1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __LINUX_CPUMASK_H 3 #define __LINUX_CPUMASK_H 4 5 /* 6 * Cpumasks provide a bitmap suitable for representing the 7 * set of CPUs in a system, one bit position per CPU number. In general, 8 * only nr_cpu_ids (<= NR_CPUS) bits are valid. 9 */ 10 #include <linux/cleanup.h> 11 #include <linux/kernel.h> 12 #include <linux/bitmap.h> 13 #include <linux/cpumask_types.h> 14 #include <linux/atomic.h> 15 #include <linux/bug.h> 16 #include <linux/gfp_types.h> 17 #include <linux/numa.h> 18 19 /** 20 * cpumask_pr_args - printf args to output a cpumask 21 * @maskp: cpumask to be printed 22 * 23 * Can be used to provide arguments for '%*pb[l]' when printing a cpumask. 24 */ 25 #define cpumask_pr_args(maskp) nr_cpu_ids, cpumask_bits(maskp) 26 27 #if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS) 28 #define nr_cpu_ids ((unsigned int)NR_CPUS) 29 #else 30 extern unsigned int nr_cpu_ids; 31 #endif 32 33 static inline void set_nr_cpu_ids(unsigned int nr) 34 { 35 #if (NR_CPUS == 1) || defined(CONFIG_FORCE_NR_CPUS) 36 WARN_ON(nr != nr_cpu_ids); 37 #else 38 nr_cpu_ids = nr; 39 #endif 40 } 41 42 /* 43 * We have several different "preferred sizes" for the cpumask 44 * operations, depending on operation. 45 * 46 * For example, the bitmap scanning and operating operations have 47 * optimized routines that work for the single-word case, but only when 48 * the size is constant. So if NR_CPUS fits in one single word, we are 49 * better off using that small constant, in order to trigger the 50 * optimized bit finding. That is 'small_cpumask_size'. 51 * 52 * The clearing and copying operations will similarly perform better 53 * with a constant size, but we limit that size arbitrarily to four 54 * words. We call this 'large_cpumask_size'. 55 * 56 * Finally, some operations just want the exact limit, either because 57 * they set bits or just don't have any faster fixed-sized versions. We 58 * call this just 'nr_cpumask_bits'. 59 * 60 * Note that these optional constants are always guaranteed to be at 61 * least as big as 'nr_cpu_ids' itself is, and all our cpumask 62 * allocations are at least that size (see cpumask_size()). The 63 * optimization comes from being able to potentially use a compile-time 64 * constant instead of a run-time generated exact number of CPUs. 65 */ 66 #if NR_CPUS <= BITS_PER_LONG 67 #define small_cpumask_bits ((unsigned int)NR_CPUS) 68 #define large_cpumask_bits ((unsigned int)NR_CPUS) 69 #elif NR_CPUS <= 4*BITS_PER_LONG 70 #define small_cpumask_bits nr_cpu_ids 71 #define large_cpumask_bits ((unsigned int)NR_CPUS) 72 #else 73 #define small_cpumask_bits nr_cpu_ids 74 #define large_cpumask_bits nr_cpu_ids 75 #endif 76 #define nr_cpumask_bits nr_cpu_ids 77 78 /* 79 * The following particular system cpumasks and operations manage 80 * possible, present, active and online cpus. 81 * 82 * cpu_possible_mask- has bit 'cpu' set iff cpu is populatable 83 * cpu_present_mask - has bit 'cpu' set iff cpu is populated 84 * cpu_enabled_mask - has bit 'cpu' set iff cpu can be brought online 85 * cpu_online_mask - has bit 'cpu' set iff cpu available to scheduler 86 * cpu_active_mask - has bit 'cpu' set iff cpu available to migration 87 * 88 * If !CONFIG_HOTPLUG_CPU, present == possible, and active == online. 89 * 90 * The cpu_possible_mask is fixed at boot time, as the set of CPU IDs 91 * that it is possible might ever be plugged in at anytime during the 92 * life of that system boot. The cpu_present_mask is dynamic(*), 93 * representing which CPUs are currently plugged in. And 94 * cpu_online_mask is the dynamic subset of cpu_present_mask, 95 * indicating those CPUs available for scheduling. 96 * 97 * If HOTPLUG is enabled, then cpu_present_mask varies dynamically, 98 * depending on what ACPI reports as currently plugged in, otherwise 99 * cpu_present_mask is just a copy of cpu_possible_mask. 100 * 101 * (*) Well, cpu_present_mask is dynamic in the hotplug case. If not 102 * hotplug, it's a copy of cpu_possible_mask, hence fixed at boot. 103 * 104 * Subtleties: 105 * 1) UP ARCHes (NR_CPUS == 1, CONFIG_SMP not defined) hardcode 106 * assumption that their single CPU is online. The UP 107 * cpu_{online,possible,present}_masks are placebos. Changing them 108 * will have no useful affect on the following num_*_cpus() 109 * and cpu_*() macros in the UP case. This ugliness is a UP 110 * optimization - don't waste any instructions or memory references 111 * asking if you're online or how many CPUs there are if there is 112 * only one CPU. 113 */ 114 115 extern struct cpumask __cpu_possible_mask; 116 extern struct cpumask __cpu_online_mask; 117 extern struct cpumask __cpu_enabled_mask; 118 extern struct cpumask __cpu_present_mask; 119 extern struct cpumask __cpu_active_mask; 120 extern struct cpumask __cpu_dying_mask; 121 #define cpu_possible_mask ((const struct cpumask *)&__cpu_possible_mask) 122 #define cpu_online_mask ((const struct cpumask *)&__cpu_online_mask) 123 #define cpu_enabled_mask ((const struct cpumask *)&__cpu_enabled_mask) 124 #define cpu_present_mask ((const struct cpumask *)&__cpu_present_mask) 125 #define cpu_active_mask ((const struct cpumask *)&__cpu_active_mask) 126 #define cpu_dying_mask ((const struct cpumask *)&__cpu_dying_mask) 127 128 extern atomic_t __num_online_cpus; 129 130 extern cpumask_t cpus_booted_once_mask; 131 132 static __always_inline void cpu_max_bits_warn(unsigned int cpu, unsigned int bits) 133 { 134 #ifdef CONFIG_DEBUG_PER_CPU_MAPS 135 WARN_ON_ONCE(cpu >= bits); 136 #endif /* CONFIG_DEBUG_PER_CPU_MAPS */ 137 } 138 139 /* verify cpu argument to cpumask_* operators */ 140 static __always_inline unsigned int cpumask_check(unsigned int cpu) 141 { 142 cpu_max_bits_warn(cpu, small_cpumask_bits); 143 return cpu; 144 } 145 146 /** 147 * cpumask_first - get the first cpu in a cpumask 148 * @srcp: the cpumask pointer 149 * 150 * Return: >= nr_cpu_ids if no cpus set. 151 */ 152 static inline unsigned int cpumask_first(const struct cpumask *srcp) 153 { 154 return find_first_bit(cpumask_bits(srcp), small_cpumask_bits); 155 } 156 157 /** 158 * cpumask_first_zero - get the first unset cpu in a cpumask 159 * @srcp: the cpumask pointer 160 * 161 * Return: >= nr_cpu_ids if all cpus are set. 162 */ 163 static inline unsigned int cpumask_first_zero(const struct cpumask *srcp) 164 { 165 return find_first_zero_bit(cpumask_bits(srcp), small_cpumask_bits); 166 } 167 168 /** 169 * cpumask_first_and - return the first cpu from *srcp1 & *srcp2 170 * @srcp1: the first input 171 * @srcp2: the second input 172 * 173 * Return: >= nr_cpu_ids if no cpus set in both. See also cpumask_next_and(). 174 */ 175 static inline 176 unsigned int cpumask_first_and(const struct cpumask *srcp1, const struct cpumask *srcp2) 177 { 178 return find_first_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); 179 } 180 181 /** 182 * cpumask_first_and_and - return the first cpu from *srcp1 & *srcp2 & *srcp3 183 * @srcp1: the first input 184 * @srcp2: the second input 185 * @srcp3: the third input 186 * 187 * Return: >= nr_cpu_ids if no cpus set in all. 188 */ 189 static inline 190 unsigned int cpumask_first_and_and(const struct cpumask *srcp1, 191 const struct cpumask *srcp2, 192 const struct cpumask *srcp3) 193 { 194 return find_first_and_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), 195 cpumask_bits(srcp3), small_cpumask_bits); 196 } 197 198 /** 199 * cpumask_last - get the last CPU in a cpumask 200 * @srcp: - the cpumask pointer 201 * 202 * Return: >= nr_cpumask_bits if no CPUs set. 203 */ 204 static inline unsigned int cpumask_last(const struct cpumask *srcp) 205 { 206 return find_last_bit(cpumask_bits(srcp), small_cpumask_bits); 207 } 208 209 /** 210 * cpumask_next - get the next cpu in a cpumask 211 * @n: the cpu prior to the place to search (i.e. return will be > @n) 212 * @srcp: the cpumask pointer 213 * 214 * Return: >= nr_cpu_ids if no further cpus set. 215 */ 216 static inline 217 unsigned int cpumask_next(int n, const struct cpumask *srcp) 218 { 219 /* -1 is a legal arg here. */ 220 if (n != -1) 221 cpumask_check(n); 222 return find_next_bit(cpumask_bits(srcp), small_cpumask_bits, n + 1); 223 } 224 225 /** 226 * cpumask_next_zero - get the next unset cpu in a cpumask 227 * @n: the cpu prior to the place to search (i.e. return will be > @n) 228 * @srcp: the cpumask pointer 229 * 230 * Return: >= nr_cpu_ids if no further cpus unset. 231 */ 232 static inline unsigned int cpumask_next_zero(int n, const struct cpumask *srcp) 233 { 234 /* -1 is a legal arg here. */ 235 if (n != -1) 236 cpumask_check(n); 237 return find_next_zero_bit(cpumask_bits(srcp), small_cpumask_bits, n+1); 238 } 239 240 #if NR_CPUS == 1 241 /* Uniprocessor: there is only one valid CPU */ 242 static inline unsigned int cpumask_local_spread(unsigned int i, int node) 243 { 244 return 0; 245 } 246 247 static inline unsigned int cpumask_any_and_distribute(const struct cpumask *src1p, 248 const struct cpumask *src2p) 249 { 250 return cpumask_first_and(src1p, src2p); 251 } 252 253 static inline unsigned int cpumask_any_distribute(const struct cpumask *srcp) 254 { 255 return cpumask_first(srcp); 256 } 257 #else 258 unsigned int cpumask_local_spread(unsigned int i, int node); 259 unsigned int cpumask_any_and_distribute(const struct cpumask *src1p, 260 const struct cpumask *src2p); 261 unsigned int cpumask_any_distribute(const struct cpumask *srcp); 262 #endif /* NR_CPUS */ 263 264 /** 265 * cpumask_next_and - get the next cpu in *src1p & *src2p 266 * @n: the cpu prior to the place to search (i.e. return will be > @n) 267 * @src1p: the first cpumask pointer 268 * @src2p: the second cpumask pointer 269 * 270 * Return: >= nr_cpu_ids if no further cpus set in both. 271 */ 272 static inline 273 unsigned int cpumask_next_and(int n, const struct cpumask *src1p, 274 const struct cpumask *src2p) 275 { 276 /* -1 is a legal arg here. */ 277 if (n != -1) 278 cpumask_check(n); 279 return find_next_and_bit(cpumask_bits(src1p), cpumask_bits(src2p), 280 small_cpumask_bits, n + 1); 281 } 282 283 /** 284 * for_each_cpu - iterate over every cpu in a mask 285 * @cpu: the (optionally unsigned) integer iterator 286 * @mask: the cpumask pointer 287 * 288 * After the loop, cpu is >= nr_cpu_ids. 289 */ 290 #define for_each_cpu(cpu, mask) \ 291 for_each_set_bit(cpu, cpumask_bits(mask), small_cpumask_bits) 292 293 #if NR_CPUS == 1 294 static inline 295 unsigned int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap) 296 { 297 cpumask_check(start); 298 if (n != -1) 299 cpumask_check(n); 300 301 /* 302 * Return the first available CPU when wrapping, or when starting before cpu0, 303 * since there is only one valid option. 