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                         fixup_zone_present_pages(page_to_nid(pfn_to_page(start)),
 202                                         start, start + BITS_PER_LONG);
 203                         count += BITS_PER_LONG;
 204                         start += BITS_PER_LONG;
 205                 } else {
 206                         unsigned long off = 0;
 207
 208                         vec >>= start & (BITS_PER_LONG - 1);
 209                         while (vec) {
 210                                 if (vec & 1) {
 211                                         page = pfn_to_page(start + off);
 212                                         __free_pages_bootmem(page, 0);
 213                                         fixup_zone_present_pages(
 214                                                 page_to_nid(page),
 215                                                 start + off, start + off + 1);
 216                                         count++;
 217                                 }
 218                                 vec >>= 1;
 219                                 off++;
 220                         }
 221                         start = ALIGN(start + 1, BITS_PER_LONG);
 222                 }
 223         }
 224
 225         page = virt_to_page(bdata->node_bootmem_map);
 226         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 227         pages = bootmem_bootmap_pages(pages);
 228         count += pages;
 229         while (pages--) {
 230                 fixup_zone_present_pages(page_to_nid(page),
 231                                 page_to_pfn(page), page_to_pfn(page) + 1);
 232                 __free_pages_bootmem(page++, 0);
 233         }
 234
 235         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 236
 237         return count;
 238 }
 239
 240 /**
 241  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 242  * @pgdat: node to be released
 243  *
 244  * Returns the number of pages actually released.
 245  */
 246 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 247 {
 248         register_page_bootmem_info_node(pgdat);
 249         return free_all_bootmem_core(pgdat->bdata);
 250 }
 251
 252 /**
 253  * free_all_bootmem - release free pages to the buddy allocator
 254  *
 255  * Returns the number of pages actually released.
 256  */
 257 unsigned long __init free_all_bootmem(void)
 258 {
 259         unsigned long total_pages = 0;
 260         bootmem_data_t *bdata;
 261
 262         list_for_each_entry(bdata, &bdata_list, list)
 263                 total_pages += free_all_bootmem_core(bdata);
 264
 265         return total_pages;
 266 }
 267
 268 static void __init __free(bootmem_data_t *bdata,
 269                         unsigned long sidx, unsigned long eidx)
 270 {
 271         unsigned long idx;
 272
 273         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 274                 sidx + bdata->node_min_pfn,
 275                 eidx + bdata->node_min_pfn);
 276
 277         if (bdata->hint_idx > sidx)
 278                 bdata->hint_idx = sidx;
 279
 280         for (idx = sidx; idx < eidx; idx++)
 281                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 282                         BUG();
 283 }
 284
 285 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 286                         unsigned long eidx, int flags)
 287 {
 288         unsigned long idx;
 289         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 290
 291         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 292                 bdata - bootmem_node_data,
 293                 sidx + bdata->node_min_pfn,
 294                 eidx + bdata->node_min_pfn,
 295                 flags);
 296
 297         for (idx = sidx; idx < eidx; idx++)
 298                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 299                         if (exclusive) {
 300                                 __free(bdata, sidx, idx);
 301                                 return -EBUSY;
 302                         }
 303                         bdebug("silent double reserve of PFN %lx\n",
 304                                 idx + bdata->node_min_pfn);
 305                 }
 306         return 0;
 307 }
 308
 309 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 310                                 unsigned long start, unsigned long end,
 311                                 int reserve, int flags)
 312 {
 313         unsigned long sidx, eidx;
 314
 315         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 316                 bdata - bootmem_node_data, start, end, reserve, flags);
 317
 318         BUG_ON(start < bdata->node_min_pfn);
 319         BUG_ON(end > bdata->node_low_pfn);
 320
 321         sidx = start - bdata->node_min_pfn;
 322         eidx = end - bdata->node_min_pfn;
 323
 324         if (reserve)
 325                 return __reserve(bdata, sidx, eidx, flags);
 326         else
 327                 __free(bdata, sidx, eidx);
 328         return 0;
 329 }
 330
 331 static int __init mark_bootmem(unsigned long start, unsigned long end,
 332                                 int reserve, int flags)
 333 {
 334         unsigned long pos;
 335         bootmem_data_t *bdata;
 336
 337         pos = start;
 338         list_for_each_entry(bdata, &bdata_list, list) {
 339                 int err;
 340                 unsigned long max;
 341
 342                 if (pos < bdata->node_min_pfn ||
 343                     pos >= bdata->node_low_pfn) {
 344                         BUG_ON(pos != start);
 345                         continue;
 346                 }
 347
 348                 max = min(bdata->node_low_pfn, end);
 349
 350                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 351                 if (reserve && err) {
 352                         mark_bootmem(start, pos, 0, 0);
 353                         return err;
 354                 }
 355
 356                 if (max == end)
 357                         return 0;
 358                 pos = bdata->node_low_pfn;
 359         }
 360         BUG();
 361 }
 362
 363 /**
 364  * free_bootmem_node - mark a page range as usable
 365  * @pgdat: node the range resides on
 366  * @physaddr: starting address of the range
 367  * @size: size of the range in bytes
 368  *
 369  * Partial pages will be considered reserved and left as they are.
