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 #include <linux/bug.h>
  20 #include <linux/io.h>
  21
  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 *map, start, end, pages, count = 0;
 176
 177         if (!bdata->node_bootmem_map)
 178                 return 0;
 179
 180         map = bdata->node_bootmem_map;
 181         start = bdata->node_min_pfn;
 182         end = bdata->node_low_pfn;
 183
 184         bdebug("nid=%td start=%lx end=%lx\n",
 185                 bdata - bootmem_node_data, start, end);
 186
 187         while (start < end) {
 188                 unsigned long idx, vec;
 189                 unsigned shift;
 190
 191                 idx = start - bdata->node_min_pfn;
 192                 shift = idx & (BITS_PER_LONG - 1);
 193                 /*
 194                  * vec holds at most BITS_PER_LONG map bits,
 195                  * bit 0 corresponds to start.
 196                  */
 197                 vec = ~map[idx / BITS_PER_LONG];
 198
 199                 if (shift) {
 200                         vec >>= shift;
 201                         if (end - start >= BITS_PER_LONG)
 202                                 vec |= ~map[idx / BITS_PER_LONG + 1] <<
 203                                         (BITS_PER_LONG - shift);
 204                 }
 205                 /*
 206                  * If we have a properly aligned and fully unreserved
 207                  * BITS_PER_LONG block of pages in front of us, free
 208                  * it in one go.
 209                  */
 210                 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
 211                         int order = ilog2(BITS_PER_LONG);
 212
 213                         __free_pages_bootmem(pfn_to_page(start), order);
 214                         count += BITS_PER_LONG;
 215                         start += BITS_PER_LONG;
 216                 } else {
 217                         unsigned long cur = start;
 218
 219                         start = ALIGN(start + 1, BITS_PER_LONG);
 220                         while (vec && cur != start) {
 221                                 if (vec & 1) {
 222                                         page = pfn_to_page(cur);
 223                                         __free_pages_bootmem(page, 0);
 224                                         count++;
 225                                 }
 226                                 vec >>= 1;
 227                                 ++cur;
 228                         }
 229                 }
 230         }
 231
 232         page = virt_to_page(bdata->node_bootmem_map);
 233         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 234         pages = bootmem_bootmap_pages(pages);
 235         count += pages;
 236         while (pages--)
 237                 __free_pages_bootmem(page++, 0);
 238
 239         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 240
 241         return count;
 242 }
 243
 244 static int reset_managed_pages_done __initdata;
 245
 246 void reset_node_managed_pages(pg_data_t *pgdat)
 247 {
 248         struct zone *z;
 249
 250         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 251                 z->managed_pages = 0;
 252 }
 253
 254 void __init reset_all_zones_managed_pages(void)
 255 {
 256         struct pglist_data *pgdat;
 257
 258         if (reset_managed_pages_done)
 259                 return;
 260
 261         for_each_online_pgdat(pgdat)
 262                 reset_node_managed_pages(pgdat);
 263
 264         reset_managed_pages_done = 1;
 265 }
 266
 267 /**
 268  * free_all_bootmem - release free pages to the buddy allocator
 269  *
 270  * Returns the number of pages actually released.
