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/export.h>
  15 #include <linux/kmemleak.h>
  16 #include <linux/range.h>
  17 #include <linux/bug.h>
  18 #include <linux/io.h>
  19 #include <linux/bootmem.h>
  20
  21 #include "internal.h"
  22
  23 #ifndef CONFIG_NEED_MULTIPLE_NODES
  24 struct pglist_data __refdata contig_page_data = {
  25         .bdata = &bootmem_node_data[0]
  26 };
  27 EXPORT_SYMBOL(contig_page_data);
  28 #endif
  29
  30 unsigned long max_low_pfn;
  31 unsigned long min_low_pfn;
  32 unsigned long max_pfn;
  33 unsigned long long max_possible_pfn;
  34
  35 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  36
  37 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  38
  39 static int bootmem_debug;
  40
  41 static int __init bootmem_debug_setup(char *buf)
  42 {
  43         bootmem_debug = 1;
  44         return 0;
  45 }
  46 early_param("bootmem_debug", bootmem_debug_setup);
  47
  48 #define bdebug(fmt, args...) ({                         \
  49         if (unlikely(bootmem_debug))                    \
  50                 pr_info("bootmem::%s " fmt,             \
  51                         __func__, ## args);             \
  52 })
  53
  54 static unsigned long __init bootmap_bytes(unsigned long pages)
  55 {
  56         unsigned long bytes = DIV_ROUND_UP(pages, 8);
  57
  58         return ALIGN(bytes, sizeof(long));
  59 }
  60
  61 /**
  62  * bootmem_bootmap_pages - calculate bitmap size in pages
  63  * @pages: number of pages the bitmap has to represent
  64  */
  65 unsigned long __init bootmem_bootmap_pages(unsigned long pages)
  66 {
  67         unsigned long bytes = bootmap_bytes(pages);
  68
  69         return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
  70 }
  71
  72 /*
  73  * link bdata in order
  74  */
  75 static void __init link_bootmem(bootmem_data_t *bdata)
  76 {
  77         bootmem_data_t *ent;
  78
  79         list_for_each_entry(ent, &bdata_list, list) {
  80                 if (bdata->node_min_pfn < ent->node_min_pfn) {
  81                         list_add_tail(&bdata->list, &ent->list);
  82                         return;
  83                 }
  84         }
  85
  86         list_add_tail(&bdata->list, &bdata_list);
  87 }
  88
  89 /*
  90  * Called once to set up the allocator itself.
  91  */
  92 static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
  93         unsigned long mapstart, unsigned long start, unsigned long end)
  94 {
  95         unsigned long mapsize;
  96
  97         mminit_validate_memmodel_limits(&start, &end);
  98         bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
  99         bdata->node_min_pfn = start;
 100         bdata->node_low_pfn = end;
 101         link_bootmem(bdata);
 102
 103         /*
 104          * Initially all pages are reserved - setup_arch() has to
 105          * register free RAM areas explicitly.
 106          */
 107         mapsize = bootmap_bytes(end - start);
 108         memset(bdata->node_bootmem_map, 0xff, mapsize);
 109
 110         bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
 111                 bdata - bootmem_node_data, start, mapstart, end, mapsize);
 112
 113         return mapsize;
 114 }
 115
 116 /**
 117  * init_bootmem_node - register a node as boot memory
 118  * @pgdat: node to register
 119  * @freepfn: pfn where the bitmap for this node is to be placed
 120  * @startpfn: first pfn on the node
 121  * @endpfn: first pfn after the node
 122  *
 123  * Returns the number of bytes needed to hold the bitmap for this node.
 124  */
 125 unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
 126                                 unsigned long startpfn, unsigned long endpfn)
 127 {
 128         return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
 129 }
 130
 131 /**
 132  * init_bootmem - register boot memory
 133  * @start: pfn where the bitmap is to be placed
 134  * @pages: number of available physical pages
 135  *
 136  * Returns the number of bytes needed to hold the bitmap.
