1 #ifndef __LINUX_CPUMASK_H
2 #define __LINUX_CPUMASK_H
3 
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>
12 #include <linux/bug.h>
13 
14 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t;
15 
16 /**
17  * cpumask_bits - get the bits in a cpumask
18  * @maskp: the struct cpumask *
19  *
20  * You should only assume nr_cpu_ids bits of this mask are valid.  This is
21  * a macro so it's const-correct.
22  */
23 #define cpumask_bits(maskp) ((maskp)->bits)
24 
25 #if NR_CPUS == 1
26 #define nr_cpu_ids		1
27 #else
28 extern int nr_cpu_ids;
29 #endif
30 
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
35 #else
36 #define nr_cpumask_bits	NR_CPUS
37 #endif
38 
39 /*
40  * The following particular system cpumasks and operations manage
41  * possible, present, active and online cpus.
42  *
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
47  *
48  *  If !CONFIG_HOTPLUG_CPU, present == possible, and active == online.
49  *
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.
56  *
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.
60  *
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.
64  *
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.
67  *
68  * Subtleties:
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
76  *    only one CPU.
77  */
78 
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;
83 
84 #if NR_CPUS > 1
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)
93 #else
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)
102 #endif
103 
104 /* verify cpu argument to cpumask_* operators */
cpumask_check(unsigned int cpu)105 static inline unsigned int cpumask_check(unsigned int cpu)
106 {
107 #ifdef CONFIG_DEBUG_PER_CPU_MAPS
108 	WARN_ON_ONCE(cpu >= nr_cpumask_bits);
109 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */
110 	return cpu;
111 }
112 
113 #if NR_CPUS == 1
114 /* Uniprocessor.  Assume all masks are "1". */
cpumask_first(const struct cpumask * srcp)115 static inline unsigned int cpumask_first(const struct cpumask *srcp)
116 {
117 	return 0;
118 }
119 
120 /* Valid inputs for n are -1 and 0. */
cpumask_next(int n,const struct cpumask * srcp)121 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
122 {
123 	return n+1;
124 }
125 
cpumask_next_zero(int n,const struct cpumask * srcp)126 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
127 {
128 	return n+1;
129 }
130 
cpumask_next_and(int n,const struct cpumask * srcp,const struct cpumask * andp)131 static inline unsigned int cpumask_next_and(int n,
132 					    const struct cpumask *srcp,
133 					    const struct cpumask *andp)
134 {
135 	return n+1;
136 }
137 
138 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
cpumask_any_but(const struct cpumask * mask,unsigned int cpu)139 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
140 					   unsigned int cpu)
141 {
142 	return 1;
143 }
144 
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)
151 #else
152 /**
153  * cpumask_first - get the first cpu in a cpumask
154  * @srcp: the cpumask pointer
155  *
156  * Returns >= nr_cpu_ids if no cpus set.
157  */
cpumask_first(const struct cpumask * srcp)158 static inline unsigned int cpumask_first(const struct cpumask *srcp)
159 {
160 	return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits);
161 }
162 
163 /**
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
167  *
168  * Returns >= nr_cpu_ids if no further cpus set.
169  */
cpumask_next(int n,const struct cpumask * srcp)170 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp)
171 {
172 	/* -1 is a legal arg here. */
173 	if (n != -1)
174 		cpumask_check(n);
175 	return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
176 }
177 
178 /**
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
182  *
183  * Returns >= nr_cpu_ids if no further cpus unset.
184  */
cpumask_next_zero(int n,const struct cpumask * srcp)185 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp)
186 {
187 	/* -1 is a legal arg here. */
188 	if (n != -1)
189 		cpumask_check(n);
190 	return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1);
191 }
192 
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);
195 
196 /**
197  * for_each_cpu - iterate over every cpu in a mask
198  * @cpu: the (optionally unsigned) integer iterator
199  * @mask: the cpumask pointer
200  *
201  * After the loop, cpu is >= nr_cpu_ids.
202  */
203 #define for_each_cpu(cpu, mask)				\
204 	for ((cpu) = -1;				\
205 		(cpu) = cpumask_next((cpu), (mask)),	\
206 		(cpu) < nr_cpu_ids;)
207 
208 /**
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
212  *
213  * After the loop, cpu is >= nr_cpu_ids.