 271  */
 272 unsigned long __init free_all_bootmem(void)
 273 {
 274         unsigned long total_pages = 0;
 275         bootmem_data_t *bdata;
 276
 277         reset_all_zones_managed_pages();
 278
 279         list_for_each_entry(bdata, &bdata_list, list)
 280                 total_pages += free_all_bootmem_core(bdata);
 281
 282         totalram_pages += total_pages;
 283
 284         return total_pages;
 285 }
 286
 287 static void __init __free(bootmem_data_t *bdata,
 288                         unsigned long sidx, unsigned long eidx)
 289 {
 290         unsigned long idx;
 291
 292         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 293                 sidx + bdata->node_min_pfn,
 294                 eidx + bdata->node_min_pfn);
 295
 296         if (bdata->hint_idx > sidx)
 297                 bdata->hint_idx = sidx;
 298
 299         for (idx = sidx; idx < eidx; idx++)
 300                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 301                         BUG();
 302 }
 303
 304 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 305                         unsigned long eidx, int flags)
 306 {
 307         unsigned long idx;
 308         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 309
 310         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 311                 bdata - bootmem_node_data,
 312                 sidx + bdata->node_min_pfn,
 313                 eidx + bdata->node_min_pfn,
 314                 flags);
 315
 316         for (idx = sidx; idx < eidx; idx++)
 317                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 318                         if (exclusive) {
 319                                 __free(bdata, sidx, idx);
 320                                 return -EBUSY;
 321                         }
 322                         bdebug("silent double reserve of PFN %lx\n",
 323                                 idx + bdata->node_min_pfn);
 324                 }
 325         return 0;
 326 }
 327
 328 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 329                                 unsigned long start, unsigned long end,
 330                                 int reserve, int flags)
 331 {
 332         unsigned long sidx, eidx;
 333
 334         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 335                 bdata - bootmem_node_data, start, end, reserve, flags);
 336
 337         BUG_ON(start < bdata->node_min_pfn);
 338         BUG_ON(end > bdata->node_low_pfn);
 339
 340         sidx = start - bdata->node_min_pfn;
 341         eidx = end - bdata->node_min_pfn;
 342
 343         if (reserve)
 344                 return __reserve(bdata, sidx, eidx, flags);
 345         else
 346                 __free(bdata, sidx, eidx);
 347         return 0;
 348 }
 349
 350 static int __init mark_bootmem(unsigned long start, unsigned long end,
 351                                 int reserve, int flags)
 352 {
 353         unsigned long pos;
 354         bootmem_data_t *bdata;
 355
 356         pos = start;
 357         list_for_each_entry(bdata, &bdata_list, list) {
 358                 int err;
 359                 unsigned long max;
 360
 361                 if (pos < bdata->node_min_pfn ||
 362                     pos >= bdata->node_low_pfn) {
 363                         BUG_ON(pos != start);
 364                         continue;
 365                 }
 366
 367                 max = min(bdata->node_low_pfn, end);
 368
 369                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 370                 if (reserve && err) {
 371                         mark_bootmem(start, pos, 0, 0);
 372                         return err;
 373                 }
 374
 375                 if (max == end)
 376                         return 0;
 377                 pos = bdata->node_low_pfn;
 378         }
 379         BUG();
 380 }
 381
 382 /**
 383  * free_bootmem_node - mark a page range as usable
 384  * @pgdat: node the range resides on
 385  * @physaddr: starting address of the range
 386  * @size: size of the range in bytes
 387  *
 388  * Partial pages will be considered reserved and left as they are.
 389  *
 390  * The range must reside completely on the specified node.
 391  */
 392 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 393                               unsigned long size)
 394 {
 395         unsigned long start, end;
 396
 397         kmemleak_free_part(__va(physaddr), size);
 398
 399         start = PFN_UP(physaddr);
 400         end = PFN_DOWN(physaddr + size);
 401
 402         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 403 }
 404
 405 /**
 406  * free_bootmem - mark a page range as usable
 407  * @addr: starting physical address of the range
 408  * @size: size of the range in bytes
 409  *
 410  * Partial pages will be considered reserved and left as they are.
 411  *
 412  * The range must be contiguous but may span node boundaries.
 413  */
 414 void __init free_bootmem(unsigned long physaddr, unsigned long size)
 415 {
 416         unsigned long start, end;
 417
 418         kmemleak_free_part(__va(physaddr), size);
 419
 420         start = PFN_UP(physaddr);
 421         end = PFN_DOWN(physaddr + size);
 422
 423         mark_bootmem(start, end, 0, 0);
 424 }
 425
 426 /**
 427  * reserve_bootmem_node - mark a page range as reserved
 428  * @pgdat: node the range resides on
 429  * @physaddr: starting address of the range
 430  * @size: size of the range in bytes
 431  * @flags: reservation flags (see linux/bootmem.h)
 432  *
 433  * Partial pages will be reserved.