 137  */
 138 unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
 139 {
 140         max_low_pfn = pages;
 141         min_low_pfn = start;
 142         return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
 143 }
 144
 145 /*
 146  * free_bootmem_late - free bootmem pages directly to page allocator
 147  * @addr: starting physical address of the range
 148  * @size: size of the range in bytes
 149  *
 150  * This is only useful when the bootmem allocator has already been torn
 151  * down, but we are still initializing the system.  Pages are given directly
 152  * to the page allocator, no bootmem metadata is updated because it is gone.
 153  */
 154 void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
 155 {
 156         unsigned long cursor, end;
 157
 158         kmemleak_free_part_phys(physaddr, size);
 159
 160         cursor = PFN_UP(physaddr);
 161         end = PFN_DOWN(physaddr + size);
 162
 163         for (; cursor < end; cursor++) {
 164                 __free_pages_bootmem(pfn_to_page(cursor), cursor, 0);
 165                 totalram_pages++;
 166         }
 167 }
 168
 169 static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 170 {
 171         struct page *page;
 172         unsigned long *map, start, end, pages, cur, count = 0;
 173
 174         if (!bdata->node_bootmem_map)
 175                 return 0;
 176
 177         map = bdata->node_bootmem_map;
 178         start = bdata->node_min_pfn;
 179         end = bdata->node_low_pfn;
 180
 181         bdebug("nid=%td start=%lx end=%lx\n",
 182                 bdata - bootmem_node_data, start, end);
 183
 184         while (start < end) {
 185                 unsigned long idx, vec;
 186                 unsigned shift;
 187
 188                 idx = start - bdata->node_min_pfn;
 189                 shift = idx & (BITS_PER_LONG - 1);
 190                 /*
 191                  * vec holds at most BITS_PER_LONG map bits,
 192                  * bit 0 corresponds to start.
 193                  */
 194                 vec = ~map[idx / BITS_PER_LONG];
 195
 196                 if (shift) {
 197                         vec >>= shift;
 198                         if (end - start >= BITS_PER_LONG)
 199                                 vec |= ~map[idx / BITS_PER_LONG + 1] <<
 200                                         (BITS_PER_LONG - shift);
 201                 }
 202                 /*
 203                  * If we have a properly aligned and fully unreserved
 204                  * BITS_PER_LONG block of pages in front of us, free
 205                  * it in one go.
 206                  */
 207                 if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
 208                         int order = ilog2(BITS_PER_LONG);
 209
 210                         __free_pages_bootmem(pfn_to_page(start), start, order);
 211                         count += BITS_PER_LONG;
 212                         start += BITS_PER_LONG;
 213                 } else {
 214                         cur = start;
 215
 216                         start = ALIGN(start + 1, BITS_PER_LONG);
 217                         while (vec && cur != start) {
 218                                 if (vec & 1) {
 219                                         page = pfn_to_page(cur);
 220                                         __free_pages_bootmem(page, cur, 0);
 221                                         count++;
 222                                 }
 223                                 vec >>= 1;
 224                                 ++cur;
 225                         }
 226                 }
 227         }
 228
 229         cur = bdata->node_min_pfn;
 230         page = virt_to_page(bdata->node_bootmem_map);
 231         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 232         pages = bootmem_bootmap_pages(pages);
 233         count += pages;
 234         while (pages--)
 235                 __free_pages_bootmem(page++, cur++, 0);
 236         bdata->node_bootmem_map = NULL;
 237
 238         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 239
 240         return count;
 241 }
 242
 243 static int reset_managed_pages_done __initdata;
 244
 245 void reset_node_managed_pages(pg_data_t *pgdat)
 246 {
 247         struct zone *z;
 248
 249         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 250                 z->managed_pages = 0;
 251 }
 252
 253 void __init reset_all_zones_managed_pages(void)
 254 {
 255         struct pglist_data *pgdat;
 256
 257         if (reset_managed_pages_done)