214  */
215 #define for_each_cpu_not(cpu, mask)				\
216 	for ((cpu) = -1;					\
217 		(cpu) = cpumask_next_zero((cpu), (mask)),	\
218 		(cpu) < nr_cpu_ids;)
219 
220 /**
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
225  *
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)
230  *		...
231  *
232  * After the loop, cpu is >= nr_cpu_ids.
233  */
234 #define for_each_cpu_and(cpu, mask, and)				\
235 	for ((cpu) = -1;						\
236 		(cpu) = cpumask_next_and((cpu), (mask), (and)),		\
237 		(cpu) < nr_cpu_ids;)
238 #endif /* SMP */
239 
240 #define CPU_BITS_NONE						\
241 {								\
242 	[0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL			\
243 }
244 
245 #define CPU_BITS_CPU0						\
246 {								\
247 	[0] =  1UL						\
248 }
249 
250 /**
251  * cpumask_set_cpu - set a cpu in a cpumask
252  * @cpu: cpu number (< nr_cpu_ids)
253  * @dstp: the cpumask pointer
254  */
cpumask_set_cpu(unsigned int cpu,struct cpumask * dstp)255 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp)
256 {
257 	set_bit(cpumask_check(cpu), cpumask_bits(dstp));
258 }
259 
260 /**
261  * cpumask_clear_cpu - clear a cpu in a cpumask
262  * @cpu: cpu number (< nr_cpu_ids)
263  * @dstp: the cpumask pointer
264  */
cpumask_clear_cpu(int cpu,struct cpumask * dstp)265 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp)
266 {
267 	clear_bit(cpumask_check(cpu), cpumask_bits(dstp));
268 }
269 
270 /**
271  * cpumask_test_cpu - test for a cpu in a cpumask
272  * @cpu: cpu number (< nr_cpu_ids)
273  * @cpumask: the cpumask pointer
274  *
275  * No static inline type checking - see Subtlety (1) above.
276  */
277 #define cpumask_test_cpu(cpu, cpumask) \
278 	test_bit(cpumask_check(cpu), cpumask_bits((cpumask)))
279 
280 /**
281  * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask
282  * @cpu: cpu number (< nr_cpu_ids)
283  * @cpumask: the cpumask pointer
284  *
285  * test_and_set_bit wrapper for cpumasks.
286  */
cpumask_test_and_set_cpu(int cpu,struct cpumask * cpumask)287 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask)
288 {
289 	return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask));
290 }
291 
292 /**
293  * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask
294  * @cpu: cpu number (< nr_cpu_ids)
295  * @cpumask: the cpumask pointer
296  *
297  * test_and_clear_bit wrapper for cpumasks.
298  */
cpumask_test_and_clear_cpu(int cpu,struct cpumask * cpumask)299 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask)
300 {
301 	return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask));
302 }
303 
304 /**
305  * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask
306  * @dstp: the cpumask pointer
307  */
cpumask_setall(struct cpumask * dstp)308 static inline void cpumask_setall(struct cpumask *dstp)
309 {
310 	bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits);
311 }
312 
313 /**
314  * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask
315  * @dstp: the cpumask pointer
316  */
cpumask_clear(struct cpumask * dstp)317 static inline void cpumask_clear(struct cpumask *dstp)
318 {
319 	bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits);
320 }
321 
322 /**
323  * cpumask_and - *dstp = *src1p & *src2p
324  * @dstp: the cpumask result
325  * @src1p: the first input
326  * @src2p: the second input
327  */
cpumask_and(struct cpumask * dstp,const struct cpumask * src1p,const struct cpumask * src2p)328 static inline int cpumask_and(struct cpumask *dstp,
329 			       const struct cpumask *src1p,
330 			       const struct cpumask *src2p)
331 {
332 	return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p),
333 				       cpumask_bits(src2p), nr_cpumask_bits);
334 }
335 
336 /**
337  * cpumask_or - *dstp = *src1p | *src2p
338  * @dstp: the cpumask result
339  * @src1p: the first input
340  * @src2p: the second input