 370  *
 371  * The range must reside completely on the specified node.
 372  */
 373 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 374                               unsigned long size)
 375 {
 376         unsigned long start, end;
 377
 378         kmemleak_free_part(__va(physaddr), size);
 379
 380         start = PFN_UP(physaddr);
 381         end = PFN_DOWN(physaddr + size);
 382
 383         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 384 }
 385
 386 /**
 387  * free_bootmem - mark a page range as usable
 388  * @addr: starting address of the range
 389  * @size: size of the range in bytes
 390  *
 391  * Partial pages will be considered reserved and left as they are.
 392  *
 393  * The range must be contiguous but may span node boundaries.
 394  */
 395 void __init free_bootmem(unsigned long addr, unsigned long size)
 396 {
 397         unsigned long start, end;
 398
 399         kmemleak_free_part(__va(addr), size);
 400
 401         start = PFN_UP(addr);
 402         end = PFN_DOWN(addr + size);
 403
 404         mark_bootmem(start, end, 0, 0);
 405 }
 406
 407 /**
 408  * reserve_bootmem_node - mark a page range as reserved
 409  * @pgdat: node the range resides on
 410  * @physaddr: starting address of the range
 411  * @size: size of the range in bytes
 412  * @flags: reservation flags (see linux/bootmem.h)
 413  *
 414  * Partial pages will be reserved.
 415  *
 416  * The range must reside completely on the specified node.
 417  */
 418 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 419                                  unsigned long size, int flags)
 420 {
 421         unsigned long start, end;
 422
 423         start = PFN_DOWN(physaddr);
 424         end = PFN_UP(physaddr + size);
 425
 426         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 427 }
 428
 429 /**
 430  * reserve_bootmem - mark a page range as reserved
 431  * @addr: starting address of the range
 432  * @size: size of the range in bytes
 433  * @flags: reservation flags (see linux/bootmem.h)
 434  *
 435  * Partial pages will be reserved.
 436  *
 437  * The range must be contiguous but may span node boundaries.
 438  */
 439 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 440                             int flags)
 441 {
 442         unsigned long start, end;
 443
 444         start = PFN_DOWN(addr);
 445         end = PFN_UP(addr + size);
 446
 447         return mark_bootmem(start, end, 1, flags);
 448 }
 449
 450 int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
 451                                    int flags)
 452 {
 453         return reserve_bootmem(phys, len, flags);
 454 }
 455
 456 static unsigned long __init align_idx(struct bootmem_data *bdata,
 457                                       unsigned long idx, unsigned long step)
 458 {
 459         unsigned long base = bdata->node_min_pfn;
 460
 461         /*
 462          * Align the index with respect to the node start so that the
 463          * combination of both satisfies the requested alignment.
 464          */
 465
 466         return ALIGN(base + idx, step) - base;
 467 }
 468
 469 static unsigned long __init align_off(struct bootmem_data *bdata,
 470                                       unsigned long off, unsigned long align)
 471 {
 472         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 473
 474         /* Same as align_idx for byte offsets */
 475
 476         return ALIGN(base + off, align) - base;
 477 }
 478
 479 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 480                                         unsigned long size, unsigned long align,
 481                                         unsigned long goal, unsigned long limit)
 482 {
 483         unsigned long fallback = 0;
 484         unsigned long min, max, start, sidx, midx, step;
 485
 486         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 487                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 488                 align, goal, limit);
 489
 490         BUG_ON(!size);
 491         BUG_ON(align & (align - 1));
 492         BUG_ON(limit && goal + size > limit);
 493
 494         if (!bdata->node_bootmem_map)
 495                 return NULL;
 496
 497         min = bdata->node_min_pfn;
 498         max = bdata->node_low_pfn;
 499
 500         goal >>= PAGE_SHIFT;
 501         limit >>= PAGE_SHIFT;
 502
 503         if (limit && max > limit)
 504                 max = limit;
 505         if (max <= min)
 506                 return NULL;
 507
 508         step = max(align >> PAGE_SHIFT, 1UL);
 509
 510         if (goal && min < goal && goal < max)
 511                 start = ALIGN(goal, step);
 512         else
 513                 start = ALIGN(min, step);
 514
 515         sidx = start - bdata->node_min_pfn;
 516         midx = max - bdata->node_min_pfn;
 517
 518         if (bdata->hint_idx > sidx) {
 519                 /*
 520                  * Handle the valid case of sidx being zero and still
 521                  * catch the fallback below.
