
256 #define CPU_BITS_NONE \
258 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
261 #define CPU_BITS_CPU0 \
267 * cpumask_set_cpu - set a cpu in a cpumask
268 * @cpu: cpu number (< nr_cpu_ids)
269 * @dstp: the cpumask pointer
271 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
273 set_bit(cpumask_check(cpu), cpumask_bits(dstp));
277 * cpumask_clear_cpu - clear a cpu in a cpumask
278 * @cpu: cpu number (< nr_cpu_ids)
279 * @dstp: the cpumask pointer
281 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
283 clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
287 * cpumask_test_cpu - test for a cpu in a cpumask
288 * @cpu: cpu number (< nr_cpu_ids)
289 * @cpumask: the cpumask pointer
291 * Returns 1 if @cpu is set in @cpumask, else returns 0
293 * No static inline type checking - see Subtlety (1) above.
295 #define cpumask_test_cpu(cpu, cpumask) \
296 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
299 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
300 * @cpu: cpu number (< nr_cpu_ids)
301 * @cpumask: the cpumask pointer
303 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
305 * test_and_set_bit wrapper for cpumasks.
307 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
309 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
313 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
314 * @cpu: cpu number (< nr_cpu_ids)
315 * @cpumask: the cpumask pointer
317 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
319 * test_and_clear_bit wrapper for cpumasks.
321 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
323 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
327 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
328 * @dstp: the cpumask pointer
330 static inline void cpumask_setall(struct cpumask *dstp)
332 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
336 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
337 * @dstp: the cpumask pointer
339 static inline void cpumask_clear(struct cpumask *dstp)
341 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
345 * cpumask_and - *dstp = *src1p & *src2p
346 * @dstp: the cpumask result
347 * @src1p: the first input
348 * @src2p: the second input
350 * If *@dstp is empty, returns 0, else returns 1
352 static inline int cpumask_and(struct cpumask *dstp,
353 const struct cpumask *src1p,
354 const struct cpumask *src2p)
356 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
357 cpumask_bits(src2p), nr_cpumask_bits);
361 * cpumask_or - *dstp = *src1p | *src2p
362 * @dstp: the cpumask result
363 * @src1p: the first input
364 * @src2p: the second input
366 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
367 const struct cpumask *src2p)
369 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
370 cpumask_bits(src2p), nr_cpumask_bits);
374 * cpumask_xor - *dstp = *src1p ^ *src2p
375 * @dstp: the cpumask result
376 * @src1p: the first input
377 * @src2p: the second input
379 static inline void cpumask_xor(struct cpumask *dstp,
380 const struct cpumask *src1p,
381 const struct cpumask *src2p)
383 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
384 cpumask_bits(src2p), nr_cpumask_bits);
388 * cpumask_andnot - *dstp = *src1p & ~*src2p
389 * @dstp: the cpumask result
390 * @src1p: the first input
391 * @src2p: the second input
393 * If *@dstp is empty, returns 0, else returns 1
395 static inline int cpumask_andnot(struct cpumask *dstp,
396 const struct cpumask *src1p,
397 const struct cpumask *src2p)
399 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
400 cpumask_bits(src2p), nr_cpumask_bits);
404 * cpumask_complement - *dstp = ~*srcp
405 * @dstp: the cpumask result
406 * @srcp: the input to invert
408 static inline void cpumask_complement(struct cpumask *dstp,
409 const struct cpumask *srcp)
411 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
416 * cpumask_equal - *src1p == *src2p
417 * @src1p: the first input
418 * @src2p: the second input
420 static inline bool cpumask_equal(const struct cpumask *src1p,
421 const struct cpumask *src2p)
423 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
428 * cpumask_intersects - (*src1p & *src2p) != 0
429 * @src1p: the first input
430 * @src2p: the second input
432 static inline bool cpumask_intersects(const struct cpumask *src1p,
433 const struct cpumask *src2p)
435 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
440 * cpumask_subset - (*src1p & ~*src2p) == 0
441 * @src1p: the first input
442 * @src2p: the second input
444 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
446 static inline int cpumask_subset(const struct cpumask *src1p,
447 const struct cpumask *src2p)
449 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
454 * cpumask_empty - *srcp == 0
455 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
457 static inline bool cpumask_empty(const struct cpumask *srcp)
459 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
463 * cpumask_full - *srcp == 0xFFFFFFFF...
464 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
466 static inline bool cpumask_full(const struct cpumask *srcp)
468 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
472 * cpumask_weight - Count of bits in *srcp
473 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
475 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
477 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
481 * cpumask_shift_right - *dstp = *srcp >> n
482 * @dstp: the cpumask result
483 * @srcp: the input to shift
484 * @n: the number of bits to shift by
486 static inline void cpumask_shift_right(struct cpumask *dstp,
487 const struct cpumask *srcp, int n)
489 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
494 * cpumask_shift_left - *dstp = *srcp << n
495 * @dstp: the cpumask result
496 * @srcp: the input to shift
497 * @n: the number of bits to shift by
499 static inline void cpumask_shift_left(struct cpumask *dstp,
500 const struct cpumask *srcp, int n)
502 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
507 * cpumask_copy - *dstp = *srcp
509 * @srcp: the input cpumask
511 static inline void cpumask_copy(struct cpumask *dstp,
512 const struct cpumask *srcp)
514 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
518 * cpumask_any - pick a "random" cpu from *srcp
519 * @srcp: the input cpumask
521 * Returns >= nr_cpu_ids if no cpus set.
