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)), \
220 * for_each_cpu_and - iterate over every cpu in both masks
221 * @cpu: the (optionally unsigned) integer iterator
222 * @mask: the first cpumask pointer
223 * @and: the second cpumask pointer
225 * This saves a temporary CPU mask in many places. It is equivalent to:
226 * struct cpumask tmp;
227 * cpumask_and(&tmp, &mask, &and);
228 * for_each_cpu(cpu, &tmp)
231 * After the loop, cpu is >= nr_cpu_ids.
233 #define for_each_cpu_and(cpu, mask, and) \
235 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
239 #define CPU_BITS_NONE \
241 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
244 #define CPU_BITS_CPU0 \
250 * cpumask_set_cpu - set a cpu in a cpumask
251 * @cpu: cpu number (< nr_cpu_ids)
252 * @dstp: the cpumask pointer
254 static inline void cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
256 set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
260 * cpumask_clear_cpu - clear a cpu in a cpumask
261 * @cpu: cpu number (< nr_cpu_ids)
262 * @dstp: the cpumask pointer
264 static inline void cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
266 clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
270 * cpumask_test_cpu - test for a cpu in a cpumask
271 * @cpu: cpu number (< nr_cpu_ids)
272 * @cpumask: the cpumask pointer
274 * No static inline type checking - see Subtlety (1) above.
276 #define cpumask_test_cpu(cpu, cpumask) \
277 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
280 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
281 * @cpu: cpu number (< nr_cpu_ids)
282 * @cpumask: the cpumask pointer
284 * test_and_set_bit wrapper for cpumasks.
286 static inline int cpumask_test_and_set_cpu(int cpu
, struct cpumask
*cpumask
)
288 return test_and_set_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
292 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
293 * @cpu: cpu number (< nr_cpu_ids)
294 * @cpumask: the cpumask pointer
296 * test_and_clear_bit wrapper for cpumasks.
298 static inline int cpumask_test_and_clear_cpu(int cpu
, struct cpumask
*cpumask
)
300 return test_and_clear_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
304 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
305 * @dstp: the cpumask pointer
307 static inline void cpumask_setall(struct cpumask
*dstp
)
309 bitmap_fill(cpumask_bits(dstp
), nr_cpumask_bits
);
313 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
314 * @dstp: the cpumask pointer
316 static inline void cpumask_clear(struct cpumask
*dstp
)
318 bitmap_zero(cpumask_bits(dstp
), nr_cpumask_bits
);
322 * cpumask_and - *dstp = *src1p & *src2p
323 * @dstp: the cpumask result
324 * @src1p: the first input
325 * @src2p: the second input
327 static inline int cpumask_and(struct cpumask
*dstp
,
328 const struct cpumask
*src1p
,
329 const struct cpumask
*src2p
)
331 return bitmap_and(cpumask_bits(dstp
), cpumask_bits(src1p
),
332 cpumask_bits(src2p
), nr_cpumask_bits
);
336 * cpumask_or - *dstp = *src1p | *src2p
337 * @dstp: the cpumask result
338 * @src1p: the first input
339 * @src2p: the second input
341 static inline void cpumask_or(struct cpumask
*dstp
, const struct cpumask
*src1p
,
342 const struct cpumask
*src2p
)
344 bitmap_or(cpumask_bits(dstp
), cpumask_bits(src1p
),
345 cpumask_bits(src2p
), nr_cpumask_bits
);
349 * cpumask_xor - *dstp = *src1p ^ *src2p
350 * @dstp: the cpumask result
351 * @src1p: the first input
352 * @src2p: the second input
354 static inline void cpumask_xor(struct cpumask
*dstp
,
355 const struct cpumask
*src1p
,
356 const struct cpumask
*src2p
)
358 bitmap_xor(cpumask_bits(dstp
), cpumask_bits(src1p
),
359 cpumask_bits(src2p
), nr_cpumask_bits
);
363 * cpumask_andnot - *dstp = *src1p & ~*src2p
364 * @dstp: the cpumask result
365 * @src1p: the first input
366 * @src2p: the second input
368 static inline int cpumask_andnot(struct cpumask
*dstp
,
369 const struct cpumask
*src1p
,
370 const struct cpumask
*src2p
)
372 return bitmap_andnot(cpumask_bits(dstp
), cpumask_bits(src1p
),
373 cpumask_bits(src2p
), nr_cpumask_bits
);
377 * cpumask_complement - *dstp = ~*srcp
378 * @dstp: the cpumask result
379 * @srcp: the input to invert
381 static inline void cpumask_complement(struct cpumask
*dstp
,
382 const struct cpumask
*srcp
)
384 bitmap_complement(cpumask_bits(dstp
), cpumask_bits(srcp
),
389 * cpumask_equal - *src1p == *src2p
390 * @src1p: the first input
391 * @src2p: the second input
393 static inline bool cpumask_equal(const struct cpumask
*src1p
,
394 const struct cpumask
*src2p
)
396 return bitmap_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
401 * cpumask_intersects - (*src1p & *src2p) != 0
402 * @src1p: the first input
403 * @src2p: the second input
405 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
406 const struct cpumask
*src2p
)
408 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
413 * cpumask_subset - (*src1p & ~*src2p) == 0
414 * @src1p: the first input
415 * @src2p: the second input
417 static inline int cpumask_subset(const struct cpumask
*src1p
,
418 const struct cpumask
*src2p
)
420 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
425 * cpumask_empty - *srcp == 0
426 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
428 static inline bool cpumask_empty(const struct cpumask
*srcp
)
430 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
434 * cpumask_full - *srcp == 0xFFFFFFFF...
