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 /* Don't assign or return these: may not be this big! */ 15 typedef struct cpumask { DECLARE_BITMAP(bits, NR_CPUS); } cpumask_t; 16 17 /** 18 * cpumask_bits - get the bits in a cpumask 19 * @maskp: the struct cpumask * 20 * 21 * You should only assume nr_cpu_ids bits of this mask are valid. This is 22 * a macro so it's const-correct. 23 */ 24 #define cpumask_bits(maskp) ((maskp)->bits) 25 26 /** 27 * cpumask_pr_args - printf args to output a cpumask 28 * @maskp: cpumask to be printed 29 * 30 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask. 31 */ 32 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp) 33 34 #if NR_CPUS == 1 35 #define nr_cpu_ids 1 36 #else 37 extern int nr_cpu_ids; 38 #endif 39 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 44 #else 45 #define nr_cpumask_bits NR_CPUS 46 #endif 47 48 /* 49 * The following particular system cpumasks and operations manage 50 * possible, present, active and online cpus. 51 * 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 56 * 57 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. 58 * 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. 65 * 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. 69 * 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. 73 * 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. 76 * 77 * Subtleties: 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 85 * only one CPU. 86 */ 87 88 extern const struct cpumask *const cpu_possible_mask; 89 extern const struct cpumask *const cpu_online_mask; 90 extern const struct cpumask *const cpu_present_mask; 91 extern const struct cpumask *const cpu_active_mask; 92 93 #if NR_CPUS > 1 94 #define num_online_cpus() cpumask_weight(cpu_online_mask) 95 #define num_possible_cpus() cpumask_weight(cpu_possible_mask) 96 #define num_present_cpus() cpumask_weight(cpu_present_mask) 97 #define num_active_cpus() cpumask_weight(cpu_active_mask) 98 #define cpu_online(cpu) cpumask_test_cpu((cpu), cpu_online_mask) 99 #define cpu_possible(cpu) cpumask_test_cpu((cpu), cpu_possible_mask) 100 #define cpu_present(cpu) cpumask_test_cpu((cpu), cpu_present_mask) 101 #define cpu_active(cpu) cpumask_test_cpu((cpu), cpu_active_mask) 102 #else 103 #define num_online_cpus() 1U 104 #define num_possible_cpus() 1U 105 #define num_present_cpus() 1U 106 #define num_active_cpus() 1U 107 #define cpu_online(cpu) ((cpu) == 0) 108 #define cpu_possible(cpu) ((cpu) == 0) 109 #define cpu_present(cpu) ((cpu) == 0) 110 #define cpu_active(cpu) ((cpu) == 0) 111 #endif 112 113 /* verify cpu argument to cpumask_* operators */ 114 static inline unsigned int cpumask_check(unsigned int cpu) 115 { 116 #ifdef CONFIG_DEBUG_PER_CPU_MAPS 117 WARN_ON_ONCE(cpu >= nr_cpumask_bits); 118 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ 119 return cpu; 120 } 121 122 #if NR_CPUS == 1 123 /* Uniprocessor. Assume all masks are "1". */ 124 static inline unsigned int cpumask_first(const struct cpumask *srcp) 125 { 126 return 0; 127 } 128 129 /* Valid inputs for n are -1 and 0. */ 130 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 131 { 132 return n+1; 133 } 134 135 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 136 { 137 return n+1; 138 } 139 140 static inline unsigned int cpumask_next_and(int n, 141 const struct cpumask *srcp, 142 const struct cpumask *andp) 143 { 144 return n+1; 145 } 146 147 /* cpu must be a valid cpu, ie 0, so there's no other choice. */ 148 static inline unsigned int cpumask_any_but(const struct cpumask *mask, 149 unsigned int cpu) 150 { 151 return 1; 152 } 153 154 static inline unsigned int cpumask_local_spread(unsigned int i, int node) 155 { 156 return 0; 157 } 158 159 #define for_each_cpu(cpu, mask) \ 160 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 