523 #define cpumask_any(srcp) cpumask_first(srcp)
526 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
527 * @src1p: the first input
528 * @src2p: the second input
530 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
532 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
535 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
536 * @mask1: the first input cpumask
537 * @mask2: the second input cpumask
539 * Returns >= nr_cpu_ids if no cpus set.
541 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
544 * cpumask_of - the cpumask containing just a given cpu
545 * @cpu: the cpu (<= nr_cpu_ids)
547 #define cpumask_of(cpu) (get_cpu_mask(cpu))
550 * cpumask_parse_user - extract a cpumask from a user string
551 * @buf: the buffer to extract from
552 * @len: the length of the buffer
553 * @dstp: the cpumask to set.
555 * Returns -errno, or 0 for success.
557 static inline int cpumask_parse_user(const char __user *buf, int len,
558 struct cpumask *dstp)
560 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpu_ids);
564 * cpumask_parselist_user - extract a cpumask from a user string
565 * @buf: the buffer to extract from
566 * @len: the length of the buffer
567 * @dstp: the cpumask to set.
569 * Returns -errno, or 0 for success.
571 static inline int cpumask_parselist_user(const char __user *buf, int len,
572 struct cpumask *dstp)
574 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
579 * cpumask_parse - extract a cpumask from from a string
580 * @buf: the buffer to extract from
581 * @dstp: the cpumask to set.
583 * Returns -errno, or 0 for success.
585 static inline int cpumask_parse(const char *buf, struct cpumask *dstp)
587 char *nl = strchr(buf, '\n');
588 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf);
590 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpu_ids);
594 * cpulist_parse - extract a cpumask from a user string of ranges
595 * @buf: the buffer to extract from
596 * @dstp: the cpumask to set.
598 * Returns -errno, or 0 for success.
600 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
602 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpu_ids);
606 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
608 * This will eventually be a runtime variable, depending on nr_cpu_ids.
610 static inline size_t cpumask_size(void)
612 /* FIXME: Once all cpumask assignments are eliminated, this
613 * can be nr_cpumask_bits */
614 return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
618 * cpumask_var_t: struct cpumask for stack usage.
620 * Oh, the wicked games we play! In order to make kernel coding a
621 * little more difficult, we typedef cpumask_var_t to an array or a
622 * pointer: doing &mask on an array is a noop, so it still works.
625 * cpumask_var_t tmpmask;
626 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
629 * ... use 'tmpmask' like a normal struct cpumask * ...
631 * free_cpumask_var(tmpmask);
634 * However, one notable exception is there. alloc_cpumask_var() allocates
635 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
636 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
638 * cpumask_var_t tmpmask;
639 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
644 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
645 * cpumask_copy() provide safe copy functionality.
647 * Note that there is another evil here: If you define a cpumask_var_t
648 * as a percpu variable then the way to obtain the address of the cpumask
649 * structure differently influences what this_cpu_* operation needs to be
650 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
651 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
652 * other type of cpumask_var_t implementation is configured.
654 #ifdef CONFIG_CPUMASK_OFFSTACK
655 typedef struct cpumask *cpumask_var_t;
657 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
659 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
660 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
661 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
662 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
663 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
664 void free_cpumask_var(cpumask_var_t mask);
665 void free_bootmem_cpumask_var(cpumask_var_t mask);
668 typedef struct cpumask cpumask_var_t[1];
670 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
672 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
677 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
683 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
685 cpumask_clear(*mask);
689 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
692 cpumask_clear(*mask);
696 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
700 static inline void free_cpumask_var(cpumask_var_t mask)
704 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
707 #endif /* CONFIG_CPUMASK_OFFSTACK */
709 /* It's common to want to use cpu_all_mask in struct member initializers,
710 * so it has to refer to an address rather than a pointer. */
711 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
712 #define cpu_all_mask to_cpumask(cpu_all_bits)
714 /* First bits of cpu_bit_bitmap are in fact unset. */
715 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
717 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
718 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
719 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
721 /* Wrappers for arch boot code to manipulate normally-constant masks */
722 void set_cpu_possible(unsigned int cpu, bool possible);
723 void set_cpu_present(unsigned int cpu, bool present);
724 void set_cpu_online(unsigned int cpu, bool online);
725 void set_cpu_active(unsigned int cpu, bool active);
726 void init_cpu_present(const struct cpumask *src);
727 void init_cpu_possible(const struct cpumask *src);
728 void init_cpu_online(const struct cpumask *src);
731 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
732 * @bitmap: the bitmap
734 * There are a few places where cpumask_var_t isn't appropriate and
735 * static cpumasks must be used (eg. very early boot), yet we don't
736 * expose the definition of 'struct cpumask'.