 258                 return;
 259
 260         for_each_online_pgdat(pgdat)
 261                 reset_node_managed_pages(pgdat);
 262
 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 (WARN_ON(bdata->node_bootmem_map == NULL))
 296                 return;
 297
 298         if (bdata->hint_idx > sidx)
 299                 bdata->hint_idx = sidx;
 300
 301         for (idx = sidx; idx < eidx; idx++)
 302                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 303                         BUG();
 304 }
 305
 306 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 307                         unsigned long eidx, int flags)
 308 {
 309         unsigned long idx;
 310         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 311
 312         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 313                 bdata - bootmem_node_data,
 314                 sidx + bdata->node_min_pfn,
 315                 eidx + bdata->node_min_pfn,
 316                 flags);
 317
 318         if (WARN_ON(bdata->node_bootmem_map == NULL))
 319                 return 0;
 320
 321         for (idx = sidx; idx < eidx; idx++)
 322                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 323                         if (exclusive) {
 324                                 __free(bdata, sidx, idx);
 325                                 return -EBUSY;
 326                         }
 327                         bdebug("silent double reserve of PFN %lx\n",
 328                                 idx + bdata->node_min_pfn);
 329                 }
 330         return 0;
 331 }
 332
 333 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 334                                 unsigned long start, unsigned long end,
 335                                 int reserve, int flags)
 336 {
 337         unsigned long sidx, eidx;
 338
 339         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 340                 bdata - bootmem_node_data, start, end, reserve, flags);
 341
 342         BUG_ON(start < bdata->node_min_pfn);
 343         BUG_ON(end > bdata->node_low_pfn);
 344
 345         sidx = start - bdata->node_min_pfn;
 346         eidx = end - bdata->node_min_pfn;
 347
 348         if (reserve)
 349                 return __reserve(bdata, sidx, eidx, flags);
 350         else
 351                 __free(bdata, sidx, eidx);
 352         return 0;
 353 }
 354
 355 static int __init mark_bootmem(unsigned long start, unsigned long end,
 356                                 int reserve, int flags)
 357 {
 358         unsigned long pos;
 359         bootmem_data_t *bdata;
 360
 361         pos = start;
 362         list_for_each_entry(bdata, &bdata_list, list) {
 363                 int err;
 364                 unsigned long max;
 365
 366                 if (pos < bdata->node_min_pfn ||
 367                     pos >= bdata->node_low_pfn) {
 368                         BUG_ON(pos != start);
 369                         continue;
 370                 }
 371
 372                 max = min(bdata->node_low_pfn, end);
 373
 374                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 375                 if (reserve && err) {
 376                         mark_bootmem(start, pos, 0, 0);
 377                         return err;
 378                 }
 379
 380                 if (max == end)
 381                         return 0;
 382                 pos = bdata->node_low_pfn;
 383         }
 384         BUG();
 385 }
 386
 387 /**
 388  * free_bootmem_node - mark a page range as usable
 389  * @pgdat: node the range resides on
 390  * @physaddr: starting address of the range
 391  * @size: size of the range in bytes
 392  *
 393  * Partial pages will be considered reserved and left as they are.
 394  *
 395  * The range must reside completely on the specified node.
 396  */
 397 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 398                               unsigned long size)
 399 {
 400         unsigned long start, end;
 401
 402         kmemleak_free_part_phys(physaddr, size);
 403
 404         start = PFN_UP(physaddr);
 405         end = PFN_DOWN(physaddr + size);
 406
 407         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 408 }
 409
 410 /**
 411  * free_bootmem - mark a page range as usable
 412  * @addr: starting physical address of the range
 413  * @size: size of the range in bytes
 414  *
 415  * Partial pages will be considered reserved and left as they are.
 416  *
 417  * The range must be contiguous but may span node boundaries.
