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 /* Don't assign or return these: may not be this big! */
15 typedef struct cpumask
{ DECLARE_BITMAP(bits
, NR_CPUS
); } cpumask_t
;
18 * cpumask_bits - get the bits in a cpumask
19 * @maskp: the struct cpumask *
21 * You should only assume nr_cpu_ids bits of this mask are valid. This is
22 * a macro so it's const-correct.
24 #define cpumask_bits(maskp) ((maskp)->bits)
27 * cpumask_pr_args - printf args to output a cpumask
28 * @maskp: cpumask to be printed
30 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask.
32 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp)
37 extern int nr_cpu_ids
;
40 #ifdef CONFIG_CPUMASK_OFFSTACK
41 /* Assuming NR_CPUS is huge, a runtime limit is more efficient. Also,
42 * not all bits may be allocated. */
43 #define nr_cpumask_bits ((unsigned int)nr_cpu_ids)
45 #define nr_cpumask_bits ((unsigned int)NR_CPUS)
49 * The following particular system cpumasks and operations manage
50 * possible, present, active and online cpus.
52 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable
53 * cpu_present_mask - has bit 'cpu' set iff cpu is populated
54 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler
55 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration
57 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
59 * The cpu_possible_mask is fixed at boot time, as the set of CPU id's
60 * that it is possible might ever be plugged in at anytime during the
61 * life of that system boot. The cpu_present_mask is dynamic(*),
62 * representing which CPUs are currently plugged in. And
63 * cpu_online_mask is the dynamic subset of cpu_present_mask,
64 * indicating those CPUs available for scheduling.
66 * If HOTPLUG is enabled, then cpu_possible_mask is forced to have
67 * all NR_CPUS bits set, otherwise it is just the set of CPUs that
68 * ACPI reports present at boot.
70 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically,
71 * depending on what ACPI reports as currently plugged in, otherwise
72 * cpu_present_mask is just a copy of cpu_possible_mask.
74 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not
75 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot.
78 * 1) UP arch's (NR_CPUS == 1, CONFIG_SMP not defined) hardcode
79 * assumption that their single CPU is online. The UP
80 * cpu_{online,possible,present}_masks are placebos. Changing them
81 * will have no useful affect on the following num_*_cpus()
82 * and cpu_*() macros in the UP case. This ugliness is a UP
83 * optimization - don't waste any instructions or memory references
84 * asking if you're online or how many CPUs there are if there is
88 extern struct cpumask __cpu_possible_mask
;
89 extern struct cpumask __cpu_online_mask
;
90 extern struct cpumask __cpu_present_mask
;
91 extern struct cpumask __cpu_active_mask
;
92 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask)
93 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask)
94 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask)
95 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask)
98 #define num_online_cpus() cpumask_weight(cpu_online_mask)
99 #define num_possible_cpus() cpumask_weight(cpu_possible_mask)
100 #define num_present_cpus() cpumask_weight(cpu_present_mask)
101 #define num_active_cpus() cpumask_weight(cpu_active_mask)
102 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask)
103 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask)
104 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask)
105 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask)
107 #define num_online_cpus() 1U
108 #define num_possible_cpus() 1U
109 #define num_present_cpus() 1U
110 #define num_active_cpus() 1U
111 #define cpu_online(cpu) ((cpu) == 0)
112 #define cpu_possible(cpu) ((cpu) == 0)
113 #define cpu_present(cpu) ((cpu) == 0)
114 #define cpu_active(cpu) ((cpu) == 0)
117 /* verify cpu argument to cpumask_* operators */
118 static inline unsigned int cpumask_check(unsigned int cpu
)
120 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
121 WARN_ON_ONCE(cpu
>= nr_cpumask_bits
);
122 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
127 /* Uniprocessor. Assume all masks are "1". */
128 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
133 /* Valid inputs for n are -1 and 0. */
134 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
139 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
144 static inline unsigned int cpumask_next_and(int n
,
145 const struct cpumask
*srcp
,
146 const struct cpumask
*andp
)
151 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
152 static inline unsigned int cpumask_any_but(const struct cpumask
*mask
,
158 static inline unsigned int cpumask_local_spread(unsigned int i
, int node
)
163 #define for_each_cpu(cpu, mask) \
164 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
165 #define for_each_cpu_not(cpu, mask) \
166 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
167 #define for_each_cpu_and(cpu, mask, and) \
168 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and)
171 * cpumask_first - get the first cpu in a cpumask
172 * @srcp: the cpumask pointer
174 * Returns >= nr_cpu_ids if no cpus set.