161 #define for_each_cpu_not(cpu, mask) \ 162 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask) 163 #define for_each_cpu_and(cpu, mask, and) \ 164 for ((cpu) = 0; (cpu) < 1; (cpu)++, (void)mask, (void)and) 165 #else 166 /** 167 * cpumask_first - get the first cpu in a cpumask 168 * @srcp: the cpumask pointer 169 * 170 * Returns >= nr_cpu_ids if no cpus set. 171 */ 172 static inline unsigned int cpumask_first(const struct cpumask *srcp) 173 { 174 return find_first_bit(cpumask_bits(srcp), nr_cpumask_bits); 175 } 176 177 /** 178 * cpumask_next - get the next cpu in a cpumask 179 * @n: the cpu prior to the place to search (ie. return will be > @n) 180 * @srcp: the cpumask pointer 181 * 182 * Returns >= nr_cpu_ids if no further cpus set. 183 */ 184 static inline unsigned int cpumask_next(int n, const struct cpumask *srcp) 185 { 186 /* -1 is a legal arg here. */ 187 if (n != -1) 188 cpumask_check(n); 189 return find_next_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 190 } 191 192 /** 193 * cpumask_next_zero - get the next unset cpu in a cpumask 194 * @n: the cpu prior to the place to search (ie. return will be > @n) 195 * @srcp: the cpumask pointer 196 * 197 * Returns >= nr_cpu_ids if no further cpus unset. 198 */ 199 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 200 { 201 /* -1 is a legal arg here. */ 202 if (n != -1) 203 cpumask_check(n); 204 return find_next_zero_bit(cpumask_bits(srcp), nr_cpumask_bits, n+1); 205 } 206 207 int cpumask_next_and(int n, const struct cpumask *, const struct cpumask *); 208 int cpumask_any_but(const struct cpumask *mask, unsigned int cpu); 209 unsigned int cpumask_local_spread(unsigned int i, int node); 210 211 /** 212 * for_each_cpu - iterate over every cpu in a mask 213 * @cpu: the (optionally unsigned) integer iterator 214 * @mask: the cpumask pointer 215 * 216 * After the loop, cpu is >= nr_cpu_ids. 217 */ 218 #define for_each_cpu(cpu, mask) \ 219 for ((cpu) = -1; \ 220 (cpu) = cpumask_next((cpu), (mask)), \ 221 (cpu) < nr_cpu_ids;) 222 223 /** 224 * for_each_cpu_not - iterate over every cpu in a complemented mask 225 * @cpu: the (optionally unsigned) integer iterator 226 * @mask: the cpumask pointer 227 * 228 * After the loop, cpu is >= nr_cpu_ids. 229 */ 230 #define for_each_cpu_not(cpu, mask) \ 231 for ((cpu) = -1; \ 232 (cpu) = cpumask_next_zero((cpu), (mask)), \ 233 (cpu) < nr_cpu_ids;) 234 235 /** 236 * for_each_cpu_and - iterate over every cpu in both masks 237 * @cpu: the (optionally unsigned) integer iterator 238 * @mask: the first cpumask pointer 239 * @and: the second cpumask pointer 240 * 241 * This saves a temporary CPU mask in many places. It is equivalent to: 242 * struct cpumask tmp; 243 * cpumask_and(&tmp, &mask, &and); 244 * for_each_cpu(cpu, &tmp) 245 * ... 246 * 247 * After the loop, cpu is >= nr_cpu_ids. 248 */ 249 #define for_each_cpu_and(cpu, mask, and) \ 250 for ((cpu) = -1; \ 251 (cpu) = cpumask_next_and((cpu), (mask), (and)), \ 252 (cpu) < nr_cpu_ids;) 253 #endif /* SMP */ 254 255 #define CPU_BITS_NONE \ 256 { \ 257 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 258 } 259 260 #define CPU_BITS_CPU0 \ 261 { \ 262 [0] = 1UL \ 263 } 264 265 /** 266 * cpumask_set_cpu - set a cpu in a cpumask 267 * @cpu: cpu number (< nr_cpu_ids) 268 * @dstp: the cpumask pointer 269 */ 270 static inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 271 { 272 set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 273 } 274 275 /** 276 * cpumask_clear_cpu - clear a cpu in a cpumask 277 * @cpu: cpu number (< nr_cpu_ids) 278 * @dstp: the cpumask pointer 279 */ 280 static inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) 281 { 282 clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 283 } 284 285 /** 286 * cpumask_test_cpu - test for a cpu in a cpumask 287 * @cpu: cpu number (< nr_cpu_ids) 288 * @cpumask: the cpumask pointer 289 * 290 * Returns 1 if @cpu is set in @cpumask, else returns 0 291 */ 292 static inline int cpumask_test_cpu(int cpu, const struct cpumask *cpumask) 293 { 294 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask))); 295 } 296 297 /** 298 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 299 * @cpu: cpu number (< nr_cpu_ids) 300 * @cpumask: the cpumask pointer 301 * 302 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 303 * 304 * test_and_set_bit wrapper for cpumasks. 