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 physical 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 physaddr, unsigned long size)
 158 {
 159         unsigned long cursor, end;
 160
 161         kmemleak_free_part(__va(physaddr), size);
 162
 163         cursor = PFN_UP(physaddr);
 164         end = PFN_DOWN(physaddr + 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 static void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
 233 {
 234         struct zone *z;
 235
 236         /*
 237          * In free_area_init_core(), highmem zone's managed_pages is set to
 238          * present_pages, and bootmem allocator doesn't allocate from highmem
 239          * zones. So there's no need to recalculate managed_pages because all
 240          * highmem pages will be managed by the buddy system. Here highmem
 241          * zone also includes highmem movable zone.
 242          */
 243         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 244                 if (!is_highmem(z))
 245                         z->managed_pages = 0;
 246 }
 247
 248 /**
 249  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 250  * @pgdat: node to be released
 251  *
 252  * Returns the number of pages actually released.
 253  */
 254 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 255 {
 256         register_page_bootmem_info_node(pgdat);
 257         reset_node_lowmem_managed_pages(pgdat);
 258         return free_all_bootmem_core(pgdat->bdata);
 259 }
 260
 261 /**
 262  * free_all_bootmem - release free pages to the buddy allocator
 263  *
 264  * Returns the number of pages actually released.
 265  */
 266 unsigned long __init free_all_bootmem(void)
 267 {
 268         unsigned long total_pages = 0;
 269         bootmem_data_t *bdata;
 270         struct pglist_data *pgdat;
 271
 272         for_each_online_pgdat(pgdat)
 273                 reset_node_lowmem_managed_pages(pgdat);
 274
 275         list_for_each_entry(bdata, &bdata_list, list)
 276                 total_pages += free_all_bootmem_core(bdata);
 277
 278         return total_pages;
 279 }
 280
 281 static void __init __free(bootmem_data_t *bdata,
 282                         unsigned long sidx, unsigned long eidx)
 283 {
 284         unsigned long idx;
 285
 286         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 287                 sidx + bdata->node_min_pfn,
 288                 eidx + bdata->node_min_pfn);
 289
 290         if (bdata->hint_idx > sidx)
 291                 bdata->hint_idx = sidx;
 292
 293         for (idx = sidx; idx < eidx; idx++)
 294                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 295                         BUG();
 296 }
 297
 298 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 299                         unsigned long eidx, int flags)
 300 {
 301         unsigned long idx;
 302         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 303
 304         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 305                 bdata - bootmem_node_data,
 306                 sidx + bdata->node_min_pfn,
 307                 eidx + bdata->node_min_pfn,
 308                 flags);
 309
 310         for (idx = sidx; idx < eidx; idx++)
 311                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 312                         if (exclusive) {
 313                                 __free(bdata, sidx, idx);
 314                                 return -EBUSY;
 315                         }
 316                         bdebug("silent double reserve of PFN %lx\n",
 317                                 idx + bdata->node_min_pfn);
 318                 }
 319         return 0;
 320 }
 321
 322 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 323                                 unsigned long start, unsigned long end,
 324                                 int reserve, int flags)
 325 {
 326         unsigned long sidx, eidx;
 327
 328         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 329                 bdata - bootmem_node_data, start, end, reserve, flags);
 330
 331         BUG_ON(start < bdata->node_min_pfn);
 332         BUG_ON(end > bdata->node_low_pfn);
 333
 334         sidx = start - bdata->node_min_pfn;
 335         eidx = end - bdata->node_min_pfn;
 336
 337         if (reserve)
 338                 return __reserve(bdata, sidx, eidx, flags);
 339         else
 340                 __free(bdata, sidx, eidx);
 341         return 0;
 342 }
 343
 344 static int __init mark_bootmem(unsigned long start, unsigned long end,
 345                                 int reserve, int flags)
 346 {
 347         unsigned long pos;
 348         bootmem_data_t *bdata;
 349
 350         pos = start;
 351         list_for_each_entry(bdata, &bdata_list, list) {
 352                 int err;
 353                 unsigned long max;
 354
 355                 if (pos < bdata->node_min_pfn ||
 356                     pos >= bdata->node_low_pfn) {
 357                         BUG_ON(pos != start);
 358                         continue;
 359                 }
 360
 361                 max = min(bdata->node_low_pfn, end);
 362
 363                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 364                 if (reserve && err) {
 365                         mark_bootmem(start, pos, 0, 0);
 366                         return err;
 367                 }
 368
 369                 if (max == end)
 370                         return 0;
 371                 pos = bdata->node_low_pfn;
 372         }
 373         BUG();
 374 }
 375
 376 /**
 377  * free_bootmem_node - mark a page range as usable
 378  * @pgdat: node the range resides on
 379  * @physaddr: starting address of the range
 380  * @size: size of the range in bytes
 381  *
 382  * Partial pages will be considered reserved and left as they are.