 418  */
 419 void __init free_bootmem(unsigned long physaddr, unsigned long size)
 420 {
 421         unsigned long start, end;
 422
 423         kmemleak_free_part_phys(physaddr, size);
 424
 425         start = PFN_UP(physaddr);
 426         end = PFN_DOWN(physaddr + size);
 427
 428         mark_bootmem(start, end, 0, 0);
 429 }
 430
 431 /**
 432  * reserve_bootmem_node - mark a page range as reserved
 433  * @pgdat: node the range resides on
 434  * @physaddr: starting address of the range
 435  * @size: size of the range in bytes
 436  * @flags: reservation flags (see linux/bootmem.h)
 437  *
 438  * Partial pages will be reserved.
 439  *
 440  * The range must reside completely on the specified node.
 441  */
 442 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 443                                  unsigned long size, int flags)
 444 {
 445         unsigned long start, end;
 446
 447         start = PFN_DOWN(physaddr);
 448         end = PFN_UP(physaddr + size);
 449
 450         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 451 }
 452
 453 /**
 454  * reserve_bootmem - mark a page range as reserved
 455  * @addr: starting address of the range
 456  * @size: size of the range in bytes
 457  * @flags: reservation flags (see linux/bootmem.h)
 458  *
 459  * Partial pages will be reserved.
 460  *
 461  * The range must be contiguous but may span node boundaries.
 462  */
 463 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 464                             int flags)
 465 {
 466         unsigned long start, end;
 467
 468         start = PFN_DOWN(addr);
 469         end = PFN_UP(addr + size);
 470
 471         return mark_bootmem(start, end, 1, flags);
 472 }
 473
 474 static unsigned long __init align_idx(struct bootmem_data *bdata,
 475                                       unsigned long idx, unsigned long step)
 476 {
 477         unsigned long base = bdata->node_min_pfn;
 478
 479         /*
 480          * Align the index with respect to the node start so that the
 481          * combination of both satisfies the requested alignment.
 482          */
 483
 484         return ALIGN(base + idx, step) - base;
 485 }
 486
 487 static unsigned long __init align_off(struct bootmem_data *bdata,
 488                                       unsigned long off, unsigned long align)
 489 {
 490         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 491
 492         /* Same as align_idx for byte offsets */
 493
 494         return ALIGN(base + off, align) - base;
 495 }
 496
 497 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 498                                         unsigned long size, unsigned long align,
 499                                         unsigned long goal, unsigned long limit)
 500 {
 501         unsigned long fallback = 0;
 502         unsigned long min, max, start, sidx, midx, step;
 503
 504         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 505                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 506                 align, goal, limit);
 507
 508         BUG_ON(!size);
 509         BUG_ON(align & (align - 1));
 510         BUG_ON(limit && goal + size > limit);
 511
 512         if (!bdata->node_bootmem_map)
 513                 return NULL;
 514
 515         min = bdata->node_min_pfn;
 516         max = bdata->node_low_pfn;
 517
 518         goal >>= PAGE_SHIFT;
 519         limit >>= PAGE_SHIFT;
 520
 521         if (limit && max > limit)
 522                 max = limit;
 523         if (max <= min)
 524                 return NULL;
 525
 526         step = max(align >> PAGE_SHIFT, 1UL);
 527
 528         if (goal && min < goal && goal < max)
 529                 start = ALIGN(goal, step);
 530         else
 531                 start = ALIGN(min, step);
 532
 533         sidx = start - bdata->node_min_pfn;
 534         midx = max - bdata->node_min_pfn;
 535
 536         if (bdata->hint_idx > sidx) {
 537                 /*
 538                  * Handle the valid case of sidx being zero and still
 539                  * catch the fallback below.