341  */
cpumask_or(struct cpumask * dstp,const struct cpumask * src1p,const struct cpumask * src2p)342 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p,
343 			      const struct cpumask *src2p)
344 {
345 	bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p),
346 				      cpumask_bits(src2p), nr_cpumask_bits);
347 }
348 
349 /**
350  * cpumask_xor - *dstp = *src1p ^ *src2p
351  * @dstp: the cpumask result
352  * @src1p: the first input
353  * @src2p: the second input
354  */
cpumask_xor(struct cpumask * dstp,const struct cpumask * src1p,const struct cpumask * src2p)355 static inline void cpumask_xor(struct cpumask *dstp,
356 			       const struct cpumask *src1p,
357 			       const struct cpumask *src2p)
358 {
359 	bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p),
360 				       cpumask_bits(src2p), nr_cpumask_bits);
361 }
362 
363 /**
364  * cpumask_andnot - *dstp = *src1p & ~*src2p
365  * @dstp: the cpumask result
366  * @src1p: the first input
367  * @src2p: the second input
368  */
cpumask_andnot(struct cpumask * dstp,const struct cpumask * src1p,const struct cpumask * src2p)369 static inline int cpumask_andnot(struct cpumask *dstp,
370 				  const struct cpumask *src1p,
371 				  const struct cpumask *src2p)
372 {
373 	return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p),
374 					  cpumask_bits(src2p), nr_cpumask_bits);
375 }
376 
377 /**
378  * cpumask_complement - *dstp = ~*srcp
379  * @dstp: the cpumask result
380  * @srcp: the input to invert
381  */
cpumask_complement(struct cpumask * dstp,const struct cpumask * srcp)382 static inline void cpumask_complement(struct cpumask *dstp,
383 				      const struct cpumask *srcp)
384 {
385 	bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp),
386 					      nr_cpumask_bits);
387 }
388 
389 /**
390  * cpumask_equal - *src1p == *src2p
391  * @src1p: the first input
392  * @src2p: the second input
393  */
cpumask_equal(const struct cpumask * src1p,const struct cpumask * src2p)394 static inline bool cpumask_equal(const struct cpumask *src1p,
395 				const struct cpumask *src2p)
396 {
397 	return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p),
398 						 nr_cpumask_bits);
399 }
400 
401 /**
402  * cpumask_intersects - (*src1p & *src2p) != 0
403  * @src1p: the first input
404  * @src2p: the second input
405  */
cpumask_intersects(const struct cpumask * src1p,const struct cpumask * src2p)406 static inline bool cpumask_intersects(const struct cpumask *src1p,
407 				     const struct cpumask *src2p)
408 {
409 	return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p),
410 						      nr_cpumask_bits);
411 }
412 
413 /**
414  * cpumask_subset - (*src1p & ~*src2p) == 0
415  * @src1p: the first input
416  * @src2p: the second input
417  */
cpumask_subset(const struct cpumask * src1p,const struct cpumask * src2p)418 static inline int cpumask_subset(const struct cpumask *src1p,
419 				 const struct cpumask *src2p)
420 {
421 	return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p),
422 						  nr_cpumask_bits);
423 }
424 
425 /**
426  * cpumask_empty - *srcp == 0
427  * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear.
428  */
cpumask_empty(const struct cpumask * srcp)429 static inline bool cpumask_empty(const struct cpumask *srcp)
430 {
431 	return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits);
432 }
433 
434 /**
435  * cpumask_full - *srcp == 0xFFFFFFFF...
436  * @srcp: the cpumask to that all cpus < nr_cpu_ids are set.
437  */
cpumask_full(const struct cpumask * srcp)438 static inline bool cpumask_full(const struct cpumask *srcp)
439 {
440 	return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits);
441 }
442 
443 /**
444  * cpumask_weight - Count of bits in *srcp
445  * @srcp: the cpumask to count bits (< nr_cpu_ids) in.
