1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 #ifndef _LINUX_MEMBLOCK_H 3 #define _LINUX_MEMBLOCK_H 4 #ifdef __KERNEL__ 5 6 /* 7 * Logical memory blocks. 8 * 9 * Copyright (C) 2001 Peter Bergner, IBM Corp. 10 */ 11 12 #include <linux/init.h> 13 #include <linux/mm.h> 14 #include <asm/dma.h> 15 16 extern unsigned long max_low_pfn; 17 extern unsigned long min_low_pfn; 18 19 /* 20 * highest page 21 */ 22 extern unsigned long max_pfn; 23 /* 24 * highest possible page 25 */ 26 extern unsigned long long max_possible_pfn; 27 28 /** 29 * enum memblock_flags - definition of memory region attributes 30 * @MEMBLOCK_NONE: no special request 31 * @MEMBLOCK_HOTPLUG: hotpluggable region 32 * @MEMBLOCK_MIRROR: mirrored region 33 * @MEMBLOCK_NOMAP: don't add to kernel direct mapping and treat as 34 * reserved in the memory map; refer to memblock_mark_nomap() description 35 * for further details 36 */ 37 enum memblock_flags { 38 MEMBLOCK_NONE = 0x0, /* No special request */ 39 MEMBLOCK_HOTPLUG = 0x1, /* hotpluggable region */ 40 MEMBLOCK_MIRROR = 0x2, /* mirrored region */ 41 MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ 42 }; 43 44 /** 45 * struct memblock_region - represents a memory region 46 * @base: base address of the region 47 * @size: size of the region 48 * @flags: memory region attributes 49 * @nid: NUMA node id 50 */ 51 struct memblock_region { 52 phys_addr_t base; 53 phys_addr_t size; 54 enum memblock_flags flags; 55 #ifdef CONFIG_NUMA 56 int nid; 57 #endif 58 }; 59 60 /** 61 * struct memblock_type - collection of memory regions of certain type 62 * @cnt: number of regions 63 * @max: size of the allocated array 64 * @total_size: size of all regions 65 * @regions: array of regions 66 * @name: the memory type symbolic name 67 */ 68 struct memblock_type { 69 unsigned long cnt; 70 unsigned long max; 71 phys_addr_t total_size; 72 struct memblock_region *regions; 73 char *name; 74 }; 75 76 /** 77 * struct memblock - memblock allocator metadata 78 * @bottom_up: is bottom up direction? 79 * @current_limit: physical address of the current allocation limit 80 * @memory: usable memory regions 81 * @reserved: reserved memory regions 82 */ 83 struct memblock { 84 bool bottom_up; /* is bottom up direction? */ 85 phys_addr_t current_limit; 86 struct memblock_type memory; 87 struct memblock_type reserved; 88 }; 89 90 extern struct memblock memblock; 91 92 #ifndef CONFIG_ARCH_KEEP_MEMBLOCK 93 #define __init_memblock __meminit 94 #define __initdata_memblock __meminitdata 95 void memblock_discard(void); 96 #else 97 #define __init_memblock 98 #define __initdata_memblock 99 static inline void memblock_discard(void) {} 100 #endif 101 102 void memblock_allow_resize(void); 103 int memblock_add_node(phys_addr_t base, phys_addr_t size, int nid); 104 int memblock_add(phys_addr_t base, phys_addr_t size); 105 int memblock_remove(phys_addr_t base, phys_addr_t size); 106 int memblock_free(phys_addr_t base, phys_addr_t size); 107 int memblock_reserve(phys_addr_t base, phys_addr_t size); 108 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 109 int memblock_physmem_add(phys_addr_t base, phys_addr_t size); 110 #endif 111 void memblock_trim_memory(phys_addr_t align); 112 bool memblock_overlaps_region(struct memblock_type *type, 113 phys_addr_t base, phys_addr_t size); 114 int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); 115 int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); 116 int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); 117 int memblock_mark_nomap(phys_addr_t base, phys_addr_t size); 118 