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 */ 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". */ 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. */ 121 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 122 { 123 return n+1; 124 } 125 126 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 127 { 128 return n+1; 129 } 130 131 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. */ 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 */ 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 */ 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 */ 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 */ 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 */ 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 * Returns 1 if @cpu is set in @cpumask, else returns 0 276 * 277 * No static inline type checking - see Subtlety (1) above. 278 */ 279 #define cpumask_test_cpu(cpu, cpumask) \ 280 test_bit(cpumask_check(cpu), cpumask_bits((cpumask))) 281 282 /** 283 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 284 * @cpu: cpu number (< nr_cpu_ids) 285 * @cpumask: the cpumask pointer 286 * 287 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 288 * 289 * test_and_set_bit wrapper for cpumasks. 290 */ 291 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 292 { 293 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 294 } 295 296 /** 297 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 298 * @cpu: cpu number (< nr_cpu_ids) 299 * @cpumask: the cpumask pointer 300 * 301 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 302 * 303 * test_and_clear_bit wrapper for cpumasks. 304 */ 305 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 306 { 307 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 308 } 309 310 /** 311 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 312 * @dstp: the cpumask pointer 313 */ 314 static inline void cpumask_setall(struct cpumask *dstp) 315 { 316 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 317 } 318 319 /** 320 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 321 * @dstp: the cpumask pointer 322 */ 323 static inline void cpumask_clear(struct cpumask *dstp) 324 { 325 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); 326 } 327 328 /** 329 * cpumask_and - *dstp = *src1p & *src2p 330 * @dstp: the cpumask result 331 * @src1p: the first input 332 * @src2p: the second input 333 * 334 * If *@dstp is empty, returns 0, else returns 1 335 */ 336 static inline int cpumask_and(struct cpumask *dstp, 337 const struct cpumask *src1p, 338 const struct cpumask *src2p) 339 { 340 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 341 cpumask_bits(src2p), nr_cpumask_bits); 342 } 343 344 /** 345 * cpumask_or - *dstp = *src1p | *src2p 346 * @dstp: the cpumask result 347 * @src1p: the first input 348 * @src2p: the second input 349 */ 350 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 351 const struct cpumask *src2p) 352 { 353 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 354 cpumask_bits(src2p), nr_cpumask_bits); 355 } 356 357 /** 358 * cpumask_xor - *dstp = *src1p ^ *src2p 359 * @dstp: the cpumask result 360 * @src1p: the first input 361 * @src2p: the second input 362 */ 363 static inline void cpumask_xor(struct cpumask *dstp, 364 const struct cpumask *src1p, 365 const struct cpumask *src2p) 366 { 367 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 368 cpumask_bits(src2p), nr_cpumask_bits); 369 } 370 371 /** 372 * cpumask_andnot - *dstp = *src1p & ~*src2p 373 * @dstp: the cpumask result 374 * @src1p: the first input 375 * @src2p: the second input 376 * 377 * If *@dstp is empty, returns 0, else returns 1 378 */ 379 static inline int cpumask_andnot(struct cpumask *dstp, 380 const struct cpumask *src1p, 381 const struct cpumask *src2p) 382 { 383 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 384 cpumask_bits(src2p), nr_cpumask_bits); 385 } 386 387 /** 388 * cpumask_complement - *dstp = ~*srcp 389 * @dstp: the cpumask result 390 * @srcp: the input to invert 391 */ 392 static inline void cpumask_complement(struct cpumask *dstp, 393 const struct cpumask *srcp) 394 { 395 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), 396 nr_cpumask_bits); 397 } 398 399 /** 400 * cpumask_equal - *src1p == *src2p 401 * @src1p: the first input 402 * @src2p: the second input 403 */ 404 static inline bool cpumask_equal(const struct cpumask *src1p, 405 const struct cpumask *src2p) 406 { 407 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 408 nr_cpumask_bits); 409 } 410 411 /** 412 * cpumask_intersects - (*src1p & *src2p) != 0 413 * @src1p: the first input 414 * @src2p: the second input 415 */ 416 static inline bool cpumask_intersects(const struct cpumask *src1p, 417 const struct cpumask *src2p) 418 { 419 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 420 nr_cpumask_bits); 421 } 422 423 /** 424 * cpumask_subset - (*src1p & ~*src2p) == 0 425 * @src1p: the first input 426 * @src2p: the second input 427 * 428 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0 429 */ 430 static inline int cpumask_subset(const struct cpumask *src1p, 431 const struct cpumask *src2p) 432 { 433 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 434 nr_cpumask_bits); 435 } 436 437 /** 438 * cpumask_empty - *srcp == 0 439 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 440 */ 441 static inline bool cpumask_empty(const struct cpumask *srcp) 442 { 443 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); 444 } 445 446 /** 447 * cpumask_full - *srcp == 0xFFFFFFFF... 448 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 449 */ 450 static inline bool cpumask_full(const struct cpumask *srcp) 451 { 452 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 453 } 454 455 /** 456 * cpumask_weight - Count of bits in *srcp 457 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 458 */ 459 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 460 { 461 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); 462 } 463 464 /** 465 * cpumask_shift_right - *dstp = *srcp >> n 466 * @dstp: the cpumask result 467 * @srcp: the input to shift 468 * @n: the number of bits to shift by 469 */ 470 static inline void cpumask_shift_right(struct cpumask *dstp, 471 const struct cpumask *srcp, int n) 472 { 473 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 474 nr_cpumask_bits); 475 } 476 477 /** 478 * cpumask_shift_left - *dstp = *srcp << n 479 * @dstp: the cpumask result 480 * @srcp: the input to shift 481 * @n: the number of bits to shift by 482 */ 483 static inline void cpumask_shift_left(struct cpumask *dstp, 484 const struct cpumask *srcp, int n) 485 { 486 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 487 nr_cpumask_bits); 488 } 489 490 /** 491 * cpumask_copy - *dstp = *srcp 492 * @dstp: the result 493 * @srcp: the input cpumask 494 */ 495 static inline void cpumask_copy(struct cpumask *dstp, 496 const struct cpumask *srcp) 497 { 498 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); 499 } 500 501 /** 502 * cpumask_any - pick a "random" cpu from *srcp 503 * @srcp: the input cpumask 504 * 505 * Returns >= nr_cpu_ids if no cpus set. 506 */ 507 #define cpumask_any(srcp) cpumask_first(srcp) 508 509 /** 510 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 511 * @src1p: the first input 512 * @src2p: the second input 513 * 514 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 515 */ 516 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) 517 518 /** 519 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 520 * @mask1: the first input cpumask 521 * @mask2: the second input cpumask 522 * 523 * Returns >= nr_cpu_ids if no cpus set. 524 */ 525 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 526 527 /** 528 * cpumask_of - the cpumask containing just a given cpu 529 * @cpu: the cpu (<= nr_cpu_ids) 530 */ 531 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 532 533 /** 534 * cpumask_scnprintf - print a cpumask into a string as comma-separated hex 535 * @buf: the buffer to sprintf into 536 * @len: the length of the buffer 537 * @srcp: the cpumask to print 538 * 539 * If len is zero, returns zero. Otherwise returns the length of the 540 * (nul-terminated) @buf string. 541 */ 542 static inline int cpumask_scnprintf(char *buf, int len, 543 const struct cpumask *srcp) 544 { 545 return bitmap_scnprintf(buf, len, cpumask_bits(srcp), nr_cpumask_bits); 546 } 547 548 /** 549 * cpumask_parse_user - extract a cpumask from a user string 550 * @buf: the buffer to extract from 551 * @len: the length of the buffer 552 * @dstp: the cpumask to set. 553 * 554 * Returns -errno, or 0 for success. 