mm/bootmem.c

   1 /*
   2  *  bootmem - A boot-time physical memory allocator and configurator
   3  *
   4  *  Copyright (C) 1999 Ingo Molnar
   5  *                1999 Kanoj Sarcar, SGI
   6  *                2008 Johannes Weiner
   7  *
   8  * Access to this subsystem has to be serialized externally (which is true
   9  * for the boot process anyway).
  10  */
  11 #include <linux/init.h>
  12 #include <linux/pfn.h>
  13 #include <linux/slab.h>
  14 #include <linux/bootmem.h>
  15 #include <linux/export.h>
  16 #include <linux/kmemleak.h>
  17 #include <linux/range.h>
  18 #include <linux/memblock.h>
  19
  20 #include <asm/bug.h>
  21 #include <asm/io.h>
  22 #include <asm/processor.h>
  23
  24 #include "internal.h"
  25
  26 #ifndef CONFIG_NEED_MULTIPLE_NODES
  27 struct pglist_data __refdata contig_page_data = {
  28         .bdata = &bootmem_node_data[0]
  29 };
  30 EXPORT_SYMBOL(contig_page_data);
  31 #endif
  32
  33 unsigned long max_low_pfn;
  34 unsigned long min_low_pfn;
  35 unsigned long max_pfn;
  36
  37 bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  38
  39 static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  40
  41 static int bootmem_debug;
  42
  43 static int __init bootmem_debug_setup(char *buf)
  44 {
  45         bootmem_debug = 1;
  46         return 0;
  47 }
  48 early_param("bootmem_debug", bootmem_debug_setup);
  49
  50 #define bdebug(fmt, args...) ({                         \
  51         if (unlikely(bootmem_debug))                    \
  52                 printk(KERN_INFO                        \
  53                         "bootmem::%s " fmt,             \
  54                         __func__, ## args);             \
  55 })
  56
  57 static unsigned long __init bootmap_bytes(unsigned long pages)
  58 {
  59         unsigned long bytes = DIV_ROUND_UP(pages, 8);
  60
  61         return ALIGN(bytes, sizeof(long));
  62 }
  63
  64 /**
  65  * bootmem_bootmap_pages - calculate bitmap size in pages
  66  * @pages: number of pages the bitmap has to represent
  67  */
  68 unsigned long __init bootmem_bootmap_pages(unsigned long pages)
  69 {
  70         unsigned long bytes = bootmap_bytes(pages);
  71
  72         return PAGE_ALIGN(bytes) >> PAGE_SHIFT;
  73 }
  74
  75 /*
  76  * link bdata in order
  77  */
  78 static void __init link_bootmem(bootmem_data_t *bdata)
  79 {
  80         bootmem_data_t *ent;
  81
  82         list_for_each_entry(ent, &bdata_list, list) {
  83                 if (bdata->node_min_pfn < ent->node_min_pfn) {
  84                         list_add_tail(&bdata->list, &ent->list);
  85                         return;
  86                 }
  87         }
  88
  89         list_add_tail(&bdata->list, &bdata_list);
  90 }
  91
  92 /*
  93  * Called once to set up the allocator itself.
  94  */
  95 static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
  96         unsigned long mapstart, unsigned long start, unsigned long end)
  97 {
  98         unsigned long mapsize;
  99
 100         mminit_validate_memmodel_limits(&start, &end);
 101         bdata->node_bootmem_map = phys_to_virt(PFN_PHYS(mapstart));
 102         bdata->node_min_pfn = start;
 103         bdata->node_low_pfn = end;
 104         link_bootmem(bdata);
 105
 106         /*
 107          * Initially all pages are reserved - setup_arch() has to
 108          * register free RAM areas explicitly.
 109          */
 110         mapsize = bootmap_bytes(end - start);
 111         memset(bdata->node_bootmem_map, 0xff, mapsize);
 112
 113         bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
 114                 bdata - bootmem_node_data, start, mapstart, end, mapsize);
 115
 116         return mapsize;
 117 }
 118
 119 /**
 120  * init_bootmem_node - register a node as boot memory
 121  * @pgdat: node to register
 122  * @freepfn: pfn where the bitmap for this node is to be placed
 123  * @startpfn: first pfn on the node
 124  * @endpfn: first pfn after the node
 125  *
 126  * Returns the number of bytes needed to hold the bitmap for this node.
