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 unsigned long long max_possible_pfn;
  37
  38 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  39
  40 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  41
  42 static int bootmem_debug;
  43
  44 static int __init bootmem_debug_setup(char *buf)
  45 {
  46         bootmem_debug = 1;
  47         return 0;
  48 }
  49 early_param("bootmem_debug", bootmem_debug_setup);
  50
  51 #define bdebug(fmt, args...) ({                         \
  52         if (unlikely(bootmem_debug))                    \
  53                 pr_info("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), 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, cur, 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), start, order);
 214                         count += BITS_PER_LONG;
 215                         start += BITS_PER_LONG;
 216                 } else {
 217                         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, cur, 0);
 224                                         count++;
 225                                 }
 226                                 vec >>= 1;
 227                                 ++cur;
 228                         }
 229                 }
 230         }
 231
 232         cur = bdata->node_min_pfn;
 233         page = virt_to_page(bdata->node_bootmem_map);
 234         pages = bdata->node_low_pfn - bdata->node_min_pfn;
 235         pages = bootmem_bootmap_pages(pages);
 236         count += pages;
 237         while (pages--)
 238                 __free_pages_bootmem(page++, cur++, 0);
 239         bdata->node_bootmem_map = NULL;
 240
 241         bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 242
 243         return count;
 244 }
 245
 246 static int reset_managed_pages_done __initdata;
 247
 248 void reset_node_managed_pages(pg_data_t *pgdat)
 249 {
 250         struct zone *z;
 251
 252         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 253                 z->managed_pages = 0;
 254 }
 255
 256 void __init reset_all_zones_managed_pages(void)
 257 {
 258         struct pglist_data *pgdat;
 259
 260         if (reset_managed_pages_done)
 261                 return;
 262
 263         for_each_online_pgdat(pgdat)
 264                 reset_node_managed_pages(pgdat);
 265
 266         reset_managed_pages_done = 1;
 267 }
 268
 269 /**
 270  * free_all_bootmem - release free pages to the buddy allocator
 271  *
 272  * Returns the number of pages actually released.
 273  */
 274 unsigned long __init free_all_bootmem(void)
 275 {
 276         unsigned long total_pages = 0;
 277         bootmem_data_t *bdata;
 278
 279         reset_all_zones_managed_pages();
 280
 281         list_for_each_entry(bdata, &bdata_list, list)
 282                 total_pages += free_all_bootmem_core(bdata);
 283
 284         totalram_pages += total_pages;
 285
 286         return total_pages;
 287 }
 288
 289 static void __init __free(bootmem_data_t *bdata,
 290                         unsigned long sidx, unsigned long eidx)
 291 {
 292         unsigned long idx;
 293
 294         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 295                 sidx + bdata->node_min_pfn,
 296                 eidx + bdata->node_min_pfn);
 297
 298         if (WARN_ON(bdata->node_bootmem_map == NULL))
 299                 return;
 300
 301         if (bdata->hint_idx > sidx)
 302                 bdata->hint_idx = sidx;
 303
 304         for (idx = sidx; idx < eidx; idx++)
 305                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 306                         BUG();
 307 }
 308
 309 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 310                         unsigned long eidx, int flags)
 311 {
 312         unsigned long idx;
 313         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 314
 315         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 316                 bdata - bootmem_node_data,
 317                 sidx + bdata->node_min_pfn,
 318                 eidx + bdata->node_min_pfn,
 319                 flags);
 320
 321         if (WARN_ON(bdata->node_bootmem_map == NULL))
 322                 return 0;
 323
 324         for (idx = sidx; idx < eidx; idx++)
 325                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 326                         if (exclusive) {
 327                                 __free(bdata, sidx, idx);
 328                                 return -EBUSY;
 329                         }
 330                         bdebug("silent double reserve of PFN %lx\n",
 331                                 idx + bdata->node_min_pfn);
 332                 }
 333         return 0;
 334 }
 335
 336 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 337                                 unsigned long start, unsigned long end,
 338                                 int reserve, int flags)
 339 {
 340         unsigned long sidx, eidx;
 341
 342         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 343                 bdata - bootmem_node_data, start, end, reserve, flags);
 344
 345         BUG_ON(start < bdata->node_min_pfn);
 346         BUG_ON(end > bdata->node_low_pfn);
 347
 348         sidx = start - bdata->node_min_pfn;
 349         eidx = end - bdata->node_min_pfn;
 350
 351         if (reserve)
 352                 return __reserve(bdata, sidx, eidx, flags);
 353         else
 354                 __free(bdata, sidx, eidx);
 355         return 0;
 356 }
 357
 358 static int __init mark_bootmem(unsigned long start, unsigned long end,
 359                                 int reserve, int flags)
 360 {
 361         unsigned long pos;
 362         bootmem_data_t *bdata;
 363
 364         pos = start;
 365         list_for_each_entry(bdata, &bdata_list, list) {
 366                 int err;
 367                 unsigned long max;
 368
 369                 if (pos < bdata->node_min_pfn ||
 370                     pos >= bdata->node_low_pfn) {
 371                         BUG_ON(pos != start);
 372                         continue;
 373                 }
 374
 375                 max = min(bdata->node_low_pfn, end);
 376
 377                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 378                 if (reserve && err) {
 379                         mark_bootmem(start, pos, 0, 0);
 380                         return err;
 381                 }
 382
 383                 if (max == end)
 384                         return 0;
 385                 pos = bdata->node_low_pfn;
 386         }
 387         BUG();
 388 }
 389
 390 /**
 391  * free_bootmem_node - mark a page range as usable
 392  * @pgdat: node the range resides on
 393  * @physaddr: starting address of the range
 394  * @size: size of the range in bytes
 395  *
 396  * Partial pages will be considered reserved and left as they are.
