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 nr_cpu_ids
45 #define nr_cpumask_bits 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)), \
240 * for_each_cpu_and - iterate over every cpu in both masks
241 * @cpu: the (optionally unsigned) integer iterator
242 * @mask: the first cpumask pointer
243 * @and: the second cpumask pointer
245 * This saves a temporary CPU mask in many places. It is equivalent to:
246 * struct cpumask tmp;
247 * cpumask_and(&tmp, &mask, &and);
248 * for_each_cpu(cpu, &tmp)
251 * After the loop, cpu is >= nr_cpu_ids.
253 #define for_each_cpu_and(cpu, mask, and) \
255 (cpu) = cpumask_next_and((cpu), (mask), (and)), \
259 #define CPU_BITS_NONE \
261 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
264 #define CPU_BITS_CPU0 \
270 * cpumask_set_cpu - set a cpu in a cpumask
271 * @cpu: cpu number (< nr_cpu_ids)
272 * @dstp: the cpumask pointer
274 static inline void cpumask_set_cpu(unsigned int cpu
, struct cpumask
*dstp
)
276 set_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
280 * cpumask_clear_cpu - clear a cpu in a cpumask
281 * @cpu: cpu number (< nr_cpu_ids)
282 * @dstp: the cpumask pointer
284 static inline void cpumask_clear_cpu(int cpu
, struct cpumask
*dstp
)
286 clear_bit(cpumask_check(cpu
), cpumask_bits(dstp
));
290 * cpumask_test_cpu - test for a cpu in a cpumask
291 * @cpu: cpu number (< nr_cpu_ids)
292 * @cpumask: the cpumask pointer
294 * Returns 1 if @cpu is set in @cpumask, else returns 0
296 static inline int cpumask_test_cpu(int cpu
, const struct cpumask
*cpumask
)
298 return test_bit(cpumask_check(cpu
), cpumask_bits((cpumask
)));
302 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
303 * @cpu: cpu number (< nr_cpu_ids)
304 * @cpumask: the cpumask pointer
306 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
308 * test_and_set_bit wrapper for cpumasks.
310 static inline int cpumask_test_and_set_cpu(int cpu
, struct cpumask
*cpumask
)
312 return test_and_set_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
316 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
317 * @cpu: cpu number (< nr_cpu_ids)
318 * @cpumask: the cpumask pointer
320 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0
322 * test_and_clear_bit wrapper for cpumasks.
324 static inline int cpumask_test_and_clear_cpu(int cpu
, struct cpumask
*cpumask
)
326 return test_and_clear_bit(cpumask_check(cpu
), cpumask_bits(cpumask
));
330 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
331 * @dstp: the cpumask pointer
333 static inline void cpumask_setall(struct cpumask
*dstp
)
335 bitmap_fill(cpumask_bits(dstp
), nr_cpumask_bits
);
339 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
340 * @dstp: the cpumask pointer
342 static inline void cpumask_clear(struct cpumask
*dstp
)
344 bitmap_zero(cpumask_bits(dstp
), nr_cpumask_bits
);
348 * cpumask_and - *dstp = *src1p & *src2p
349 * @dstp: the cpumask result
350 * @src1p: the first input
351 * @src2p: the second input
353 * If *@dstp is empty, returns 0, else returns 1
355 static inline int cpumask_and(struct cpumask
*dstp
,
356 const struct cpumask
*src1p
,
357 const struct cpumask
*src2p
)
359 return bitmap_and(cpumask_bits(dstp
), cpumask_bits(src1p
),
360 cpumask_bits(src2p
), nr_cpumask_bits
);
364 * cpumask_or - *dstp = *src1p | *src2p
365 * @dstp: the cpumask result
366 * @src1p: the first input
367 * @src2p: the second input
369 static inline void cpumask_or(struct cpumask
*dstp
, const struct cpumask
*src1p
,
370 const struct cpumask
*src2p
)
372 bitmap_or(cpumask_bits(dstp
), cpumask_bits(src1p
),
373 cpumask_bits(src2p
), nr_cpumask_bits
);
377 * cpumask_xor - *dstp = *src1p ^ *src2p
378 * @dstp: the cpumask result
379 * @src1p: the first input
380 * @src2p: the second input