305 */ 306 static inline int cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 307 { 308 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 309 } 310 311 /** 312 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 313 * @cpu: cpu number (< nr_cpu_ids) 314 * @cpumask: the cpumask pointer 315 * 316 * Returns 1 if @cpu is set in old bitmap of @cpumask, else returns 0 317 * 318 * test_and_clear_bit wrapper for cpumasks. 319 */ 320 static inline int cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 321 { 322 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 323 } 324 325 /** 326 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 327 * @dstp: the cpumask pointer 328 */ 329 static inline void cpumask_setall(struct cpumask *dstp) 330 { 331 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 332 } 333 334 /** 335 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 336 * @dstp: the cpumask pointer 337 */ 338 static inline void cpumask_clear(struct cpumask *dstp) 339 { 340 bitmap_zero(cpumask_bits(dstp), nr_cpumask_bits); 341 } 342 343 /** 344 * cpumask_and - *dstp = *src1p & *src2p 345 * @dstp: the cpumask result 346 * @src1p: the first input 347 * @src2p: the second input 348 * 349 * If *@dstp is empty, returns 0, else returns 1 350 */ 351 static inline int cpumask_and(struct cpumask *dstp, 352 const struct cpumask *src1p, 353 const struct cpumask *src2p) 354 { 355 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 356 cpumask_bits(src2p), nr_cpumask_bits); 357 } 358 359 /** 360 * cpumask_or - *dstp = *src1p | *src2p 361 * @dstp: the cpumask result 362 * @src1p: the first input 363 * @src2p: the second input 364 */ 365 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 366 const struct cpumask *src2p) 367 { 368 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 369 cpumask_bits(src2p), nr_cpumask_bits); 370 } 371 372 /** 373 * cpumask_xor - *dstp = *src1p ^ *src2p 374 * @dstp: the cpumask result 375 * @src1p: the first input 376 * @src2p: the second input 377 */ 378 static inline void cpumask_xor(struct cpumask *dstp, 379 const struct cpumask *src1p, 380 const struct cpumask *src2p) 381 { 382 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 383 cpumask_bits(src2p), nr_cpumask_bits); 384 } 385 386 /** 387 * cpumask_andnot - *dstp = *src1p & ~*src2p 388 * @dstp: the cpumask result 389 * @src1p: the first input 390 * @src2p: the second input 391 * 392 * If *@dstp is empty, returns 0, else returns 1 393 */ 394 static inline int cpumask_andnot(struct cpumask *dstp, 395 const struct cpumask *src1p, 396 const struct cpumask *src2p) 397 { 398 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 399 cpumask_bits(src2p), nr_cpumask_bits); 400 } 401 402 /** 403 * cpumask_complement - *dstp = ~*srcp 404 * @dstp: the cpumask result 405 * @srcp: the input to invert 406 */ 407 static inline void cpumask_complement(struct cpumask *dstp, 408 const struct cpumask *srcp) 409 { 410 bitmap_complement(cpumask_bits(dstp), cpumask_bits(srcp), 411 nr_cpumask_bits); 412 } 413 414 /** 415 * cpumask_equal - *src1p == *src2p 416 * @src1p: the first input 417 * @src2p: the second input 418 */ 419 static inline bool cpumask_equal(const struct cpumask *src1p, 420 const struct cpumask *src2p) 421 { 422 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 423 nr_cpumask_bits); 424 } 425 426 /** 427 * cpumask_intersects - (*src1p & *src2p) != 0 428 * @src1p: the first input 429 * @src2p: the second input 430 */ 431 static inline bool cpumask_intersects(const struct cpumask *src1p, 432 const struct cpumask *src2p) 433 { 434 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 435 nr_cpumask_bits); 436 } 437 438 /** 439 * cpumask_subset - (*src1p & ~*src2p) == 0 440 * @src1p: the first input 441 * @src2p: the second input 442 * 443 * Returns 1 if *@src1p is a subset of *@src2p, else returns 0 444 */ 445 static inline int cpumask_subset(const struct cpumask *src1p, 446 const struct cpumask *src2p) 447 { 448 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 449 nr_cpumask_bits); 450 } 451 452 /** 453 * cpumask_empty - *srcp == 0 454 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 455 */ 456 static inline bool cpumask_empty(const struct cpumask *srcp) 457 { 458 return bitmap_empty(cpumask_bits(srcp), nr_cpumask_bits); 459 } 460 461 /** 462 * cpumask_full - *srcp == 0xFFFFFFFF... 463 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 464 */ 465 static inline bool cpumask_full(const struct cpumask *srcp) 466 { 467 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 468 } 469 470 /** 471 * cpumask_weight - Count of bits in *srcp 472 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 473 */ 474 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 475 { 476 return bitmap_weight(cpumask_bits(srcp), nr_cpumask_bits); 477 } 478 479 /** 480 * cpumask_shift_right - *dstp = *srcp >> n 481 * @dstp: the cpumask result 482 * @srcp: the input to shift 483 * @n: the number of bits to shift by 484 */ 485 static inline void cpumask_shift_right(struct cpumask *dstp, 486 const struct cpumask *srcp, int n) 487 { 488 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 489 nr_cpumask_bits); 490 } 491 492 /** 493 * cpumask_shift_left - *dstp = *srcp << n 494 * @dstp: the cpumask result 495 * @srcp: the input to shift 496 * @n: the number of bits to shift by 497 */ 498 static inline void cpumask_shift_left(struct cpumask *dstp, 499 const struct cpumask *srcp, int n) 500 { 501 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 502 nr_cpumask_bits); 503 } 504 505 /** 506 * cpumask_copy - *dstp = *srcp 507 * @dstp: the result 508 * @srcp: the input cpumask 509 */ 510 static inline void cpumask_copy(struct cpumask *dstp, 511 const struct cpumask *srcp) 512 { 513 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), nr_cpumask_bits); 514 } 515 516 /** 517 * cpumask_any - pick a "random" cpu from *srcp 518 * @srcp: the input cpumask 519 * 520 * Returns >= nr_cpu_ids if no cpus set. 521 */ 522 #define cpumask_any(srcp) cpumask_first(srcp) 523 524 /** 525 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 526 * @src1p: the first input 527 * @src2p: the second input 528 * 529 * Returns >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 530 */ 531 #define cpumask_first_and(src1p, src2p) cpumask_next_and(-1, (src1p), (src2p)) 532 533 /** 534 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 535 * @mask1: the first input cpumask 536 * @mask2: the second input cpumask 537 * 538 * Returns >= nr_cpu_ids if no cpus set. 539 */ 540 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 541 542 /** 543 * cpumask_of - the cpumask containing just a given cpu 544 * @cpu: the cpu (<= nr_cpu_ids) 545 */ 546 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 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_cpu_ids); 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_cpu_ids); 575 } 576 577 /** 578 * cpumask_parse - extract a cpumask from from a string 579 * @buf: the buffer to extract from 580 * @dstp: the cpumask to set. 581 * 582 * Returns -errno, or 0 for success. 