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)
28 extern int nr_cpu_ids
;
31 #ifdef CONFIG_CPUMASK_OFFSTACK
32 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
33 * not all bits may be allocated. */
34 #define nr_cpumask_bits nr_cpu_ids
36 #define nr_cpumask_bits NR_CPUS
40 * The following particular system cpumasks and operations manage
41 * possible, present, active and online cpus.
43 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
44 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
45 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
46 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
48 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
50 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
51 * that it is possible might ever be plugged in at anytime during the
52 * life of that system boot. The cpu_present_mask is dynamic(*),
53 * representing which CPUs are currently plugged in. And
54 * cpu_online_mask is the dynamic subset of cpu_present_mask,
55 * indicating those CPUs available for scheduling.
57 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
58 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
59 * ACPI reports present at boot.
61 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
62 * depending on what ACPI reports as currently plugged in, otherwise
63 * cpu_present_mask is just a copy of cpu_possible_mask.
65 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
66 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
69 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
70 * assumption that their single CPU is online. The UP
71 * cpu_{online,possible,present}_masks are placebos. Changing them
72 * will have no useful affect on the following num_*_cpus()
73 * and cpu_*() macros in the UP case. This ugliness is a UP
74 * optimization - don't waste any instructions or memory references
75 * asking if you're online or how many CPUs there are if there is
79 extern const struct cpumask
*const cpu_possible_mask
;
80 extern const struct cpumask
*const cpu_online_mask
;
81 extern const struct cpumask
*const cpu_present_mask
;
82 extern const struct cpumask
*const cpu_active_mask
;
85 #define num_online_cpus() cpumask_weight(cpu_online_mask)
86 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
87 #define num_present_cpus() cpumask_weight(cpu_present_mask)
88 #define num_active_cpus() cpumask_weight(cpu_active_mask)
89 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
90 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
91 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
92 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
94 #define num_online_cpus() 1U
95 #define num_possible_cpus() 1U
96 #define num_present_cpus() 1U
97 #define num_active_cpus() 1U
98 #define cpu_online(cpu) ((cpu) == 0)
99 #define cpu_possible(cpu) ((cpu) == 0)
100 #define cpu_present(cpu) ((cpu) == 0)
101 #define cpu_active(cpu) ((cpu) == 0)
104 /* verify cpu argument to cpumask_* operators */
105 static inline unsigned int cpumask_check(unsigned int cpu
)
107 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
108 WARN_ON_ONCE(cpu
>= nr_cpumask_bits
);
109 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
114 /* Uniprocessor. Assume all masks are "1". */
115 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
120 /* Valid inputs for n are -1 and 0. */
121 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
126 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
131 static inline unsigned int cpumask_next_and(int n
,
132 const struct cpumask
*srcp
,
133 const struct cpumask
*andp
)
138 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
139 static inline unsigned int cpumask_any_but(const struct cpumask
*mask
,
145 #define for_each_cpu(cpu, mask) \
146 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
147 #define for_each_cpu_not(cpu, mask) \
148 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
149 #define for_each_cpu_and(cpu, mask, and) \
150 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
153 * cpumask_first - get the first cpu in a cpumask
154 * @srcp: the cpumask pointer
156 * Returns >= nr_cpu_ids if no cpus set.
158 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
160 return find_first_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
164 * cpumask_next - get the next cpu in a cpumask
165 * @n: the cpu prior to the place to search (ie. return will be > @n)
166 * @srcp: the cpumask pointer
168 * Returns >= nr_cpu_ids if no further cpus set.
170 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
172 /* -1 is a legal arg here. */
175 return find_next_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
179 * cpumask_next_zero - get the next unset 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 unset.
185 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
187 /* -1 is a legal arg here. */
190 return find_next_zero_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
193 int cpumask_next_and(int n
, const struct cpumask
*, const struct cpumask
*);
194 int cpumask_any_but(const struct cpumask
*mask
, unsigned int cpu
);
197 * for_each_cpu - iterate over every cpu in a mask
198 * @cpu: the (optionally unsigned) integer iterator
199 * @mask: the cpumask pointer
201 * After the loop, cpu is >= nr_cpu_ids.
203 #define for_each_cpu(cpu, mask) \
205 (cpu) = cpumask_next((cpu), (mask)), \
209 * for_each_cpu_not - iterate over every cpu in a complemented mask
210 * @cpu: the (optionally unsigned) integer iterator
211 * @mask: the cpumask pointer
213 * After the loop, cpu is >= nr_cpu_ids.