304 */ 305 if (wrap && n >= 0) 306 return nr_cpumask_bits; 307 308 return cpumask_first(mask); 309 } 310 #else 311 unsigned int __pure cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap); 312 #endif 313 314 /** 315 * for_each_cpu_wrap - iterate over every cpu in a mask, starting at a specified location 316 * @cpu: the (optionally unsigned) integer iterator 317 * @mask: the cpumask pointer 318 * @start: the start location 319 * 320 * The implementation does not assume any bit in @mask is set (including @start). 321 * 322 * After the loop, cpu is >= nr_cpu_ids. 323 */ 324 #define for_each_cpu_wrap(cpu, mask, start) \ 325 for_each_set_bit_wrap(cpu, cpumask_bits(mask), small_cpumask_bits, start) 326 327 /** 328 * for_each_cpu_and - iterate over every cpu in both masks 329 * @cpu: the (optionally unsigned) integer iterator 330 * @mask1: the first cpumask pointer 331 * @mask2: the second cpumask pointer 332 * 333 * This saves a temporary CPU mask in many places. It is equivalent to: 334 * struct cpumask tmp; 335 * cpumask_and(&tmp, &mask1, &mask2); 336 * for_each_cpu(cpu, &tmp) 337 * ... 338 * 339 * After the loop, cpu is >= nr_cpu_ids. 340 */ 341 #define for_each_cpu_and(cpu, mask1, mask2) \ 342 for_each_and_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits) 343 344 /** 345 * for_each_cpu_andnot - iterate over every cpu present in one mask, excluding 346 * those present in another. 347 * @cpu: the (optionally unsigned) integer iterator 348 * @mask1: the first cpumask pointer 349 * @mask2: the second cpumask pointer 350 * 351 * This saves a temporary CPU mask in many places. It is equivalent to: 352 * struct cpumask tmp; 353 * cpumask_andnot(&tmp, &mask1, &mask2); 354 * for_each_cpu(cpu, &tmp) 355 * ... 356 * 357 * After the loop, cpu is >= nr_cpu_ids. 358 */ 359 #define for_each_cpu_andnot(cpu, mask1, mask2) \ 360 for_each_andnot_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits) 361 362 /** 363 * for_each_cpu_or - iterate over every cpu present in either mask 364 * @cpu: the (optionally unsigned) integer iterator 365 * @mask1: the first cpumask pointer 366 * @mask2: the second cpumask pointer 367 * 368 * This saves a temporary CPU mask in many places. It is equivalent to: 369 * struct cpumask tmp; 370 * cpumask_or(&tmp, &mask1, &mask2); 371 * for_each_cpu(cpu, &tmp) 372 * ... 373 * 374 * After the loop, cpu is >= nr_cpu_ids. 375 */ 376 #define for_each_cpu_or(cpu, mask1, mask2) \ 377 for_each_or_bit(cpu, cpumask_bits(mask1), cpumask_bits(mask2), small_cpumask_bits) 378 379 /** 380 * for_each_cpu_from - iterate over CPUs present in @mask, from @cpu to the end of @mask. 381 * @cpu: the (optionally unsigned) integer iterator 382 * @mask: the cpumask pointer 383 * 384 * After the loop, cpu is >= nr_cpu_ids. 385 */ 386 #define for_each_cpu_from(cpu, mask) \ 387 for_each_set_bit_from(cpu, cpumask_bits(mask), small_cpumask_bits) 388 389 /** 390 * cpumask_any_but - return a "random" in a cpumask, but not this one. 391 * @mask: the cpumask to search 392 * @cpu: the cpu to ignore. 393 * 394 * Often used to find any cpu but smp_processor_id() in a mask. 395 * Return: >= nr_cpu_ids if no cpus set. 396 */ 397 static inline 398 unsigned int cpumask_any_but(const struct cpumask *mask, unsigned int cpu) 399 { 400 unsigned int i; 401 402 cpumask_check(cpu); 403 for_each_cpu(i, mask) 404 if (i != cpu) 405 break; 406 return i; 407 } 408 409 /** 410 * cpumask_any_and_but - pick a "random" cpu from *mask1 & *mask2, but not this one. 411 * @mask1: the first input cpumask 412 * @mask2: the second input cpumask 413 * @cpu: the cpu to ignore 414 * 415 * Returns >= nr_cpu_ids if no cpus set. 416 */ 417 static inline 418 unsigned int cpumask_any_and_but(const struct cpumask *mask1, 419 const struct cpumask *mask2, 420 unsigned int cpu) 421 { 422 unsigned int i; 423 424 cpumask_check(cpu); 425 i = cpumask_first_and(mask1, mask2); 426 if (i != cpu) 427 return i; 428 429 return cpumask_next_and(cpu, mask1, mask2); 430 } 431 432 /** 433 * cpumask_nth - get the Nth cpu in a cpumask 434 * @srcp: the cpumask pointer 435 * @cpu: the Nth cpu to find, starting from 0 436 * 437 * Return: >= nr_cpu_ids if such cpu doesn't exist. 438 */ 439 static inline unsigned int cpumask_nth(unsigned int cpu, const struct cpumask *srcp) 440 { 441 return find_nth_bit(cpumask_bits(srcp), small_cpumask_bits, cpumask_check(cpu)); 442 } 443 444 /** 445 * cpumask_nth_and - get the Nth cpu in 2 cpumasks 446 * @srcp1: the cpumask pointer 447 * @srcp2: the cpumask pointer 448 * @cpu: the Nth cpu to find, starting from 0 449 * 450 * Return: >= nr_cpu_ids if such cpu doesn't exist. 451 */ 452 static inline 453 unsigned int cpumask_nth_and(unsigned int cpu, const struct cpumask *srcp1, 454 const struct cpumask *srcp2) 455 { 456 return find_nth_and_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), 457 small_cpumask_bits, cpumask_check(cpu)); 458 } 459 460 /** 461 * cpumask_nth_andnot - get the Nth cpu set in 1st cpumask, and clear in 2nd. 462 * @srcp1: the cpumask pointer 463 * @srcp2: the cpumask pointer 464 * @cpu: the Nth cpu to find, starting from 0 465 * 466 * Return: >= nr_cpu_ids if such cpu doesn't exist. 