 434  *
 435  * The range must reside completely on the specified node.
 436  */
 437 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 438                                  unsigned long size, int flags)
 439 {
 440         unsigned long start, end;
 441
 442         start = PFN_DOWN(physaddr);
 443         end = PFN_UP(physaddr + size);
 444
 445         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 446 }
 447
 448 /**
 449  * reserve_bootmem - mark a page range as reserved
 450  * @addr: starting address of the range
 451  * @size: size of the range in bytes
 452  * @flags: reservation flags (see linux/bootmem.h)
 453  *
 454  * Partial pages will be reserved.
 455  *
 456  * The range must be contiguous but may span node boundaries.
 457  */
 458 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 459                             int flags)
 460 {
 461         unsigned long start, end;
 462
 463         start = PFN_DOWN(addr);
 464         end = PFN_UP(addr + size);
 465
 466         return mark_bootmem(start, end, 1, flags);
 467 }
 468
 469 static unsigned long __init align_idx(struct bootmem_data *bdata,
 470                                       unsigned long idx, unsigned long step)
 471 {
 472         unsigned long base = bdata->node_min_pfn;
 473
 474         /*
 475          * Align the index with respect to the node start so that the
 476          * combination of both satisfies the requested alignment.
 477          */
 478
 479         return ALIGN(base + idx, step) - base;
 480 }
 481
 482 static unsigned long __init align_off(struct bootmem_data *bdata,
 483                                       unsigned long off, unsigned long align)
 484 {
 485         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 486
 487         /* Same as align_idx for byte offsets */
 488
 489         return ALIGN(base + off, align) - base;
 490 }
 491
 492 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 493                                         unsigned long size, unsigned long align,
 494                                         unsigned long goal, unsigned long limit)
 495 {
 496         unsigned long fallback = 0;
 497         unsigned long min, max, start, sidx, midx, step;
 498
 499         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 500                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 501                 align, goal, limit);
 502
 503         BUG_ON(!size);
 504         BUG_ON(align & (align - 1));
 505         BUG_ON(limit && goal + size > limit);
 506
 507         if (!bdata->node_bootmem_map)
 508                 return NULL;
 509
 510         min = bdata->node_min_pfn;
 511         max = bdata->node_low_pfn;
 512
 513         goal >>= PAGE_SHIFT;
 514         limit >>= PAGE_SHIFT;
 515
 516         if (limit && max > limit)
 517                 max = limit;
 518         if (max <= min)
 519                 return NULL;
 520
 521         step = max(align >> PAGE_SHIFT, 1UL);
 522
 523         if (goal && min < goal && goal < max)
 524                 start = ALIGN(goal, step);
 525         else
 526                 start = ALIGN(min, step);
 527
 528         sidx = start - bdata->node_min_pfn;
 529         midx = max - bdata->node_min_pfn;
 530
 531         if (bdata->hint_idx > sidx) {
 532                 /*
 533                  * Handle the valid case of sidx being zero and still
 534                  * catch the fallback below.