215 #define for_each_cpu_not(cpu, mask) \
217 (cpu) = cpumask_next_zero((cpu), (mask)), \
221 * for_each_cpu_and - iterate over every cpu in both masks
222 * @cpu: the (optionally unsigned) integer iterator
223 * @mask: the first cpumask pointer
224 * @and: the second cpumask pointer
226 * This saves a temporary CPU mask in many places. It is equivalent to:
227 * struct cpumask tmp;
228 * cpumask_and(&tmp, &mask, &and);
229 * for_each_cpu(cpu, &tmp)
232 * After the loop, cpu is >= nr_cpu_ids.
234 #define for_each_cpu_and(cpu, mask, and) \
236 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
240 #define CPU_BITS_NONE \
242 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
245 #define CPU_BITS_CPU0 \
251 * cpumask_set_cpu - set a cpu in a cpumask
252 * @cpu: cpu number (< nr_cpu_ids)
253 * @dstp: the cpumask pointer
255 static inline void cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
257 set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
261 * cpumask_clear_cpu - clear a cpu in a cpumask
262 * @cpu: cpu number (< nr_cpu_ids)
263 * @dstp: the cpumask pointer
265 static inline void cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
267 clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
271 * cpumask_test_cpu - test for a cpu in a cpumask
272 * @cpu: cpu number (< nr_cpu_ids)
273 * @cpumask: the cpumask pointer
275 * Returns 1 if @cpu is set in @cpumask, else returns 0
277 * No static inline type checking - see Subtlety (1) above.
279 #define cpumask_test_cpu(cpu, cpumask) \
280 test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
283 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
284 * @cpu: cpu number (< nr_cpu_ids)
285 * @cpumask: the cpumask pointer
287 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
289 * test_and_set_bit wrapper for cpumasks.
291 static inline int cpumask_test_and_set_cpu(int cpu
, struct cpumask
*cpumask
)
293 return test_and_set_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
297 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
298 * @cpu: cpu number (< nr_cpu_ids)
299 * @cpumask: the cpumask pointer
301 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
303 * test_and_clear_bit wrapper for cpumasks.
305 static inline int cpumask_test_and_clear_cpu(int cpu
, struct cpumask
*cpumask
)
307 return test_and_clear_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
311 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
312 * @dstp: the cpumask pointer
314 static inline void cpumask_setall(struct cpumask
*dstp
)
316 bitmap_fill(cpumask_bits(dstp
), nr_cpumask_bits
);
320 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
321 * @dstp: the cpumask pointer
323 static inline void cpumask_clear(struct cpumask
*dstp
)
325 bitmap_zero(cpumask_bits(dstp
), nr_cpumask_bits
);
329 * cpumask_and - *dstp = *src1p & *src2p
330 * @dstp: the cpumask result
331 * @src1p: the first input
332 * @src2p: the second input
334 * If *@dstp is empty, returns 0, else returns 1
336 static inline int cpumask_and(struct cpumask
*dstp
,
337 const struct cpumask
*src1p
,
338 const struct cpumask
*src2p
)
340 return bitmap_and(cpumask_bits(dstp
), cpumask_bits(src1p
),
341 cpumask_bits(src2p
), nr_cpumask_bits
);
345 * cpumask_or - *dstp = *src1p | *src2p
346 * @dstp: the cpumask result
347 * @src1p: the first input
348 * @src2p: the second input
350 static inline void cpumask_or(struct cpumask
*dstp
, const struct cpumask
*src1p
,
351 const struct cpumask
*src2p
)
353 bitmap_or(cpumask_bits(dstp
), cpumask_bits(src1p
),
354 cpumask_bits(src2p
), nr_cpumask_bits
);
358 * cpumask_xor - *dstp = *src1p ^ *src2p
359 * @dstp: the cpumask result
360 * @src1p: the first input
361 * @src2p: the second input
363 static inline void cpumask_xor(struct cpumask
*dstp
,
364 const struct cpumask
*src1p
,
365 const struct cpumask
*src2p
)
367 bitmap_xor(cpumask_bits(dstp
), cpumask_bits(src1p
),
368 cpumask_bits(src2p
), nr_cpumask_bits
);
372 * cpumask_andnot - *dstp = *src1p & ~*src2p
373 * @dstp: the cpumask result
374 * @src1p: the first input
375 * @src2p: the second input
377 * If *@dstp is empty, returns 0, else returns 1
379 static inline int cpumask_andnot(struct cpumask
*dstp
,
380 const struct cpumask
*src1p
,
381 const struct cpumask
*src2p
)
383 return bitmap_andnot(cpumask_bits(dstp
), cpumask_bits(src1p
),
384 cpumask_bits(src2p
), nr_cpumask_bits
);
388 * cpumask_complement - *dstp = ~*srcp
389 * @dstp: the cpumask result
390 * @srcp: the input to invert
392 static inline void cpumask_complement(struct cpumask
*dstp
,
393 const struct cpumask
*srcp
)
