mm/bootmem.c

   1 /*
   2  *  bootmem - A boot-time physical memory allocator and configurator
   3  *
   4  *  Copyright (C) 1999 Ingo Molnar
   5  *                1999 Kanoj Sarcar, SGI
   6  *                2008 Johannes Weiner
   7  *
   8  * Access to this subsystem has to be serialized externally (which is true
   9  * for the boot process anyway).
  10  */
  11 #include <linux/init.h>
  12 #include <linux/pfn.h>
  13 #include <linux/slab.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/export.h>
  16 #include <linux/kmemleak.h>
  17 #include <linux/range.h>
  18 #include <linux/memblock.h>
  19
  20 #include <asm/bug.h>
  21 #include <asm/io.h>
  22 #include <asm/processor.h>
  23
  24 #include "internal.h"
  25
  26 #ifndef CONFIG_NEED_MULTIPLE_NODES
  27 struct pglist_data __refdata contig_page_data = {
  28         .bdata = &bootmem_node_data[0]
  29 };
  30 EXPORT_SYMBOL(contig_page_data);
  31 #endif
  32
  33 unsigned long max_low_pfn;
  34 unsigned long min_low_pfn;
  35 unsigned long max_pfn;
  36
  37 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  38
  39 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  40
  41 static int bootmem_debug;
  42
  43 static int __init bootmem_debug_setup(char *buf)
  44 {
  45         bootmem_debug = 1;
  46         return 0;
  47 }
  48 early_param("bootmem_debug", bootmem_debug_setup);
  49
  50 #define bdebug(fmt, args...) ({                         \
  51         if (unlikely(bootmem_debug))                    \
  52                 printk(KERN_INFO                        \
  53                         "bootmem::%s " fmt,             \
  54                         __func__, ## args);             \
  55 })
  56
  57 static unsigned long __init bootmap_bytes(unsigned long pages)
  58 {
  59         unsigned long bytes = DIV_ROUND_UP(pages, 8);
  60
  61         return ALIGN(bytes, sizeof(long));
  62 }
  63
  64 /**
  65  * bootmem_bootmap_pages - calculate bitmap size in pages
  66  * @pages: number of pages the bitmap has to represent
  67  */
  68 unsigned long __init bootmem_bootmap_pages(unsigned long pages)
  69 {
  70         unsigned long bytes = bootmap_bytes(pages);
  71
  72         return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
  73 }
  74
  75 /*
  76  * link bdata in order
  77  */
  78 static void __init link_bootmem(bootmem_data_t *bdata)
  79 {
  80         bootmem_data_t *ent;
  81
  82         list_for_each_entry(ent, &bdata_list, list) {
  83                 if (bdata->node_min_pfn < ent->node_min_pfn) {
  84                         list_add_tail(&bdata->list, &ent->list);
  85                         return;
  86                 }
  87         }
  88
  89         list_add_tail(&bdata->list, &bdata_list);
  90 }
  91
  92 /*
  93  * Called once to set up the allocator itself.
  94  */
  95 static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
  96         unsigned long mapstart, unsigned long start, unsigned long end)
  97 {
  98         unsigned long mapsize;
  99
 100         mminit_validate_memmodel_limits(&start, &end);
 101         bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
 102         bdata->node_min_pfn = start;
 103         bdata->node_low_pfn = end;
 104         link_bootmem(bdata);
 105
 106         /*
 107          * Initially all pages are reserved - setup_arch() has to
 108          * register free RAM areas explicitly.
 109          */
 110         mapsize = bootmap_bytes(end - start);
 111         memset(bdata->node_bootmem_map, 0xff, mapsize);
 112
 113         bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
 114                 bdata - bootmem_node_data, start, mapstart, end, mapsize);
 115
 116         return mapsize;
 117 }
 118
 119 /**
 120  * init_bootmem_node - register a node as boot memory
 121  * @pgdat: node to register
 122  * @freepfn: pfn where the bitmap for this node is to be placed
 123  * @startpfn: first pfn on the node
 124  * @endpfn: first pfn after the node
 125  *
 126  * Returns the number of bytes needed to hold the bitmap for this node.