 127  */
 128 unsigned long __init init_bootmem_node(pg_data_t *pgdat, unsigned long freepfn,
 129                                 unsigned long startpfn, unsigned long endpfn)
 130 {
 131         return init_bootmem_core(pgdat->bdata, freepfn, startpfn, endpfn);
 132 }
 133
 134 /**
 135  * init_bootmem - register boot memory
 136  * @start: pfn where the bitmap is to be placed
 137  * @pages: number of available physical pages
 138  *
 139  * Returns the number of bytes needed to hold the bitmap.
 140  */
 141 unsigned long __init init_bootmem(unsigned long start, unsigned long pages)
 142 {
 143         max_low_pfn = pages;
 144         min_low_pfn = start;
 145         return init_bootmem_core(NODE_DATA(0)->bdata, start, 0, pages);
 146 }
 147
 148 /*
 149  * free_bootmem_late - free bootmem pages directly to page allocator
 150  * @addr: starting physical address of the range
 151  * @size: size of the range in bytes
 152  *
 153  * This is only useful when the bootmem allocator has already been torn
 154  * down, but we are still initializing the system.  Pages are given directly
 155  * to the page allocator, no bootmem metadata is updated because it is gone.
 156  */
 157 void __init free_bootmem_late(unsigned long physaddr, unsigned long size)
 158 {
 159         unsigned long cursor, end;
 160
 161         kmemleak_free_part(__va(physaddr), size);
 162
 163         cursor = PFN_UP(physaddr);
 164         end = PFN_DOWN(physaddr + size);
 165
 166         for (; cursor < end; cursor++) {
 167                 __free_pages_bootmem(pfn_to_page(cursor), 0);
 168                 totalram_pages++;
 169         }
 170 }
 171
 172 static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
 173 {
 174         struct page *page;
 175         unsigned long start, end, pages, count = 0;
 176
 177         if (!bdata->node_bootmem_map)
 178                 return 0;
 179
 180         start = bdata->node_min_pfn;
 181         end = bdata->node_low_pfn;
 182
 183         bdebug("nid=%td start=%lx end=%lx\n",
 184                 bdata - bootmem_node_data, start, end);
 185
 186         while (start < end) {
 187                 unsigned long *map, idx, vec;
 188                 unsigned shift;
 189
 190                 map = bdata->node_bootmem_map;
 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 void reset_node_lowmem_managed_pages(pg_data_t *pgdat)
 245 {
 246         struct zone *z;
 247
 248         /*
 249          * In free_area_init_core(), highmem zone's managed_pages is set to
 250          * present_pages, and bootmem allocator doesn't allocate from highmem
 251          * zones. So there's no need to recalculate managed_pages because all
 252          * highmem pages will be managed by the buddy system. Here highmem
 253          * zone also includes highmem movable zone.
 254          */
 255         for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
 256                 if (!is_highmem(z))
 257                         z->managed_pages = 0;
 258 }
 259
 260 /**
 261  * free_all_bootmem_node - release a node's free pages to the buddy allocator
 262  * @pgdat: node to be released
 263  *
 264  * Returns the number of pages actually released.
 265  */
 266 unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 267 {
 268         register_page_bootmem_info_node(pgdat);
 269         reset_node_lowmem_managed_pages(pgdat);
 270         return free_all_bootmem_core(pgdat->bdata);
 271 }
 272
 273 /**
 274  * free_all_bootmem - release free pages to the buddy allocator
 275  *
 276  * Returns the number of pages actually released.