395 bitmap_complement(cpumask_bits(dstp
), cpumask_bits(srcp
),
400 * cpumask_equal - *src1p == *src2p
401 * @src1p: the first input
402 * @src2p: the second input
404 static inline bool cpumask_equal(const struct cpumask
*src1p
,
405 const struct cpumask
*src2p
)
407 return bitmap_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
412 * cpumask_intersects - (*src1p & *src2p) != 0
413 * @src1p: the first input
414 * @src2p: the second input
416 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
417 const struct cpumask
*src2p
)
419 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
424 * cpumask_subset - (*src1p & ~*src2p) == 0
425 * @src1p: the first input
426 * @src2p: the second input
428 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
430 static inline int cpumask_subset(const struct cpumask
*src1p
,
431 const struct cpumask
*src2p
)
433 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
438 * cpumask_empty - *srcp == 0
439 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
441 static inline bool cpumask_empty(const struct cpumask
*srcp
)
443 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
447 * cpumask_full - *srcp == 0xFFFFFFFF...
448 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
450 static inline bool cpumask_full(const struct cpumask
*srcp
)
452 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
456 * cpumask_weight - Count of bits in *srcp
457 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
459 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
461 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
465 * cpumask_shift_right - *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_right(struct cpumask
*dstp
,
471 const struct cpumask
*srcp
, int n
)
473 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
478 * cpumask_shift_left - *dstp = *srcp << n
479 * @dstp: the cpumask result
480 * @srcp: the input to shift
481 * @n: the number of bits to shift by
483 static inline void cpumask_shift_left(struct cpumask
*dstp
,
484 const struct cpumask
*srcp
, int n
)
486 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
491 * cpumask_copy - *dstp = *srcp
493 * @srcp: the input cpumask
495 static inline void cpumask_copy(struct cpumask
*dstp
,
496 const struct cpumask
*srcp
)
498 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
502 * cpumask_any - pick a "random" cpu from *srcp
503 * @srcp: the input cpumask
505 * Returns >= nr_cpu_ids if no cpus set.
507 #define cpumask_any(srcp) cpumask_first(srcp)
510 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
511 * @src1p: the first input
512 * @src2p: the second input
514 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
516 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
519 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
520 * @mask1: the first input cpumask
521 * @mask2: the second input cpumask
523 * Returns >= nr_cpu_ids if no cpus set.
525 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
528 * cpumask_of - the cpumask containing just a given cpu
529 * @cpu: the cpu (<= nr_cpu_ids)
531 #define cpumask_of(cpu) (get_cpu_mask(cpu))
534 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
535 * @buf: the buffer to sprintf into
536 * @len: the length of the buffer
537 * @srcp: the cpumask to print
539 * If len is zero, returns zero. Otherwise returns the length of the
540 * (nul-terminated) @buf string.
542 static inline int cpumask_scnprintf(char *buf
, int len
,
543 const struct cpumask
*srcp
)
545 return bitmap_scnprintf(buf
, len
, cpumask_bits(srcp
), nr_cpumask_bits
);
549 * cpumask_parse_user - extract a cpumask from a user string
550 * @buf: the buffer to extract from
551 * @len: the length of the buffer
552 * @dstp: the cpumask to set.
554 * Returns -errno, or 0 for success.
556 static inline int cpumask_parse_user(const char __user
*buf
, int len
,
557 struct cpumask
*dstp
)
559 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
563 * cpumask_parselist_user - extract a cpumask from a user string
564 * @buf: the buffer to extract from
565 * @len: the length of the buffer
566 * @dstp: the cpumask to set.
568 * Returns -errno, or 0 for success.
570 static inline int cpumask_parselist_user(const char __user
*buf
, int len
,
571 struct cpumask
*dstp
)
573 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
578 * cpulist_scnprintf - print a cpumask into a string as comma-separated list
579 * @buf: the buffer to sprintf into
580 * @len: the length of the buffer
581 * @srcp: the cpumask to print
583 * If len is zero, returns zero. Otherwise returns the length of the
584 * (nul-terminated) @buf string.