583 */ 584 static inline int cpumask_parse(const char *buf, struct cpumask *dstp) 585 { 586 char *nl = strchr(buf, '\n'); 587 unsigned int len = nl ? (unsigned int)(nl - buf) : strlen(buf); 588 589 return bitmap_parse(buf, len, cpumask_bits(dstp), nr_cpu_ids); 590 } 591 592 /** 593 * cpulist_parse - extract a cpumask from a user string of ranges 594 * @buf: the buffer to extract from 595 * @dstp: the cpumask to set. 596 * 597 * Returns -errno, or 0 for success. 598 */ 599 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 600 { 601 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpu_ids); 602 } 603 604 /** 605 * cpumask_size - size to allocate for a 'struct cpumask' in bytes 606 * 607 * This will eventually be a runtime variable, depending on nr_cpu_ids. 608 */ 609 static inline size_t cpumask_size(void) 610 { 611 return BITS_TO_LONGS(nr_cpumask_bits) * sizeof(long); 612 } 613 614 /* 615 * cpumask_var_t: struct cpumask for stack usage. 616 * 617 * Oh, the wicked games we play! In order to make kernel coding a 618 * little more difficult, we typedef cpumask_var_t to an array or a 619 * pointer: doing &mask on an array is a noop, so it still works. 620 * 621 * ie. 622 * cpumask_var_t tmpmask; 623 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 624 * return -ENOMEM; 625 * 626 * ... use 'tmpmask' like a normal struct cpumask * ... 627 * 628 * free_cpumask_var(tmpmask); 629 * 630 * 631 * However, one notable exception is there. alloc_cpumask_var() allocates 632 * only nr_cpumask_bits bits (in the other hand, real cpumask_t always has 633 * NR_CPUS bits). Therefore you don't have to dereference cpumask_var_t. 634 * 635 * cpumask_var_t tmpmask; 636 * if (!alloc_cpumask_var(&tmpmask, GFP_KERNEL)) 637 * return -ENOMEM; 638 * 639 * var = *tmpmask; 640 * 641 * This code makes NR_CPUS length memcopy and brings to a memory corruption. 642 * cpumask_copy() provide safe copy functionality. 643 * 644 * Note that there is another evil here: If you define a cpumask_var_t 645 * as a percpu variable then the way to obtain the address of the cpumask 646 * structure differently influences what this_cpu_* operation needs to be 647 * used. Please use this_cpu_cpumask_var_t in those cases. The direct use 648 * of this_cpu_ptr() or this_cpu_read() will lead to failures when the 649 * other type of cpumask_var_t implementation is configured. 650 */ 651 #ifdef CONFIG_CPUMASK_OFFSTACK 652 typedef struct cpumask *cpumask_var_t; 653 654 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) 655 656 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 657 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 658 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 659 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags); 660 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 661 void free_cpumask_var(cpumask_var_t mask); 662 void free_bootmem_cpumask_var(cpumask_var_t mask); 663 664 #else 665 typedef struct cpumask cpumask_var_t[1]; 666 667 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) 668 669 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 670 { 671 return true; 672 } 673 674 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 675 int node) 676 { 677 return true; 678 } 679 680 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 681 { 682 cpumask_clear(*mask); 683 return true; 684 } 685 686 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 687 int node) 688 { 689 cpumask_clear(*mask); 690 return true; 691 } 692 693 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 694 { 695 } 696 697 static inline void free_cpumask_var(cpumask_var_t mask) 698 { 699 } 700 701 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 702 { 703 } 704 #endif /* CONFIG_CPUMASK_OFFSTACK */ 705 