 522                  */
 523                 fallback = sidx + 1;
 524                 sidx = align_idx(bdata, bdata->hint_idx, step);
 525         }
 526
 527         while (1) {
 528                 int merge;
 529                 void *region;
 530                 unsigned long eidx, i, start_off, end_off;
 531 find_block:
 532                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 533                 sidx = align_idx(bdata, sidx, step);
 534                 eidx = sidx + PFN_UP(size);
 535
 536                 if (sidx >= midx || eidx > midx)
 537                         break;
 538
 539                 for (i = sidx; i < eidx; i++)
 540                         if (test_bit(i, bdata->node_bootmem_map)) {
 541                                 sidx = align_idx(bdata, i, step);
 542                                 if (sidx == i)
 543                                         sidx += step;
 544                                 goto find_block;
 545                         }
 546
 547                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 548                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 549                         start_off = align_off(bdata, bdata->last_end_off, align);
 550                 else
 551                         start_off = PFN_PHYS(sidx);
 552
 553                 merge = PFN_DOWN(start_off) < sidx;
 554                 end_off = start_off + size;
 555
 556                 bdata->last_end_off = end_off;
 557                 bdata->hint_idx = PFN_UP(end_off);
 558
 559                 /*
 560                  * Reserve the area now:
 561                  */
 562                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 563                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 564                         BUG();
 565
 566                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 567                                 start_off);
 568                 memset(region, 0, size);
 569                 /*
 570                  * The min_count is set to 0 so that bootmem allocated blocks
 571                  * are never reported as leaks.
 572                  */
 573                 kmemleak_alloc(region, size, 0, 0);
 574                 return region;
 575         }
 576
 577         if (fallback) {
 578                 sidx = align_idx(bdata, fallback - 1, step);
 579                 fallback = 0;
 580                 goto find_block;
 581         }
 582
 583         return NULL;
 584 }
 585
 586 static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
 587                                         unsigned long size, unsigned long align,
 588                                         unsigned long goal, unsigned long limit)
 589 {
 590         if (WARN_ON_ONCE(slab_is_available()))
 591                 return kzalloc(size, GFP_NOWAIT);
 592
 593 #ifdef CONFIG_HAVE_ARCH_BOOTMEM
 594         {
 595                 bootmem_data_t *p_bdata;
 596
 597                 p_bdata = bootmem_arch_preferred_node(bdata, size, align,
 598                                                         goal, limit);
 599                 if (p_bdata)
 600                         return alloc_bootmem_bdata(p_bdata, size, align,
 601                                                         goal, limit);
 602         }
 603 #endif
 604         return NULL;
 605 }
 606
 607 static void * __init alloc_bootmem_core(unsigned long size,
 608                                         unsigned long align,
 609                                         unsigned long goal,
 610                                         unsigned long limit)
 611 {
 612         bootmem_data_t *bdata;
 613         void *region;
 614
 615         region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit);
 616         if (region)
 617                 return region;
 618
 619         list_for_each_entry(bdata, &bdata_list, list) {
 620                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 621                         continue;
 622                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 623                         break;
 624
 625                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 626                 if (region)
 627                         return region;
 628         }
 629
 630         return NULL;
 631 }
 632
 633 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 634                                               unsigned long align,
 635                                               unsigned long goal,
 636                                               unsigned long limit)
 637 {
 638         void *ptr;
 639
 640 restart:
 641         ptr = alloc_bootmem_core(size, align, goal, limit);
 642         if (ptr)
 643                 return ptr;
 644         if (goal) {
 645                 goal = 0;
 646                 goto restart;
 647         }
 648
 649         return NULL;
 650 }
 651
 652 /**
 653  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 654  * @size: size of the request in bytes
 655  * @align: alignment of the region
 656  * @goal: preferred starting address of the region
 657  *
 658  * The goal is dropped if it can not be satisfied and the allocation will
 659  * fall back to memory below @goal.
 660  *
 661  * Allocation may happen on any node in the system.
 662  *
 663  * Returns NULL on failure.
 664  */
 665 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 666                                         unsigned long goal)
 667 {
 668         unsigned long limit = 0;
 669
 670         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 671 }
 672
 673 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 674                                         unsigned long goal, unsigned long limit)
 675 {
 676         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 677
 678         if (mem)
 679                 return mem;
 680         /*
 681          * Whoops, we cannot satisfy the allocation request.