 127  */
 128 unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
 129                                 unsigned long startpfn, unsigned long endpfn)
 130 {
 131         return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
 132 }
 133
 134 /**
 135  * init_bootmem - register boot memory
 136  * @start: pfn where the bitmap is to be placed
 137  * @pages: number of available physical pages
 138  *
 139  * Returns the number of bytes needed to hold the bitmap.
 140  */
 141 unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
 142 {
 143         max_low_pfn = pages;
 144         min_low_pfn = start;
 145         return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
 146 }
 147
 148 /*
 149  * free_bootmem_late - free bootmem pages directly to page allocator
 150  * @addr: starting address of the range
 151  * @size: size of the range in bytes
 152  *
 153  * This is only useful when the bootmem allocator has already been torn
 154  * down, but we are still initializing the system.  Pages are given directly
 155  * to the page allocator, no bootmem metadata is updated because it is gone.
 156  */
 157 void __init free_bootmem_late(unsigned long addr, unsigned long size)
 158 {
 159         unsigned long cursor, end;
 160
 161         kmemleak_free_part(__va(addr), size);
 162
 163         cursor = PFN_UP(addr);
 164         end = PFN_DOWN(addr + size);
 165
 166         for (; cursor < end; cursor++) {
 167                 __free_pages_bootmem(pfn_to_page(cursor), 0);
 168                 totalram_pages++;
 169         }
 170 }
 171
 172 static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 173 {
 174         struct page *page;
 175         unsigned long start, end, pages, count = 0;
 176
 177         if (!bdata->node_bootmem_map)
 178                 return 0;
 179
 180         start = bdata->node_min_pfn;
 181         end = bdata->node_low_pfn;
 182
 183         bdebug("nid=%td start=%lx end=%lx\n",
 184                 bdata - bootmem_node_data, start, end);
 185
 186         while (start < end) {
 187                 unsigned long *map, idx, vec;
 188
 189                 map = bdata->node_bootmem_map;
 190                 idx = start - bdata->node_min_pfn;
 191                 vec = ~map[idx / BITS_PER_LONG];
 192                 /*
 193                  * If we have a properly aligned and fully unreserved
 194                  * BITS_PER_LONG block of pages in front of us, free
 195                  * it in one go.
 196                  */
 197                 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
 198                         int order = ilog2(BITS_PER_LONG);
 199
 200                         __free_pages_bootmem(pfn_to_page(start), order);
 201                         count += BITS_PER_LONG;
 202                         start += BITS_PER_LONG;
 203                 } else {
 204                         unsigned long off = 0;
 205
 206                         vec >>= start & (BITS_PER_LONG - 1);
 207                         while (vec) {
 208                                 if (vec & 1) {
 209                                         page = pfn_to_page(start + off);
 210                                         __free_pages_bootmem(page, 0);
 211                                         count++;
 212                                 }
 213                                 vec >>= 1;
 214                                 off++;
 215                         }
 216                         start = ALIGN(start + 1, BITS_PER_LONG);
 217                 }
 218         }
 219
 220         page = virt_to_page(bdata->node_bootmem_map);
 221         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 222         pages = bootmem_bootmap_pages(pages);
 223         count += pages;
 224         while (pages--)
 225                 __free_pages_bootmem(page++, 0);
 226
 227         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 228
 229         return count;
 230 }
 231
 232 /**
 233  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 234  * @pgdat: node to be released
 235  *
 236  * Returns the number of pages actually released.
 237  */
 238 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 239 {
 240         register_page_bootmem_info_node(pgdat);
 241         return free_all_bootmem_core(pgdat->bdata);
 242 }
 243
 244 /**
 245  * free_all_bootmem - release free pages to the buddy allocator
 246  *
 247  * Returns the number of pages actually released.