555 */ 556 static inline int cpumask_parse_user(const char __user *buf, int len, 557 struct cpumask *dstp) 558 { 559 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); 560 } 561 562 /** 563 * cpumask_parselist_user - extract a cpumask from a user string 564 * @buf: the buffer to extract from 565 * @len: the length of the buffer 566 * @dstp: the cpumask to set. 567 * 568 * Returns -errno, or 0 for success. 569 */ 570 static inline int cpumask_parselist_user(const char __user *buf, int len, 571 struct cpumask *dstp) 572 { 573 return bitmap_parselist_user(buf, len, cpumask_bits(dstp), 574 nr_cpumask_bits); 575 } 576 577 /** 578 * cpulist_scnprintf - print a cpumask into a string as comma-separated list 579 * @buf: the buffer to sprintf into 580 * @len: the length of the buffer 581 * @srcp: the cpumask to print 582 * 583 * If len is zero, returns zero. Otherwise returns the length of the 584 * (nul-terminated) @buf string. 585 */ 586 static inline int cpulist_scnprintf(char *buf, int len, 587 const struct cpumask *srcp) 588 { 589 return bitmap_scnlistprintf(buf, len, cpumask_bits(srcp), 590 nr_cpumask_bits); 591 } 592 593 /** 594 * cpumask_parse - extract a cpumask from from a string 595 * @buf: the buffer to extract from 596 * @dstp: the cpumask to set. 597 * 598 * Returns -errno, or 0 for success. 599 */ 600 static inline int cpumask_parse(const char *buf, struct cpumask *dstp) 601 { 602 char *nl = strchr(buf, '\n'); 603 int len = nl ? nl - buf : strlen(buf); 604 605 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpumask_bits); 606 } 607 608 /** 609 * cpulist_parse - extract a cpumask from a user string of ranges 610 * @buf: the buffer to extract from 611 * @dstp: the cpumask to set. 612 * 613 * Returns -errno, or 0 for success. 614 */ 615 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 616 { 617 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); 618 } 619 620 /** 621 * cpumask_size - size to allocate for a 'struct cpumask' in bytes 622 * 623 * This will eventually be a runtime variable, depending on nr_cpu_ids. 624 */ 625 static inline size_t cpumask_size(void) 626 { 627 /* FIXME: Once all cpumask assignments are eliminated, this 628 * can be nr_cpumask_bits */ 629 return BITS_TO_LONGS(NR_CPUS) * sizeof(long); 630 } 631 632 /* 633 * cpumask_var_t: struct cpumask for stack usage. 634 * 635 * Oh, the wicked games we play! In order to make kernel coding a 636 * little more difficult, we typedef cpumask_var_t to an array or a 637 * pointer: doing &mask on an array is a noop, so it still works. 638 * 639 * ie. 640 * cpumask_var_t tmpmask; 641 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 642 * return -ENOMEM; 643 * 644 * ... use 'tmpmask' like a normal struct cpumask * ... 645 * 646 * free_cpumask_var(tmpmask); 647 * 648 * 649 * However, one notable exception is there. alloc_cpumask_var() allocates 650 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has 651 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t. 652 * 653 * cpumask_var_t tmpmask; 654 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 655 * return -ENOMEM; 656 * 657 * var = *tmpmask; 658 * 659 * This code makes NR_CPUS length memcopy and brings to a memory corruption. 660 * cpumask_copy() provide safe copy functionality. 661 */ 662 #ifdef CONFIG_CPUMASK_OFFSTACK 663 typedef struct cpumask *cpumask_var_t; 664 665 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 666 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 667 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 668 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 669 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 670 void free_cpumask_var(cpumask_var_t mask); 671 void free_bootmem_cpumask_var(cpumask_var_t mask); 672 673 #else 674 typedef struct cpumask cpumask_var_t[1]; 675 676 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 677 { 678 return true; 679 } 680 681 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 682 int node) 683 { 684 return true; 685 } 686 687 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 688 { 689 cpumask_clear(*mask); 690 return true; 691 } 692 693 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 694 int node) 695 { 696 cpumask_clear(*mask); 