446  */
cpumask_weight(const struct cpumask * srcp)447 static inline unsigned int cpumask_weight(const struct cpumask *srcp)
448 {
449 	return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits);
450 }
451 
452 /**
453  * cpumask_shift_right - *dstp = *srcp >> n
454  * @dstp: the cpumask result
455  * @srcp: the input to shift
456  * @n: the number of bits to shift by
457  */
cpumask_shift_right(struct cpumask * dstp,const struct cpumask * srcp,int n)458 static inline void cpumask_shift_right(struct cpumask *dstp,
459 				       const struct cpumask *srcp, int n)
460 {
461 	bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n,
462 					       nr_cpumask_bits);
463 }
464 
465 /**
466  * cpumask_shift_left - *dstp = *srcp << n
467  * @dstp: the cpumask result
468  * @srcp: the input to shift
469  * @n: the number of bits to shift by
470  */
cpumask_shift_left(struct cpumask * dstp,const struct cpumask * srcp,int n)471 static inline void cpumask_shift_left(struct cpumask *dstp,
472 				      const struct cpumask *srcp, int n)
473 {
474 	bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n,
475 					      nr_cpumask_bits);
476 }
477 
478 /**
479  * cpumask_copy - *dstp = *srcp
480  * @dstp: the result
481  * @srcp: the input cpumask
482  */
cpumask_copy(struct cpumask * dstp,const struct cpumask * srcp)483 static inline void cpumask_copy(struct cpumask *dstp,
484 				const struct cpumask *srcp)
485 {
486 	bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits);
487 }
488 
489 /**
490  * cpumask_any - pick a "random" cpu from *srcp
491  * @srcp: the input cpumask
492  *
493  * Returns >= nr_cpu_ids if no cpus set.
494  */
495 #define cpumask_any(srcp) cpumask_first(srcp)
496 
497 /**
498  * cpumask_first_and - return the first cpu from *srcp1 & *srcp2
499  * @src1p: the first input
500  * @src2p: the second input
501  *
502  * Returns >= nr_cpu_ids if no cpus set in both.  See also cpumask_next_and().
503  */
504 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p))
505 
506 /**
507  * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2
508  * @mask1: the first input cpumask
509  * @mask2: the second input cpumask
510  *
511  * Returns >= nr_cpu_ids if no cpus set.
512  */
513 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2))
514 
515 /**
516  * cpumask_of - the cpumask containing just a given cpu
517  * @cpu: the cpu (<= nr_cpu_ids)
518  */
519 #define cpumask_of(cpu) (get_cpu_mask(cpu))
520 
521 /**
522  * cpumask_scnprintf - print a cpumask into a string as comma-separated hex
523  * @buf: the buffer to sprintf into
524  * @len: the length of the buffer
525  * @srcp: the cpumask to print
526  *
527  * If len is zero, returns zero.  Otherwise returns the length of the
528  * (nul-terminated) @buf string.
529  */
cpumask_scnprintf(char * buf,int len,const struct cpumask * srcp)530 static inline int cpumask_scnprintf(char *buf, int len,
531 				    const struct cpumask *srcp)
532 {
533 	return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits);
534 }
535 
536 /**
537  * cpumask_parse_user - extract a cpumask from a user string
538  * @buf: the buffer to extract from
539  * @len: the length of the buffer
540  * @dstp: the cpumask to set.
541  *
542  * Returns -errno, or 0 for success.
543  */
cpumask_parse_user(const char __user * buf,int len,struct cpumask * dstp)544 static inline int cpumask_parse_user(const char __user *buf, int len,
545 				     struct cpumask *dstp)
546 {
547 	return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits);
548 }
549 
550 /**
551  * cpumask_parselist_user - extract a cpumask from a user string
552  * @buf: the buffer to extract from
553  * @len: the length of the buffer
554  * @dstp: the cpumask to set.
555  *
556  * Returns -errno, or 0 for success.
557  */
cpumask_parselist_user(const char __user * buf,int len,struct cpumask * dstp)558 static inline int cpumask_parselist_user(const char __user *buf, int len,
559 				     struct cpumask *dstp)
560 {
561 	return bitmap_parselist_user(buf, len, cpumask_bits(dstp),
562 							nr_cpumask_bits);
563 }
564 
565 /**
566  * cpulist_scnprintf - print a cpumask into a string as comma-separated list
567  * @buf: the buffer to sprintf into
568  * @len: the length of the buffer
569  * @srcp: the cpumask to print
570  *
571  * If len is zero, returns zero.  Otherwise returns the length of the
572  * (nul-terminated) @buf string.
573  */
cpulist_scnprintf(char * buf,int len,const struct cpumask * srcp)574 static inline int cpulist_scnprintf(char *buf, int len,
575 				    const struct cpumask *srcp)
576 {
577 	return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp),
578 				    nr_cpumask_bits);
579 }
580 
581 /**
582  * cpulist_parse_user - extract a cpumask from a user string of ranges
583  * @buf: the buffer to extract from
584  * @len: the length of the buffer
585  * @dstp: the cpumask to set.