176 static inline unsigned int cpumask_first(const struct cpumask
*srcp
)
178 return find_first_bit(cpumask_bits(srcp
), nr_cpumask_bits
);
182 * cpumask_next - get the next cpu in a cpumask
183 * @n: the cpu prior to the place to search (ie. return will be > @n)
184 * @srcp: the cpumask pointer
186 * Returns >= nr_cpu_ids if no further cpus set.
188 static inline unsigned int cpumask_next(int n
, const struct cpumask
*srcp
)
190 /* -1 is a legal arg here. */
193 return find_next_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
197 * cpumask_next_zero - get the next unset cpu in a cpumask
198 * @n: the cpu prior to the place to search (ie. return will be > @n)
199 * @srcp: the cpumask pointer
201 * Returns >= nr_cpu_ids if no further cpus unset.
203 static inline unsigned int cpumask_next_zero(int n
, const struct cpumask
*srcp
)
205 /* -1 is a legal arg here. */
208 return find_next_zero_bit(cpumask_bits(srcp
), nr_cpumask_bits
, n
+1);
211 int cpumask_next_and(int n
, const struct cpumask
*, const struct cpumask
*);
212 int cpumask_any_but(const struct cpumask
*mask
, unsigned int cpu
);
213 unsigned int cpumask_local_spread(unsigned int i
, int node
);
216 * for_each_cpu - iterate over every cpu in a mask
217 * @cpu: the (optionally unsigned) integer iterator
218 * @mask: the cpumask pointer
220 * After the loop, cpu is >= nr_cpu_ids.
222 #define for_each_cpu(cpu, mask) \
224 (cpu) = cpumask_next((cpu), (mask)), \
228 * for_each_cpu_not - iterate over every cpu in a complemented mask
229 * @cpu: the (optionally unsigned) integer iterator
230 * @mask: the cpumask pointer
232 * After the loop, cpu is >= nr_cpu_ids.
234 #define for_each_cpu_not(cpu, mask) \
236 (cpu) = cpumask_next_zero((cpu), (mask)), \
239 extern int cpumask_next_wrap(int n
, const struct cpumask
*mask
, int start
, bool wrap
);
242 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location
243 * @cpu: the (optionally unsigned) integer iterator
244 * @mask: the cpumask poiter
245 * @start: the start location
247 * The implementation does not assume any bit in @mask is set (including @start).
249 * After the loop, cpu is >= nr_cpu_ids.
251 #define for_each_cpu_wrap(cpu, mask, start) \
252 for ((cpu) = cpumask_next_wrap((start)-1, (mask), (start), false); \
253 (cpu) < nr_cpumask_bits; \
254 (cpu) = cpumask_next_wrap((cpu), (mask), (start), true))
257 * for_each_cpu_and - iterate over every cpu in both masks
258 * @cpu: the (optionally unsigned) integer iterator
259 * @mask: the first cpumask pointer
260 * @and: the second cpumask pointer
262 * This saves a temporary CPU mask in many places. It is equivalent to:
263 * struct cpumask tmp;
264 * cpumask_and(&tmp, &mask, &and);
265 * for_each_cpu(cpu, &tmp)
268 * After the loop, cpu is >= nr_cpu_ids.
270 #define for_each_cpu_and(cpu, mask, and) \
272 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
276 #define CPU_BITS_NONE \
278 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
281 #define CPU_BITS_CPU0 \
287 * cpumask_set_cpu - set a cpu in a cpumask
288 * @cpu: cpu number (< nr_cpu_ids)
289 * @dstp: the cpumask pointer
291 static inline void cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
293 set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
296 static inline void __cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
298 __set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
303 * cpumask_clear_cpu - clear a cpu in a cpumask
304 * @cpu: cpu number (< nr_cpu_ids)
305 * @dstp: the cpumask pointer
307 static inline void cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
309 clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
312 static inline void __cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
314 __clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
318 * cpumask_test_cpu - test for a cpu in a cpumask
319 * @cpu: cpu number (< nr_cpu_ids)
320 * @cpumask: the cpumask pointer
322 * Returns 1 if @cpu is set in @cpumask, else returns 0
324 static inline int cpumask_test_cpu(int cpu
, const struct cpumask
*cpumask
)
326 return test_bit(cpumask_check(cpu
), cpumask_bits((cpumask
)));
330 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
331 * @cpu: cpu number (< nr_cpu_ids)
332 * @cpumask: the cpumask pointer
334 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
336 * test_and_set_bit wrapper for cpumasks.
