include/linux/memblock.h

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