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>
13 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
16 * cpumask_bits - get the bits in a cpumask
17 * @maskp: the struct cpumask *
19 * You should only assume nr_cpu_ids bits of this mask are valid. This is
20 * a macro so it's const-correct.
22 #define cpumask_bits(maskp) ((maskp)->bits)
27 extern int nr_cpu_ids;
30 #ifdef CONFIG_CPUMASK_OFFSTACK
31 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
32 * not all bits may be allocated. */
33 #define nr_cpumask_bits nr_cpu_ids
35 #define nr_cpumask_bits NR_CPUS
39 * The following particular system cpumasks and operations manage
40 * possible, present, active and online cpus.
42 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
43 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
44 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
45 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
47 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
49 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
50 * that it is possible might ever be plugged in at anytime during the
51 * life of that system boot. The cpu_present_mask is dynamic(*),
52 * representing which CPUs are currently plugged in. And
53 * cpu_online_mask is the dynamic subset of cpu_present_mask,
54 * indicating those CPUs available for scheduling.
56 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
57 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
58 * ACPI reports present at boot.
60 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
61 * depending on what ACPI reports as currently plugged in, otherwise
62 * cpu_present_mask is just a copy of cpu_possible_mask.
64 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
65 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
68 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
69 * assumption that their single CPU is online. The UP
70 * cpu_{online,possible,present}_masks are placebos. Changing them
71 * will have no useful affect on the following num_*_cpus()
72 * and cpu_*() macros in the UP case. This ugliness is a UP
73 * optimization - don't waste any instructions or memory references
74 * asking if you're online or how many CPUs there are if there is
78 extern const struct cpumask *const cpu_possible_mask;
79 extern const struct cpumask *const cpu_online_mask;
80 extern const struct cpumask *const cpu_present_mask;
81 extern const struct cpumask *const cpu_active_mask;
84 #define num_online_cpus() cpumask_weight(cpu_online_mask)
85 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
86 #define num_present_cpus() cpumask_weight(cpu_present_mask)
87 #define num_active_cpus() cpumask_weight(cpu_active_mask)
88 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
89 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
90 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
91 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
93 #define num_online_cpus() 1U
94 #define num_possible_cpus() 1U
95 #define num_present_cpus() 1U
96 #define num_active_cpus() 1U
97 #define cpu_online(cpu) ((cpu) == 0)
98 #define cpu_possible(cpu) ((cpu) == 0)
99 #define cpu_present(cpu) ((cpu) == 0)
100 #define cpu_active(cpu) ((cpu) == 0)
103 /* verify cpu argument to cpumask_* operators */
104 static inline unsigned int cpumask_check(unsigned int cpu)
106 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
107 WARN_ON_ONCE(cpu >= nr_cpumask_bits);
108 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
113 /* Uniprocessor. Assume all masks are "1". */
114 static inline unsigned int cpumask_first(const struct cpumask *srcp)
119 /* Valid inputs for n are -1 and 0. */
120 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
125 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
130 static inline unsigned int cpumask_next_and(int n,
131 const struct cpumask *srcp,
132 const struct cpumask *andp)
137 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
138 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
144 #define for_each_cpu(cpu, mask) \
145 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
146 #define for_each_cpu_not(cpu, mask) \
147 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
148 #define for_each_cpu_and(cpu, mask, and) \
149 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
152 * cpumask_first - get the first cpu in a cpumask
153 * @srcp: the cpumask pointer
155 * Returns >= nr_cpu_ids if no cpus set.
157 static inline unsigned int cpumask_first(const struct cpumask *srcp)
159 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
163 * cpumask_next - get the next cpu in a cpumask
164 * @n: the cpu prior to the place to search (ie. return will be > @n)
165 * @srcp: the cpumask pointer
167 * Returns >= nr_cpu_ids if no further cpus set.