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size); 119 120 void memblock_free_all(void); 121 void memblock_free_ptr(void *ptr, size_t size); 122 void reset_node_managed_pages(pg_data_t *pgdat); 123 void reset_all_zones_managed_pages(void); 124 125 /* Low level functions */ 126 void __next_mem_range(u64 *idx, int nid, enum memblock_flags flags, 127 struct memblock_type *type_a, 128 struct memblock_type *type_b, phys_addr_t *out_start, 129 phys_addr_t *out_end, int *out_nid); 130 131 void __next_mem_range_rev(u64 *idx, int nid, enum memblock_flags flags, 132 struct memblock_type *type_a, 133 struct memblock_type *type_b, phys_addr_t *out_start, 134 phys_addr_t *out_end, int *out_nid); 135 136 void __memblock_free_late(phys_addr_t base, phys_addr_t size); 137 138 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP 139 static inline void __next_physmem_range(u64 *idx, struct memblock_type *type, 140 phys_addr_t *out_start, 141 phys_addr_t *out_end) 142 { 143 extern struct memblock_type physmem; 144 145 __next_mem_range(idx, NUMA_NO_NODE, MEMBLOCK_NONE, &physmem, type, 146 out_start, out_end, NULL); 147 } 148 149 /** 150 * for_each_physmem_range - iterate through physmem areas not included in type. 151 * @i: u64 used as loop variable 152 * @type: ptr to memblock_type which excludes from the iteration, can be %NULL 153 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 154 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 155 */ 156 #define for_each_physmem_range(i, type, p_start, p_end) \ 157 for (i = 0, __next_physmem_range(&i, type, p_start, p_end); \ 158 i != (u64)ULLONG_MAX; \ 159 __next_physmem_range(&i, type, p_start, p_end)) 160 #endif /* CONFIG_HAVE_MEMBLOCK_PHYS_MAP */ 161 162 /** 163 * __for_each_mem_range - iterate through memblock areas from type_a and not 164 * included in type_b. Or just type_a if type_b is NULL. 165 * @i: u64 used as loop variable 166 * @type_a: ptr to memblock_type to iterate 167 * @type_b: ptr to memblock_type which excludes from the iteration 168 * @nid: node selector, %NUMA_NO_NODE for all nodes 169 * @flags: pick from blocks based on memory attributes 170 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 171 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 172 * @p_nid: ptr to int for nid of the range, can be %NULL 173 */ 174 #define __for_each_mem_range(i, type_a, type_b, nid, flags, \ 175 p_start, p_end, p_nid) \ 176 for (i = 0, __next_mem_range(&i, nid, flags, type_a, type_b, \ 177 p_start, p_end, p_nid); \ 178 i != (u64)ULLONG_MAX; \ 179 __next_mem_range(&i, nid, flags, type_a, type_b, \ 180 p_start, p_end, p_nid)) 181 182 /** 183 * __for_each_mem_range_rev - reverse iterate through memblock areas from 184 * type_a and not included in type_b. Or just type_a if type_b is NULL. 185 * @i: u64 used as loop variable 186 * @type_a: ptr to memblock_type to iterate 187 * @type_b: ptr to memblock_type which excludes from the iteration 188 * @nid: node selector, %NUMA_NO_NODE for all nodes 189 * @flags: pick from blocks based on memory attributes 190 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 191 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 192 * @p_nid: ptr to int for nid of the range, can be %NULL 193 */ 194 #define __for_each_mem_range_rev(i, type_a, type_b, nid, flags, \ 195 p_start, p_end, p_nid) \ 196 for (i = (u64)ULLONG_MAX, \ 197 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 198 p_start, p_end, p_nid); \ 199 i != (u64)ULLONG_MAX; \ 200 __next_mem_range_rev(&i, nid, flags, type_a, type_b, \ 201 p_start, p_end, p_nid)) 202 203 /** 204 * for_each_mem_range - iterate through memory areas. 