382 static inline void cpumask_xor(struct cpumask
*dstp
,
383 const struct cpumask
*src1p
,
384 const struct cpumask
*src2p
)
386 bitmap_xor(cpumask_bits(dstp
), cpumask_bits(src1p
),
387 cpumask_bits(src2p
), nr_cpumask_bits
);
391 * cpumask_andnot - *dstp = *src1p & ~*src2p
392 * @dstp: the cpumask result
393 * @src1p: the first input
394 * @src2p: the second input
396 * If *@dstp is empty, returns 0, else returns 1
398 static inline int cpumask_andnot(struct cpumask
*dstp
,
399 const struct cpumask
*src1p
,
400 const struct cpumask
*src2p
)
402 return bitmap_andnot(cpumask_bits(dstp
), cpumask_bits(src1p
),
403 cpumask_bits(src2p
), nr_cpumask_bits
);
407 * cpumask_complement - *dstp = ~*srcp
408 * @dstp: the cpumask result
409 * @srcp: the input to invert
411 static inline void cpumask_complement(struct cpumask
*dstp
,
412 const struct cpumask
*srcp
)
414 bitmap_complement(cpumask_bits(dstp
), cpumask_bits(srcp
),
419 * cpumask_equal - *src1p == *src2p
420 * @src1p: the first input
421 * @src2p: the second input
423 static inline bool cpumask_equal(const struct cpumask
*src1p
,
424 const struct cpumask
*src2p
)
426 return bitmap_equal(cpumask_bits(src1p
), cpumask_bits(src2p
),
431 * cpumask_intersects - (*src1p & *src2p) != 0
432 * @src1p: the first input
433 * @src2p: the second input
435 static inline bool cpumask_intersects(const struct cpumask
*src1p
,
436 const struct cpumask
*src2p
)
438 return bitmap_intersects(cpumask_bits(src1p
), cpumask_bits(src2p
),
443 * cpumask_subset - (*src1p & ~*src2p) == 0
444 * @src1p: the first input
445 * @src2p: the second input
447 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0
449 static inline int cpumask_subset(const struct cpumask
*src1p
,
450 const struct cpumask
*src2p
)
452 return bitmap_subset(cpumask_bits(src1p
), cpumask_bits(src2p
),
457 * cpumask_empty - *srcp == 0
458 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
460 static inline bool cpumask_empty(const struct cpumask
*srcp
)
462 return bitmap_empty(cpumask_bits(srcp
), nr_cpumask_bits
);
466 * cpumask_full - *srcp == 0xFFFFFFFF...
467 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
469 static inline bool cpumask_full(const struct cpumask
*srcp
)
471 return bitmap_full(cpumask_bits(srcp
), nr_cpumask_bits
);
475 * cpumask_weight - Count of bits in *srcp
476 * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
478 static inline unsigned int cpumask_weight(const struct cpumask
*srcp
)
480 return bitmap_weight(cpumask_bits(srcp
), nr_cpumask_bits
);
484 * cpumask_shift_right - *dstp = *srcp >> n
485 * @dstp: the cpumask result
486 * @srcp: the input to shift
487 * @n: the number of bits to shift by
489 static inline void cpumask_shift_right(struct cpumask
*dstp
,
490 const struct cpumask
*srcp
, int n
)
492 bitmap_shift_right(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
497 * cpumask_shift_left - *dstp = *srcp << n
498 * @dstp: the cpumask result
499 * @srcp: the input to shift
500 * @n: the number of bits to shift by
502 static inline void cpumask_shift_left(struct cpumask
*dstp
,
503 const struct cpumask
*srcp
, int n
)
505 bitmap_shift_left(cpumask_bits(dstp
), cpumask_bits(srcp
), n
,
510 * cpumask_copy - *dstp = *srcp
512 * @srcp: the input cpumask
514 static inline void cpumask_copy(struct cpumask
*dstp
,
515 const struct cpumask
*srcp
)
517 bitmap_copy(cpumask_bits(dstp
), cpumask_bits(srcp
), nr_cpumask_bits
);
521 * cpumask_any - pick a "random" cpu from *srcp
522 * @srcp: the input cpumask
524 * Returns >= nr_cpu_ids if no cpus set.
526 #define cpumask_any(srcp) cpumask_first(srcp)
529 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
530 * @src1p: the first input
531 * @src2p: the second input
533 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and().