338 static inline int cpumask_test_and_set_cpu(int cpu
, struct cpumask
*cpumask
)
340 return test_and_set_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
344 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
345 * @cpu: cpu number (< nr_cpu_ids)
346 * @cpumask: the cpumask pointer
348 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
350 * test_and_clear_bit wrapper for cpumasks.
352 static inline int cpumask_test_and_clear_cpu(int cpu
, struct cpumask
*cpumask
)
354 return test_and_clear_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
358 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
359 * @dstp: the cpumask pointer
361 static inline void cpumask_setall(struct cpumask
*dstp
)
363 bitmap_fill(cpumask_bits(dstp
), nr_cpumask_bits
);
367 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
368 * @dstp: the cpumask pointer
370 static inline void cpumask_clear(struct cpumask
*dstp
)
372 bitmap_zero(cpumask_bits(dstp
), nr_cpumask_bits
);
376 * cpumask_and - *dstp = *src1p & *src2p
377 * @dstp: the cpumask result
378 * @src1p: the first input
379 * @src2p: the second input
381 * If *@dstp is empty, returns 0, else returns 1
383 static inline int cpumask_and(struct cpumask
*dstp
,
384 const struct cpumask
*src1p
,
385 const struct cpumask
*src2p
)
387 return bitmap_and(cpumask_bits(dstp
), cpumask_bits(src1p
),
388 cpumask_bits(src2p
), nr_cpumask_bits
);
392 * cpumask_or - *dstp = *src1p | *src2p
393 * @dstp: the cpumask result
394 * @src1p: the first input
395 * @src2p: the second input
397 static inline void cpumask_or(struct cpumask
*dstp
, const struct cpumask
*src1p
,
398 const struct cpumask
*src2p
)
400 bitmap_or(cpumask_bits(dstp
), cpumask_bits(src1p
),
401 cpumask_bits(src2p
), nr_cpumask_bits
);
405 * cpumask_xor - *dstp = *src1p ^ *src2p
406 * @dstp: the cpumask result
407 * @src1p: the first input
408 * @src2p: the second input
410 static inline void cpumask_xor(struct cpumask
*dstp
,
411 const struct cpumask
*src1p
,
412 const struct cpumask
*src2p
)
414 bitmap_xor(cpumask_bits(dstp
), cpumask_bits(src1p
),
415 cpumask_bits(src2p
), nr_cpumask_bits
);
419 * cpumask_andnot - *dstp = *src1p & ~*src2p
420 * @dstp: the cpumask result
421 * @src1p: the first input
422 * @src2p: the second input
424 * If *@dstp is empty, returns 0, else returns 1
426 static inline int cpumask_andnot(struct cpumask
*dstp
,
427 const struct cpumask
*src1p
,
428 const struct cpumask
*src2p
)
430 return bitmap_andnot(cpumask_bits(dstp
), cpumask_bits(src1p
),
431 cpumask_bits(src2p
), nr_cpumask_bits
);
435 * cpumask_complement - *dstp = ~*srcp
436 * @dstp: the cpumask result
437 * @srcp: the input to invert
439 static inline void cpumask_complement(struct cpumask
*dstp
,
440 const struct cpumask
*srcp
)
442 bitmap_complement(cpumask_bits(dstp
), cpumask_bits(srcp
),
447 * cpumask_equal - *src1p == *src2p
448 * @src1p: the first input
449 * @src2p: the second input
451 static inline bool cpumask_equal(const struct cpumask
*src1p
,
452 const struct cpumask
*src2p
)
454 return bitmap_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
459 * cpumask_intersects - (*src1p & *src2p) != 0
460 * @src1p: the first input
461 * @src2p: the second input
463 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
464 const struct cpumask
*src2p
)
466 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
471 * cpumask_subset - (*src1p & ~*src2p) == 0
472 * @src1p: the first input
473 * @src2p: the second input
475 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
477 static inline int cpumask_subset(const struct cpumask
*src1p
,
478 const struct cpumask
*src2p
)
480 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
485 * cpumask_empty - *srcp == 0
486 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
488 static inline bool cpumask_empty(const struct cpumask
*srcp
)
490 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
494 * cpumask_full - *srcp == 0xFFFFFFFF...