 277  */
 278 unsigned long __init free_all_bootmem(void)
 279 {
 280         unsigned long total_pages = 0;
 281         bootmem_data_t *bdata;
 282         struct pglist_data *pgdat;
 283
 284         for_each_online_pgdat(pgdat)
 285                 reset_node_lowmem_managed_pages(pgdat);
 286
 287         list_for_each_entry(bdata, &bdata_list, list)
 288                 total_pages += free_all_bootmem_core(bdata);
 289
 290         return total_pages;
 291 }
 292
 293 static void __init __free(bootmem_data_t *bdata,
 294                         unsigned long sidx, unsigned long eidx)
 295 {
 296         unsigned long idx;
 297
 298         bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 299                 sidx + bdata->node_min_pfn,
 300                 eidx + bdata->node_min_pfn);
 301
 302         if (bdata->hint_idx > sidx)
 303                 bdata->hint_idx = sidx;
 304
 305         for (idx = sidx; idx < eidx; idx++)
 306                 if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 307                         BUG();
 308 }
 309
 310 static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 311                         unsigned long eidx, int flags)
 312 {
 313         unsigned long idx;
 314         int exclusive = flags & BOOTMEM_EXCLUSIVE;
 315
 316         bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 317                 bdata - bootmem_node_data,
 318                 sidx + bdata->node_min_pfn,
 319                 eidx + bdata->node_min_pfn,
 320                 flags);
 321
 322         for (idx = sidx; idx < eidx; idx++)
 323                 if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 324                         if (exclusive) {
 325                                 __free(bdata, sidx, idx);
 326                                 return -EBUSY;
 327                         }
 328                         bdebug("silent double reserve of PFN %lx\n",
 329                                 idx + bdata->node_min_pfn);
 330                 }
 331         return 0;
 332 }
 333
 334 static int __init mark_bootmem_node(bootmem_data_t *bdata,
 335                                 unsigned long start, unsigned long end,
 336                                 int reserve, int flags)
 337 {
 338         unsigned long sidx, eidx;
 339
 340         bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 341                 bdata - bootmem_node_data, start, end, reserve, flags);
 342
 343         BUG_ON(start < bdata->node_min_pfn);
 344         BUG_ON(end > bdata->node_low_pfn);
 345
 346         sidx = start - bdata->node_min_pfn;
 347         eidx = end - bdata->node_min_pfn;
 348
 349         if (reserve)
 350                 return __reserve(bdata, sidx, eidx, flags);
 351         else
 352                 __free(bdata, sidx, eidx);
 353         return 0;
 354 }
 355
 356 static int __init mark_bootmem(unsigned long start, unsigned long end,
 357                                 int reserve, int flags)
 358 {
 359         unsigned long pos;
 360         bootmem_data_t *bdata;
 361
 362         pos = start;
 363         list_for_each_entry(bdata, &bdata_list, list) {
 364                 int err;
 365                 unsigned long max;
 366
 367                 if (pos < bdata->node_min_pfn ||
 368                     pos >= bdata->node_low_pfn) {
 369                         BUG_ON(pos != start);
 370                         continue;
 371                 }
 372
 373                 max = min(bdata->node_low_pfn, end);
 374
 375                 err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 376                 if (reserve && err) {
 377                         mark_bootmem(start, pos, 0, 0);
 378                         return err;
 379                 }
 380
 381                 if (max == end)
 382                         return 0;
 383                 pos = bdata->node_low_pfn;
 384         }
 385         BUG();
 386 }
 387
 388 /**
 389  * free_bootmem_node - mark a page range as usable
 390  * @pgdat: node the range resides on
 391  * @physaddr: starting address of the range
 392  * @size: size of the range in bytes
 393  *
 394  * Partial pages will be considered reserved and left as they are.
 395  *
 396  * The range must reside completely on the specified node.
 397  */
 398 void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 399                               unsigned long size)
 400 {
 401         unsigned long start, end;
 402
 403         kmemleak_free_part(__va(physaddr), size);
 404
 405         start = PFN_UP(physaddr);
 406         end = PFN_DOWN(physaddr + size);
 407
 408         mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 409 }
 410
 411 /**
 412  * free_bootmem - mark a page range as usable
 413  * @addr: starting physical address of the range
 414  * @size: size of the range in bytes
 415  *
 416  * Partial pages will be considered reserved and left as they are.
 417  *
 418  * The range must be contiguous but may span node boundaries.
 419  */
 420 void __init free_bootmem(unsigned long physaddr, unsigned long size)
 421 {
 422         unsigned long start, end;
 423
 424         kmemleak_free_part(__va(physaddr), size);
 425
 426         start = PFN_UP(physaddr);
 427         end = PFN_DOWN(physaddr + size);
 428
 429         mark_bootmem(start, end, 0, 0);
 430 }
 431
 432 /**
 433  * reserve_bootmem_node - mark a page range as reserved
 434  * @pgdat: node the range resides on
 435  * @physaddr: starting address of the range
 436  * @size: size of the range in bytes
 437  * @flags: reservation flags (see linux/bootmem.h)
 438  *
 439  * Partial pages will be reserved.
 440  *
 441  * The range must reside completely on the specified node.