435 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
437 static inline bool cpumask_full(const struct cpumask
*srcp
)
439 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
443 * cpumask_weight - Count of bits in *srcp
444 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
446 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
448 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
452 * cpumask_shift_right - *dstp = *srcp >> n
453 * @dstp: the cpumask result
454 * @srcp: the input to shift
455 * @n: the number of bits to shift by
457 static inline void cpumask_shift_right(struct cpumask
*dstp
,
458 const struct cpumask
*srcp
, int n
)
460 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
465 * cpumask_shift_left - *dstp = *srcp << n
466 * @dstp: the cpumask result
467 * @srcp: the input to shift
468 * @n: the number of bits to shift by
470 static inline void cpumask_shift_left(struct cpumask
*dstp
,
471 const struct cpumask
*srcp
, int n
)
473 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
478 * cpumask_copy - *dstp = *srcp
480 * @srcp: the input cpumask
482 static inline void cpumask_copy(struct cpumask
*dstp
,
483 const struct cpumask
*srcp
)
485 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
489 * cpumask_any - pick a "random" cpu from *srcp
490 * @srcp: the input cpumask
492 * Returns >= nr_cpu_ids if no cpus set.
494 #define cpumask_any(srcp) cpumask_first(srcp)
497 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
498 * @src1p: the first input
499 * @src2p: the second input
501 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
503 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
506 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
507 * @mask1: the first input cpumask
508 * @mask2: the second input cpumask
510 * Returns >= nr_cpu_ids if no cpus set.
512 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
515 * cpumask_of - the cpumask containing just a given cpu
516 * @cpu: the cpu (<= nr_cpu_ids)
518 #define cpumask_of(cpu) (get_cpu_mask(cpu))
521 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
522 * @buf: the buffer to sprintf into
523 * @len: the length of the buffer
524 * @srcp: the cpumask to print
526 * If len is zero, returns zero. Otherwise returns the length of the
527 * (nul-terminated) @buf string.
529 static inline int cpumask_scnprintf(char *buf
, int len
,
530 const struct cpumask
*srcp
)
532 return bitmap_scnprintf(buf
, len
, cpumask_bits(srcp
), nr_cpumask_bits
);
536 * cpumask_parse_user - extract a cpumask from a user string
537 * @buf: the buffer to extract from
538 * @len: the length of the buffer
539 * @dstp: the cpumask to set.
541 * Returns -errno, or 0 for success.
543 static inline int cpumask_parse_user(const char __user
*buf
, int len
,
544 struct cpumask
*dstp
)
546 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
550 * cpumask_parselist_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_parselist_user(const char __user
*buf
, int len
,
558 struct cpumask
*dstp
)
560 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
565 * cpulist_scnprintf - print a cpumask into a string as comma-separated list
566 * @buf: the buffer to sprintf into
567 * @len: the length of the buffer
568 * @srcp: the cpumask to print
570 * If len is zero, returns zero. Otherwise returns the length of the
571 * (nul-terminated) @buf string.
573 static inline int cpulist_scnprintf(char *buf
, int len
,
574 const struct cpumask
*srcp
)
576 return bitmap_scnlistprintf(buf
, len
, cpumask_bits(srcp
),
581 * cpulist_parse_user - extract a cpumask from a user string of ranges
582 * @buf: the buffer to extract from
583 * @len: the length of the buffer
584 * @dstp: the cpumask to set.