586 static inline int cpulist_scnprintf(char *buf
, int len
,
587 const struct cpumask
*srcp
)
589 return bitmap_scnlistprintf(buf
, len
, cpumask_bits(srcp
),
594 * cpumask_parse - extract a cpumask from from a string
595 * @buf: the buffer to extract from
596 * @dstp: the cpumask to set.
598 * Returns -errno, or 0 for success.
600 static inline int cpumask_parse(const char *buf
, struct cpumask
*dstp
)
602 char *nl
= strchr(buf
, '\n');
603 int len
= nl
? nl
- buf
: strlen(buf
);
605 return bitmap_parse(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
609 * cpulist_parse - extract a cpumask from a user string of ranges
610 * @buf: the buffer to extract from
611 * @dstp: the cpumask to set.
613 * Returns -errno, or 0 for success.
615 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
617 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpumask_bits
);
621 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
623 * This will eventually be a runtime variable, depending on nr_cpu_ids.
625 static inline size_t cpumask_size(void)
627 /* FIXME: Once all cpumask assignments are eliminated, this
628 * can be nr_cpumask_bits */
629 return BITS_TO_LONGS(NR_CPUS
) * 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 #ifdef CONFIG_CPUMASK_OFFSTACK
663 typedef struct cpumask
*cpumask_var_t
;
665 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
666 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
667 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
668 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
669 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
670 void free_cpumask_var(cpumask_var_t mask
);
671 void free_bootmem_cpumask_var(cpumask_var_t mask
);
674 typedef struct cpumask cpumask_var_t
[1];
676 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
681 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
687 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
689 cpumask_clear(*mask
);
693 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
696 cpumask_clear(*mask
);
700 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
704 static inline void free_cpumask_var(cpumask_var_t mask
)
708 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
711 #endif /* CONFIG_CPUMASK_OFFSTACK */
713 /* It's common to want to use cpu_all_mask in struct member initializers,
714 * so it has to refer to an address rather than a pointer. */
715 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
716 #define cpu_all_mask to_cpumask(cpu_all_bits)
718 /* First bits of cpu_bit_bitmap are in fact unset. */
719 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
721 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
722 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
723 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
725 /* Wrappers for arch boot code to manipulate normally-constant masks */
726 void set_cpu_possible(unsigned int cpu
, bool possible
);
727 void set_cpu_present(unsigned int cpu
, bool present
);
728 void set_cpu_online(unsigned int cpu
, bool online
);
729 void set_cpu_active(unsigned int cpu
, bool active
);
730 void init_cpu_present(const struct cpumask
*src
);
731 void init_cpu_possible(const struct cpumask
*src
);
732 void init_cpu_online(const struct cpumask
*src
);
735 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
736 * @bitmap: the bitmap
738 * There are a few places where cpumask_var_t isn't appropriate and
739 * static cpumasks must be used (eg. very early boot), yet we don't
740 * expose the definition of 'struct cpumask'.
742 * This does the conversion, and can be used as a constant initializer.
744 #define to_cpumask(bitmap) \
745 ((struct cpumask *)(1 ? (bitmap) \
746 : (void *)sizeof(__check_is_bitmap(bitmap))))
748 static inline int __check_is_bitmap(const unsigned long *bitmap
)
754 * Special-case data structure for "single bit set only" constant CPU masks.
756 * We pre-generate all the 64 (or 32) possible bit positions, with enough
757 * padding to the left and the right, and return the constant pointer
758 * appropriately offset.
760 extern const unsigned long
761 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
763 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
765 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
766 p
-= cpu
/ BITS_PER_LONG
;
767 return to_cpumask(p
);
770 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
772 #if NR_CPUS <= BITS_PER_LONG
773 #define CPU_BITS_ALL \
775 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
778 #else /* NR_CPUS > BITS_PER_LONG */
780 #define CPU_BITS_ALL \
782 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
783 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
785 #endif /* NR_CPUS > BITS_PER_LONG */
789 * From here down, all obsolete. Use cpumask_ variants!