205 * @i: u64 used as loop variable 206 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 207 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 208 */ 209 #define for_each_mem_range(i, p_start, p_end) \ 210 __for_each_mem_range(i, &memblock.memory, NULL, NUMA_NO_NODE, \ 211 MEMBLOCK_HOTPLUG, p_start, p_end, NULL) 212 213 /** 214 * for_each_mem_range_rev - reverse iterate through memblock areas from 215 * type_a and not included in type_b. Or just type_a if type_b is NULL. 216 * @i: u64 used as loop variable 217 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 218 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 219 */ 220 #define for_each_mem_range_rev(i, p_start, p_end) \ 221 __for_each_mem_range_rev(i, &memblock.memory, NULL, NUMA_NO_NODE, \ 222 MEMBLOCK_HOTPLUG, p_start, p_end, NULL) 223 224 /** 225 * for_each_reserved_mem_range - iterate over all reserved memblock areas 226 * @i: u64 used as loop variable 227 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 228 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 229 * 230 * Walks over reserved areas of memblock. Available as soon as memblock 231 * is initialized. 232 */ 233 #define for_each_reserved_mem_range(i, p_start, p_end) \ 234 __for_each_mem_range(i, &memblock.reserved, NULL, NUMA_NO_NODE, \ 235 MEMBLOCK_NONE, p_start, p_end, NULL) 236 237 static inline bool memblock_is_hotpluggable(struct memblock_region *m) 238 { 239 return m->flags & MEMBLOCK_HOTPLUG; 240 } 241 242 static inline bool memblock_is_mirror(struct memblock_region *m) 243 { 244 return m->flags & MEMBLOCK_MIRROR; 245 } 246 247 static inline bool memblock_is_nomap(struct memblock_region *m) 248 { 249 return m->flags & MEMBLOCK_NOMAP; 250 } 251 252 int memblock_search_pfn_nid(unsigned long pfn, unsigned long *start_pfn, 253 unsigned long *end_pfn); 254 void __next_mem_pfn_range(int *idx, int nid, unsigned long *out_start_pfn, 255 unsigned long *out_end_pfn, int *out_nid); 256 257 /** 258 * for_each_mem_pfn_range - early memory pfn range iterator 259 * @i: an integer used as loop variable 260 * @nid: node selector, %MAX_NUMNODES for all nodes 261 * @p_start: ptr to ulong for start pfn of the range, can be %NULL 262 * @p_end: ptr to ulong for end pfn of the range, can be %NULL 263 * @p_nid: ptr to int for nid of the range, can be %NULL 264 * 265 * Walks over configured memory ranges. 266 */ 267 #define for_each_mem_pfn_range(i, nid, p_start, p_end, p_nid) \ 268 for (i = -1, __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid); \ 269 i >= 0; __next_mem_pfn_range(&i, nid, p_start, p_end, p_nid)) 270 271 #ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT 272 void __next_mem_pfn_range_in_zone(u64 *idx, struct zone *zone, 273 unsigned long *out_spfn, 274 unsigned long *out_epfn); 275 /** 276 * for_each_free_mem_pfn_range_in_zone - iterate through zone specific free 277 * memblock areas 278 * @i: u64 used as loop variable 279 * @zone: zone in which all of the memory blocks reside 280 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 281 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 282 * 283 * Walks over free (memory && !reserved) areas of memblock in a specific 284 * zone. Available once memblock and an empty zone is initialized. The main 285 * assumption is that the zone start, end, and pgdat have been associated. 