495 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
497 static inline bool cpumask_full(const struct cpumask
*srcp
)
499 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
503 * cpumask_weight - Count of bits in *srcp
504 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
506 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
508 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
512 * cpumask_shift_right - *dstp = *srcp >> n
513 * @dstp: the cpumask result
514 * @srcp: the input to shift
515 * @n: the number of bits to shift by
517 static inline void cpumask_shift_right(struct cpumask
*dstp
,
518 const struct cpumask
*srcp
, int n
)
520 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
525 * cpumask_shift_left - *dstp = *srcp << n
526 * @dstp: the cpumask result
527 * @srcp: the input to shift
528 * @n: the number of bits to shift by
530 static inline void cpumask_shift_left(struct cpumask
*dstp
,
531 const struct cpumask
*srcp
, int n
)
533 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
538 * cpumask_copy - *dstp = *srcp
540 * @srcp: the input cpumask
542 static inline void cpumask_copy(struct cpumask
*dstp
,
543 const struct cpumask
*srcp
)
545 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
549 * cpumask_any - pick a "random" cpu from *srcp
550 * @srcp: the input cpumask
552 * Returns >= nr_cpu_ids if no cpus set.
554 #define cpumask_any(srcp) cpumask_first(srcp)
557 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
558 * @src1p: the first input
559 * @src2p: the second input
561 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
563 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
566 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
567 * @mask1: the first input cpumask
568 * @mask2: the second input cpumask
570 * Returns >= nr_cpu_ids if no cpus set.
572 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
575 * cpumask_of - the cpumask containing just a given cpu
576 * @cpu: the cpu (<= nr_cpu_ids)
578 #define cpumask_of(cpu) (get_cpu_mask(cpu))
581 * cpumask_parse_user - extract a cpumask from a user string
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 cpumask_parse_user(const char __user
*buf
, int len
,
589 struct cpumask
*dstp
)
591 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
595 * cpumask_parselist_user - extract a cpumask from a user string
596 * @buf: the buffer to extract from
597 * @len: the length of the buffer
598 * @dstp: the cpumask to set.
600 * Returns -errno, or 0 for success.
602 static inline int cpumask_parselist_user(const char __user
*buf
, int len
,
603 struct cpumask
*dstp
)
605 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
610 * cpumask_parse - extract a cpumask from a string
611 * @buf: the buffer to extract from
612 * @dstp: the cpumask to set.
614 * Returns -errno, or 0 for success.
616 static inline int cpumask_parse(const char *buf
, struct cpumask
*dstp
)
618 char *nl
= strchr(buf
, '\n');
619 unsigned int len
= nl
? (unsigned int)(nl
- buf
) : strlen(buf
);
621 return bitmap_parse(buf
, len
, cpumask_bits(dstp
), nr_cpumask_bits
);
625 * cpulist_parse - extract a cpumask from a user string of ranges
626 * @buf: the buffer to extract from
627 * @dstp: the cpumask to set.
629 * Returns -errno, or 0 for success.
631 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
633 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpumask_bits
);
637 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
639 static inline size_t cpumask_size(void)
641 return BITS_TO_LONGS(nr_cpumask_bits
) * sizeof(long);
645 * cpumask_var_t: struct cpumask for stack usage.
647 * Oh, the wicked games we play! In order to make kernel coding a
648 * little more difficult, we typedef cpumask_var_t to an array or a
649 * pointer: doing &mask on an array is a noop, so it still works.
652 * cpumask_var_t tmpmask;
653 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
656 * ... use 'tmpmask' like a normal struct cpumask * ...
658 * free_cpumask_var(tmpmask);
661 * However, one notable exception is there. alloc_cpumask_var() allocates
662 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
663 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
665 * cpumask_var_t tmpmask;
666 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
671 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
672 * cpumask_copy() provide safe copy functionality.
674 * Note that there is another evil here: If you define a cpumask_var_t
675 * as a percpu variable then the way to obtain the address of the cpumask
676 * structure differently influences what this_cpu_* operation needs to be
677 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
678 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
679 * other type of cpumask_var_t implementation is configured.
681 * Please also note that __cpumask_var_read_mostly can be used to declare
682 * a cpumask_var_t variable itself (not its content) as read mostly.
