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