169 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
171 /* -1 is a legal arg here. */
174 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
178 * cpumask_next_zero - get the next unset cpu in a cpumask
179 * @n: the cpu prior to the place to search (ie. return will be > @n)
180 * @srcp: the cpumask pointer
182 * Returns >= nr_cpu_ids if no further cpus unset.
184 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
186 /* -1 is a legal arg here. */
189 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
192 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *);
193 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu);
196 * for_each_cpu - iterate over every cpu in a mask
197 * @cpu: the (optionally unsigned) integer iterator
198 * @mask: the cpumask pointer
200 * After the loop, cpu is >= nr_cpu_ids.
202 #define for_each_cpu(cpu, mask) \
204 (cpu) = cpumask_next((cpu), (mask)), \
208 * for_each_cpu_not - iterate over every cpu in a complemented mask
209 * @cpu: the (optionally unsigned) integer iterator
210 * @mask: the cpumask pointer
212 * After the loop, cpu is >= nr_cpu_ids.
214 #define for_each_cpu_not(cpu, mask) \
216 (cpu) = cpumask_next_zero((cpu), (mask)), \
219 extern int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap);
222 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
223 * @cpu: the (optionally unsigned) integer iterator
224 * @mask: the cpumask poiter
225 * @start: the start location
227 * The implementation does not assume any bit in @mask is set (including @start).
229 * After the loop, cpu is >= nr_cpu_ids.
231 #define for_each_cpu_wrap(cpu, mask, start) \
232 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
233 (cpu) < nr_cpumask_bits; \
234 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
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 * No static inline type checking - see Subtlety (1) above.
293 #define cpumask_test_cpu(cpu, cpumask) \
294 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
297 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
298 * @cpu: cpu number (< nr_cpu_ids)
299 * @cpumask: the cpumask pointer
301 * test_and_set_bit wrapper for cpumasks.
303 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
305 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
309 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
310 * @cpu: cpu number (< nr_cpu_ids)
311 * @cpumask: the cpumask pointer
313 * test_and_clear_bit wrapper for cpumasks.
315 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
317 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
321 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
322 * @dstp: the cpumask pointer
324 static inline void cpumask_setall(struct cpumask *dstp)
326 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
330 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
331 * @dstp: the cpumask pointer
333 static inline void cpumask_clear(struct cpumask *dstp)
335 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
339 * cpumask_and - *dstp = *src1p & *src2p
340 * @dstp: the cpumask result
341 * @src1p: the first input
342 * @src2p: the second input
344 static inline int cpumask_and(struct cpumask *dstp,
345 const struct cpumask *src1p,
346 const struct cpumask *src2p)
348 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
349 cpumask_bits(src2p), nr_cpumask_bits);
353 * cpumask_or - *dstp = *src1p | *src2p
354 * @dstp: the cpumask result
355 * @src1p: the first input
356 * @src2p: the second input
358 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
359 const struct cpumask *src2p)
361 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
362 cpumask_bits(src2p), nr_cpumask_bits);
366 * cpumask_xor - *dstp = *src1p ^ *src2p
367 * @dstp: the cpumask result
368 * @src1p: the first input
369 * @src2p: the second input
371 static inline void cpumask_xor(struct cpumask *dstp,
372 const struct cpumask *src1p,
373 const struct cpumask *src2p)
375 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
376 cpumask_bits(src2p), nr_cpumask_bits);
380 * cpumask_andnot - *dstp = *src1p & ~*src2p
381 * @dstp: the cpumask result
382 * @src1p: the first input
383 * @src2p: the second input
385 static inline int cpumask_andnot(struct cpumask *dstp,
386 const struct cpumask *src1p,
387 const struct cpumask *src2p)
389 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
390 cpumask_bits(src2p), nr_cpumask_bits);
394 * cpumask_complement - *dstp = ~*srcp
395 * @dstp: the cpumask result
396 * @srcp: the input to invert
398 static inline void cpumask_complement(struct cpumask *dstp,
399 const struct cpumask *srcp)
401 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
406 * cpumask_equal - *src1p == *src2p
407 * @src1p: the first input
408 * @src2p: the second input
410 static inline bool cpumask_equal(const struct cpumask *src1p,
411 const struct cpumask *src2p)
413 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
418 * cpumask_intersects - (*src1p & *src2p) != 0
419 * @src1p: the first input
420 * @src2p: the second input
422 static inline bool cpumask_intersects(const struct cpumask *src1p,
423 const struct cpumask *src2p)
425 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
430 * cpumask_subset - (*src1p & ~*src2p) == 0
431 * @src1p: the first input
432 * @src2p: the second input
434 static inline int cpumask_subset(const struct cpumask *src1p,
435 const struct cpumask *src2p)
437 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
442 * cpumask_empty - *srcp == 0
443 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
445 static inline bool cpumask_empty(const struct cpumask *srcp)
447 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
451 * cpumask_full - *srcp == 0xFFFFFFFF...