535 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
538 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
539 * @mask1: the first input cpumask
540 * @mask2: the second input cpumask
542 * Returns >= nr_cpu_ids if no cpus set.
544 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
547 * cpumask_of - the cpumask containing just a given cpu
548 * @cpu: the cpu (<= nr_cpu_ids)
550 #define cpumask_of(cpu) (get_cpu_mask(cpu))
553 * cpumask_parse_user - extract a cpumask from a user string
554 * @buf: the buffer to extract from
555 * @len: the length of the buffer
556 * @dstp: the cpumask to set.
558 * Returns -errno, or 0 for success.
560 static inline int cpumask_parse_user(const char __user
*buf
, int len
,
561 struct cpumask
*dstp
)
563 return bitmap_parse_user(buf
, len
, cpumask_bits(dstp
), nr_cpu_ids
);
567 * cpumask_parselist_user - extract a cpumask from a user string
568 * @buf: the buffer to extract from
569 * @len: the length of the buffer
570 * @dstp: the cpumask to set.
572 * Returns -errno, or 0 for success.
574 static inline int cpumask_parselist_user(const char __user
*buf
, int len
,
575 struct cpumask
*dstp
)
577 return bitmap_parselist_user(buf
, len
, cpumask_bits(dstp
),
582 * cpumask_parse - extract a cpumask from from a string
583 * @buf: the buffer to extract from
584 * @dstp: the cpumask to set.
586 * Returns -errno, or 0 for success.
588 static inline int cpumask_parse(const char *buf
, struct cpumask
*dstp
)
590 char *nl
= strchr(buf
, '\n');
591 unsigned int len
= nl
? (unsigned int)(nl
- buf
) : strlen(buf
);
593 return bitmap_parse(buf
, len
, cpumask_bits(dstp
), nr_cpu_ids
);
597 * cpulist_parse - extract a cpumask from a user string of ranges
598 * @buf: the buffer to extract from
599 * @dstp: the cpumask to set.
601 * Returns -errno, or 0 for success.
603 static inline int cpulist_parse(const char *buf
, struct cpumask
*dstp
)
605 return bitmap_parselist(buf
, cpumask_bits(dstp
), nr_cpu_ids
);
609 * cpumask_size - size to allocate for a 'struct cpumask' in bytes
611 static inline size_t cpumask_size(void)
613 return BITS_TO_LONGS(nr_cpumask_bits
) * sizeof(long);
617 * cpumask_var_t: struct cpumask for stack usage.
619 * Oh, the wicked games we play! In order to make kernel coding a
620 * little more difficult, we typedef cpumask_var_t to an array or a
621 * pointer: doing &mask on an array is a noop, so it still works.
624 * cpumask_var_t tmpmask;
625 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
628 * ... use 'tmpmask' like a normal struct cpumask * ...
630 * free_cpumask_var(tmpmask);
633 * However, one notable exception is there. alloc_cpumask_var() allocates
634 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
635 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
637 * cpumask_var_t tmpmask;
638 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
643 * This code makes NR_CPUS length memcopy and brings to a memory corruption.
644 * cpumask_copy() provide safe copy functionality.
646 * Note that there is another evil here: If you define a cpumask_var_t
647 * as a percpu variable then the way to obtain the address of the cpumask
648 * structure differently influences what this_cpu_* operation needs to be
649 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use
650 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the
651 * other type of cpumask_var_t implementation is configured.