 535                  */
 536                 fallback = sidx + 1;
 537                 sidx = align_idx(bdata, bdata->hint_idx, step);
 538         }
 539
 540         while (1) {
 541                 int merge;
 542                 void *region;
 543                 unsigned long eidx, i, start_off, end_off;
 544 find_block:
 545                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 546                 sidx = align_idx(bdata, sidx, step);
 547                 eidx = sidx + PFN_UP(size);
 548
 549                 if (sidx >= midx || eidx > midx)
 550                         break;
 551
 552                 for (i = sidx; i < eidx; i++)
 553                         if (test_bit(i, bdata->node_bootmem_map)) {
 554                                 sidx = align_idx(bdata, i, step);
 555                                 if (sidx == i)
 556                                         sidx += step;
 557                                 goto find_block;
 558                         }
 559
 560                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 561                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 562                         start_off = align_off(bdata, bdata->last_end_off, align);
 563                 else
 564                         start_off = PFN_PHYS(sidx);
 565
 566                 merge = PFN_DOWN(start_off) < sidx;
 567                 end_off = start_off + size;
 568
 569                 bdata->last_end_off = end_off;
 570                 bdata->hint_idx = PFN_UP(end_off);
 571
 572                 /*
 573                  * Reserve the area now:
 574                  */
 575                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 576                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 577                         BUG();
 578
 579                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 580                                 start_off);
 581                 memset(region, 0, size);
 582                 /*
 583                  * The min_count is set to 0 so that bootmem allocated blocks
 584                  * are never reported as leaks.
 585                  */
 586                 kmemleak_alloc(region, size, 0, 0);
 587                 return region;
 588         }
 589
 590         if (fallback) {
 591                 sidx = align_idx(bdata, fallback - 1, step);
 592                 fallback = 0;
 593                 goto find_block;
 594         }
 595
 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         if (WARN_ON_ONCE(slab_is_available()))
 608                 return kzalloc(size, GFP_NOWAIT);
 609
 610         list_for_each_entry(bdata, &bdata_list, list) {
 611                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 612                         continue;
 613                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 614                         break;
 615
 616                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 617                 if (region)
 618                         return region;
 619         }
 620
 621         return NULL;
 622 }
 623
 624 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 625                                               unsigned long align,
 626                                               unsigned long goal,
 627                                               unsigned long limit)
 628 {
 629         void *ptr;
 630
 631 restart:
 632         ptr = alloc_bootmem_core(size, align, goal, limit);
 633         if (ptr)
 634                 return ptr;
 635         if (goal) {
 636                 goal = 0;
 637                 goto restart;
 638         }
 639
 640         return NULL;
 641 }
 642
 643 /**
 644  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 645  * @size: size of the request in bytes
 646  * @align: alignment of the region
 647  * @goal: preferred starting address of the region
 648  *
 649  * The goal is dropped if it can not be satisfied and the allocation will
 650  * fall back to memory below @goal.
 651  *
 652  * Allocation may happen on any node in the system.
 653  *
 654  * Returns NULL on failure.
 655  */
 656 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 657                                         unsigned long goal)
 658 {
 659         unsigned long limit = 0;
 660
 661         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 662 }
 663
 664 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 665                                         unsigned long goal, unsigned long limit)
 666 {
 667         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 668
 669         if (mem)
 670                 return mem;
 671         /*
 672          * Whoops, we cannot satisfy the allocation request.
 673          */
 674         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 675         panic("Out of memory");
 676         return NULL;
 677 }
 678
 679 /**
 680  * __alloc_bootmem - allocate boot memory
 681  * @size: size of the request in bytes
 682  * @align: alignment of the region
 683  * @goal: preferred starting address of the region
 684  *
 685  * The goal is dropped if it can not be satisfied and the allocation will
 686  * fall back to memory below @goal.
 687  *
 688  * Allocation may happen on any node in the system.
 689  *
 690  * The function panics if the request can not be satisfied.