 248  */
 249 unsigned long __init free_all_bootmem(void)
 250 {
 251         unsigned long total_pages = 0;
 252         bootmem_data_t *bdata;
 253
 254         list_for_each_entry(bdata, &bdata_list, list)
 255                 total_pages += free_all_bootmem_core(bdata);
 256
 257         return total_pages;
 258 }
 259
 260 static void __init __free(bootmem_data_t *bdata,
 261                         unsigned long sidx, unsigned long eidx)
 262 {
 263         unsigned long idx;
 264
 265         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 266                 sidx + bdata->node_min_pfn,
 267                 eidx + bdata->node_min_pfn);
 268
 269         if (bdata->hint_idx > sidx)
 270                 bdata->hint_idx = sidx;
 271
 272         for (idx = sidx; idx < eidx; idx++)
 273                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 274                         BUG();
 275 }
 276
 277 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 278                         unsigned long eidx, int flags)
 279 {
 280         unsigned long idx;
 281         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 282
 283         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 284                 bdata - bootmem_node_data,
 285                 sidx + bdata->node_min_pfn,
 286                 eidx + bdata->node_min_pfn,
 287                 flags);
 288
 289         for (idx = sidx; idx < eidx; idx++)
 290                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 291                         if (exclusive) {
 292                                 __free(bdata, sidx, idx);
 293                                 return -EBUSY;
 294                         }
 295                         bdebug("silent double reserve of PFN %lx\n",
 296                                 idx + bdata->node_min_pfn);
 297                 }
 298         return 0;
 299 }
 300
 301 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 302                                 unsigned long start, unsigned long end,
 303                                 int reserve, int flags)
 304 {
 305         unsigned long sidx, eidx;
 306
 307         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 308                 bdata - bootmem_node_data, start, end, reserve, flags);
 309
 310         BUG_ON(start < bdata->node_min_pfn);
 311         BUG_ON(end > bdata->node_low_pfn);
 312
 313         sidx = start - bdata->node_min_pfn;
 314         eidx = end - bdata->node_min_pfn;
 315
 316         if (reserve)
 317                 return __reserve(bdata, sidx, eidx, flags);
 318         else
 319                 __free(bdata, sidx, eidx);
 320         return 0;
 321 }
 322
 323 static int __init mark_bootmem(unsigned long start, unsigned long end,
 324                                 int reserve, int flags)
 325 {
 326         unsigned long pos;
 327         bootmem_data_t *bdata;
 328
 329         pos = start;
 330         list_for_each_entry(bdata, &bdata_list, list) {
 331                 int err;
 332                 unsigned long max;
 333
 334                 if (pos < bdata->node_min_pfn ||
 335                     pos >= bdata->node_low_pfn) {
 336                         BUG_ON(pos != start);
 337                         continue;
 338                 }
 339
 340                 max = min(bdata->node_low_pfn, end);
 341
 342                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 343                 if (reserve && err) {
 344                         mark_bootmem(start, pos, 0, 0);
 345                         return err;
 346                 }
 347
 348                 if (max == end)
 349                         return 0;
 350                 pos = bdata->node_low_pfn;
 351         }
 352         BUG();
 353 }
 354
 355 /**
 356  * free_bootmem_node - mark a page range as usable
 357  * @pgdat: node the range resides on
 358  * @physaddr: starting address of the range
 359  * @size: size of the range in bytes
 360  *
 361  * Partial pages will be considered reserved and left as they are.
 362  *
 363  * The range must reside completely on the specified node.
 364  */
 365 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 366                               unsigned long size)
 367 {
 368         unsigned long start, end;
 369
 370         kmemleak_free_part(__va(physaddr), size);
 371
 372         start = PFN_UP(physaddr);
 373         end = PFN_DOWN(physaddr + size);
 374
 375         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 376 }
 377
 378 /**
 379  * free_bootmem - mark a page range as usable
 380  * @addr: starting address of the range
 381  * @size: size of the range in bytes
 382  *
 383  * Partial pages will be considered reserved and left as they are.
 384  *
 385  * The range must be contiguous but may span node boundaries.
 386  */
 387 void __init free_bootmem(unsigned long addr, unsigned long size)
 388 {
 389         unsigned long start, end;
 390
 391         kmemleak_free_part(__va(addr), size);
 392
 393         start = PFN_UP(addr);
 394         end = PFN_DOWN(addr + size);
 395
 396         mark_bootmem(start, end, 0, 0);
 397 }
 398
 399 /**
 400  * reserve_bootmem_node - mark a page range as reserved
 401  * @pgdat: node the range resides on
 402  * @physaddr: starting address of the range
 403  * @size: size of the range in bytes
 404  * @flags: reservation flags (see linux/bootmem.h)
 405  *
 406  * Partial pages will be reserved.