 540                  */
 541                 fallback = sidx + 1;
 542                 sidx = align_idx(bdata, bdata->hint_idx, step);
 543         }
 544
 545         while (1) {
 546                 int merge;
 547                 void *region;
 548                 unsigned long eidx, i, start_off, end_off;
 549 find_block:
 550                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 551                 sidx = align_idx(bdata, sidx, step);
 552                 eidx = sidx + PFN_UP(size);
 553
 554                 if (sidx >= midx || eidx > midx)
 555                         break;
 556
 557                 for (i = sidx; i < eidx; i++)
 558                         if (test_bit(i, bdata->node_bootmem_map)) {
 559                                 sidx = align_idx(bdata, i, step);
 560                                 if (sidx == i)
 561                                         sidx += step;
 562                                 goto find_block;
 563                         }
 564
 565                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 566                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 567                         start_off = align_off(bdata, bdata->last_end_off, align);
 568                 else
 569                         start_off = PFN_PHYS(sidx);
 570
 571                 merge = PFN_DOWN(start_off) < sidx;
 572                 end_off = start_off + size;
 573
 574                 bdata->last_end_off = end_off;
 575                 bdata->hint_idx = PFN_UP(end_off);
 576
 577                 /*
 578                  * Reserve the area now:
 579                  */
 580                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 581                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 582                         BUG();
 583
 584                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 585                                 start_off);
 586                 memset(region, 0, size);
 587                 /*
 588                  * The min_count is set to 0 so that bootmem allocated blocks
 589                  * are never reported as leaks.
 590                  */
 591                 kmemleak_alloc(region, size, 0, 0);
 592                 return region;
 593         }
 594
 595         if (fallback) {
 596                 sidx = align_idx(bdata, fallback - 1, step);
 597                 fallback = 0;
 598                 goto find_block;
 599         }
 600
 601         return NULL;
 602 }
 603
 604 static void * __init alloc_bootmem_core(unsigned long size,
 605                                         unsigned long align,
 606                                         unsigned long goal,
 607                                         unsigned long limit)
 608 {
 609         bootmem_data_t *bdata;
 610         void *region;
 611
 612         if (WARN_ON_ONCE(slab_is_available()))
 613                 return kzalloc(size, GFP_NOWAIT);
 614
 615         list_for_each_entry(bdata, &bdata_list, list) {
 616                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 617                         continue;
 618                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 619                         break;
 620
 621                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 622                 if (region)
 623                         return region;
 624         }
 625
 626         return NULL;
 627 }
 628
 629 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 630                                               unsigned long align,
 631                                               unsigned long goal,
 632                                               unsigned long limit)
 633 {
 634         void *ptr;
 635
 636 restart:
 637         ptr = alloc_bootmem_core(size, align, goal, limit);
 638         if (ptr)
 639                 return ptr;
 640         if (goal) {
 641                 goal = 0;
 642                 goto restart;
 643         }
 644
 645         return NULL;
 646 }
 647
 648 /**
 649  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 650  * @size: size of the request in bytes
 651  * @align: alignment of the region
 652  * @goal: preferred starting address of the region
 653  *
 654  * The goal is dropped if it can not be satisfied and the allocation will
 655  * fall back to memory below @goal.
 656  *
 657  * Allocation may happen on any node in the system.
 658  *
 659  * Returns NULL on failure.
 660  */
 661 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 662                                         unsigned long goal)
 663 {
 664         unsigned long limit = 0;
 665
 666         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 667 }
 668
 669 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 670                                         unsigned long goal, unsigned long limit)
 671 {
 672         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 673
 674         if (mem)
 675                 return mem;
 676         /*
 677          * Whoops, we cannot satisfy the allocation request.
 678          */
 679         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 680         panic("Out of memory");
 681         return NULL;
 682 }
 683
 684 /**
 685  * __alloc_bootmem - allocate boot memory
 686  * @size: size of the request in bytes
 687  * @align: alignment of the region
 688  * @goal: preferred starting address of the region
 689  *
 690  * The goal is dropped if it can not be satisfied and the allocation will
 691  * fall back to memory below @goal.
 692  *
 693  * Allocation may happen on any node in the system.
 694  *
 695  * The function panics if the request can not be satisfied.
