root/include/linux/memblock.h

INCLUDED FROM

DEFINITIONS

1. memblock_discard
2. memblock_is_hotpluggable
3. memblock_is_mirror
4. memblock_is_nomap
5. memblock_set_region_node
6. memblock_get_region_node
7. memblock_set_region_node
8. memblock_get_region_node
9. memblock_phys_alloc
10. memblock_alloc
11. memblock_alloc_raw
12. memblock_alloc_from
13. memblock_alloc_low
14. memblock_alloc_node
15. memblock_free_early
16. memblock_free_early_nid
17. memblock_free_late
18. memblock_set_bottom_up
19. memblock_bottom_up
20. memblock_dump_all
21. memblock_region_memory_base_pfn
22. memblock_region_memory_end_pfn
23. memblock_region_reserved_base_pfn
24. memblock_region_reserved_end_pfn
25. early_memtest

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