 383  *
 384  * The range must reside completely on the specified node.
 385  */
 386 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 387                               unsigned long size)
 388 {
 389         unsigned long start, end;
 390
 391         kmemleak_free_part(__va(physaddr), size);
 392
 393         start = PFN_UP(physaddr);
 394         end = PFN_DOWN(physaddr + size);
 395
 396         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 397 }
 398
 399 /**
 400  * free_bootmem - mark a page range as usable
 401  * @addr: starting physical address of the range
 402  * @size: size of the range in bytes
 403  *
 404  * Partial pages will be considered reserved and left as they are.
 405  *
 406  * The range must be contiguous but may span node boundaries.
 407  */
 408 void __init free_bootmem(unsigned long physaddr, unsigned long size)
 409 {
 410         unsigned long start, end;
 411
 412         kmemleak_free_part(__va(physaddr), size);
 413
 414         start = PFN_UP(physaddr);
 415         end = PFN_DOWN(physaddr + size);
 416
 417         mark_bootmem(start, end, 0, 0);
 418 }
 419
 420 /**
 421  * reserve_bootmem_node - mark a page range as reserved
 422  * @pgdat: node the range resides on
 423  * @physaddr: 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 reside completely on the specified node.
 430  */
 431 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 432                                  unsigned long size, int flags)
 433 {
 434         unsigned long start, end;
 435
 436         start = PFN_DOWN(physaddr);
 437         end = PFN_UP(physaddr + size);
 438
 439         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 440 }
 441
 442 /**
 443  * reserve_bootmem - mark a page range as reserved
 444  * @addr: starting address of the range
 445  * @size: size of the range in bytes
 446  * @flags: reservation flags (see linux/bootmem.h)
 447  *
 448  * Partial pages will be reserved.
 449  *
 450  * The range must be contiguous but may span node boundaries.
 451  */
 452 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 453                             int flags)
 454 {
 455         unsigned long start, end;
 456
 457         start = PFN_DOWN(addr);
 458         end = PFN_UP(addr + size);
 459
 460         return mark_bootmem(start, end, 1, flags);
 461 }
 462
 463 static unsigned long __init align_idx(struct bootmem_data *bdata,
 464                                       unsigned long idx, unsigned long step)
 465 {
 466         unsigned long base = bdata->node_min_pfn;
 467
 468         /*
 469          * Align the index with respect to the node start so that the
 470          * combination of both satisfies the requested alignment.
 471          */
 472
 473         return ALIGN(base + idx, step) - base;
 474 }
 475
 476 static unsigned long __init align_off(struct bootmem_data *bdata,
 477                                       unsigned long off, unsigned long align)
 478 {
 479         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 480
 481         /* Same as align_idx for byte offsets */
 482
 483         return ALIGN(base + off, align) - base;
 484 }
 485
 486 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 487                                         unsigned long size, unsigned long align,
 488                                         unsigned long goal, unsigned long limit)
 489 {
 490         unsigned long fallback = 0;
 491         unsigned long min, max, start, sidx, midx, step;
 492
 493         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 494                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 495                 align, goal, limit);
 496
 497         BUG_ON(!size);
 498         BUG_ON(align & (align - 1));
 499         BUG_ON(limit && goal + size > limit);
 500
 501         if (!bdata->node_bootmem_map)
 502                 return NULL;
 503
 504         min = bdata->node_min_pfn;
 505         max = bdata->node_low_pfn;
 506
 507         goal >>= PAGE_SHIFT;
 508         limit >>= PAGE_SHIFT;
 509
 510         if (limit && max > limit)
 511                 max = limit;
 512         if (max <= min)
 513                 return NULL;
 514
 515         step = max(align >> PAGE_SHIFT, 1UL);
 516
 517         if (goal && min < goal && goal < max)
 518                 start = ALIGN(goal, step);
 519         else
 520                 start = ALIGN(min, step);
 521
 522         sidx = start - bdata->node_min_pfn;
 523         midx = max - bdata->node_min_pfn;
 524
 525         if (bdata->hint_idx > sidx) {
 526                 /*
 527                  * Handle the valid case of sidx being zero and still
 528                  * catch the fallback below.