 696  */
 697 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 698                               unsigned long goal)
 699 {
 700         unsigned long limit = 0;
 701
 702         return ___alloc_bootmem(size, align, goal, limit);
 703 }
 704
 705 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 706                                 unsigned long size, unsigned long align,
 707                                 unsigned long goal, unsigned long limit)
 708 {
 709         void *ptr;
 710
 711         if (WARN_ON_ONCE(slab_is_available()))
 712                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 713 again:
 714
 715         /* do not panic in alloc_bootmem_bdata() */
 716         if (limit && goal + size > limit)
 717                 limit = 0;
 718
 719         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 720         if (ptr)
 721                 return ptr;
 722
 723         ptr = alloc_bootmem_core(size, align, goal, limit);
 724         if (ptr)
 725                 return ptr;
 726
 727         if (goal) {
 728                 goal = 0;
 729                 goto again;
 730         }
 731
 732         return NULL;
 733 }
 734
 735 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 736                                    unsigned long align, unsigned long goal)
 737 {
 738         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 739 }
 740
 741 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 742                                     unsigned long align, unsigned long goal,
 743                                     unsigned long limit)
 744 {
 745         void *ptr;
 746
 747         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 748         if (ptr)
 749                 return ptr;
 750
 751         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 752         panic("Out of memory");
 753         return NULL;
 754 }
 755
 756 /**
 757  * __alloc_bootmem_node - allocate boot memory from a specific node
 758  * @pgdat: node to allocate from
 759  * @size: size of the request in bytes
 760  * @align: alignment of the region
 761  * @goal: preferred starting address of the region
 762  *
 763  * The goal is dropped if it can not be satisfied and the allocation will
 764  * fall back to memory below @goal.
 765  *
 766  * Allocation may fall back to any node in the system if the specified node
 767  * can not hold the requested memory.
 768  *
 769  * The function panics if the request can not be satisfied.
 770  */
 771 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 772                                    unsigned long align, unsigned long goal)
 773 {
 774         if (WARN_ON_ONCE(slab_is_available()))
 775                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 776
 777         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 778 }
 779
 780 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 781                                    unsigned long align, unsigned long goal)
 782 {
 783 #ifdef MAX_DMA32_PFN
 784         unsigned long end_pfn;
 785
 786         if (WARN_ON_ONCE(slab_is_available()))
 787                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 788
 789         /* update goal according ...MAX_DMA32_PFN */
 790         end_pfn = pgdat_end_pfn(pgdat);
 791
 792         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 793             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 794                 void *ptr;
 795                 unsigned long new_goal;
 796
 797                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 798                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 799                                                  new_goal, 0);
 800                 if (ptr)
 801                         return ptr;
 802         }
 803 #endif
 804
 805         return __alloc_bootmem_node(pgdat, size, align, goal);
 806
 807 }
 808
 809 /**
 810  * __alloc_bootmem_low - allocate low boot memory
 811  * @size: size of the request in bytes
 812  * @align: alignment of the region
 813  * @goal: preferred starting address of the region
 814  *
 815  * The goal is dropped if it can not be satisfied and the allocation will
 816  * fall back to memory below @goal.
 817  *
 818  * Allocation may happen on any node in the system.
 819  *
 820  * The function panics if the request can not be satisfied.
 821  */
 822 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 823                                   unsigned long goal)
 824 {
 825         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 826 }
 827
 828 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 829                                           unsigned long align,
 830                                           unsigned long goal)
 831 {
 832         return ___alloc_bootmem_nopanic(size, align, goal,
 833                                         ARCH_LOW_ADDRESS_LIMIT);
 834 }
 835
 836 /**
 837  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 838  * @pgdat: node to allocate from
 839  * @size: size of the request in bytes
 840  * @align: alignment of the region
 841  * @goal: preferred starting address of the region
 842  *
 843  * The goal is dropped if it can not be satisfied and the allocation will
 844  * fall back to memory below @goal.
 845  *
 846  * Allocation may fall back to any node in the system if the specified node
 847  * can not hold the requested memory.
 848  *
 849  * The function panics if the request can not be satisfied.
 850  */
 851 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 852                                        unsigned long align, unsigned long goal)
 853 {
 854         if (WARN_ON_ONCE(slab_is_available()))
 855                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 856
 857         return ___alloc_bootmem_node(pgdat, size, align,
 858                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 859 }