 397  *
 398  * The range must reside completely on the specified node.
 399  */
 400 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 401                               unsigned long size)
 402 {
 403         unsigned long start, end;
 404
 405         kmemleak_free_part(__va(physaddr), size);
 406
 407         start = PFN_UP(physaddr);
 408         end = PFN_DOWN(physaddr + size);
 409
 410         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 411 }
 412
 413 /**
 414  * free_bootmem - mark a page range as usable
 415  * @addr: starting physical address of the range
 416  * @size: size of the range in bytes
 417  *
 418  * Partial pages will be considered reserved and left as they are.
 419  *
 420  * The range must be contiguous but may span node boundaries.
 421  */
 422 void __init free_bootmem(unsigned long physaddr, unsigned long size)
 423 {
 424         unsigned long start, end;
 425
 426         kmemleak_free_part(__va(physaddr), size);
 427
 428         start = PFN_UP(physaddr);
 429         end = PFN_DOWN(physaddr + size);
 430
 431         mark_bootmem(start, end, 0, 0);
 432 }
 433
 434 /**
 435  * reserve_bootmem_node - mark a page range as reserved
 436  * @pgdat: node the range resides on
 437  * @physaddr: starting address of the range
 438  * @size: size of the range in bytes
 439  * @flags: reservation flags (see linux/bootmem.h)
 440  *
 441  * Partial pages will be reserved.
 442  *
 443  * The range must reside completely on the specified node.
 444  */
 445 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 446                                  unsigned long size, int flags)
 447 {
 448         unsigned long start, end;
 449
 450         start = PFN_DOWN(physaddr);
 451         end = PFN_UP(physaddr + size);
 452
 453         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 454 }
 455
 456 /**
 457  * reserve_bootmem - mark a page range as reserved
 458  * @addr: starting address of the range
 459  * @size: size of the range in bytes
 460  * @flags: reservation flags (see linux/bootmem.h)
 461  *
 462  * Partial pages will be reserved.
 463  *
 464  * The range must be contiguous but may span node boundaries.
 465  */
 466 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 467                             int flags)
 468 {
 469         unsigned long start, end;
 470
 471         start = PFN_DOWN(addr);
 472         end = PFN_UP(addr + size);
 473
 474         return mark_bootmem(start, end, 1, flags);
 475 }
 476
 477 static unsigned long __init align_idx(struct bootmem_data *bdata,
 478                                       unsigned long idx, unsigned long step)
 479 {
 480         unsigned long base = bdata->node_min_pfn;
 481
 482         /*
 483          * Align the index with respect to the node start so that the
 484          * combination of both satisfies the requested alignment.
 485          */
 486
 487         return ALIGN(base + idx, step) - base;
 488 }
 489
 490 static unsigned long __init align_off(struct bootmem_data *bdata,
 491                                       unsigned long off, unsigned long align)
 492 {
 493         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 494
 495         /* Same as align_idx for byte offsets */
 496
 497         return ALIGN(base + off, align) - base;
 498 }
 499
 500 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 501                                         unsigned long size, unsigned long align,
 502                                         unsigned long goal, unsigned long limit)
 503 {
 504         unsigned long fallback = 0;
 505         unsigned long min, max, start, sidx, midx, step;
 506
 507         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 508                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 509                 align, goal, limit);
 510
 511         BUG_ON(!size);
 512         BUG_ON(align & (align - 1));
 513         BUG_ON(limit && goal + size > limit);
 514
 515         if (!bdata->node_bootmem_map)
 516                 return NULL;
 517
 518         min = bdata->node_min_pfn;
 519         max = bdata->node_low_pfn;
 520
 521         goal >>= PAGE_SHIFT;
 522         limit >>= PAGE_SHIFT;
 523
 524         if (limit && max > limit)
 525                 max = limit;
 526         if (max <= min)
 527                 return NULL;
 528
 529         step = max(align >> PAGE_SHIFT, 1UL);
 530
 531         if (goal && min < goal && goal < max)
 532                 start = ALIGN(goal, step);
 533         else
 534                 start = ALIGN(min, step);
 535
 536         sidx = start - bdata->node_min_pfn;
 537         midx = max - bdata->node_min_pfn;
 538
 539         if (bdata->hint_idx > sidx) {
 540                 /*
 541                  * Handle the valid case of sidx being zero and still
 542                  * catch the fallback below.