697 return true; 698 } 699 700 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 701 { 702 } 703 704 static inline void free_cpumask_var(cpumask_var_t mask) 705 { 706 } 707 708 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 709 { 710 } 711 #endif /* CONFIG_CPUMASK_OFFSTACK */ 712 713 /* It's common to want to use cpu_all_mask in struct member initializers, 714 * so it has to refer to an address rather than a pointer. */ 715 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 716 #define cpu_all_mask to_cpumask(cpu_all_bits) 717 718 /* First bits of cpu_bit_bitmap are in fact unset. */ 719 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 720 721 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 722 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 723 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 724 725 /* Wrappers for arch boot code to manipulate normally-constant masks */ 726 void set_cpu_possible(unsigned int cpu, bool possible); 727 void set_cpu_present(unsigned int cpu, bool present); 728 void set_cpu_online(unsigned int cpu, bool online); 729 void set_cpu_active(unsigned int cpu, bool active); 730 void init_cpu_present(const struct cpumask *src); 731 void init_cpu_possible(const struct cpumask *src); 732 void init_cpu_online(const struct cpumask *src); 733 734 /** 735 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * 736 * @bitmap: the bitmap 737 * 738 * There are a few places where cpumask_var_t isn't appropriate and 739 * static cpumasks must be used (eg. very early boot), yet we don't 740 * expose the definition of 'struct cpumask'. 741 * 742 * This does the conversion, and can be used as a constant initializer. 743 */ 744 #define to_cpumask(bitmap) \ 745 ((struct cpumask *)(1 ? (bitmap) \ 746 : (void *)sizeof(__check_is_bitmap(bitmap)))) 747 748 static inline int __check_is_bitmap(const unsigned long *bitmap) 749 { 750 return 1; 751 } 752 753 /* 754 * Special-case data structure for "single bit set only" constant CPU masks. 755 * 756 * We pre-generate all the 64 (or 32) possible bit positions, with enough 757 * padding to the left and the right, and return the constant pointer 758 * appropriately offset. 759 */ 760 extern const unsigned long 761 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 762 763 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 764 { 765 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 766 p -= cpu / BITS_PER_LONG; 767 return to_cpumask(p); 768 } 769 770 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 771 772 #if NR_CPUS <= BITS_PER_LONG 773 #define CPU_BITS_ALL \ 774 { \ 775 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 776 } 777 778 #else /* NR_CPUS > BITS_PER_LONG */ 779 780 #define CPU_BITS_ALL \ 781 { \ 782 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 783 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 784 } 785 #endif /* NR_CPUS > BITS_PER_LONG */ 786 787 /* 788 * 789 * From here down, all obsolete. Use cpumask_ variants! 790 * 791 */ 792 #ifndef CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS 793 #define cpumask_of_cpu(cpu) (*get_cpu_mask(cpu)) 794 795 #define CPU_MASK_LAST_WORD BITMAP_LAST_WORD_MASK(NR_CPUS) 796 797 #if NR_CPUS <= BITS_PER_LONG 798 799 #define CPU_MASK_ALL \ 800 (cpumask_t) { { \ 801 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 802 } } 803 804 #else 805 806 #define CPU_MASK_ALL \ 807 (cpumask_t) { { \ 808 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 809 [BITS_TO_LONGS(NR_CPUS)-1] = CPU_MASK_LAST_WORD \ 810 } } 811 812 #endif 813 814 #define CPU_MASK_NONE \ 815 (cpumask_t) { { \ 816 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 817 } } 818 819 #define CPU_MASK_CPU0 \ 820 (cpumask_t) { { \ 821 [0] = 1UL \ 822 } } 823 824 #if NR_CPUS == 1 825 #define first_cpu(src) ({ (void)(src); 0; }) 826 #define next_cpu(n, src) ({ (void)(src); 1; }) 827 #define any_online_cpu(mask) 0 828 #define for_each_cpu_mask(cpu, mask) \ 829 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 830 #else /* NR_CPUS > 1 */ 831 int __first_cpu(const cpumask_t *srcp); 832 int __next_cpu(int n, const cpumask_t *srcp); 833 834 #define first_cpu(src) __first_cpu(&(src)) 835 #define next_cpu(n, src) __next_cpu((n), &(src)) 836 #define