467 */ 468 static inline 469 unsigned int cpumask_nth_andnot(unsigned int cpu, const struct cpumask *srcp1, 470 const struct cpumask *srcp2) 471 { 472 return find_nth_andnot_bit(cpumask_bits(srcp1), cpumask_bits(srcp2), 473 small_cpumask_bits, cpumask_check(cpu)); 474 } 475 476 /** 477 * cpumask_nth_and_andnot - get the Nth cpu set in 1st and 2nd cpumask, and clear in 3rd. 478 * @srcp1: the cpumask pointer 479 * @srcp2: the cpumask pointer 480 * @srcp3: the cpumask pointer 481 * @cpu: the Nth cpu to find, starting from 0 482 * 483 * Return: >= nr_cpu_ids if such cpu doesn't exist. 484 */ 485 static __always_inline 486 unsigned int cpumask_nth_and_andnot(unsigned int cpu, const struct cpumask *srcp1, 487 const struct cpumask *srcp2, 488 const struct cpumask *srcp3) 489 { 490 return find_nth_and_andnot_bit(cpumask_bits(srcp1), 491 cpumask_bits(srcp2), 492 cpumask_bits(srcp3), 493 small_cpumask_bits, cpumask_check(cpu)); 494 } 495 496 #define CPU_BITS_NONE \ 497 { \ 498 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 499 } 500 501 #define CPU_BITS_CPU0 \ 502 { \ 503 [0] = 1UL \ 504 } 505 506 /** 507 * cpumask_set_cpu - set a cpu in a cpumask 508 * @cpu: cpu number (< nr_cpu_ids) 509 * @dstp: the cpumask pointer 510 */ 511 static __always_inline void cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 512 { 513 set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 514 } 515 516 static __always_inline void __cpumask_set_cpu(unsigned int cpu, struct cpumask *dstp) 517 { 518 __set_bit(cpumask_check(cpu), cpumask_bits(dstp)); 519 } 520 521 522 /** 523 * cpumask_clear_cpu - clear a cpu in a cpumask 524 * @cpu: cpu number (< nr_cpu_ids) 525 * @dstp: the cpumask pointer 526 */ 527 static __always_inline void cpumask_clear_cpu(int cpu, struct cpumask *dstp) 528 { 529 clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 530 } 531 532 static __always_inline void __cpumask_clear_cpu(int cpu, struct cpumask *dstp) 533 { 534 __clear_bit(cpumask_check(cpu), cpumask_bits(dstp)); 535 } 536 537 /** 538 * cpumask_assign_cpu - assign a cpu in a cpumask 539 * @cpu: cpu number (< nr_cpu_ids) 540 * @dstp: the cpumask pointer 541 * @bool: the value to assign 542 */ 543 static __always_inline void cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) 544 { 545 assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); 546 } 547 548 static __always_inline void __cpumask_assign_cpu(int cpu, struct cpumask *dstp, bool value) 549 { 550 __assign_bit(cpumask_check(cpu), cpumask_bits(dstp), value); 551 } 552 553 /** 554 * cpumask_test_cpu - test for a cpu in a cpumask 555 * @cpu: cpu number (< nr_cpu_ids) 556 * @cpumask: the cpumask pointer 557 * 558 * Return: true if @cpu is set in @cpumask, else returns false 559 */ 560 static __always_inline bool cpumask_test_cpu(int cpu, const struct cpumask *cpumask) 561 { 562 return test_bit(cpumask_check(cpu), cpumask_bits((cpumask))); 563 } 564 565 /** 566 * cpumask_test_and_set_cpu - atomically test and set a cpu in a cpumask 567 * @cpu: cpu number (< nr_cpu_ids) 568 * @cpumask: the cpumask pointer 569 * 570 * test_and_set_bit wrapper for cpumasks. 571 * 572 * Return: true if @cpu is set in old bitmap of @cpumask, else returns false 573 */ 574 static __always_inline bool cpumask_test_and_set_cpu(int cpu, struct cpumask *cpumask) 575 { 576 return test_and_set_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 577 } 578 579 /** 580 * cpumask_test_and_clear_cpu - atomically test and clear a cpu in a cpumask 581 * @cpu: cpu number (< nr_cpu_ids) 582 * @cpumask: the cpumask pointer 583 * 584 * test_and_clear_bit wrapper for cpumasks. 585 * 586 * Return: true if @cpu is set in old bitmap of @cpumask, else returns false 587 */ 588 static __always_inline bool cpumask_test_and_clear_cpu(int cpu, struct cpumask *cpumask) 589 { 590 return test_and_clear_bit(cpumask_check(cpu), cpumask_bits(cpumask)); 591 } 592 593 /** 594 * cpumask_setall - set all cpus (< nr_cpu_ids) in a cpumask 595 * @dstp: the cpumask pointer 596 */ 597 static inline void cpumask_setall(struct cpumask *dstp) 598 { 599 if (small_const_nbits(small_cpumask_bits)) { 600 cpumask_bits(dstp)[0] = BITMAP_LAST_WORD_MASK(nr_cpumask_bits); 601 return; 602 } 603 bitmap_fill(cpumask_bits(dstp), nr_cpumask_bits); 604 } 605 606 /** 607 * cpumask_clear - clear all cpus (< nr_cpu_ids) in a cpumask 608 * @dstp: the cpumask pointer 609 */ 610 static inline void cpumask_clear(struct cpumask *dstp) 611 { 612 bitmap_zero(cpumask_bits(dstp), large_cpumask_bits); 613 } 614 615 /** 616 * cpumask_and - *dstp = *src1p & *src2p 617 * @dstp: the cpumask result 618 * @src1p: the first input 619 * @src2p: the second input 620 * 621 * Return: false if *@dstp is empty, else returns true 622 */ 623 static inline bool cpumask_and(struct cpumask *dstp, 624 const struct cpumask *src1p, 625 const struct cpumask *src2p) 626 { 627 return bitmap_and(cpumask_bits(dstp), cpumask_bits(src1p), 628 cpumask_bits(src2p), small_cpumask_bits); 629 } 630 631 /** 632 * cpumask_or - *dstp = *src1p | *src2p 633 * @dstp: the cpumask result 634 * @src1p: the first input 635 * @src2p: the second input 636 */ 637 static inline void cpumask_or(struct