286 * This way we can use the zone to determine NUMA node, and if a given part 287 * of the memblock is valid for the zone. 288 */ 289 #define for_each_free_mem_pfn_range_in_zone(i, zone, p_start, p_end) \ 290 for (i = 0, \ 291 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end); \ 292 i != U64_MAX; \ 293 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) 294 295 /** 296 * for_each_free_mem_pfn_range_in_zone_from - iterate through zone specific 297 * free memblock areas from a given point 298 * @i: u64 used as loop variable 299 * @zone: zone in which all of the memory blocks reside 300 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 301 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 302 * 303 * Walks over free (memory && !reserved) areas of memblock in a specific 304 * zone, continuing from current position. Available as soon as memblock is 305 * initialized. 306 */ 307 #define for_each_free_mem_pfn_range_in_zone_from(i, zone, p_start, p_end) \ 308 for (; i != U64_MAX; \ 309 __next_mem_pfn_range_in_zone(&i, zone, p_start, p_end)) 310 311 int __init deferred_page_init_max_threads(const struct cpumask *node_cpumask); 312 313 #endif /* CONFIG_DEFERRED_STRUCT_PAGE_INIT */ 314 315 /** 316 * for_each_free_mem_range - iterate through free memblock areas 317 * @i: u64 used as loop variable 318 * @nid: node selector, %NUMA_NO_NODE for all nodes 319 * @flags: pick from blocks based on memory attributes 320 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 321 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 322 * @p_nid: ptr to int for nid of the range, can be %NULL 323 * 324 * Walks over free (memory && !reserved) areas of memblock. Available as 325 * soon as memblock is initialized. 326 */ 327 #define for_each_free_mem_range(i, nid, flags, p_start, p_end, p_nid) \ 328 __for_each_mem_range(i, &memblock.memory, &memblock.reserved, \ 329 nid, flags, p_start, p_end, p_nid) 330 331 /** 332 * for_each_free_mem_range_reverse - rev-iterate through free memblock areas 333 * @i: u64 used as loop variable 334 * @nid: node selector, %NUMA_NO_NODE for all nodes 335 * @flags: pick from blocks based on memory attributes 336 * @p_start: ptr to phys_addr_t for start address of the range, can be %NULL 337 * @p_end: ptr to phys_addr_t for end address of the range, can be %NULL 338 * @p_nid: ptr to int for nid of the range, can be %NULL 339 * 340 * Walks over free (memory && !reserved) areas of memblock in reverse 341 * order. Available as soon as memblock is initialized. 342 */ 343 #define for_each_free_mem_range_reverse(i, nid, flags, p_start, p_end, \ 344 p_nid) \ 345 __for_each_mem_range_rev(i, &memblock.memory, &memblock.reserved, \ 346 nid, flags, p_start, p_end, p_nid) 347 348 int memblock_set_node(phys_addr_t base, phys_addr_t size, 349 struct memblock_type *type, int nid); 350 351 #ifdef CONFIG_NUMA 352 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 353 { 354 r->nid = nid; 355 } 356 357 static inline int memblock_get_region_node(const struct memblock_region *r) 358 { 359 return r->nid; 360 } 361 #else 362 static inline void memblock_set_region_node(struct memblock_region *r, int nid) 363 { 364 } 365 366 static inline int memblock_get_region_node(const struct memblock_region *r) 367 { 368 return 0; 369 } 370 #endif /* CONFIG_NUMA */ 371 372 /* Flags for memblock allocation APIs */ 373 #define MEMBLOCK_ALLOC_ANYWHERE (~(phys_addr_t)0) 374 #define MEMBLOCK_ALLOC_ACCESSIBLE 0 375 #define MEMBLOCK_ALLOC_KASAN 1 376 377 /* We are using top down, so it is safe to use 0 here */ 378 #define MEMBLOCK_LOW_LIMIT 0 379 380 #ifndef ARCH_LOW_ADDRESS_LIMIT 381 #define ARCH_LOW_ADDRESS_LIMIT 0xffffffffUL 382 #endif 383 384 phys_addr_t memblock_phys_alloc_range(phys_addr_t size, phys_addr_t align, 385 phys_addr_t start, phys_addr_t end); 386 phys_addr_t