586  *
587  * Returns -errno, or 0 for success.
588  */
cpulist_parse(const char * buf,struct cpumask * dstp)589 static inline int cpulist_parse(const char *buf, struct cpumask *dstp)
590 {
591 	return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits);
592 }
593 
594 /**
595  * cpumask_size - size to allocate for a 'struct cpumask' in bytes
596  *
597  * This will eventually be a runtime variable, depending on nr_cpu_ids.
598  */
cpumask_size(void)599 static inline size_t cpumask_size(void)
600 {
601 	/* FIXME: Once all cpumask assignments are eliminated, this
602 	 * can be nr_cpumask_bits */
603 	return BITS_TO_LONGS(NR_CPUS) * sizeof(long);
604 }
605 
606 /*
607  * cpumask_var_t: struct cpumask for stack usage.
608  *
609  * Oh, the wicked games we play!  In order to make kernel coding a
610  * little more difficult, we typedef cpumask_var_t to an array or a
611  * pointer: doing &mask on an array is a noop, so it still works.
612  *
613  * ie.
614  *	cpumask_var_t tmpmask;
615  *	if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
616  *		return -ENOMEM;
617  *
618  *	  ... use 'tmpmask' like a normal struct cpumask * ...
619  *
620  *	free_cpumask_var(tmpmask);
621  *
622  *
623  * However, one notable exception is there. alloc_cpumask_var() allocates
624  * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has
625  * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t.
626  *
627  *	cpumask_var_t tmpmask;
628  *	if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL))
629  *		return -ENOMEM;
630  *
631  *	var = *tmpmask;
632  *
633  * This code makes NR_CPUS length memcopy and brings to a memory corruption.
634  * cpumask_copy() provide safe copy functionality.
635  */
636 #ifdef CONFIG_CPUMASK_OFFSTACK
637 typedef struct cpumask *cpumask_var_t;
638 
639 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
640 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
641 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node);
642 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags);
643 void alloc_bootmem_cpumask_var(cpumask_var_t *mask);
644 void free_cpumask_var(cpumask_var_t mask);
645 void free_bootmem_cpumask_var(cpumask_var_t mask);
646 
647 #else
648 typedef struct cpumask cpumask_var_t[1];
649 
alloc_cpumask_var(cpumask_var_t * mask,gfp_t flags)650 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
651 {
652 	return true;
653 }
654 
alloc_cpumask_var_node(cpumask_var_t * mask,gfp_t flags,int node)655 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
656 					  int node)
657 {
658 	return true;
659 }
660 
zalloc_cpumask_var(cpumask_var_t * mask,gfp_t flags)661 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
662 {
663 	cpumask_clear(*mask);
664 	return true;
665 }
666 
zalloc_cpumask_var_node(cpumask_var_t * mask,gfp_t flags,int node)667 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags,
668 					  int node)
669 {
670 	cpumask_clear(*mask);
671 	return true;
672 }
673 
alloc_bootmem_cpumask_var(cpumask_var_t * mask)674 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask)
675 {
676 }
677 
free_cpumask_var(cpumask_var_t mask)678 static inline void free_cpumask_var(cpumask_var_t mask)
679 {
680 }
681 
free_bootmem_cpumask_var(cpumask_var_t mask)682 static inline void free_bootmem_cpumask_var(cpumask_var_t mask)
683 {
684 }
685 #endif /* CONFIG_CPUMASK_OFFSTACK */
686 
687 /* It's common to want to use cpu_all_mask in struct member initializers,
688  * so it has to refer to an address rather than a pointer. */
689 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS);
690 #define cpu_all_mask to_cpumask(cpu_all_bits)
691 
692 /* First bits of cpu_bit_bitmap are in fact unset. */
693 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0])
694 
695 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask)
696 #define for_each_online_cpu(cpu)   for_each_cpu((cpu), cpu_online_mask)
697 #define for_each_present_cpu(cpu)  for_each_cpu((cpu), cpu_present_mask)
698 
699 /* Wrappers for arch boot code to manipulate normally-constant masks */
700 void set_cpu_possible(unsigned int cpu, bool possible);
701 void set_cpu_present(unsigned int cpu, bool present);
702 void set_cpu_online(unsigned int cpu, bool online);
703 void set_cpu_active(unsigned int cpu, bool active);
704 void init_cpu_present(const struct cpumask *src);
705 void init_cpu_possible(const struct cpumask *src);
706 void init_cpu_online(const struct cpumask *src);
707 
708 /**
709  * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask *
710  * @bitmap: the bitmap
711  *
712  * There are a few places where cpumask_var_t isn't appropriate and
713  * static cpumasks must be used (eg. very early boot), yet we don't
714  * expose the definition of 'struct cpumask'.