 407  *
 408  * The range must reside completely on the specified node.
 409  */
 410 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 411                                  unsigned long size, int flags)
 412 {
 413         unsigned long start, end;
 414
 415         start = PFN_DOWN(physaddr);
 416         end = PFN_UP(physaddr + size);
 417
 418         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 419 }
 420
 421 /**
 422  * reserve_bootmem - mark a page range as usable
 423  * @addr: starting address of the range
 424  * @size: size of the range in bytes
 425  * @flags: reservation flags (see linux/bootmem.h)
 426  *
 427  * Partial pages will be reserved.
 428  *
 429  * The range must be contiguous but may span node boundaries.
 430  */
 431 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 432                             int flags)
 433 {
 434         unsigned long start, end;
 435
 436         start = PFN_DOWN(addr);
 437         end = PFN_UP(addr + size);
 438
 439         return mark_bootmem(start, end, 1, flags);
 440 }
 441
 442 int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
 443                                    int flags)
 444 {
 445         return reserve_bootmem(phys, len, flags);
 446 }
 447
 448 static unsigned long __init align_idx(struct bootmem_data *bdata,
 449                                       unsigned long idx, unsigned long step)
 450 {
 451         unsigned long base = bdata->node_min_pfn;
 452
 453         /*
 454          * Align the index with respect to the node start so that the
 455          * combination of both satisfies the requested alignment.
 456          */
 457
 458         return ALIGN(base + idx, step) - base;
 459 }
 460
 461 static unsigned long __init align_off(struct bootmem_data *bdata,
 462                                       unsigned long off, unsigned long align)
 463 {
 464         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 465
 466         /* Same as align_idx for byte offsets */
 467
 468         return ALIGN(base + off, align) - base;
 469 }
 470
 471 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 472                                         unsigned long size, unsigned long align,
 473                                         unsigned long goal, unsigned long limit)
 474 {
 475         unsigned long fallback = 0;
 476         unsigned long min, max, start, sidx, midx, step;
 477
 478         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 479                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 480                 align, goal, limit);
 481
 482         BUG_ON(!size);
 483         BUG_ON(align & (align - 1));
 484         BUG_ON(limit && goal + size > limit);
 485
 486         if (!bdata->node_bootmem_map)
 487                 return NULL;
 488
 489         min = bdata->node_min_pfn;
 490         max = bdata->node_low_pfn;
 491
 492         goal >>= PAGE_SHIFT;
 493         limit >>= PAGE_SHIFT;
 494
 495         if (limit && max > limit)
 496                 max = limit;
 497         if (max <= min)
 498                 return NULL;
 499
 500         step = max(align >> PAGE_SHIFT, 1UL);
 501
 502         if (goal && min < goal && goal < max)
 503                 start = ALIGN(goal, step);
 504         else
 505                 start = ALIGN(min, step);
 506
 507         sidx = start - bdata->node_min_pfn;
 508         midx = max - bdata->node_min_pfn;
 509
 510         if (bdata->hint_idx > sidx) {
 511                 /*
 512                  * Handle the valid case of sidx being zero and still
 513                  * catch the fallback below.
 514                  */
 515                 fallback = sidx + 1;
 516                 sidx = align_idx(bdata, bdata->hint_idx, step);
 517         }
 518
 519         while (1) {
 520                 int merge;
 521                 void *region;
 522                 unsigned long eidx, i, start_off, end_off;
 523 find_block:
 524                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 525                 sidx = align_idx(bdata, sidx, step);
 526                 eidx = sidx + PFN_UP(size);
 527
 528                 if (sidx >= midx || eidx > midx)
 529                         break;
 530
 531                 for (i = sidx; i < eidx; i++)
 532                         if (test_bit(i, bdata->node_bootmem_map)) {
 533                                 sidx = align_idx(bdata, i, step);
 534                                 if (sidx == i)
 535                                         sidx += step;
 536                                 goto find_block;
 537                         }
 538
 539                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 540                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 541                         start_off = align_off(bdata, bdata->last_end_off, align);
 542                 else
 543                         start_off = PFN_PHYS(sidx);
 544
 545                 merge = PFN_DOWN(start_off) < sidx;
 546                 end_off = start_off + size;
 547
 548                 bdata->last_end_off = end_off;
 549                 bdata->hint_idx = PFN_UP(end_off);
 550
 551                 /*
 552                  * Reserve the area now:
 553                  */
 554                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 555                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 556                         BUG();
 557
 558                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 559                                 start_off);
 560                 memset(region, 0, size);
 561                 /*
 562                  * The min_count is set to 0 so that bootmem allocated blocks
 563                  * are never reported as leaks.