 529                  */
 530                 fallback = sidx + 1;
 531                 sidx = align_idx(bdata, bdata->hint_idx, step);
 532         }
 533
 534         while (1) {
 535                 int merge;
 536                 void *region;
 537                 unsigned long eidx, i, start_off, end_off;
 538 find_block:
 539                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 540                 sidx = align_idx(bdata, sidx, step);
 541                 eidx = sidx + PFN_UP(size);
 542
 543                 if (sidx >= midx || eidx > midx)
 544                         break;
 545
 546                 for (i = sidx; i < eidx; i++)
 547                         if (test_bit(i, bdata->node_bootmem_map)) {
 548                                 sidx = align_idx(bdata, i, step);
 549                                 if (sidx == i)
 550                                         sidx += step;
 551                                 goto find_block;
 552                         }
 553
 554                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 555                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 556                         start_off = align_off(bdata, bdata->last_end_off, align);
 557                 else
 558                         start_off = PFN_PHYS(sidx);
 559
 560                 merge = PFN_DOWN(start_off) < sidx;
 561                 end_off = start_off + size;
 562
 563                 bdata->last_end_off = end_off;
 564                 bdata->hint_idx = PFN_UP(end_off);
 565
 566                 /*
 567                  * Reserve the area now:
 568                  */
 569                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 570                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 571                         BUG();
 572
 573                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 574                                 start_off);
 575                 memset(region, 0, size);
 576                 /*
 577                  * The min_count is set to 0 so that bootmem allocated blocks
 578                  * are never reported as leaks.
 579                  */
 580                 kmemleak_alloc(region, size, 0, 0);
 581                 return region;
 582         }
 583
 584         if (fallback) {
 585                 sidx = align_idx(bdata, fallback - 1, step);
 586                 fallback = 0;
 587                 goto find_block;
 588         }
 589
 590         return NULL;
 591 }
 592
 593 static void * __init alloc_bootmem_core(unsigned long size,
 594                                         unsigned long align,
 595                                         unsigned long goal,
 596                                         unsigned long limit)
 597 {
 598         bootmem_data_t *bdata;
 599         void *region;
 600
 601         if (WARN_ON_ONCE(slab_is_available()))
 602                 return kzalloc(size, GFP_NOWAIT);
 603
 604         list_for_each_entry(bdata, &bdata_list, list) {
 605                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 606                         continue;
 607                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 608                         break;
 609
 610                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 611                 if (region)
 612                         return region;
 613         }
 614
 615         return NULL;
 616 }
 617
 618 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 619                                               unsigned long align,
 620                                               unsigned long goal,
 621                                               unsigned long limit)
 622 {
 623         void *ptr;
 624
 625 restart:
 626         ptr = alloc_bootmem_core(size, align, goal, limit);
 627         if (ptr)
 628                 return ptr;
 629         if (goal) {
 630                 goal = 0;
 631                 goto restart;
 632         }
 633
 634         return NULL;
 635 }
 636
 637 /**
 638  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 639  * @size: size of the request in bytes
 640  * @align: alignment of the region
 641  * @goal: preferred starting address of the region
 642  *
 643  * The goal is dropped if it can not be satisfied and the allocation will
 644  * fall back to memory below @goal.
 645  *
 646  * Allocation may happen on any node in the system.
 647  *
 648  * Returns NULL on failure.
 649  */
 650 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 651                                         unsigned long goal)
 652 {
 653         unsigned long limit = 0;
 654
 655         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 656 }
 657
 658 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 659                                         unsigned long goal, unsigned long limit)
 660 {
 661         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 662
 663         if (mem)
 664                 return mem;
 665         /*
 666          * Whoops, we cannot satisfy the allocation request.
 667          */
 668         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 669         panic("Out of memory");
 670         return NULL;
 671 }
 672
 673 /**
 674  * __alloc_bootmem - allocate boot memory
 675  * @size: size of the request in bytes
 676  * @align: alignment of the region
 677  * @goal: preferred starting address of the region
 678  *
 679  * The goal is dropped if it can not be satisfied and the allocation will
 680  * fall back to memory below @goal.
 681  *
 682  * Allocation may happen on any node in the system.