 543                  */
 544                 fallback = sidx + 1;
 545                 sidx = align_idx(bdata, bdata->hint_idx, step);
 546         }
 547
 548         while (1) {
 549                 int merge;
 550                 void *region;
 551                 unsigned long eidx, i, start_off, end_off;
 552 find_block:
 553                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 554                 sidx = align_idx(bdata, sidx, step);
 555                 eidx = sidx + PFN_UP(size);
 556
 557                 if (sidx >= midx || eidx > midx)
 558                         break;
 559
 560                 for (i = sidx; i < eidx; i++)
 561                         if (test_bit(i, bdata->node_bootmem_map)) {
 562                                 sidx = align_idx(bdata, i, step);
 563                                 if (sidx == i)
 564                                         sidx += step;
 565                                 goto find_block;
 566                         }
 567
 568                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 569                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 570                         start_off = align_off(bdata, bdata->last_end_off, align);
 571                 else
 572                         start_off = PFN_PHYS(sidx);
 573
 574                 merge = PFN_DOWN(start_off) < sidx;
 575                 end_off = start_off + size;
 576
 577                 bdata->last_end_off = end_off;
 578                 bdata->hint_idx = PFN_UP(end_off);
 579
 580                 /*
 581                  * Reserve the area now:
 582                  */
 583                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 584                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 585                         BUG();
 586
 587                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 588                                 start_off);
 589                 memset(region, 0, size);
 590                 /*
 591                  * The min_count is set to 0 so that bootmem allocated blocks
 592                  * are never reported as leaks.
 593                  */
 594                 kmemleak_alloc(region, size, 0, 0);
 595                 return region;
 596         }
 597
 598         if (fallback) {
 599                 sidx = align_idx(bdata, fallback - 1, step);
 600                 fallback = 0;
 601                 goto find_block;
 602         }
 603
 604         return NULL;
 605 }
 606
 607 static void * __init alloc_bootmem_core(unsigned long size,
 608                                         unsigned long align,
 609                                         unsigned long goal,
 610                                         unsigned long limit)
 611 {
 612         bootmem_data_t *bdata;
 613         void *region;
 614
 615         if (WARN_ON_ONCE(slab_is_available()))
 616                 return kzalloc(size, GFP_NOWAIT);
 617
 618         list_for_each_entry(bdata, &bdata_list, list) {
 619                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 620                         continue;
 621                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 622                         break;
 623
 624                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 625                 if (region)
 626                         return region;
 627         }
 628
 629         return NULL;
 630 }
 631
 632 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 633                                               unsigned long align,
 634                                               unsigned long goal,
 635                                               unsigned long limit)
 636 {
 637         void *ptr;
 638
 639 restart:
 640         ptr = alloc_bootmem_core(size, align, goal, limit);
 641         if (ptr)
 642                 return ptr;
 643         if (goal) {
 644                 goal = 0;
 645                 goto restart;
 646         }
 647
 648         return NULL;
 649 }
 650
 651 /**
 652  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 653  * @size: size of the request in bytes
 654  * @align: alignment of the region
 655  * @goal: preferred starting address of the region
 656  *
 657  * The goal is dropped if it can not be satisfied and the allocation will
 658  * fall back to memory below @goal.
 659  *
 660  * Allocation may happen on any node in the system.
 661  *
 662  * Returns NULL on failure.
 663  */
 664 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 665                                         unsigned long goal)
 666 {
 667         unsigned long limit = 0;
 668
 669         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 670 }
 671
 672 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 673                                         unsigned long goal, unsigned long limit)
 674 {
 675         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 676
 677         if (mem)
 678                 return mem;
 679         /*
 680          * Whoops, we cannot satisfy the allocation request.
 681          */
 682         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 683         panic("Out of memory");
 684         return NULL;
 685 }
 686
 687 /**
 688  * __alloc_bootmem - allocate boot memory
 689  * @size: size of the request in bytes
 690  * @align: alignment of the region
 691  * @goal: preferred starting address of the region
 692  *
 693  * The goal is dropped if it can not be satisfied and the allocation will
 694  * fall back to memory below @goal.
 695  *
 696  * Allocation may happen on any node in the system.