 564                  */
 565                 kmemleak_alloc(region, size, 0, 0);
 566                 return region;
 567         }
 568
 569         if (fallback) {
 570                 sidx = align_idx(bdata, fallback - 1, step);
 571                 fallback = 0;
 572                 goto find_block;
 573         }
 574
 575         return NULL;
 576 }
 577
 578 static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
 579                                         unsigned long size, unsigned long align,
 580                                         unsigned long goal, unsigned long limit)
 581 {
 582         if (WARN_ON_ONCE(slab_is_available()))
 583                 return kzalloc(size, GFP_NOWAIT);
 584
 585 #ifdef CONFIG_HAVE_ARCH_BOOTMEM
 586         {
 587                 bootmem_data_t *p_bdata;
 588
 589                 p_bdata = bootmem_arch_preferred_node(bdata, size, align,
 590                                                         goal, limit);
 591                 if (p_bdata)
 592                         return alloc_bootmem_bdata(p_bdata, size, align,
 593                                                         goal, limit);
 594         }
 595 #endif
 596         return NULL;
 597 }
 598
 599 static void * __init alloc_bootmem_core(unsigned long size,
 600                                         unsigned long align,
 601                                         unsigned long goal,
 602                                         unsigned long limit)
 603 {
 604         bootmem_data_t *bdata;
 605         void *region;
 606
 607         region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit);
 608         if (region)
 609                 return region;
 610
 611         list_for_each_entry(bdata, &bdata_list, list) {
 612                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 613                         continue;
 614                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 615                         break;
 616
 617                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 618                 if (region)
 619                         return region;
 620         }
 621
 622         return NULL;
 623 }
 624
 625 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 626                                               unsigned long align,
 627                                               unsigned long goal,
 628                                               unsigned long limit)
 629 {
 630         void *ptr;
 631
 632 restart:
 633         ptr = alloc_bootmem_core(size, align, goal, limit);
 634         if (ptr)
 635                 return ptr;
 636         if (goal) {
 637                 goal = 0;
 638                 goto restart;
 639         }
 640
 641         return NULL;
 642 }
 643
 644 /**
 645  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 646  * @size: size of the request in bytes
 647  * @align: alignment of the region
 648  * @goal: preferred starting address of the region
 649  *
 650  * The goal is dropped if it can not be satisfied and the allocation will
 651  * fall back to memory below @goal.
 652  *
 653  * Allocation may happen on any node in the system.
 654  *
 655  * Returns NULL on failure.
 656  */
 657 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 658                                         unsigned long goal)
 659 {
 660         unsigned long limit = 0;
 661
 662         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 663 }
 664
 665 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 666                                         unsigned long goal, unsigned long limit)
 667 {
 668         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 669
 670         if (mem)
 671                 return mem;
 672         /*
 673          * Whoops, we cannot satisfy the allocation request.
 674          */
 675         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 676         panic("Out of memory");
 677         return NULL;
 678 }
 679
 680 /**
 681  * __alloc_bootmem - allocate boot memory
 682  * @size: size of the request in bytes
 683  * @align: alignment of the region
 684  * @goal: preferred starting address of the region
 685  *
 686  * The goal is dropped if it can not be satisfied and the allocation will
 687  * fall back to memory below @goal.
 688  *
 689  * Allocation may happen on any node in the system.
 690  *
 691  * The function panics if the request can not be satisfied.