715  *
716  * This does the conversion, and can be used as a constant initializer.
717  */
718 #define to_cpumask(bitmap)						\
719 	((struct cpumask *)(1 ? (bitmap)				\
720 			    : (void *)sizeof(__check_is_bitmap(bitmap))))
721 
__check_is_bitmap(const unsigned long * bitmap)722 static inline int __check_is_bitmap(const unsigned long *bitmap)
723 {
724 	return 1;
725 }
726 
727 /*
728  * Special-case data structure for "single bit set only" constant CPU masks.
729  *
730  * We pre-generate all the 64 (or 32) possible bit positions, with enough
731  * padding to the left and the right, and return the constant pointer
732  * appropriately offset.
733  */
734 extern const unsigned long
735 	cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)];
736 
get_cpu_mask(unsigned int cpu)737 static inline const struct cpumask *get_cpu_mask(unsigned int cpu)
738 {
739 	const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG];
740 	p -= cpu / BITS_PER_LONG;
741 	return to_cpumask(p);
742 }
743 
744 #define cpu_is_offline(cpu)	unlikely(!cpu_online(cpu))
745 
746 #if NR_CPUS <= BITS_PER_LONG
747 #define CPU_BITS_ALL						\
748 {								\
749 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD	\
750 }
751 
752 #else /* NR_CPUS > BITS_PER_LONG */
753 
754 #define CPU_BITS_ALL						\
755 {								\
756 	[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,		\
757 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD		\
758 }
759 #endif /* NR_CPUS > BITS_PER_LONG */
760 
761 /*
762  *
763  * From here down, all obsolete.  Use cpumask_ variants!
764  *
765  */
766 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
767 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu))
768 
769 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS)
770 
771 #if NR_CPUS <= BITS_PER_LONG
772 
773 #define CPU_MASK_ALL							\
774 (cpumask_t) { {								\
775 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
776 } }
777 
778 #else
779 
780 #define CPU_MASK_ALL							\
781 (cpumask_t) { {								\
782 	[0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL,			\
783 	[BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD			\
784 } }
785 
786 #endif
787 
788 #define CPU_MASK_NONE							\
789 (cpumask_t) { {								\
790 	[0 ... BITS_TO_LONGS(NR_CPUS)-1] =  0UL				\
791 } }
792 
793 #define CPU_MASK_CPU0							\
794 (cpumask_t) { {								\
795 	[0] =  1UL							\
796 } }
797 
798 #if NR_CPUS == 1
799 #define first_cpu(src)		({ (void)(src); 0; })
800 #define next_cpu(n, src)	({ (void)(src); 1; })
801 #define any_online_cpu(mask)	0
802 #define for_each_cpu_mask(cpu, mask)	\
803 	for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask)
804 #else /* NR_CPUS > 1 */
805 int __first_cpu(const cpumask_t *srcp);
806 int __next_cpu(int n, const cpumask_t *srcp);
807 
808 #define first_cpu(src)		__first_cpu(&(src))
809 #define next_cpu(n, src)	__next_cpu((n), &(src))
810 #define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask)
811 #define for_each_cpu_mask(cpu, mask)			\
812 	for ((cpu) = -1;				\
813 		(cpu) = next_cpu((cpu), (mask)),	\
814 		(cpu) < NR_CPUS; )
815 #endif /* SMP */
816 
817 #if NR_CPUS <= 64
818 
819 #define for_each_cpu_mask_nr(cpu, mask)	for_each_cpu_mask(cpu, mask)
820 
821 #else /* NR_CPUS > 64 */
822 
823 int __next_cpu_nr(int n, const cpumask_t *srcp);
824 #define for_each_cpu_mask_nr(cpu, mask)			\
825 	for ((cpu) = -1;				\
826 		(cpu) = __next_cpu_nr((cpu), &(mask)),	\
827 		(cpu) < nr_cpu_ids; )
828 
829 #endif /* NR_CPUS > 64 */
830 
831 #define cpus_addr(src) ((src).bits)
832 
833 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst))
__cpu_set(int cpu,volatile cpumask_t * dstp)834 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp)
835 {
836 	set_bit(cpu, dstp->bits);
837 }
838 
839 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst))
__cpu_clear(int cpu,volatile cpumask_t * dstp)840 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp)
841 {
842 	clear_bit(cpu, dstp->bits);
843 }
844 
845 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS)