 691  */
 692 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 693                               unsigned long goal)
 694 {
 695         unsigned long limit = 0;
 696
 697         return ___alloc_bootmem(size, align, goal, limit);
 698 }
 699
 700 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 701                                 unsigned long size, unsigned long align,
 702                                 unsigned long goal, unsigned long limit)
 703 {
 704         void *ptr;
 705
 706         if (WARN_ON_ONCE(slab_is_available()))
 707                 return kzalloc(size, GFP_NOWAIT);
 708 again:
 709
 710         /* do not panic in alloc_bootmem_bdata() */
 711         if (limit && goal + size > limit)
 712                 limit = 0;
 713
 714         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 715         if (ptr)
 716                 return ptr;
 717
 718         ptr = alloc_bootmem_core(size, align, goal, limit);
 719         if (ptr)
 720                 return ptr;
 721
 722         if (goal) {
 723                 goal = 0;
 724                 goto again;
 725         }
 726
 727         return NULL;
 728 }
 729
 730 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 731                                    unsigned long align, unsigned long goal)
 732 {
 733         if (WARN_ON_ONCE(slab_is_available()))
 734                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 735
 736         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 737 }
 738
 739 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 740                                     unsigned long align, unsigned long goal,
 741                                     unsigned long limit)
 742 {
 743         void *ptr;
 744
 745         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 746         if (ptr)
 747                 return ptr;
 748
 749         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 750         panic("Out of memory");
 751         return NULL;
 752 }
 753
 754 /**
 755  * __alloc_bootmem_node - allocate boot memory from a specific node
 756  * @pgdat: node to allocate from
 757  * @size: size of the request in bytes
 758  * @align: alignment of the region
 759  * @goal: preferred starting address of the region
 760  *
 761  * The goal is dropped if it can not be satisfied and the allocation will
 762  * fall back to memory below @goal.
 763  *
 764  * Allocation may fall back to any node in the system if the specified node
 765  * can not hold the requested memory.
 766  *
 767  * The function panics if the request can not be satisfied.
 768  */
 769 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 770                                    unsigned long align, unsigned long goal)
 771 {
 772         if (WARN_ON_ONCE(slab_is_available()))
 773                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 774
 775         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 776 }
 777
 778 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 779                                    unsigned long align, unsigned long goal)
 780 {
 781 #ifdef MAX_DMA32_PFN
 782         unsigned long end_pfn;
 783
 784         if (WARN_ON_ONCE(slab_is_available()))
 785                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 786
 787         /* update goal according ...MAX_DMA32_PFN */
 788         end_pfn = pgdat_end_pfn(pgdat);
 789
 790         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 791             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 792                 void *ptr;
 793                 unsigned long new_goal;
 794
 795                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 796                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 797                                                  new_goal, 0);
 798                 if (ptr)
 799                         return ptr;
 800         }
 801 #endif
 802
 803         return __alloc_bootmem_node(pgdat, size, align, goal);
 804
 805 }
 806
 807 #ifndef ARCH_LOW_ADDRESS_LIMIT
 808 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 809 #endif
 810
 811 /**
 812  * __alloc_bootmem_low - allocate low boot memory
 813  * @size: size of the request in bytes
 814  * @align: alignment of the region
 815  * @goal: preferred starting address of the region
 816  *
 817  * The goal is dropped if it can not be satisfied and the allocation will
 818  * fall back to memory below @goal.
 819  *
 820  * Allocation may happen on any node in the system.
 821  *
 822  * The function panics if the request can not be satisfied.
 823  */
 824 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 825                                   unsigned long goal)
 826 {
 827         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 828 }
 829
 830 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 831                                           unsigned long align,
 832                                           unsigned long goal)
 833 {
 834         return ___alloc_bootmem_nopanic(size, align, goal,
 835                                         ARCH_LOW_ADDRESS_LIMIT);
 836 }
 837
 838 /**
 839  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 840  * @pgdat: node to allocate from
 841  * @size: size of the request in bytes
 842  * @align: alignment of the region
 843  * @goal: preferred starting address of the region
 844  *
 845  * The goal is dropped if it can not be satisfied and the allocation will
 846  * fall back to memory below @goal.
 847  *
 848  * Allocation may fall back to any node in the system if the specified node
 849  * can not hold the requested memory.
 850  *
 851  * The function panics if the request can not be satisfied.
 852  */
 853 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 854                                        unsigned long align, unsigned long goal)
 855 {
 856         if (WARN_ON_ONCE(slab_is_available()))
 857                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 858
 859         return ___alloc_bootmem_node(pgdat, size, align,
 860                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 861 }