586 * Returns -errno, or 0 for success.
588 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
590 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpumask_bits
);
594 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
596 * This will eventually be a runtime variable, depending on nr_cpu_ids.
598 static inline size_t cpumask_size(void)
600 /* FIXME: Once all cpumask assignments are eliminated, this
601 * can be nr_cpumask_bits */
602 return BITS_TO_LONGS(NR_CPUS
) * sizeof(long);
606 * cpumask_var_t: struct cpumask for stack usage.
608 * Oh, the wicked games we play! In order to make kernel coding a
609 * little more difficult, we typedef cpumask_var_t to an array or a
610 * pointer: doing &mask on an array is a noop, so it still works.
613 * cpumask_var_t tmpmask;
614 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
617 * ... use 'tmpmask' like a normal struct cpumask * ...
619 * free_cpumask_var(tmpmask);
622 * However, one notable exception is there. alloc_cpumask_var() allocates
623 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
624 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
626 * cpumask_var_t tmpmask;
627 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
632 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
633 * cpumask_copy() provide safe copy functionality.
635 #ifdef CONFIG_CPUMASK_OFFSTACK
636 typedef struct cpumask
*cpumask_var_t
;
638 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
639 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
640 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
641 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
642 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
643 void free_cpumask_var(cpumask_var_t mask
);
644 void free_bootmem_cpumask_var(cpumask_var_t mask
);
647 typedef struct cpumask cpumask_var_t
[1];
649 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
654 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
660 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
662 cpumask_clear(*mask
);
666 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
669 cpumask_clear(*mask
);
673 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
677 static inline void free_cpumask_var(cpumask_var_t mask
)
681 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
684 #endif /* CONFIG_CPUMASK_OFFSTACK */
686 /* It's common to want to use cpu_all_mask in struct member initializers,
687 * so it has to refer to an address rather than a pointer. */
688 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
689 #define cpu_all_mask to_cpumask(cpu_all_bits)
691 /* First bits of cpu_bit_bitmap are in fact unset. */
692 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
694 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
695 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
696 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
698 /* Wrappers for arch boot code to manipulate normally-constant masks */
699 void set_cpu_possible(unsigned int cpu
, bool possible
);
700 void set_cpu_present(unsigned int cpu
, bool present
);
701 void set_cpu_online(unsigned int cpu
, bool online
);
702 void set_cpu_active(unsigned int cpu
, bool active
);
703 void init_cpu_present(const struct cpumask
*src
);
704 void init_cpu_possible(const struct cpumask
*src
);
705 void init_cpu_online(const struct cpumask
*src
);
708 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
709 * @bitmap: the bitmap
711 * There are a few places where cpumask_var_t isn't appropriate and
712 * static cpumasks must be used (eg. very early boot), yet we don't
713 * expose the definition of 'struct cpumask'.
715 * This does the conversion, and can be used as a constant initializer.
717 #define to_cpumask(bitmap) \
718 ((struct cpumask *)(1 ? (bitmap) \
719 : (void *)sizeof(__check_is_bitmap(bitmap))))
721 static inline int __check_is_bitmap(const unsigned long *bitmap
)
727 * Special-case data structure for "single bit set only" constant CPU masks.
729 * We pre-generate all the 64 (or 32) possible bit positions, with enough
730 * padding to the left and the right, and return the constant pointer
731 * appropriately offset.
733 extern const unsigned long
734 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
736 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
738 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
739 p
-= cpu
/ BITS_PER_LONG
;
740 return to_cpumask(p
);
743 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
745 #if NR_CPUS <= BITS_PER_LONG
746 #define CPU_BITS_ALL \
748 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
751 #else /* NR_CPUS > BITS_PER_LONG */
753 #define CPU_BITS_ALL \
755 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
756 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
758 #endif /* NR_CPUS > BITS_PER_LONG */
762 * From here down, all obsolete. Use cpumask_ variants!