cpumask *dstp, const struct cpumask *src1p, 638 const struct cpumask *src2p) 639 { 640 bitmap_or(cpumask_bits(dstp), cpumask_bits(src1p), 641 cpumask_bits(src2p), small_cpumask_bits); 642 } 643 644 /** 645 * cpumask_xor - *dstp = *src1p ^ *src2p 646 * @dstp: the cpumask result 647 * @src1p: the first input 648 * @src2p: the second input 649 */ 650 static inline void cpumask_xor(struct cpumask *dstp, 651 const struct cpumask *src1p, 652 const struct cpumask *src2p) 653 { 654 bitmap_xor(cpumask_bits(dstp), cpumask_bits(src1p), 655 cpumask_bits(src2p), small_cpumask_bits); 656 } 657 658 /** 659 * cpumask_andnot - *dstp = *src1p & ~*src2p 660 * @dstp: the cpumask result 661 * @src1p: the first input 662 * @src2p: the second input 663 * 664 * Return: false if *@dstp is empty, else returns true 665 */ 666 static inline bool cpumask_andnot(struct cpumask *dstp, 667 const struct cpumask *src1p, 668 const struct cpumask *src2p) 669 { 670 return bitmap_andnot(cpumask_bits(dstp), cpumask_bits(src1p), 671 cpumask_bits(src2p), small_cpumask_bits); 672 } 673 674 /** 675 * cpumask_equal - *src1p == *src2p 676 * @src1p: the first input 677 * @src2p: the second input 678 * 679 * Return: true if the cpumasks are equal, false if not 680 */ 681 static inline bool cpumask_equal(const struct cpumask *src1p, 682 const struct cpumask *src2p) 683 { 684 return bitmap_equal(cpumask_bits(src1p), cpumask_bits(src2p), 685 small_cpumask_bits); 686 } 687 688 /** 689 * cpumask_or_equal - *src1p | *src2p == *src3p 690 * @src1p: the first input 691 * @src2p: the second input 692 * @src3p: the third input 693 * 694 * Return: true if first cpumask ORed with second cpumask == third cpumask, 695 * otherwise false 696 */ 697 static inline bool cpumask_or_equal(const struct cpumask *src1p, 698 const struct cpumask *src2p, 699 const struct cpumask *src3p) 700 { 701 return bitmap_or_equal(cpumask_bits(src1p), cpumask_bits(src2p), 702 cpumask_bits(src3p), small_cpumask_bits); 703 } 704 705 /** 706 * cpumask_intersects - (*src1p & *src2p) != 0 707 * @src1p: the first input 708 * @src2p: the second input 709 * 710 * Return: true if first cpumask ANDed with second cpumask is non-empty, 711 * otherwise false 712 */ 713 static inline bool cpumask_intersects(const struct cpumask *src1p, 714 const struct cpumask *src2p) 715 { 716 return bitmap_intersects(cpumask_bits(src1p), cpumask_bits(src2p), 717 small_cpumask_bits); 718 } 719 720 /** 721 * cpumask_subset - (*src1p & ~*src2p) == 0 722 * @src1p: the first input 723 * @src2p: the second input 724 * 725 * Return: true if *@src1p is a subset of *@src2p, else returns false 726 */ 727 static inline bool cpumask_subset(const struct cpumask *src1p, 728 const struct cpumask *src2p) 729 { 730 return bitmap_subset(cpumask_bits(src1p), cpumask_bits(src2p), 731 small_cpumask_bits); 732 } 733 734 /** 735 * cpumask_empty - *srcp == 0 736 * @srcp: the cpumask to that all cpus < nr_cpu_ids are clear. 737 * 738 * Return: true if srcp is empty (has no bits set), else false 739 */ 740 static inline bool cpumask_empty(const struct cpumask *srcp) 741 { 742 return bitmap_empty(cpumask_bits(srcp), small_cpumask_bits); 743 } 744 745 /** 746 * cpumask_full - *srcp == 0xFFFFFFFF... 747 * @srcp: the cpumask to that all cpus < nr_cpu_ids are set. 748 * 749 * Return: true if srcp is full (has all bits set), else false 750 */ 751 static inline bool cpumask_full(const struct cpumask *srcp) 752 { 753 return bitmap_full(cpumask_bits(srcp), nr_cpumask_bits); 754 } 755 756 /** 757 * cpumask_weight - Count of bits in *srcp 758 * @srcp: the cpumask to count bits (< nr_cpu_ids) in. 759 * 760 * Return: count of bits set in *srcp 761 */ 762 static inline unsigned int cpumask_weight(const struct cpumask *srcp) 763 { 764 return bitmap_weight(cpumask_bits(srcp), small_cpumask_bits); 765 } 766 767 /** 768 * cpumask_weight_and - Count of bits in (*srcp1 & *srcp2) 769 * @srcp1: the cpumask to count bits (< nr_cpu_ids) in. 770 * @srcp2: the cpumask to count bits (< nr_cpu_ids) in. 771 * 772 * Return: count of bits set in both *srcp1 and *srcp2 773 */ 774 static inline unsigned int cpumask_weight_and(const struct cpumask *srcp1, 775 const struct cpumask *srcp2) 776 { 777 return bitmap_weight_and(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); 778 } 779 780 /** 781 * cpumask_weight_andnot - Count of bits in (*srcp1 & ~*srcp2) 782 * @srcp1: the cpumask to count bits (< nr_cpu_ids) in. 783 * @srcp2: the cpumask to count bits (< nr_cpu_ids) in. 784 * 785 * Return: count of bits set in both *srcp1 and *srcp2 786 */ 787 static inline unsigned int cpumask_weight_andnot(const struct cpumask *srcp1, 788 const struct cpumask *srcp2) 789 { 790 return bitmap_weight_andnot(cpumask_bits(srcp1), cpumask_bits(srcp2), small_cpumask_bits); 791 } 792 793 /** 794 * cpumask_shift_right - *dstp = *srcp >> n 795 * @dstp: the cpumask result 796 * @srcp: the input to shift 797 * @n: the number of bits to shift by 798 */ 799 static inline void cpumask_shift_right(struct cpumask *dstp, 800 const struct cpumask *srcp, int n) 801 { 802 bitmap_shift_right(cpumask_bits(dstp), cpumask_bits(srcp), n, 803 small_cpumask_bits); 804 } 805 806 /** 807 * cpumask_shift_left - *dstp = *srcp << n 808 * @dstp: the cpumask result 809 * @srcp: the input to shift 810 * @n: the number of bits to shift by 811 */ 812 static inline void cpumask_shift_left(struct cpumask *dstp, 813 const struct cpumask *srcp, int n) 814 { 815 bitmap_shift_left(cpumask_bits(dstp), cpumask_bits(srcp), n, 816 nr_cpumask_bits); 817 } 818 819 /** 820 * cpumask_copy - *dstp = *srcp 821 * @dstp: the result 822 * @srcp: the input cpumask 823 */ 824 static inline void cpumask_copy(struct cpumask *dstp, 825 const struct cpumask *srcp) 826 { 827 bitmap_copy(cpumask_bits(dstp), cpumask_bits(srcp), large_cpumask_bits); 828 } 829 830 /** 831 * cpumask_any - pick a "random" cpu from *srcp 832 * @srcp: the input cpumask 833 * 834 * Return: >= nr_cpu_ids if no cpus set. 835 */ 836 #define cpumask_any(srcp) cpumask_first(srcp) 837 838 /** 839 * cpumask_any_and - pick a "random" cpu from *mask1 & *mask2 840 * @mask1: the first input cpumask 841 * @mask2: the second input cpumask 842 * 843 * Return: >= nr_cpu_ids if no cpus set. 844 */ 845 #define cpumask_any_and(mask1, mask2) cpumask_first_and((mask1), (mask2)) 846 847 /** 848 * cpumask_of - the cpumask containing just a given cpu 849 * @cpu: the cpu (<= nr_cpu_ids) 850 */ 851 #define cpumask_of(cpu) (get_cpu_mask(cpu)) 852 853 /** 854 * cpumask_parse_user - extract a cpumask from a user string 855 * @buf: the buffer to extract from 856 * @len: the length of the buffer 857 * @dstp: the cpumask to set. 858 * 859 * Return: -errno, or 0 for success. 860 */ 861 static inline int cpumask_parse_user(const char __user *buf, int len, 862 struct cpumask *dstp) 863 { 864 return bitmap_parse_user(buf, len, cpumask_bits(dstp), nr_cpumask_bits); 865 } 866 867 /** 868 * cpumask_parselist_user - extract a cpumask from a user string 869 * @buf: the buffer to extract from 870 * @len: the length of the buffer 871 * @dstp: the cpumask to set. 872 * 873 * Return: -errno, or 0 for success. 874 */ 875 static inline int cpumask_parselist_user(const char __user *buf, int len, 876 struct cpumask *dstp) 877 { 878 return bitmap_parselist_user(buf, len, cpumask_bits(dstp), 879 nr_cpumask_bits); 880 } 881 882 /** 883 * cpumask_parse - extract a cpumask from a string 884 * @buf: the buffer to extract from 885 * @dstp: the cpumask to set. 886 * 887 * Return: -errno, or 0 for success. 888 */ 889 static inline int cpumask_parse(const char *buf, struct cpumask *dstp) 890 { 891 return bitmap_parse(buf, UINT_MAX, cpumask_bits(dstp), nr_cpumask_bits); 892 } 893 894 /** 895 * cpulist_parse - extract a cpumask from a user string of ranges 896 * @buf: the buffer to extract from 897 * @dstp: the cpumask to set. 898 * 899 * Return: -errno, or 0 for success. 900 */ 901 static inline int cpulist_parse(const char *buf, struct cpumask *dstp) 902 { 903 return bitmap_parselist(buf, cpumask_bits(dstp), nr_cpumask_bits); 904 } 905 906 /** 907 * cpumask_size - calculate size to allocate for a 'struct cpumask' in bytes 908 * 909 * Return: size to allocate for a &struct cpumask in bytes 910 */ 911 static inline unsigned int cpumask_size(void) 912 { 913 return bitmap_size(large_cpumask_bits); 914 } 915 916 #ifdef CONFIG_CPUMASK_OFFSTACK 917 918 #define this_cpu_cpumask_var_ptr(x) this_cpu_read(x) 919 #define __cpumask_var_read_mostly __read_mostly 920 921 bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node); 922 923 static inline 924 bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, int node) 925 { 926 return alloc_cpumask_var_node(mask, flags | __GFP_ZERO, node); 927 } 928 929 /** 930 * alloc_cpumask_var - allocate a struct cpumask 931 * @mask: pointer to cpumask_var_t where the cpumask is returned 932 * @flags: GFP_ flags 933 * 934 * Only defined when CONFIG_CPUMASK_OFFSTACK=y, otherwise is 935 * a nop returning a constant 1 (in <linux/cpumask.h>). 936 * 937 * See alloc_cpumask_var_node. 938 * 939 * Return: %true if allocation succeeded, %false if not 940 */ 941 static inline 942 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 943 { 944 return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE); 945 } 946 947 static inline 948 bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 949 { 950 return alloc_cpumask_var(mask, flags | __GFP_ZERO); 951 } 952 953 void alloc_bootmem_cpumask_var(cpumask_var_t *mask); 954 void free_cpumask_var(cpumask_var_t mask); 955 void free_bootmem_cpumask_var(cpumask_var_t mask); 956 957 static inline bool cpumask_available(cpumask_var_t mask) 958 { 959 return mask != NULL; 960 } 961 962 #else 963 964 #define this_cpu_cpumask_var_ptr(x) this_cpu_ptr(x) 965 #define __cpumask_var_read_mostly 966 967 static inline bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 968 { 969 return true; 970 } 971 972 static inline bool alloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 973 int node) 974 { 975 return true; 976 } 977 978 static inline bool zalloc_cpumask_var(cpumask_var_t *mask, gfp_t flags) 979 { 980 cpumask_clear(*mask); 981 return true; 982 } 983 984 static inline bool zalloc_cpumask_var_node(cpumask_var_t *mask, gfp_t flags, 985 int node) 986 { 987 cpumask_clear(*mask); 988 return true; 989 } 990 991 static inline void alloc_bootmem_cpumask_var(cpumask_var_t *mask) 992 { 993 } 994 995 static inline void free_cpumask_var(cpumask_var_t mask) 996 { 997 } 998 999 static inline void