684 #ifdef CONFIG_CPUMASK_OFFSTACK
685 typedef struct cpumask
*cpumask_var_t
;
687 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
688 #define __cpumask_var_read_mostly __read_mostly
690 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
691 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
692 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
693 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
694 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
695 void free_cpumask_var(cpumask_var_t mask
);
696 void free_bootmem_cpumask_var(cpumask_var_t mask
);
698 static inline bool cpumask_available(cpumask_var_t mask
)
704 typedef struct cpumask cpumask_var_t
[1];
706 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
707 #define __cpumask_var_read_mostly
709 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
714 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
720 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
722 cpumask_clear(*mask
);
726 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
729 cpumask_clear(*mask
);
733 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
737 static inline void free_cpumask_var(cpumask_var_t mask
)
741 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
745 static inline bool cpumask_available(cpumask_var_t mask
)
749 #endif /* CONFIG_CPUMASK_OFFSTACK */
751 /* It's common to want to use cpu_all_mask in struct member initializers,
752 * so it has to refer to an address rather than a pointer. */
753 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
754 #define cpu_all_mask to_cpumask(cpu_all_bits)
756 /* First bits of cpu_bit_bitmap are in fact unset. */
757 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
759 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
760 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
761 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
763 /* Wrappers for arch boot code to manipulate normally-constant masks */
764 void init_cpu_present(const struct cpumask
*src
);
765 void init_cpu_possible(const struct cpumask
*src
);
766 void init_cpu_online(const struct cpumask
*src
);
768 static inline void reset_cpu_possible_mask(void)
770 bitmap_zero(cpumask_bits(&__cpu_possible_mask
), NR_CPUS
);
774 set_cpu_possible(unsigned int cpu
, bool possible
)
777 cpumask_set_cpu(cpu
, &__cpu_possible_mask
);
779 cpumask_clear_cpu(cpu
, &__cpu_possible_mask
);
783 set_cpu_present(unsigned int cpu
, bool present
)
786 cpumask_set_cpu(cpu
, &__cpu_present_mask
);
788 cpumask_clear_cpu(cpu
, &__cpu_present_mask
);
792 set_cpu_online(unsigned int cpu
, bool online
)
795 cpumask_set_cpu(cpu
, &__cpu_online_mask
);
797 cpumask_clear_cpu(cpu
, &__cpu_online_mask
);
801 set_cpu_active(unsigned int cpu
, bool active
)
804 cpumask_set_cpu(cpu
, &__cpu_active_mask
);
806 cpumask_clear_cpu(cpu
, &__cpu_active_mask
);
811 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
812 * @bitmap: the bitmap
814 * There are a few places where cpumask_var_t isn't appropriate and
815 * static cpumasks must be used (eg. very early boot), yet we don't
816 * expose the definition of 'struct cpumask'.
818 * This does the conversion, and can be used as a constant initializer.
820 #define to_cpumask(bitmap) \
821 ((struct cpumask *)(1 ? (bitmap) \
822 : (void *)sizeof(__check_is_bitmap(bitmap))))
824 static inline int __check_is_bitmap(const unsigned long *bitmap
)
830 * Special-case data structure for "single bit set only" constant CPU masks.
832 * We pre-generate all the 64 (or 32) possible bit positions, with enough
833 * padding to the left and the right, and return the constant pointer
834 * appropriately offset.
836 extern const unsigned long
837 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
839 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
841 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
842 p
-= cpu
/ BITS_PER_LONG
;
843 return to_cpumask(p
);
846 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
848 #if NR_CPUS <= BITS_PER_LONG
849 #define CPU_BITS_ALL \
851 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
854 #else /* NR_CPUS > BITS_PER_LONG */
856 #define CPU_BITS_ALL \
858 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
859 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
861 #endif /* NR_CPUS > BITS_PER_LONG */
864 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
865 * as comma-separated list of cpus or hex values of cpumask
866 * @list: indicates whether the cpumap must be list
867 * @mask: the cpumask to copy
868 * @buf: the buffer to copy into
870 * Returns the length of the (null-terminated) @buf string, zero if
873 static inline ssize_t
874 cpumap_print_to_pagebuf(bool list
, char *buf
, const struct cpumask
*mask
)
876 return bitmap_print_to_pagebuf(list
, buf
, cpumask_bits(mask
),
880 #if NR_CPUS <= BITS_PER_LONG
881 #define CPU_MASK_ALL \
883 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
886 #define CPU_MASK_ALL \
888 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
889 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
891 #endif /* NR_CPUS > BITS_PER_LONG */
893 #define CPU_MASK_NONE \
895 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
898 #define CPU_MASK_CPU0 \
903 #endif /* __LINUX_CPUMASK_H */