 692  */
 693 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 694                               unsigned long goal)
 695 {
 696         unsigned long limit = 0;
 697
 698         return ___alloc_bootmem(size, align, goal, limit);
 699 }
 700
 701 static void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 702                                 unsigned long size, unsigned long align,
 703                                 unsigned long goal, unsigned long limit)
 704 {
 705         void *ptr;
 706
 707 again:
 708         ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size,
 709                                            align, goal, limit);
 710         if (ptr)
 711                 return ptr;
 712
 713         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 714         if (ptr)
 715                 return ptr;
 716
 717         ptr = alloc_bootmem_core(size, align, goal, limit);
 718         if (ptr)
 719                 return ptr;
 720
 721         if (goal) {
 722                 goal = 0;
 723                 goto again;
 724         }
 725
 726         return NULL;
 727 }
 728
 729 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 730                                    unsigned long align, unsigned long goal)
 731 {
 732         if (WARN_ON_ONCE(slab_is_available()))
 733                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 734
 735         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 736 }
 737
 738 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 739                                     unsigned long align, unsigned long goal,
 740                                     unsigned long limit)
 741 {
 742         void *ptr;
 743
 744         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 745         if (ptr)
 746                 return ptr;
 747
 748         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 749         panic("Out of memory");
 750         return NULL;
 751 }
 752
 753 /**
 754  * __alloc_bootmem_node - allocate boot memory from a specific node
 755  * @pgdat: node to allocate from
 756  * @size: size of the request in bytes
 757  * @align: alignment of the region
 758  * @goal: preferred starting address of the region
 759  *
 760  * The goal is dropped if it can not be satisfied and the allocation will
 761  * fall back to memory below @goal.
 762  *
 763  * Allocation may fall back to any node in the system if the specified node
 764  * can not hold the requested memory.
 765  *
 766  * The function panics if the request can not be satisfied.
 767  */
 768 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 769                                    unsigned long align, unsigned long goal)
 770 {
 771         if (WARN_ON_ONCE(slab_is_available()))
 772                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 773
 774         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 775 }
 776
 777 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 778                                    unsigned long align, unsigned long goal)
 779 {
 780 #ifdef MAX_DMA32_PFN
 781         unsigned long end_pfn;
 782
 783         if (WARN_ON_ONCE(slab_is_available()))
 784                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 785
 786         /* update goal according ...MAX_DMA32_PFN */
 787         end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 788
 789         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 790             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 791                 void *ptr;
 792                 unsigned long new_goal;
 793
 794                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 795                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 796                                                  new_goal, 0);
 797                 if (ptr)
 798                         return ptr;
 799         }
 800 #endif
 801
 802         return __alloc_bootmem_node(pgdat, size, align, goal);
 803
 804 }
 805
 806 #ifndef ARCH_LOW_ADDRESS_LIMIT
 807 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 808 #endif
 809
 810 /**
 811  * __alloc_bootmem_low - allocate low boot memory
 812  * @size: size of the request in bytes
 813  * @align: alignment of the region
 814  * @goal: preferred starting address of the region
 815  *
 816  * The goal is dropped if it can not be satisfied and the allocation will
 817  * fall back to memory below @goal.
 818  *
 819  * Allocation may happen on any node in the system.
 820  *
 821  * The function panics if the request can not be satisfied.
 822  */
 823 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 824                                   unsigned long goal)
 825 {
 826         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 827 }
 828
 829 /**
 830  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 831  * @pgdat: node to allocate from
 832  * @size: size of the request in bytes
 833  * @align: alignment of the region
 834  * @goal: preferred starting address of the region
 835  *
 836  * The goal is dropped if it can not be satisfied and the allocation will
 837  * fall back to memory below @goal.
 838  *
 839  * Allocation may fall back to any node in the system if the specified node
 840  * can not hold the requested memory.
 841  *
 842  * The function panics if the request can not be satisfied.
 843  */
 844 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 845                                        unsigned long align, unsigned long goal)
 846 {
 847         if (WARN_ON_ONCE(slab_is_available()))
 848                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 849
 850         return ___alloc_bootmem_node(pgdat, size, align,
 851                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 852 }