452 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
454 static inline bool cpumask_full(const struct cpumask *srcp)
456 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
460 * cpumask_weight - Count of bits in *srcp
461 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
463 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
465 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
469 * cpumask_shift_right - *dstp = *srcp >> n
470 * @dstp: the cpumask result
471 * @srcp: the input to shift
472 * @n: the number of bits to shift by
474 static inline void cpumask_shift_right(struct cpumask *dstp,
475 const struct cpumask *srcp, int n)
477 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
482 * cpumask_shift_left - *dstp = *srcp << n
483 * @dstp: the cpumask result
484 * @srcp: the input to shift
485 * @n: the number of bits to shift by
487 static inline void cpumask_shift_left(struct cpumask *dstp,
488 const struct cpumask *srcp, int n)
490 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
495 * cpumask_copy - *dstp = *srcp
497 * @srcp: the input cpumask
499 static inline void cpumask_copy(struct cpumask *dstp,
500 const struct cpumask *srcp)
502 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
506 * cpumask_any - pick a "random" cpu from *srcp
507 * @srcp: the input cpumask
509 * Returns >= nr_cpu_ids if no cpus set.
511 #define cpumask_any(srcp) cpumask_first(srcp)
514 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
515 * @src1p: the first input
516 * @src2p: the second input
518 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
520 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
523 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
524 * @mask1: the first input cpumask
525 * @mask2: the second input cpumask
527 * Returns >= nr_cpu_ids if no cpus set.
529 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
532 * cpumask_of - the cpumask containing just a given cpu
533 * @cpu: the cpu (<= nr_cpu_ids)
535 #define cpumask_of(cpu) (get_cpu_mask(cpu))
538 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
539 * @buf: the buffer to sprintf into
540 * @len: the length of the buffer
541 * @srcp: the cpumask to print
543 * If len is zero, returns zero. Otherwise returns the length of the
544 * (nul-terminated) @buf string.
546 static inline int cpumask_scnprintf(char *buf, int len,
547 const struct cpumask *srcp)
549 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
553 * cpumask_parse_user - extract a cpumask from a user string
554 * @buf: the buffer to extract from
555 * @len: the length of the buffer
556 * @dstp: the cpumask to set.
558 * Returns -errno, or 0 for success.
560 static inline int cpumask_parse_user(const char __user *buf, int len,
561 struct cpumask *dstp)
563 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
567 * cpumask_parselist_user - extract a cpumask from a user string
568 * @buf: the buffer to extract from
569 * @len: the length of the buffer
570 * @dstp: the cpumask to set.
572 * Returns -errno, or 0 for success.
574 static inline int cpumask_parselist_user(const char __user *buf, int len,
575 struct cpumask *dstp)
577 return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
582 * cpulist_scnprintf - print a cpumask into a string as comma-separated list
583 * @buf: the buffer to sprintf into
584 * @len: the length of the buffer
585 * @srcp: the cpumask to print
587 * If len is zero, returns zero. Otherwise returns the length of the
588 * (nul-terminated) @buf string.
