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[linux-2.6/next.git] / include / linux / cpumask.h
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1 #ifndef __LINUX_CPUMASK_H
2 #define __LINUX_CPUMASK_H
4 /*
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.
8 */
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;
15 /**
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)
24 #if NR_CPUS == 1
25 #define nr_cpu_ids 1
26 #else
27 extern int nr_cpu_ids;
28 #endif
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
34 #else
35 #define nr_cpumask_bits NR_CPUS
36 #endif
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.
67 * Subtleties:
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
75 * only one CPU.
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;
83 #if NR_CPUS > 1
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)
92 #else
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)
101 #endif
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 */
109 return cpu;
112 #if NR_CPUS == 1
113 /* Uniprocessor. Assume all masks are "1". */
114 static inline unsigned int cpumask_first(const struct cpumask *srcp)
116 return 0;
119 /* Valid inputs for n are -1 and 0. */
120 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
122 return n+1;
125 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
127 return n+1;
130 static inline unsigned int cpumask_next_and(int n,
131 const struct cpumask *srcp,
132 const struct cpumask *andp)
134 return n+1;
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,
139 unsigned int cpu)
141 return 1;
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)
150 #else
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. */
172 if (n != -1)
173 cpumask_check(n);
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. */
187 if (n != -1)
188 cpumask_check(n);
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) \
203 for ((cpu) = -1; \
204 (cpu) = cpumask_next((cpu), (mask)), \
205 (cpu) < nr_cpu_ids;)
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) \
215 for ((cpu) = -1; \
216 (cpu) = cpumask_next_zero((cpu), (mask)), \
217 (cpu) < nr_cpu_ids;)
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)
229 * ...
231 * After the loop, cpu is >= nr_cpu_ids.
233 #define for_each_cpu_and(cpu, mask, and) \
234 for ((cpu) = -1; \
235 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
236 (cpu) < nr_cpu_ids;)
237 #endif /* SMP */
239 #define CPU_BITS_NONE \
241 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
244 #define CPU_BITS_CPU0 \
246 [0] = 1UL \
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),
385 nr_cpumask_bits);
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),
397 nr_cpumask_bits);
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),
409 nr_cpumask_bits);
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),
421 nr_cpumask_bits);
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,
461 nr_cpumask_bits);
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,
474 nr_cpumask_bits);
478 * cpumask_copy - *dstp = *srcp
479 * @dstp: the result
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),
561 nr_cpumask_bits);
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),
577 nr_cpumask_bits);
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.
612 * ie.
613 * cpumask_var_t tmpmask;
614 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
615 * return -ENOMEM;
617 * ... use 'tmpmask' like a normal struct cpumask * ...
619 * free_cpumask_var(tmpmask);
621 #ifdef CONFIG_CPUMASK_OFFSTACK
622 typedef struct cpumask *cpumask_var_t;
624 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
625 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
626 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
627 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
628 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
629 void free_cpumask_var(cpumask_var_t mask);
630 void free_bootmem_cpumask_var(cpumask_var_t mask);
632 #else
633 typedef struct cpumask cpumask_var_t[1];
635 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
637 return true;
640 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
641 int node)
643 return true;
646 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
648 cpumask_clear(*mask);
649 return true;
652 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
653 int node)
655 cpumask_clear(*mask);
656 return true;
659 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
663 static inline void free_cpumask_var(cpumask_var_t mask)
667 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
670 #endif /* CONFIG_CPUMASK_OFFSTACK */
672 /* It's common to want to use cpu_all_mask in struct member initializers,
673 * so it has to refer to an address rather than a pointer. */
674 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
675 #define cpu_all_mask to_cpumask(cpu_all_bits)
677 /* First bits of cpu_bit_bitmap are in fact unset. */
678 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
680 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
681 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
682 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
684 /* Wrappers for arch boot code to manipulate normally-constant masks */
685 void set_cpu_possible(unsigned int cpu, bool possible);
686 void set_cpu_present(unsigned int cpu, bool present);
687 void set_cpu_online(unsigned int cpu, bool online);
688 void set_cpu_active(unsigned int cpu, bool active);
689 void init_cpu_present(const struct cpumask *src);
690 void init_cpu_possible(const struct cpumask *src);
691 void init_cpu_online(const struct cpumask *src);
694 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
695 * @bitmap: the bitmap
697 * There are a few places where cpumask_var_t isn't appropriate and
698 * static cpumasks must be used (eg. very early boot), yet we don't
699 * expose the definition of 'struct cpumask'.
701 * This does the conversion, and can be used as a constant initializer.
703 #define to_cpumask(bitmap) \
704 ((struct cpumask *)(1 ? (bitmap) \
705 : (void *)sizeof(__check_is_bitmap(bitmap))))
707 static inline int __check_is_bitmap(const unsigned long *bitmap)
709 return 1;
713 * Special-case data structure for "single bit set only" constant CPU masks.
