include/linux/memblock.h

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