free_bootmem_cpumask_var(cpumask_var_t mask) 1000 { 1001 } 1002 1003 static inline bool cpumask_available(cpumask_var_t mask) 1004 { 1005 return true; 1006 } 1007 #endif /* CONFIG_CPUMASK_OFFSTACK */ 1008 1009 DEFINE_FREE(free_cpumask_var, struct cpumask *, if (_T) free_cpumask_var(_T)); 1010 1011 /* It's common to want to use cpu_all_mask in struct member initializers, 1012 * so it has to refer to an address rather than a pointer. */ 1013 extern const DECLARE_BITMAP(cpu_all_bits, NR_CPUS); 1014 #define cpu_all_mask to_cpumask(cpu_all_bits) 1015 1016 /* First bits of cpu_bit_bitmap are in fact unset. */ 1017 #define cpu_none_mask to_cpumask(cpu_bit_bitmap[0]) 1018 1019 #if NR_CPUS == 1 1020 /* Uniprocessor: the possible/online/present masks are always "1" */ 1021 #define for_each_possible_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) 1022 #define for_each_online_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) 1023 #define for_each_present_cpu(cpu) for ((cpu) = 0; (cpu) < 1; (cpu)++) 1024 #else 1025 #define for_each_possible_cpu(cpu) for_each_cpu((cpu), cpu_possible_mask) 1026 #define for_each_online_cpu(cpu) for_each_cpu((cpu), cpu_online_mask) 1027 #define for_each_enabled_cpu(cpu) for_each_cpu((cpu), cpu_enabled_mask) 1028 #define for_each_present_cpu(cpu) for_each_cpu((cpu), cpu_present_mask) 1029 #endif 1030 1031 /* Wrappers for arch boot code to manipulate normally-constant masks */ 1032 void init_cpu_present(const struct cpumask *src); 1033 void init_cpu_possible(const struct cpumask *src); 1034 void init_cpu_online(const struct cpumask *src); 1035 1036 static inline void 1037 set_cpu_possible(unsigned int cpu, bool possible) 1038 { 1039 if (possible) 1040 cpumask_set_cpu(cpu, &__cpu_possible_mask); 1041 else 1042 cpumask_clear_cpu(cpu, &__cpu_possible_mask); 1043 } 1044 1045 static inline void 1046 set_cpu_enabled(unsigned int cpu, bool can_be_onlined) 1047 { 1048 if (can_be_onlined) 1049 cpumask_set_cpu(cpu, &__cpu_enabled_mask); 1050 else 1051 cpumask_clear_cpu(cpu, &__cpu_enabled_mask); 1052 } 1053 1054 static inline void 1055 set_cpu_present(unsigned int cpu, bool present) 1056 { 1057 if (present) 1058 cpumask_set_cpu(cpu, &__cpu_present_mask); 1059 else 1060 cpumask_clear_cpu(cpu, &__cpu_present_mask); 1061 } 1062 1063 void set_cpu_online(unsigned int cpu, bool online); 1064 1065 static inline void 1066 set_cpu_active(unsigned int cpu, bool active) 1067 { 1068 if (active) 1069 cpumask_set_cpu(cpu, &__cpu_active_mask); 1070 else 1071 cpumask_clear_cpu(cpu, &__cpu_active_mask); 1072 } 1073 1074 static inline void 1075 set_cpu_dying(unsigned int cpu, bool dying) 1076 { 1077 if (dying) 1078 cpumask_set_cpu(cpu, &__cpu_dying_mask); 1079 else 1080 cpumask_clear_cpu(cpu, &__cpu_dying_mask); 1081 } 1082 1083 /** 1084 * to_cpumask - convert a NR_CPUS bitmap to a struct cpumask * 1085 * @bitmap: the bitmap 1086 * 1087 * There are a few places where cpumask_var_t isn't appropriate and 1088 * static cpumasks must be used (eg. very early boot), yet we don't 1089 * expose the definition of 'struct cpumask'. 1090 * 1091 * This does the conversion, and can be used as a constant initializer. 1092 */ 1093 #define to_cpumask(bitmap) \ 1094 ((struct cpumask *)(1 ? (bitmap) \ 1095 : (void *)sizeof(__check_is_bitmap(bitmap)))) 1096 1097 static inline int __check_is_bitmap(const unsigned long *bitmap) 1098 { 1099 return 1; 1100 } 1101 1102 /* 1103 * Special-case data structure for "single bit set only" constant CPU masks. 1104 * 1105 * We pre-generate all the 64 (or 32) possible bit positions, with enough 1106 * padding to the left and the right, and return the constant pointer 1107 * appropriately offset. 1108 */ 1109 extern const unsigned long 1110 cpu_bit_bitmap[BITS_PER_LONG+1][BITS_TO_LONGS(NR_CPUS)]; 1111 1112 static inline const struct cpumask *get_cpu_mask(unsigned int cpu) 1113 { 1114 const unsigned long *p = cpu_bit_bitmap[1 + cpu % BITS_PER_LONG]; 1115 p -= cpu / BITS_PER_LONG; 1116 return to_cpumask(p); 1117 } 1118 1119 #if NR_CPUS > 1 1120 /** 1121 * num_online_cpus() - Read the number of online CPUs 1122 * 1123 * Despite the fact that __num_online_cpus is of type atomic_t, this 1124 * interface gives only a momentary snapshot and is not protected against 1125 * concurrent CPU hotplug operations unless invoked from a cpuhp_lock held 1126 * region. 1127 * 1128 * Return: momentary snapshot of the number of online CPUs 1129 */ 1130 static __always_inline unsigned int num_online_cpus(void) 1131 { 1132 return raw_atomic_read(&__num_online_cpus); 1133 } 1134 #define num_possible_cpus() cpumask_weight(cpu_possible_mask) 1135 #define num_enabled_cpus() cpumask_weight(cpu_enabled_mask) 1136 #define num_present_cpus() cpumask_weight(cpu_present_mask) 1137 #define num_active_cpus() cpumask_weight(cpu_active_mask) 1138 1139 static inline bool cpu_online(unsigned int cpu) 1140 { 1141 return cpumask_test_cpu(cpu, cpu_online_mask); 1142 } 1143 1144 static inline bool cpu_enabled(unsigned int cpu) 1145 { 1146 return cpumask_test_cpu(cpu, cpu_enabled_mask); 1147 } 1148 1149 static inline bool cpu_possible(unsigned int cpu) 1150 { 1151 return cpumask_test_cpu(cpu, cpu_possible_mask); 1152 } 1153 1154 static inline bool cpu_present(unsigned int cpu) 1155 { 1156 return