715 * We pre-generate all the 64 (or 32) possible bit positions, with enough
716 * padding to the left and the right, and return the constant pointer
717 * appropriately offset.
719 extern const unsigned long
720 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
722 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
724 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
725 p -= cpu / BITS_PER_LONG;
726 return to_cpumask(p);
729 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
731 #if NR_CPUS <= BITS_PER_LONG
732 #define CPU_BITS_ALL \
734 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
737 #else /* NR_CPUS > BITS_PER_LONG */
739 #define CPU_BITS_ALL \
741 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
742 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
744 #endif /* NR_CPUS > BITS_PER_LONG */
748 * From here down, all obsolete. Use cpumask_ variants!
751 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
752 /* These strip const, as traditionally they weren't const. */
753 #define cpu_possible_map (*(cpumask_t *)cpu_possible_mask)
754 #define cpu_online_map (*(cpumask_t *)cpu_online_mask)
755 #define cpu_present_map (*(cpumask_t *)cpu_present_mask)
756 #define cpu_active_map (*(cpumask_t *)cpu_active_mask)
758 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
760 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
762 #if NR_CPUS <= BITS_PER_LONG
764 #define CPU_MASK_ALL \
765 (cpumask_t) { { \
766 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
769 #else
771 #define CPU_MASK_ALL \
772 (cpumask_t) { { \
773 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
774 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \
777 #endif
779 #define CPU_MASK_NONE \
780 (cpumask_t) { { \
781 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
784 #define CPU_MASK_CPU0 \
785 (cpumask_t) { { \
786 [0] = 1UL \
789 #if NR_CPUS == 1
790 #define first_cpu(src) ({ (void)(src); 0; })
791 #define next_cpu(n, src) ({ (void)(src); 1; })
792 #define any_online_cpu(mask) 0
793 #define for_each_cpu_mask(cpu, mask) \
794 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
795 #else /* NR_CPUS > 1 */
796 int __first_cpu(const cpumask_t *srcp);
797 int __next_cpu(int n, const cpumask_t *srcp);
798 int __any_online_cpu(const cpumask_t *mask);
800 #define first_cpu(src) __first_cpu(&(src))
801 #define next_cpu(n, src) __next_cpu((n), &(src))
802 #define any_online_cpu(mask) __any_online_cpu(&(mask))
803 #define for_each_cpu_mask(cpu, mask) \
804 for ((cpu) = -1; \
805 (cpu) = next_cpu((cpu), (mask)), \
806 (cpu) < NR_CPUS; )
807 #endif /* SMP */
809 #if NR_CPUS <= 64
811 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask)
813 #else /* NR_CPUS > 64 */
815 int __next_cpu_nr(int n, const cpumask_t *srcp);
816 #define for_each_cpu_mask_nr(cpu, mask) \
817 for ((cpu) = -1; \
818 (cpu) = __next_cpu_nr((cpu), &(mask)), \
819 (cpu) < nr_cpu_ids; )
821 #endif /* NR_CPUS > 64 */
823 #define cpus_addr(src) ((src).bits)
825 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
826 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
828 set_bit(cpu, dstp->bits);
831 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
832 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
834 clear_bit(cpu, dstp->bits);
837 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
838 static inline void __cpus_setall(cpumask_t *dstp, int nbits)
840 bitmap_fill(dstp->bits, nbits);
843 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
844 static inline void __cpus_clear(cpumask_t *dstp, int nbits)
846 bitmap_zero(dstp->bits, nbits);
849 /* No static inline type checking - see Subtlety (1) above. */
850 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
852 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
853 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
855 return test_and_set_bit(cpu, addr->bits);
858 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
859 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
860 const cpumask_t *src2p, int nbits)
862 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
865 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
866 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
867 const cpumask_t *src2p, int nbits)
869 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
872 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
873 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
874 const cpumask_t *src2p, int nbits)
876 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
879 #define cpus_andnot(dst, src1, src2) \
880 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
881 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
882 const cpumask_t *src2p, int nbits)
884 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
887 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
888 static inline int __cpus_equal(const cpumask_t *src1p,
889 const cpumask_t *src2p, int nbits)
891 return bitmap_equal(src1p->bits, src2p->bits, nbits);
894 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
895 static inline int __cpus_intersects(const cpumask_t *src1p,
896 const cpumask_t *src2p, int nbits)
898 return bitmap_intersects(src1p->bits, src2p->bits, nbits);
901 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
902 static inline int __cpus_subset(const cpumask_t *src1p,
903 const cpumask_t *src2p, int nbits)
905 return bitmap_subset(src1p->bits, src2p->bits, nbits);
908 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
909 static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
911 return bitmap_empty(srcp->bits, nbits);
914 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
915 static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
917 return bitmap_weight(srcp->bits, nbits);
920 #define cpus_shift_left(dst, src, n) \
921 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
922 static inline void __cpus_shift_left(cpumask_t *dstp,
923 const cpumask_t *srcp, int n, int nbits)
925 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
927 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
929 #endif /* __LINUX_CPUMASK_H */