653 #ifdef CONFIG_CPUMASK_OFFSTACK
654 typedef struct cpumask
*cpumask_var_t
;
656 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x)
658 bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
659 bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
660 bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
, int node
);
661 bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
);
662 void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
);
663 void free_cpumask_var(cpumask_var_t mask
);
664 void free_bootmem_cpumask_var(cpumask_var_t mask
);
667 typedef struct cpumask cpumask_var_t
[1];
669 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x)
671 static inline bool alloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
676 static inline bool alloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
682 static inline bool zalloc_cpumask_var(cpumask_var_t
*mask
, gfp_t flags
)
684 cpumask_clear(*mask
);
688 static inline bool zalloc_cpumask_var_node(cpumask_var_t
*mask
, gfp_t flags
,
691 cpumask_clear(*mask
);
695 static inline void alloc_bootmem_cpumask_var(cpumask_var_t
*mask
)
699 static inline void free_cpumask_var(cpumask_var_t mask
)
703 static inline void free_bootmem_cpumask_var(cpumask_var_t mask
)
706 #endif /* CONFIG_CPUMASK_OFFSTACK */
708 /* It's common to want to use cpu_all_mask in struct member initializers,
709 * so it has to refer to an address rather than a pointer. */
710 extern const DECLARE_BITMAP(cpu_all_bits
, NR_CPUS
);
711 #define cpu_all_mask to_cpumask(cpu_all_bits)
713 /* First bits of cpu_bit_bitmap are in fact unset. */
714 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
716 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
717 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask)
718 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask)
720 /* Wrappers for arch boot code to manipulate normally-constant masks */
721 void init_cpu_present(const struct cpumask
*src
);
722 void init_cpu_possible(const struct cpumask
*src
);
723 void init_cpu_online(const struct cpumask
*src
);
726 set_cpu_possible(unsigned int cpu
, bool possible
)
729 cpumask_set_cpu(cpu
, &__cpu_possible_mask
);
731 cpumask_clear_cpu(cpu
, &__cpu_possible_mask
);
735 set_cpu_present(unsigned int cpu
, bool present
)
738 cpumask_set_cpu(cpu
, &__cpu_present_mask
);
740 cpumask_clear_cpu(cpu
, &__cpu_present_mask
);
744 set_cpu_online(unsigned int cpu
, bool online
)
747 cpumask_set_cpu(cpu
, &__cpu_online_mask
);
748 cpumask_set_cpu(cpu
, &__cpu_active_mask
);
750 cpumask_clear_cpu(cpu
, &__cpu_online_mask
);
755 set_cpu_active(unsigned int cpu
, bool active
)
758 cpumask_set_cpu(cpu
, &__cpu_active_mask
);
760 cpumask_clear_cpu(cpu
, &__cpu_active_mask
);
765 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
766 * @bitmap: the bitmap
768 * There are a few places where cpumask_var_t isn't appropriate and
769 * static cpumasks must be used (eg. very early boot), yet we don't
770 * expose the definition of 'struct cpumask'.
772 * This does the conversion, and can be used as a constant initializer.
774 #define to_cpumask(bitmap) \
775 ((struct cpumask *)(1 ? (bitmap) \
776 : (void *)sizeof(__check_is_bitmap(bitmap))))
778 static inline int __check_is_bitmap(const unsigned long *bitmap
)
784 * Special-case data structure for "single bit set only" constant CPU masks.
786 * We pre-generate all the 64 (or 32) possible bit positions, with enough
787 * padding to the left and the right, and return the constant pointer
788 * appropriately offset.
790 extern const unsigned long
791 cpu_bit_bitmap
[BITS_PER_LONG
+1][BITS_TO_LONGS(NR_CPUS
)];
793 static inline const struct cpumask
*get_cpu_mask(unsigned int cpu
)
795 const unsigned long *p
= cpu_bit_bitmap
[1 + cpu
% BITS_PER_LONG
];
796 p
-= cpu
/ BITS_PER_LONG
;
797 return to_cpumask(p
);
800 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu))
802 #if NR_CPUS <= BITS_PER_LONG
803 #define CPU_BITS_ALL \
805 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
808 #else /* NR_CPUS > BITS_PER_LONG */
810 #define CPU_BITS_ALL \
812 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
813 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
815 #endif /* NR_CPUS > BITS_PER_LONG */
818 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either
819 * as comma-separated list of cpus or hex values of cpumask
820 * @list: indicates whether the cpumap must be list
821 * @mask: the cpumask to copy
822 * @buf: the buffer to copy into
824 * Returns the length of the (null-terminated) @buf string, zero if
827 static inline ssize_t
828 cpumap_print_to_pagebuf(bool list
, char *buf
, const struct cpumask
*mask
)
830 return bitmap_print_to_pagebuf(list
, buf
, cpumask_bits(mask
),
834 #if NR_CPUS <= BITS_PER_LONG
835 #define CPU_MASK_ALL \
837 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
840 #define CPU_MASK_ALL \
842 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \
843 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \
845 #endif /* NR_CPUS > BITS_PER_LONG */
847 #define CPU_MASK_NONE \
849 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \
852 #define CPU_MASK_CPU0 \
857 #endif /* __LINUX_CPUMASK_H */