792 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
793 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
795 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
797 #if NR_CPUS <= BITS_PER_LONG
799 #define CPU_MASK_ALL \
801 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
806 #define CPU_MASK_ALL \
808 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
809 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
814 #define CPU_MASK_NONE \
816 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
819 #define CPU_MASK_CPU0 \
825 #define first_cpu(src) ({ (void)(src); 0; })
826 #define next_cpu(n, src) ({ (void)(src); 1; })
827 #define any_online_cpu(mask) 0
828 #define for_each_cpu_mask(cpu, mask) \
829 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
830 #else /* NR_CPUS > 1 */
831 int __first_cpu(const cpumask_t
*srcp
);
832 int __next_cpu(int n
, const cpumask_t
*srcp
);
834 #define first_cpu(src) __first_cpu(&(src))
835 #define next_cpu(n, src) __next_cpu((n), &(src))
836 #define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask)
837 #define for_each_cpu_mask(cpu, mask) \
839 (cpu) = next_cpu((cpu), (mask)), \
845 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
847 #else /* NR_CPUS > 64 */
849 int __next_cpu_nr(int n
, const cpumask_t
*srcp
);
850 #define for_each_cpu_mask_nr(cpu, mask) \
852 (cpu) = __next_cpu_nr((cpu), &(mask)), \
853 (cpu) < nr_cpu_ids; )
855 #endif /* NR_CPUS > 64 */
857 #define cpus_addr(src) ((src).bits)
859 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
860 static inline void __cpu_set(int cpu
, volatile cpumask_t
*dstp
)
862 set_bit(cpu
, dstp
->bits
);
865 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
866 static inline void __cpu_clear(int cpu
, volatile cpumask_t
*dstp
)
868 clear_bit(cpu
, dstp
->bits
);
871 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
872 static inline void __cpus_setall(cpumask_t
*dstp
, int nbits
)
874 bitmap_fill(dstp
->bits
, nbits
);
877 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
878 static inline void __cpus_clear(cpumask_t
*dstp
, int nbits
)
880 bitmap_zero(dstp
->bits
, nbits
);
883 /* No static inline type checking - see Subtlety (1) above. */
884 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
886 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
887 static inline int __cpu_test_and_set(int cpu
, cpumask_t
*addr
)
889 return test_and_set_bit(cpu
, addr
->bits
);
892 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
893 static inline int __cpus_and(cpumask_t
*dstp
, const cpumask_t
*src1p
,
894 const cpumask_t
*src2p
, int nbits
)
896 return bitmap_and(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
899 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
900 static inline void __cpus_or(cpumask_t
*dstp
, const cpumask_t
*src1p
,
901 const cpumask_t
*src2p
, int nbits
)
903 bitmap_or(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
906 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
907 static inline void __cpus_xor(cpumask_t
*dstp
, const cpumask_t
*src1p
,
908 const cpumask_t
*src2p
, int nbits
)
910 bitmap_xor(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
913 #define cpus_andnot(dst, src1, src2) \
914 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
915 static inline int __cpus_andnot(cpumask_t
*dstp
, const cpumask_t
*src1p
,
916 const cpumask_t
*src2p
, int nbits
)
918 return bitmap_andnot(dstp
->bits
, src1p
->bits
, src2p
->bits
, nbits
);
921 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
922 static inline int __cpus_equal(const cpumask_t
*src1p
,
923 const cpumask_t
*src2p
, int nbits
)
925 return bitmap_equal(src1p
->bits
, src2p
->bits
, nbits
);
928 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
929 static inline int __cpus_intersects(const cpumask_t
*src1p
,
930 const cpumask_t
*src2p
, int nbits
)
932 return bitmap_intersects(src1p
->bits
, src2p
->bits
, nbits
);
935 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
936 static inline int __cpus_subset(const cpumask_t
*src1p
,
937 const cpumask_t
*src2p
, int nbits
)
939 return bitmap_subset(src1p
->bits
, src2p
->bits
, nbits
);
942 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
943 static inline int __cpus_empty(const cpumask_t
*srcp
, int nbits
)
945 return bitmap_empty(srcp
->bits
, nbits
);
948 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
949 static inline int __cpus_weight(const cpumask_t
*srcp
, int nbits
)
951 return bitmap_weight(srcp
->bits
, nbits
);
954 #define cpus_shift_left(dst, src, n) \
955 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
956 static inline void __cpus_shift_left(cpumask_t
*dstp
,
957 const cpumask_t
*srcp
, int n
, int nbits
)
959 bitmap_shift_left(dstp
->bits
, srcp
->bits
, n
, nbits
);
961 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
963 #endif /* __LINUX_CPUMASK_H */
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