__cpus_setall(cpumask_t * dstp,int nbits)846 static inline void __cpus_setall(cpumask_t *dstp, int nbits)
847 {
848 	bitmap_fill(dstp->bits, nbits);
849 }
850 
851 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS)
__cpus_clear(cpumask_t * dstp,int nbits)852 static inline void __cpus_clear(cpumask_t *dstp, int nbits)
853 {
854 	bitmap_zero(dstp->bits, nbits);
855 }
856 
857 /* No static inline type checking - see Subtlety (1) above. */
858 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits)
859 
860 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask))
__cpu_test_and_set(int cpu,cpumask_t * addr)861 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr)
862 {
863 	return test_and_set_bit(cpu, addr->bits);
864 }
865 
866 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS)
__cpus_and(cpumask_t * dstp,const cpumask_t * src1p,const cpumask_t * src2p,int nbits)867 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p,
868 					const cpumask_t *src2p, int nbits)
869 {
870 	return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits);
871 }
872 
873 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS)
__cpus_or(cpumask_t * dstp,const cpumask_t * src1p,const cpumask_t * src2p,int nbits)874 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p,
875 					const cpumask_t *src2p, int nbits)
876 {
877 	bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits);
878 }
879 
880 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS)
__cpus_xor(cpumask_t * dstp,const cpumask_t * src1p,const cpumask_t * src2p,int nbits)881 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p,
882 					const cpumask_t *src2p, int nbits)
883 {
884 	bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits);
885 }
886 
887 #define cpus_andnot(dst, src1, src2) \
888 				__cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS)
__cpus_andnot(cpumask_t * dstp,const cpumask_t * src1p,const cpumask_t * src2p,int nbits)889 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p,
890 					const cpumask_t *src2p, int nbits)
891 {
892 	return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits);
893 }
894 
895 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS)
__cpus_equal(const cpumask_t * src1p,const cpumask_t * src2p,int nbits)896 static inline int __cpus_equal(const cpumask_t *src1p,
897 					const cpumask_t *src2p, int nbits)
898 {
899 	return bitmap_equal(src1p->bits, src2p->bits, nbits);
900 }
901 
902 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS)
__cpus_intersects(const cpumask_t * src1p,const cpumask_t * src2p,int nbits)903 static inline int __cpus_intersects(const cpumask_t *src1p,
904 					const cpumask_t *src2p, int nbits)
905 {
906 	return bitmap_intersects(src1p->bits, src2p->bits, nbits);
907 }
908 
909 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS)
__cpus_subset(const cpumask_t * src1p,const cpumask_t * src2p,int nbits)910 static inline int __cpus_subset(const cpumask_t *src1p,
911 					const cpumask_t *src2p, int nbits)
912 {
913 	return bitmap_subset(src1p->bits, src2p->bits, nbits);
914 }
915 
916 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS)
__cpus_empty(const cpumask_t * srcp,int nbits)917 static inline int __cpus_empty(const cpumask_t *srcp, int nbits)
918 {
919 	return bitmap_empty(srcp->bits, nbits);
920 }
921 
922 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS)
__cpus_weight(const cpumask_t * srcp,int nbits)923 static inline int __cpus_weight(const cpumask_t *srcp, int nbits)
924 {
925 	return bitmap_weight(srcp->bits, nbits);
926 }
927 
928 #define cpus_shift_left(dst, src, n) \
929 			__cpus_shift_left(&(dst), &(src), (n), NR_CPUS)
__cpus_shift_left(cpumask_t * dstp,const cpumask_t * srcp,int n,int nbits)930 static inline void __cpus_shift_left(cpumask_t *dstp,
931 					const cpumask_t *srcp, int n, int nbits)
932 {
933 	bitmap_shift_left(dstp->bits, srcp->bits, n, nbits);
934 }
935 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */
936 
937 #endif /* __LINUX_CPUMASK_H */
938