 683  *
 684  * The function panics if the request can not be satisfied.
 685  */
 686 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 687                               unsigned long goal)
 688 {
 689         unsigned long limit = 0;
 690
 691         return ___alloc_bootmem(size, align, goal, limit);
 692 }
 693
 694 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 695                                 unsigned long size, unsigned long align,
 696                                 unsigned long goal, unsigned long limit)
 697 {
 698         void *ptr;
 699
 700         if (WARN_ON_ONCE(slab_is_available()))
 701                 return kzalloc(size, GFP_NOWAIT);
 702 again:
 703
 704         /* do not panic in alloc_bootmem_bdata() */
 705         if (limit && goal + size > limit)
 706                 limit = 0;
 707
 708         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 709         if (ptr)
 710                 return ptr;
 711
 712         ptr = alloc_bootmem_core(size, align, goal, limit);
 713         if (ptr)
 714                 return ptr;
 715
 716         if (goal) {
 717                 goal = 0;
 718                 goto again;
 719         }
 720
 721         return NULL;
 722 }
 723
 724 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 725                                    unsigned long align, unsigned long goal)
 726 {
 727         if (WARN_ON_ONCE(slab_is_available()))
 728                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 729
 730         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 731 }
 732
 733 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 734                                     unsigned long align, unsigned long goal,
 735                                     unsigned long limit)
 736 {
 737         void *ptr;
 738
 739         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 740         if (ptr)
 741                 return ptr;
 742
 743         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 744         panic("Out of memory");
 745         return NULL;
 746 }
 747
 748 /**
 749  * __alloc_bootmem_node - allocate boot memory from a specific node
 750  * @pgdat: node to allocate from
 751  * @size: size of the request in bytes
 752  * @align: alignment of the region
 753  * @goal: preferred starting address of the region
 754  *
 755  * The goal is dropped if it can not be satisfied and the allocation will
 756  * fall back to memory below @goal.
 757  *
 758  * Allocation may fall back to any node in the system if the specified node
 759  * can not hold the requested memory.
 760  *
 761  * The function panics if the request can not be satisfied.
 762  */
 763 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 764                                    unsigned long align, unsigned long goal)
 765 {
 766         if (WARN_ON_ONCE(slab_is_available()))
 767                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 768
 769         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 770 }
 771
 772 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 773                                    unsigned long align, unsigned long goal)
 774 {
 775 #ifdef MAX_DMA32_PFN
 776         unsigned long end_pfn;
 777
 778         if (WARN_ON_ONCE(slab_is_available()))
 779                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 780
 781         /* update goal according ...MAX_DMA32_PFN */
 782         end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 783
 784         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 785             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 786                 void *ptr;
 787                 unsigned long new_goal;
 788
 789                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 790                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 791                                                  new_goal, 0);
 792                 if (ptr)
 793                         return ptr;
 794         }
 795 #endif
 796
 797         return __alloc_bootmem_node(pgdat, size, align, goal);
 798
 799 }
 800
 801 #ifndef ARCH_LOW_ADDRESS_LIMIT
 802 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 803 #endif
 804
 805 /**
 806  * __alloc_bootmem_low - allocate low boot memory
 807  * @size: size of the request in bytes
 808  * @align: alignment of the region
 809  * @goal: preferred starting address of the region
 810  *
 811  * The goal is dropped if it can not be satisfied and the allocation will
 812  * fall back to memory below @goal.
 813  *
 814  * Allocation may happen on any node in the system.
 815  *
 816  * The function panics if the request can not be satisfied.
 817  */
 818 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 819                                   unsigned long goal)
 820 {
 821         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 822 }
 823
 824 /**
 825  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 826  * @pgdat: node to allocate from
 827  * @size: size of the request in bytes
 828  * @align: alignment of the region
 829  * @goal: preferred starting address of the region
 830  *
 831  * The goal is dropped if it can not be satisfied and the allocation will
 832  * fall back to memory below @goal.
 833  *
 834  * Allocation may fall back to any node in the system if the specified node
 835  * can not hold the requested memory.
 836  *
 837  * The function panics if the request can not be satisfied.
 838  */
 839 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 840                                        unsigned long align, unsigned long goal)
 841 {
 842         if (WARN_ON_ONCE(slab_is_available()))
 843                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 844
 845         return ___alloc_bootmem_node(pgdat, size, align,
 846                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 847 }