590 static inline int cpulist_scnprintf(char *buf, int len,
591 const struct cpumask *srcp)
593 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
598 * cpulist_parse_user - extract a cpumask from a user string of ranges
599 * @buf: the buffer to extract from
600 * @len: the length of the buffer
601 * @dstp: the cpumask to set.
603 * Returns -errno, or 0 for success.
605 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
607 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
611 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
613 * This will eventually be a runtime variable, depending on nr_cpu_ids.
615 static inline size_t cpumask_size(void)
617 /* FIXME: Once all cpumask assignments are eliminated, this
618 * can be nr_cpumask_bits */
619 return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
623 * cpumask_var_t: struct cpumask for stack usage.
625 * Oh, the wicked games we play! In order to make kernel coding a
626 * little more difficult, we typedef cpumask_var_t to an array or a
627 * pointer: doing &mask on an array is a noop, so it still works.
630 * cpumask_var_t tmpmask;
631 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
634 * ... use 'tmpmask' like a normal struct cpumask * ...
636 * free_cpumask_var(tmpmask);
639 * However, one notable exception is there. alloc_cpumask_var() allocates
640 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
641 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
643 * cpumask_var_t tmpmask;
644 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
649 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
650 * cpumask_copy() provide safe copy functionality.
652 #ifdef CONFIG_CPUMASK_OFFSTACK
653 typedef struct cpumask *cpumask_var_t;
655 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
656 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
657 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
658 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
659 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
660 void free_cpumask_var(cpumask_var_t mask);
661 void free_bootmem_cpumask_var(cpumask_var_t mask);
664 typedef struct cpumask cpumask_var_t[1];
666 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
671 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
677 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
679 cpumask_clear(*mask);
683 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
686 cpumask_clear(*mask);
690 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
694 static inline void free_cpumask_var(cpumask_var_t mask)
698 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
701 #endif /* CONFIG_CPUMASK_OFFSTACK */
703 /* It's common to want to use cpu_all_mask in struct member initializers,
704 * so it has to refer to an address rather than a pointer. */
705 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
706 #define cpu_all_mask to_cpumask(cpu_all_bits)
708 /* First bits of cpu_bit_bitmap are in fact unset. */
709 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
711 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
712 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
713 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
715 /* Wrappers for arch boot code to manipulate normally-constant masks */
716 void set_cpu_possible(unsigned int cpu, bool possible);
717 void set_cpu_present(unsigned int cpu, bool present);
718 void set_cpu_online(unsigned int cpu, bool online);
719 void set_cpu_active(unsigned int cpu, bool active);
720 void init_cpu_present(const struct cpumask *src);
721 void init_cpu_possible(const struct cpumask *src);
722 void init_cpu_online(const struct cpumask *src);
725 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
726 * @bitmap: the bitmap
728 * There are a few places where cpumask_var_t isn't appropriate and
729 * static cpumasks must be used (eg. very early boot), yet we don't
730 * expose the definition of 'struct cpumask'.
732 * This does the conversion, and can be used as a constant initializer.
734 #define to_cpumask(bitmap) \
735 ((struct cpumask *)(1 ? (bitmap) \
736 : (void *)sizeof(__check_is_bitmap(bitmap))))
738 static inline int __check_is_bitmap(const unsigned long *bitmap)
744 * Special-case data structure for "single bit set only" constant CPU masks.
746 * We pre-generate all the 64 (or 32) possible bit positions, with enough
747 * padding to the left and the right, and return the constant pointer
748 * appropriately offset.
750 extern const unsigned long
751 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
753 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
755 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
756 p -= cpu / BITS_PER_LONG;
757 return to_cpumask(p);
760 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
762 #if NR_CPUS <= BITS_PER_LONG
763 #define CPU_BITS_ALL \
765 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
768 #else /* NR_CPUS > BITS_PER_LONG */
770 #define CPU_BITS_ALL \
772 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
773 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
775 #endif /* NR_CPUS > BITS_PER_LONG */
779 * From here down, all obsolete. Use cpumask_ variants!