706 /* It's common to want to use cpu_all_mask in struct member initializers, 707 * so it has to refer to an address rather than a pointer. */ 708 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 709 #define cpu_all_mask to_cpumask(cpu_all_bits) 710 711 /* First bits of cpu_bit_bitmap are in fact unset. */ 712 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 713 714 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 715 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 716 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 717 718 /* Wrappers for arch boot code to manipulate normally-constant masks */ 719 void set_cpu_possible(unsigned int cpu, bool possible); 720 void set_cpu_present(unsigned int cpu, bool present); 721 void set_cpu_online(unsigned int cpu, bool online); 722 void set_cpu_active(unsigned int cpu, bool active); 723 void init_cpu_present(const struct cpumask *src); 724 void init_cpu_possible(const struct cpumask *src); 725 void init_cpu_online(const struct cpumask *src); 726 727 /** 728 * to_cpumask - convert an NR_CPUS bitmap to a struct cpumask * 729 * @bitmap: the bitmap 730 * 731 * There are a few places where cpumask_var_t isn't appropriate and 732 * static cpumasks must be used (eg. very early boot), yet we don't 733 * expose the definition of 'struct cpumask'. 734 * 735 * This does the conversion, and can be used as a constant initializer. 736 */ 737 #define to_cpumask(bitmap) \ 738 ((struct cpumask *)(1 ? (bitmap) \ 739 : (void *)sizeof(__check_is_bitmap(bitmap)))) 740 741 static inline int __check_is_bitmap(const unsigned long *bitmap) 742 { 743 return 1; 744 } 745 746 /* 747 * Special-case data structure for "single bit set only" constant CPU masks. 748 * 749 * We pre-generate all the 64 (or 32) possible bit positions, with enough 750 * padding to the left and the right, and return the constant pointer 751 * appropriately offset. 752 */ 753 extern const unsigned long 754 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 755 756 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 757 { 758 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 759 p -= cpu / BITS_PER_LONG; 760 return to_cpumask(p); 761 } 762 763 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 764 765 #if NR_CPUS <= BITS_PER_LONG 766 #define CPU_BITS_ALL \ 767 { \ 768 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 769 } 770 771 #else /* NR_CPUS > BITS_PER_LONG */ 772 773 #define CPU_BITS_ALL \ 774 { \ 775 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 776 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 777 } 778 #endif /* NR_CPUS > BITS_PER_LONG */ 779 780 /** 781 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either 782 * as comma-separated list of cpus or hex values of cpumask 783 * @list: indicates whether the cpumap must be list 784 * @mask: the cpumask to copy 785 * @buf: the buffer to copy into 786 * 787 * Returns the length of the (null-terminated) @buf string, zero if 788 * nothing is copied. 789 */ 790 static inline ssize_t 791 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) 792 { 793 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask), 794 nr_cpu_ids); 795 } 796 797 #if NR_CPUS <= BITS_PER_LONG 798 #define CPU_MASK_ALL \ 799 (cpumask_t) { { \ 800 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 801 } } 802 #else 803 #define CPU_MASK_ALL \ 804 (cpumask_t) { { \ 805 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 806 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 807 } } 808 #endif /* NR_CPUS > BITS_PER_LONG */ 809 810 #define CPU_MASK_NONE \ 811 (cpumask_t) { { \ 812 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 813 } } 814 815 #define CPU_MASK_CPU0 \ 816 (cpumask_t) { { \ 817 [0] = 1UL \ 818 } } 819 820 #endif /* __LINUX_CPUMASK_H */ 821