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