765 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
766 /* These strip const, as traditionally they weren't const. */
767 #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
768 #define cpu_online_map (*(cpumask_t *)cpu_online_mask)
769 #define cpu_present_map (*(cpumask_t *)cpu_present_mask)
770 #define cpu_active_map (*(cpumask_t *)cpu_active_mask)
772 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
774 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
776 #if NR_CPUS <= BITS_PER_LONG
778 #define CPU_MASK_ALL \
780 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
785 #define CPU_MASK_ALL \
787 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
788 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
793 #define CPU_MASK_NONE \
795 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
798 #define CPU_MASK_CPU0 \
804 #define first_cpu(src) ({ (void)(src); 0; })
805 #define next_cpu(n, src) ({ (void)(src); 1; })
806 #define any_online_cpu(mask) 0
807 #define for_each_cpu_mask(cpu, mask) \
808 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
809 #else /* NR_CPUS > 1 */
810 int __first_cpu(const cpumask_t
*srcp
);
811 int __next_cpu(int n
, const cpumask_t
*srcp
);
812 int __any_online_cpu(const cpumask_t
*mask
);
814 #define first_cpu(src) __first_cpu(&(src))
815 #define next_cpu(n, src) __next_cpu((n), &(src))
816 #define any_online_cpu(mask) __any_online_cpu(&(mask))
817 #define for_each_cpu_mask(cpu, mask) \
819 (cpu) = next_cpu((cpu), (mask)), \
825 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
827 #else /* NR_CPUS > 64 */
829 int __next_cpu_nr(int n
, const cpumask_t
*srcp
);
830 #define for_each_cpu_mask_nr(cpu, mask) \
832 (cpu) = __next_cpu_nr((cpu), &(mask)), \
833 (cpu) < nr_cpu_ids; )
835 #endif /* NR_CPUS > 64 */
837 #define cpus_addr(src) ((src).bits)
839 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
840 static inline void __cpu_set(int cpu
, volatile cpumask_t
*dstp
)
842 set_bit(cpu
, dstp
->bits
);
845 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
846 static inline void __cpu_clear(int cpu
, volatile cpumask_t
*dstp
)
848 clear_bit(cpu
, dstp
->bits
);
851 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
852 static inline void __cpus_setall(cpumask_t
*dstp
, int nbits
)
854 bitmap_fill(dstp
->bits
, nbits
);
857 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
858 static inline void __cpus_clear(cpumask_t
*dstp
, int nbits
)
860 bitmap_zero(dstp
->bits
, nbits
);
863 /* No static inline type checking - see Subtlety (1) above. */
864 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
866 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
867 static inline int __cpu_test_and_set(int cpu
, cpumask_t
*addr
)
869 return test_and_set_bit(cpu
, addr
->bits
);
872 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
873 static inline int __cpus_and(cpumask_t
*dstp
, const cpumask_t
*src1p
,
874 const cpumask_t
*src2p
, int nbits
)
876 return bitmap_and(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
879 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
880 static inline void __cpus_or(cpumask_t
*dstp
, const cpumask_t
*src1p
,
881 const cpumask_t
*src2p
, int nbits
)
883 bitmap_or(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
886 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
887 static inline void __cpus_xor(cpumask_t
*dstp
, const cpumask_t
*src1p
,
888 const cpumask_t
*src2p
, int nbits
)
890 bitmap_xor(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
893 #define cpus_andnot(dst, src1, src2) \
894 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
895 static inline int __cpus_andnot(cpumask_t
*dstp
, const cpumask_t
*src1p
,
896 const cpumask_t
*src2p
, int nbits
)
898 return bitmap_andnot(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
901 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
902 static inline int __cpus_equal(const cpumask_t
*src1p
,
903 const cpumask_t
*src2p
, int nbits
)
905 return bitmap_equal(src1p
->bits
, src2p
->bits
, nbits
);
908 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
909 static inline int __cpus_intersects(const cpumask_t
*src1p
,
910 const cpumask_t
*src2p
, int nbits
)
912 return bitmap_intersects(src1p
->bits
, src2p
->bits
, nbits
);
915 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
916 static inline int __cpus_subset(const cpumask_t
*src1p
,
917 const cpumask_t
*src2p
, int nbits
)
919 return bitmap_subset(src1p
->bits
, src2p
->bits
, nbits
);
922 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
923 static inline int __cpus_empty(const cpumask_t
*srcp
, int nbits
)
925 return bitmap_empty(srcp
->bits
, nbits
);
928 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
929 static inline int __cpus_weight(const cpumask_t
*srcp
, int nbits
)
931 return bitmap_weight(srcp
->bits
, nbits
);
934 #define cpus_shift_left(dst, src, n) \
935 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
936 static inline void __cpus_shift_left(cpumask_t
*dstp
,
937 const cpumask_t
*srcp
, int n
, int nbits
)
939 bitmap_shift_left(dstp
->bits
, srcp
->bits
, n
, nbits
);
941 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
943 #endif /* __LINUX_CPUMASK_H */
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