782 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
783 /* These strip const, as traditionally they weren't const. */
784 #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
785 #define cpu_online_map (*(cpumask_t *)cpu_online_mask)
786 #define cpu_present_map (*(cpumask_t *)cpu_present_mask)
787 #define cpu_active_map (*(cpumask_t *)cpu_active_mask)
789 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
791 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
793 #if NR_CPUS <= BITS_PER_LONG
795 #define CPU_MASK_ALL \
797 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
802 #define CPU_MASK_ALL \
804 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
805 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
810 #define CPU_MASK_NONE \
812 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
815 #define CPU_MASK_CPU0 \
821 #define first_cpu(src) ({ (void)(src); 0; })
822 #define next_cpu(n, src) ({ (void)(src); 1; })
823 #define any_online_cpu(mask) 0
824 #define for_each_cpu_mask(cpu, mask) \
825 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
826 #else /* NR_CPUS > 1 */
827 int __first_cpu(const cpumask_t *srcp);
828 int __next_cpu(int n, const cpumask_t *srcp);
829 int __any_online_cpu(const cpumask_t *mask);
831 #define first_cpu(src) __first_cpu(&(src))
832 #define next_cpu(n, src) __next_cpu((n), &(src))
833 #define any_online_cpu(mask) __any_online_cpu(&(mask))
834 #define for_each_cpu_mask(cpu, mask) \
836 (cpu) = next_cpu((cpu), (mask)), \
842 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
844 #else /* NR_CPUS > 64 */
846 int __next_cpu_nr(int n, const cpumask_t *srcp);
847 #define for_each_cpu_mask_nr(cpu, mask) \
849 (cpu) = __next_cpu_nr((cpu), &(mask)), \
850 (cpu) < nr_cpu_ids; )
852 #endif /* NR_CPUS > 64 */
854 #define cpus_addr(src) ((src).bits)
856 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
857 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
859 set_bit(cpu, dstp->bits);
862 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
863 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
865 clear_bit(cpu, dstp->bits);
868 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
869 static inline void __cpus_setall(cpumask_t *dstp, int nbits)
871 bitmap_fill(dstp->bits, nbits);
874 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
875 static inline void __cpus_clear(cpumask_t *dstp, int nbits)
877 bitmap_zero(dstp->bits, nbits);
880 /* No static inline type checking - see Subtlety (1) above. */
881 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
883 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
884 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
886 return test_and_set_bit(cpu, addr->bits);
889 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
890 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
891 const cpumask_t *src2p, int nbits)
893 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
896 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
897 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
898 const cpumask_t *src2p, int nbits)
900 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
903 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
904 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
905 const cpumask_t *src2p, int nbits)
907 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
910 #define cpus_andnot(dst, src1, src2) \
911 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
912 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
913 const cpumask_t *src2p, int nbits)
915 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
918 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
919 static inline int __cpus_equal(const cpumask_t *src1p,
920 const cpumask_t *src2p, int nbits)
922 return bitmap_equal(src1p->bits, src2p->bits, nbits);
925 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
926 static inline int __cpus_intersects(const cpumask_t *src1p,
927 const cpumask_t *src2p, int nbits)
929 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
932 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
933 static inline int __cpus_subset(const cpumask_t *src1p,
934 const cpumask_t *src2p, int nbits)
936 return bitmap_subset(src1p->bits, src2p->bits, nbits);
939 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
940 static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
942 return bitmap_empty(srcp->bits, nbits);
945 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
946 static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
948 return bitmap_weight(srcp->bits, nbits);
951 #define cpus_shift_left(dst, src, n) \
952 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
953 static inline void __cpus_shift_left(cpumask_t *dstp,
954 const cpumask_t *srcp, int n, int nbits)
956 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
958 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
960 #endif /* __LINUX_CPUMASK_H */