cpumask_test_cpu(cpu, cpu_present_mask); 1157 } 1158 1159 static inline bool cpu_active(unsigned int cpu) 1160 { 1161 return cpumask_test_cpu(cpu, cpu_active_mask); 1162 } 1163 1164 static inline bool cpu_dying(unsigned int cpu) 1165 { 1166 return cpumask_test_cpu(cpu, cpu_dying_mask); 1167 } 1168 1169 #else 1170 1171 #define num_online_cpus() 1U 1172 #define num_possible_cpus() 1U 1173 #define num_enabled_cpus() 1U 1174 #define num_present_cpus() 1U 1175 #define num_active_cpus() 1U 1176 1177 static inline bool cpu_online(unsigned int cpu) 1178 { 1179 return cpu == 0; 1180 } 1181 1182 static inline bool cpu_possible(unsigned int cpu) 1183 { 1184 return cpu == 0; 1185 } 1186 1187 static inline bool cpu_enabled(unsigned int cpu) 1188 { 1189 return cpu == 0; 1190 } 1191 1192 static inline bool cpu_present(unsigned int cpu) 1193 { 1194 return cpu == 0; 1195 } 1196 1197 static inline bool cpu_active(unsigned int cpu) 1198 { 1199 return cpu == 0; 1200 } 1201 1202 static inline bool cpu_dying(unsigned int cpu) 1203 { 1204 return false; 1205 } 1206 1207 #endif /* NR_CPUS > 1 */ 1208 1209 #define cpu_is_offline(cpu) unlikely(!cpu_online(cpu)) 1210 1211 #if NR_CPUS <= BITS_PER_LONG 1212 #define CPU_BITS_ALL \ 1213 { \ 1214 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 1215 } 1216 1217 #else /* NR_CPUS > BITS_PER_LONG */ 1218 1219 #define CPU_BITS_ALL \ 1220 { \ 1221 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 1222 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 1223 } 1224 #endif /* NR_CPUS > BITS_PER_LONG */ 1225 1226 /** 1227 * cpumap_print_to_pagebuf - copies the cpumask into the buffer either 1228 * as comma-separated list of cpus or hex values of cpumask 1229 * @list: indicates whether the cpumap must be list 1230 * @mask: the cpumask to copy 1231 * @buf: the buffer to copy into 1232 * 1233 * Return: the length of the (null-terminated) @buf string, zero if 1234 * nothing is copied. 1235 */ 1236 static inline ssize_t 1237 cpumap_print_to_pagebuf(bool list, char *buf, const struct cpumask *mask) 1238 { 1239 return bitmap_print_to_pagebuf(list, buf, cpumask_bits(mask), 1240 nr_cpu_ids); 1241 } 1242 1243 /** 1244 * cpumap_print_bitmask_to_buf - copies the cpumask into the buffer as 1245 * hex values of cpumask 1246 * 1247 * @buf: the buffer to copy into 1248 * @mask: the cpumask to copy 1249 * @off: in the string from which we are copying, we copy to @buf 1250 * @count: the maximum number of bytes to print 1251 * 1252 * The function prints the cpumask into the buffer as hex values of 1253 * cpumask; Typically used by bin_attribute to export cpumask bitmask 1254 * ABI. 1255 * 1256 * Return: the length of how many bytes have been copied, excluding 1257 * terminating '\0'. 1258 */ 1259 static inline ssize_t 1260 cpumap_print_bitmask_to_buf(char *buf, const struct cpumask *mask, 1261 loff_t off, size_t count) 1262 { 1263 return bitmap_print_bitmask_to_buf(buf, cpumask_bits(mask), 1264 nr_cpu_ids, off, count) - 1; 1265 } 1266 1267 /** 1268 * cpumap_print_list_to_buf - copies the cpumask into the buffer as 1269 * comma-separated list of cpus 1270 * @buf: the buffer to copy into 1271 * @mask: the cpumask to copy 1272 * @off: in the string from which we are copying, we copy to @buf 1273 * @count: the maximum number of bytes to print 1274 * 1275 * Everything is same with the above cpumap_print_bitmask_to_buf() 1276 * except the print format. 1277 * 1278 * Return: the length of how many bytes have been copied, excluding 1279 * terminating '\0'. 1280 */ 1281 static inline ssize_t 1282 cpumap_print_list_to_buf(char *buf, const struct cpumask *mask, 1283 loff_t off, size_t count) 1284 { 1285 return bitmap_print_list_to_buf(buf, cpumask_bits(mask), 1286 nr_cpu_ids, off, count) - 1; 1287 } 1288 1289 #if NR_CPUS <= BITS_PER_LONG 1290 #define CPU_MASK_ALL \ 1291 (cpumask_t) { { \ 1292 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 1293 } } 1294 #else 1295 #define CPU_MASK_ALL \ 1296 (cpumask_t) { { \ 1297 [0 ... BITS_TO_LONGS(NR_CPUS)-2] = ~0UL, \ 1298 [BITS_TO_LONGS(NR_CPUS)-1] = BITMAP_LAST_WORD_MASK(NR_CPUS) \ 1299 } } 1300 #endif /* NR_CPUS > BITS_PER_LONG */ 1301 1302 #define CPU_MASK_NONE \ 1303 (cpumask_t) { { \ 1304 [0 ... BITS_TO_LONGS(NR_CPUS)-1] = 0UL \ 1305 } } 1306 1307 #define CPU_MASK_CPU0 \ 1308 (cpumask_t) { { \ 1309 [0] = 1UL \ 1310 } } 1311 1312 /* 1313 * Provide a valid theoretical max size for cpumap and cpulist sysfs files 1314 * to avoid breaking userspace which may allocate a buffer based on the size 1315 * reported by e.g. fstat. 1316 * 1317 * for cpumap NR_CPUS * 9/32 - 1 should be an exact length. 1318 * 1319 * For cpulist 7 is (ceil(log10(NR_CPUS)) + 1) allowing for NR_CPUS to be up 1320 * to 2 orders of magnitude larger than 8192. And then we divide by 2 to 1321 * cover a worst-case of every other cpu being on one of two nodes for a 1322 * very large NR_CPUS. 1323 * 1324 * Use PAGE_SIZE as a minimum for smaller configurations while avoiding 1325 * unsigned comparison to -1. 1326 */ 1327 #define CPUMAP_FILE_MAX_BYTES (((NR_CPUS * 9)/32 > PAGE_SIZE) \ 1328 ? (NR_CPUS * 9)/32 - 1 : PAGE_SIZE) 1329 #define CPULIST_FILE_MAX_BYTES (((NR_CPUS * 7)/2 > PAGE_SIZE) ? (NR_CPUS * 7)/2 : PAGE_SIZE) 1330 1331 #endif /* __LINUX_CPUMASK_H */ 1332