memblock_alloc_range_nid(phys_addr_t size, 387 phys_addr_t align, phys_addr_t start, 388 phys_addr_t end, int nid, bool exact_nid); 389 phys_addr_t memblock_phys_alloc_try_nid(phys_addr_t size, phys_addr_t align, int nid); 390 391 static inline phys_addr_t memblock_phys_alloc(phys_addr_t size, 392 phys_addr_t align) 393 { 394 return memblock_phys_alloc_range(size, align, 0, 395 MEMBLOCK_ALLOC_ACCESSIBLE); 396 } 397 398 void *memblock_alloc_exact_nid_raw(phys_addr_t size, phys_addr_t align, 399 phys_addr_t min_addr, phys_addr_t max_addr, 400 int nid); 401 void *memblock_alloc_try_nid_raw(phys_addr_t size, phys_addr_t align, 402 phys_addr_t min_addr, phys_addr_t max_addr, 403 int nid); 404 void *memblock_alloc_try_nid(phys_addr_t size, phys_addr_t align, 405 phys_addr_t min_addr, phys_addr_t max_addr, 406 int nid); 407 408 static __always_inline void *memblock_alloc(phys_addr_t size, phys_addr_t align) 409 { 410 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 411 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 412 } 413 414 static inline void *memblock_alloc_raw(phys_addr_t size, 415 phys_addr_t align) 416 { 417 return memblock_alloc_try_nid_raw(size, align, MEMBLOCK_LOW_LIMIT, 418 MEMBLOCK_ALLOC_ACCESSIBLE, 419 NUMA_NO_NODE); 420 } 421 422 static inline void *memblock_alloc_from(phys_addr_t size, 423 phys_addr_t align, 424 phys_addr_t min_addr) 425 { 426 return memblock_alloc_try_nid(size, align, min_addr, 427 MEMBLOCK_ALLOC_ACCESSIBLE, NUMA_NO_NODE); 428 } 429 430 static inline void *memblock_alloc_low(phys_addr_t size, 431 phys_addr_t align) 432 { 433 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 434 ARCH_LOW_ADDRESS_LIMIT, NUMA_NO_NODE); 435 } 436 437 static inline void *memblock_alloc_node(phys_addr_t size, 438 phys_addr_t align, int nid) 439 { 440 return memblock_alloc_try_nid(size, align, MEMBLOCK_LOW_LIMIT, 441 MEMBLOCK_ALLOC_ACCESSIBLE, nid); 442 } 443 444 static inline void memblock_free_early(phys_addr_t base, 445 phys_addr_t size) 446 { 447 memblock_free(base, size); 448 } 449 450 static inline void memblock_free_early_nid(phys_addr_t base, 451 phys_addr_t size, int nid) 452 { 453 memblock_free(base, size); 454 } 455 456 static inline void memblock_free_late(phys_addr_t base, phys_addr_t size) 457 { 458 __memblock_free_late(base, size); 459 } 460 461 /* 462 * Set the allocation direction to bottom-up or top-down. 463 */ 464 static inline __init_memblock void memblock_set_bottom_up(bool enable) 465 { 466 memblock.bottom_up = enable; 467 } 468 469 /* 470 * Check if the allocation direction is bottom-up or not. 471 * if this is true, that said, memblock will allocate memory 472 * in bottom-up direction. 473 */ 474 static inline __init_memblock bool memblock_bottom_up(void) 475 { 476 return memblock.bottom_up; 477 } 478 479 phys_addr_t memblock_phys_mem_size(void); 480 phys_addr_t memblock_reserved_size(void); 481 phys_addr_t memblock_start_of_DRAM(void); 482 phys_addr_t memblock_end_of_DRAM(void); 483 void memblock_enforce_memory_limit(phys_addr_t memory_limit); 484 void memblock_cap_memory_range(phys_addr_t base, phys_addr_t size); 485 void memblock_mem_limit_remove_map(phys_addr_t limit); 486 bool memblock_is_memory(phys_addr_t addr); 487 bool memblock_is_map_memory(phys_addr_t addr); 488 bool memblock_is_region_memory(phys_addr_t base, phys_addr_t size); 489 bool memblock_is_reserved(phys_addr_t addr); 490 bool memblock_is_region_reserved(phys_addr_t base, phys_addr_t size); 491 492 void memblock_dump_all(void); 493 494 /** 495 * memblock_set_current_limit - Set the current allocation limit to allow 496 * limiting allocations to what is currently 497 * accessible during boot 498 * @limit: New limit value (physical address) 499 */ 500 void memblock_set_current_limit(phys_addr_t limit); 501 502 503 phys_addr_t memblock_get_current_limit(void); 504 505 /* 506 * pfn conversion functions 507 * 508 * While the memory MEMBLOCKs should always be page aligned, the reserved 509 * MEMBLOCKs may not be. This accessor attempt to provide a very clear 510 * idea of what they return for such non aligned MEMBLOCKs. 