 697  *
 698  * The function panics if the request can not be satisfied.
 699  */
 700 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 701                               unsigned long goal)
 702 {
 703         unsigned long limit = 0;
 704
 705         return ___alloc_bootmem(size, align, goal, limit);
 706 }
 707
 708 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 709                                 unsigned long size, unsigned long align,
 710                                 unsigned long goal, unsigned long limit)
 711 {
 712         void *ptr;
 713
 714         if (WARN_ON_ONCE(slab_is_available()))
 715                 return kzalloc(size, GFP_NOWAIT);
 716 again:
 717
 718         /* do not panic in alloc_bootmem_bdata() */
 719         if (limit && goal + size > limit)
 720                 limit = 0;
 721
 722         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 723         if (ptr)
 724                 return ptr;
 725
 726         ptr = alloc_bootmem_core(size, align, goal, limit);
 727         if (ptr)
 728                 return ptr;
 729
 730         if (goal) {
 731                 goal = 0;
 732                 goto again;
 733         }
 734
 735         return NULL;
 736 }
 737
 738 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 739                                    unsigned long align, unsigned long goal)
 740 {
 741         if (WARN_ON_ONCE(slab_is_available()))
 742                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 743
 744         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 745 }
 746
 747 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 748                                     unsigned long align, unsigned long goal,
 749                                     unsigned long limit)
 750 {
 751         void *ptr;
 752
 753         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 754         if (ptr)
 755                 return ptr;
 756
 757         pr_alert("bootmem alloc of %lu bytes failed!\n", size);
 758         panic("Out of memory");
 759         return NULL;
 760 }
 761
 762 /**
 763  * __alloc_bootmem_node - allocate boot memory from a specific node
 764  * @pgdat: node to allocate from
 765  * @size: size of the request in bytes
 766  * @align: alignment of the region
 767  * @goal: preferred starting address of the region
 768  *
 769  * The goal is dropped if it can not be satisfied and the allocation will
 770  * fall back to memory below @goal.
 771  *
 772  * Allocation may fall back to any node in the system if the specified node
 773  * can not hold the requested memory.
 774  *
 775  * The function panics if the request can not be satisfied.
 776  */
 777 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 778                                    unsigned long align, unsigned long goal)
 779 {
 780         if (WARN_ON_ONCE(slab_is_available()))
 781                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 782
 783         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 784 }
 785
 786 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 787                                    unsigned long align, unsigned long goal)
 788 {
 789 #ifdef MAX_DMA32_PFN
 790         unsigned long end_pfn;
 791
 792         if (WARN_ON_ONCE(slab_is_available()))
 793                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 794
 795         /* update goal according ...MAX_DMA32_PFN */
 796         end_pfn = pgdat_end_pfn(pgdat);
 797
 798         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 799             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 800                 void *ptr;
 801                 unsigned long new_goal;
 802
 803                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 804                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 805                                                  new_goal, 0);
 806                 if (ptr)
 807                         return ptr;
 808         }
 809 #endif
 810
 811         return __alloc_bootmem_node(pgdat, size, align, goal);
 812
 813 }
 814
 815 #ifndef ARCH_LOW_ADDRESS_LIMIT
 816 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 817 #endif
 818
 819 /**
 820  * __alloc_bootmem_low - allocate low boot memory
 821  * @size: size of the request in bytes
 822  * @align: alignment of the region
 823  * @goal: preferred starting address of the region
 824  *
 825  * The goal is dropped if it can not be satisfied and the allocation will
 826  * fall back to memory below @goal.
 827  *
 828  * Allocation may happen on any node in the system.
 829  *
 830  * The function panics if the request can not be satisfied.
 831  */
 832 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 833                                   unsigned long goal)
 834 {
 835         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 836 }
 837
 838 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 839                                           unsigned long align,
 840                                           unsigned long goal)
 841 {
 842         return ___alloc_bootmem_nopanic(size, align, goal,
 843                                         ARCH_LOW_ADDRESS_LIMIT);
 844 }
 845
 846 /**
 847  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 848  * @pgdat: node to allocate from
 849  * @size: size of the request in bytes
 850  * @align: alignment of the region
 851  * @goal: preferred starting address of the region
 852  *
 853  * The goal is dropped if it can not be satisfied and the allocation will
 854  * fall back to memory below @goal.
 855  *
 856  * Allocation may fall back to any node in the system if the specified node
 857  * can not hold the requested memory.
 858  *
 859  * The function panics if the request can not be satisfied.
 860  */
 861 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 862                                        unsigned long align, unsigned long goal)
 863 {
 864         if (WARN_ON_ONCE(slab_is_available()))
 865                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 866
 867         return ___alloc_bootmem_node(pgdat, size, align,
 868                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 869 }