any_online_cpu(mask) cpumask_any_and(&mask, cpu_online_mask) 837 #define for_each_cpu_mask(cpu, mask) \ 838 for ((cpu) = -1; \ 839 (cpu) = next_cpu((cpu), (mask)), \ 840 (cpu) < NR_CPUS; ) 841 #endif /* SMP */ 842 843 #if NR_CPUS <= 64 844 845 #define for_each_cpu_mask_nr(cpu, mask) for_each_cpu_mask(cpu, mask) 846 847 #else /* NR_CPUS > 64 */ 848 849 int __next_cpu_nr(int n, const cpumask_t *srcp); 850 #define for_each_cpu_mask_nr(cpu, mask) \ 851 for ((cpu) = -1; \ 852 (cpu) = __next_cpu_nr((cpu), &(mask)), \ 853 (cpu) < nr_cpu_ids; ) 854 855 #endif /* NR_CPUS > 64 */ 856 857 #define cpus_addr(src) ((src).bits) 858 859 #define cpu_set(cpu, dst) __cpu_set((cpu), &(dst)) 860 static inline void __cpu_set(int cpu, volatile cpumask_t *dstp) 861 { 862 set_bit(cpu, dstp->bits); 863 } 864 865 #define cpu_clear(cpu, dst) __cpu_clear((cpu), &(dst)) 866 static inline void __cpu_clear(int cpu, volatile cpumask_t *dstp) 867 { 868 clear_bit(cpu, dstp->bits); 869 } 870 871 #define cpus_setall(dst) __cpus_setall(&(dst), NR_CPUS) 872 static inline void __cpus_setall(cpumask_t *dstp, int nbits) 873 { 874 bitmap_fill(dstp->bits, nbits); 875 } 876 877 #define cpus_clear(dst) __cpus_clear(&(dst), NR_CPUS) 878 static inline void __cpus_clear(cpumask_t *dstp, int nbits) 879 { 880 bitmap_zero(dstp->bits, nbits); 881 } 882 883 /* No static inline type checking - see Subtlety (1) above. */ 884 #define cpu_isset(cpu, cpumask) test_bit((cpu), (cpumask).bits) 885 886 #define cpu_test_and_set(cpu, cpumask) __cpu_test_and_set((cpu), &(cpumask)) 887 static inline int __cpu_test_and_set(int cpu, cpumask_t *addr) 888 { 889 return test_and_set_bit(cpu, addr->bits); 890 } 891 892 #define cpus_and(dst, src1, src2) __cpus_and(&(dst), &(src1), &(src2), NR_CPUS) 893 static inline int __cpus_and(cpumask_t *dstp, const cpumask_t *src1p, 894 const cpumask_t *src2p, int nbits) 895 { 896 return bitmap_and(dstp->bits, src1p->bits, src2p->bits, nbits); 897 } 898 899 #define cpus_or(dst, src1, src2) __cpus_or(&(dst), &(src1), &(src2), NR_CPUS) 900 static inline void __cpus_or(cpumask_t *dstp, const cpumask_t *src1p, 901 const cpumask_t *src2p, int nbits) 902 { 903 bitmap_or(dstp->bits, src1p->bits, src2p->bits, nbits); 904 } 905 906 #define cpus_xor(dst, src1, src2) __cpus_xor(&(dst), &(src1), &(src2), NR_CPUS) 907 static inline void __cpus_xor(cpumask_t *dstp, const cpumask_t *src1p, 908 const cpumask_t *src2p, int nbits) 909 { 910 bitmap_xor(dstp->bits, src1p->bits, src2p->bits, nbits); 911 } 912 913 #define cpus_andnot(dst, src1, src2) \ 914 __cpus_andnot(&(dst), &(src1), &(src2), NR_CPUS) 915 static inline int __cpus_andnot(cpumask_t *dstp, const cpumask_t *src1p, 916 const cpumask_t *src2p, int nbits) 917 { 918 return bitmap_andnot(dstp->bits, src1p->bits, src2p->bits, nbits); 919 } 920 921 #define cpus_equal(src1, src2) __cpus_equal(&(src1), &(src2), NR_CPUS) 922 static inline int __cpus_equal(const cpumask_t *src1p, 923 const cpumask_t *src2p, int nbits) 924 { 925 return bitmap_equal(src1p->bits, src2p->bits, nbits); 926 } 927 928 #define cpus_intersects(src1, src2) __cpus_intersects(&(src1), &(src2), NR_CPUS) 929 static inline int __cpus_intersects(const cpumask_t *src1p, 930 const cpumask_t *src2p, int nbits) 931 { 932 return bitmap_intersects(src1p->bits, src2p->bits, nbits); 933 } 934 935 #define cpus_subset(src1, src2) __cpus_subset(&(src1), &(src2), NR_CPUS) 936 static inline int __cpus_subset(const cpumask_t *src1p, 937 const cpumask_t *src2p, int nbits) 938 { 939 return bitmap_subset(src1p->bits, src2p->bits, nbits); 940 } 941 942 #define cpus_empty(src) __cpus_empty(&(src), NR_CPUS) 943 static inline int __cpus_empty(const cpumask_t *srcp, int nbits) 944 { 945 return bitmap_empty(srcp->bits, nbits); 946 } 947 948 #define cpus_weight(cpumask) __cpus_weight(&(cpumask), NR_CPUS) 949 static inline int __cpus_weight(const cpumask_t *srcp, int nbits) 950 { 951 return bitmap_weight(srcp->bits, nbits); 952 } 953 954 #define cpus_shift_left(dst, src, n) \ 955 __cpus_shift_left(&(dst), &(src), (n), NR_CPUS) 956 static inline void __cpus_shift_left(cpumask_t *dstp, 957 const cpumask_t *srcp, int n, int nbits) 958 { 959 bitmap_shift_left(dstp->bits, srcp->bits, n, nbits); 960 } 961 #endif /* !CONFIG_DISABLE_OBSOLETE_CPUMASK_FUNCTIONS */ 962 963 #endif /* __LINUX_CPUMASK_H */ 964