511 */ 512 513 /** 514 * memblock_region_memory_base_pfn - get the lowest pfn of the memory region 515 * @reg: memblock_region structure 516 * 517 * Return: the lowest pfn intersecting with the memory region 518 */ 519 static inline unsigned long memblock_region_memory_base_pfn(const struct memblock_region *reg) 520 { 521 return PFN_UP(reg->base); 522 } 523 524 /** 525 * memblock_region_memory_end_pfn - get the end pfn of the memory region 526 * @reg: memblock_region structure 527 * 528 * Return: the end_pfn of the reserved region 529 */ 530 static inline unsigned long memblock_region_memory_end_pfn(const struct memblock_region *reg) 531 { 532 return PFN_DOWN(reg->base + reg->size); 533 } 534 535 /** 536 * memblock_region_reserved_base_pfn - get the lowest pfn of the reserved region 537 * @reg: memblock_region structure 538 * 539 * Return: the lowest pfn intersecting with the reserved region 540 */ 541 static inline unsigned long memblock_region_reserved_base_pfn(const struct memblock_region *reg) 542 { 543 return PFN_DOWN(reg->base); 544 } 545 546 /** 547 * memblock_region_reserved_end_pfn - get the end pfn of the reserved region 548 * @reg: memblock_region structure 549 * 550 * Return: the end_pfn of the reserved region 551 */ 552 static inline unsigned long memblock_region_reserved_end_pfn(const struct memblock_region *reg) 553 { 554 return PFN_UP(reg->base + reg->size); 555 } 556 557 /** 558 * for_each_mem_region - itereate over memory regions 559 * @region: loop variable 560 */ 561 #define for_each_mem_region(region) \ 562 for (region = memblock.memory.regions; \ 563 region < (memblock.memory.regions + memblock.memory.cnt); \ 564 region++) 565 566 /** 567 * for_each_reserved_mem_region - itereate over reserved memory regions 568 * @region: loop variable 569 */ 570 #define for_each_reserved_mem_region(region) \ 571 for (region = memblock.reserved.regions; \ 572 region < (memblock.reserved.regions + memblock.reserved.cnt); \ 573 region++) 574 575 extern void *alloc_large_system_hash(const char *tablename, 576 unsigned long bucketsize, 577 unsigned long numentries, 578 int scale, 579 int flags, 580 unsigned int *_hash_shift, 581 unsigned int *_hash_mask, 582 unsigned long low_limit, 583 unsigned long high_limit); 584 585 #define HASH_EARLY 0x00000001 /* Allocating during early boot? */ 586 #define HASH_SMALL 0x00000002 /* sub-page allocation allowed, min 587 * shift passed via *_hash_shift */ 588 #define HASH_ZERO 0x00000004 /* Zero allocated hash table */ 589 590 /* Only NUMA needs hash distribution. 64bit NUMA architectures have 591 * sufficient vmalloc space. 592 */ 593 #ifdef CONFIG_NUMA 594 #define HASHDIST_DEFAULT IS_ENABLED(CONFIG_64BIT) 595 extern int hashdist; /* Distribute hashes across NUMA nodes? */ 596 #else 597 #define hashdist (0) 598 #endif 599 600 #ifdef CONFIG_MEMTEST 601 extern void early_memtest(phys_addr_t start, phys_addr_t end); 602 #else 603 static inline void early_memtest(phys_addr_t start, phys_addr_t end) 604 { 605 } 606 #endif 607 608 #endif /* __KERNEL__ */ 609 610 #endif /* _LINUX_MEMBLOCK_H */ 611