738 * This does the conversion, and can be used as a constant initializer.
740 #define to_cpumask(bitmap) \
741 ((struct cpumask *)(1 ? (bitmap) \
742 : (void *)sizeof(__check_is_bitmap(bitmap))))
744 static inline int __check_is_bitmap(const unsigned long *bitmap)
750 * Special-case data structure for "single bit set only" constant CPU masks.
752 * We pre-generate all the 64 (or 32) possible bit positions, with enough
753 * padding to the left and the right, and return the constant pointer
754 * appropriately offset.
756 extern const unsigned long
757 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
759 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
761 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
762 p -= cpu / BITS_PER_LONG;
763 return to_cpumask(p);
766 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
768 #if NR_CPUS <= BITS_PER_LONG
769 #define CPU_BITS_ALL \
771 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
774 #else /* NR_CPUS > BITS_PER_LONG */
776 #define CPU_BITS_ALL \
778 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
779 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
781 #endif /* NR_CPUS > BITS_PER_LONG */
784 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
785 * as comma-separated list of cpus or hex values of cpumask
786 * @list: indicates whether the cpumap must be list
787 * @mask: the cpumask to copy
788 * @buf: the buffer to copy into
790 * Returns the length of the (null-terminated) @buf string, zero if
793 static inline ssize_t
794 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask)
796 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask),
802 * From here down, all obsolete. Use cpumask_ variants!
805 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
806 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
808 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
810 #if NR_CPUS <= BITS_PER_LONG
812 #define CPU_MASK_ALL \
814 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
819 #define CPU_MASK_ALL \
821 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
822 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
827 #define CPU_MASK_NONE \
829 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
832 #define CPU_MASK_CPU0 \
838 #define first_cpu(src) ({ (void)(src); 0; })
839 #define next_cpu(n, src) ({ (void)(src); 1; })
840 #define any_online_cpu(mask) 0
841 #define for_each_cpu_mask(cpu, mask) \
842 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
843 #else /* NR_CPUS > 1 */
844 int __first_cpu(const cpumask_t *srcp);
845 int __next_cpu(int n, const cpumask_t *srcp);
847 #define first_cpu(src) __first_cpu(&(src))
848 #define next_cpu(n, src) __next_cpu((n), &(src))
849 #define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask)
850 #define for_each_cpu_mask(cpu, mask) \
852 (cpu) = next_cpu((cpu), (mask)), \
858 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
860 #else /* NR_CPUS > 64 */
862 int __next_cpu_nr(int n, const cpumask_t *srcp);
863 #define for_each_cpu_mask_nr(cpu, mask) \
865 (cpu) = __next_cpu_nr((cpu), &(mask)), \
866 (cpu) < nr_cpu_ids; )
868 #endif /* NR_CPUS > 64 */
870 #define cpus_addr(src) ((src).bits)
872 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
873 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
875 set_bit(cpu, dstp->bits);
878 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
879 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
881 clear_bit(cpu, dstp->bits);
884 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
885 static inline void __cpus_setall(cpumask_t *dstp, unsigned int nbits)
887 bitmap_fill(dstp->bits, nbits);
890 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
891 static inline void __cpus_clear(cpumask_t *dstp, unsigned int nbits)
893 bitmap_zero(dstp->bits, nbits);
896 /* No static inline type checking - see Subtlety (1) above. */
897 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
899 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
900 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
902 return test_and_set_bit(cpu, addr->bits);
905 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
906 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
907 const cpumask_t *src2p, unsigned int nbits)
909 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
912 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
913 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
914 const cpumask_t *src2p, unsigned int nbits)
916 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
919 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
920 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
921 const cpumask_t *src2p, unsigned int nbits)
923 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
926 #define cpus_andnot(dst, src1, src2) \
927 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
928 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
929 const cpumask_t *src2p, unsigned int nbits)
931 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
934 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
935 static inline int __cpus_equal(const cpumask_t *src1p,
936 const cpumask_t *src2p, unsigned int nbits)
938 return bitmap_equal(src1p->bits, src2p->bits, nbits);
941 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
942 static inline int __cpus_intersects(const cpumask_t *src1p,
943 const cpumask_t *src2p, unsigned int nbits)
945 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
948 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
949 static inline int __cpus_subset(const cpumask_t *src1p,
950 const cpumask_t *src2p, unsigned int nbits)
952 return bitmap_subset(src1p->bits, src2p->bits, nbits);
955 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
956 static inline int __cpus_empty(const cpumask_t *srcp, unsigned int nbits)
958 return bitmap_empty(srcp->bits, nbits);
961 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
962 static inline int __cpus_weight(const cpumask_t *srcp, unsigned int nbits)
964 return bitmap_weight(srcp->bits, nbits);
967 #define cpus_shift_left(dst, src, n) \
968 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
969 static inline void __cpus_shift_left(cpumask_t *dstp,
970 const cpumask_t *srcp, int n, int nbits)
972 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
974 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
976 #endif /* __LINUX_CPUMASK_H */