 682          */
 683         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 684         panic("Out of memory");
 685         return NULL;
 686 }
 687
 688 /**
 689  * __alloc_bootmem - allocate boot memory
 690  * @size: size of the request in bytes
 691  * @align: alignment of the region
 692  * @goal: preferred starting address of the region
 693  *
 694  * The goal is dropped if it can not be satisfied and the allocation will
 695  * fall back to memory below @goal.
 696  *
 697  * Allocation may happen on any node in the system.
 698  *
 699  * The function panics if the request can not be satisfied.
 700  */
 701 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 702                               unsigned long goal)
 703 {
 704         unsigned long limit = 0;
 705
 706         return ___alloc_bootmem(size, align, goal, limit);
 707 }
 708
 709 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 710                                 unsigned long size, unsigned long align,
 711                                 unsigned long goal, unsigned long limit)
 712 {
 713         void *ptr;
 714
 715 again:
 716         ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size,
 717                                            align, goal, limit);
 718         if (ptr)
 719                 return ptr;
 720
 721         /* do not panic in alloc_bootmem_bdata() */
 722         if (limit && goal + size > limit)
 723                 limit = 0;
 724
 725         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 726         if (ptr)
 727                 return ptr;
 728
 729         ptr = alloc_bootmem_core(size, align, goal, limit);
 730         if (ptr)
 731                 return ptr;
 732
 733         if (goal) {
 734                 goal = 0;
 735                 goto again;
 736         }
 737
 738         return NULL;
 739 }
 740
 741 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 742                                    unsigned long align, unsigned long goal)
 743 {
 744         if (WARN_ON_ONCE(slab_is_available()))
 745                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 746
 747         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 748 }
 749
 750 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 751                                     unsigned long align, unsigned long goal,
 752                                     unsigned long limit)
 753 {
 754         void *ptr;
 755
 756         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 757         if (ptr)
 758                 return ptr;
 759
 760         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 761         panic("Out of memory");
 762         return NULL;
 763 }
 764
 765 /**
 766  * __alloc_bootmem_node - allocate boot memory from a specific node
 767  * @pgdat: node to allocate from
 768  * @size: size of the request in bytes
 769  * @align: alignment of the region
 770  * @goal: preferred starting address of the region
 771  *
 772  * The goal is dropped if it can not be satisfied and the allocation will
 773  * fall back to memory below @goal.
 774  *
 775  * Allocation may fall back to any node in the system if the specified node
 776  * can not hold the requested memory.
 777  *
 778  * The function panics if the request can not be satisfied.
 779  */
 780 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 781                                    unsigned long align, unsigned long goal)
 782 {
 783         if (WARN_ON_ONCE(slab_is_available()))
 784                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 785
 786         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 787 }
 788
 789 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 790                                    unsigned long align, unsigned long goal)
 791 {
 792 #ifdef MAX_DMA32_PFN
 793         unsigned long end_pfn;
 794
 795         if (WARN_ON_ONCE(slab_is_available()))
 796                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 797
 798         /* update goal according ...MAX_DMA32_PFN */
 799         end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 800
 801         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 802             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 803                 void *ptr;
 804                 unsigned long new_goal;
 805
 806                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 807                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 808                                                  new_goal, 0);
 809                 if (ptr)
 810                         return ptr;
 811         }
 812 #endif
 813
 814         return __alloc_bootmem_node(pgdat, size, align, goal);
 815
 816 }
 817
 818 #ifndef ARCH_LOW_ADDRESS_LIMIT
 819 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 820 #endif
 821
 822 /**
 823  * __alloc_bootmem_low - allocate low boot memory
 824  * @size: size of the request in bytes
 825  * @align: alignment of the region
 826  * @goal: preferred starting address of the region
 827  *
 828  * The goal is dropped if it can not be satisfied and the allocation will
 829  * fall back to memory below @goal.
 830  *
 831  * Allocation may happen on any node in the system.
 832  *
 833  * The function panics if the request can not be satisfied.
 834  */
 835 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 836                                   unsigned long goal)
 837 {
 838         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 839 }
 840
 841 /**
 842  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 843  * @pgdat: node to allocate from
 844  * @size: size of the request in bytes
 845  * @align: alignment of the region
 846  * @goal: preferred starting address of the region
 847  *
 848  * The goal is dropped if it can not be satisfied and the allocation will
 849  * fall back to memory below @goal.
 850  *
 851  * Allocation may fall back to any node in the system if the specified node
 852  * can not hold the requested memory.
 853  *
 854  * The function panics if the request can not be satisfied.
 855  */
 856 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 857                                        unsigned long align, unsigned long goal)
 858 {
 859         if (WARN_ON_ONCE(slab_is_available()))
 860                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 861
 862         return ___alloc_bootmem_node(pgdat, size, align,
 863                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 864 }