 442  */
 443 int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 444                                  unsigned long size, int flags)
 445 {
 446         unsigned long start, end;
 447
 448         start = PFN_DOWN(physaddr);
 449         end = PFN_UP(physaddr + size);
 450
 451         return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 452 }
 453
 454 /**
 455  * reserve_bootmem - mark a page range as reserved
 456  * @addr: starting address of the range
 457  * @size: size of the range in bytes
 458  * @flags: reservation flags (see linux/bootmem.h)
 459  *
 460  * Partial pages will be reserved.
 461  *
 462  * The range must be contiguous but may span node boundaries.
 463  */
 464 int __init reserve_bootmem(unsigned long addr, unsigned long size,
 465                             int flags)
 466 {
 467         unsigned long start, end;
 468
 469         start = PFN_DOWN(addr);
 470         end = PFN_UP(addr + size);
 471
 472         return mark_bootmem(start, end, 1, flags);
 473 }
 474
 475 static unsigned long __init align_idx(struct bootmem_data *bdata,
 476                                       unsigned long idx, unsigned long step)
 477 {
 478         unsigned long base = bdata->node_min_pfn;
 479
 480         /*
 481          * Align the index with respect to the node start so that the
 482          * combination of both satisfies the requested alignment.
 483          */
 484
 485         return ALIGN(base + idx, step) - base;
 486 }
 487
 488 static unsigned long __init align_off(struct bootmem_data *bdata,
 489                                       unsigned long off, unsigned long align)
 490 {
 491         unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 492
 493         /* Same as align_idx for byte offsets */
 494
 495         return ALIGN(base + off, align) - base;
 496 }
 497
 498 static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 499                                         unsigned long size, unsigned long align,
 500                                         unsigned long goal, unsigned long limit)
 501 {
 502         unsigned long fallback = 0;
 503         unsigned long min, max, start, sidx, midx, step;
 504
 505         bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 506                 bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 507                 align, goal, limit);
 508
 509         BUG_ON(!size);
 510         BUG_ON(align & (align - 1));
 511         BUG_ON(limit && goal + size > limit);
 512
 513         if (!bdata->node_bootmem_map)
 514                 return NULL;
 515
 516         min = bdata->node_min_pfn;
 517         max = bdata->node_low_pfn;
 518
 519         goal >>= PAGE_SHIFT;
 520         limit >>= PAGE_SHIFT;
 521
 522         if (limit && max > limit)
 523                 max = limit;
 524         if (max <= min)
 525                 return NULL;
 526
 527         step = max(align >> PAGE_SHIFT, 1UL);
 528
 529         if (goal && min < goal && goal < max)
 530                 start = ALIGN(goal, step);
 531         else
 532                 start = ALIGN(min, step);
 533
 534         sidx = start - bdata->node_min_pfn;
 535         midx = max - bdata->node_min_pfn;
 536
 537         if (bdata->hint_idx > sidx) {
 538                 /*
 539                  * Handle the valid case of sidx being zero and still
 540                  * catch the fallback below.
 541                  */
 542                 fallback = sidx + 1;
 543                 sidx = align_idx(bdata, bdata->hint_idx, step);
 544         }
 545
 546         while (1) {
 547                 int merge;
 548                 void *region;
 549                 unsigned long eidx, i, start_off, end_off;
 550 find_block:
 551                 sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 552                 sidx = align_idx(bdata, sidx, step);
 553                 eidx = sidx + PFN_UP(size);
 554
 555                 if (sidx >= midx || eidx > midx)
 556                         break;
 557
 558                 for (i = sidx; i < eidx; i++)
 559                         if (test_bit(i, bdata->node_bootmem_map)) {
 560                                 sidx = align_idx(bdata, i, step);
 561                                 if (sidx == i)
 562                                         sidx += step;
 563                                 goto find_block;
 564                         }
 565
 566                 if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 567                                 PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 568                         start_off = align_off(bdata, bdata->last_end_off, align);
 569                 else
 570                         start_off = PFN_PHYS(sidx);
 571
 572                 merge = PFN_DOWN(start_off) < sidx;
 573                 end_off = start_off + size;
 574
 575                 bdata->last_end_off = end_off;
 576                 bdata->hint_idx = PFN_UP(end_off);
 577
 578                 /*
 579                  * Reserve the area now:
 580                  */
 581                 if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 582                                 PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 583                         BUG();
 584
 585                 region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 586                                 start_off);
 587                 memset(region, 0, size);
 588                 /*
 589                  * The min_count is set to 0 so that bootmem allocated blocks
 590                  * are never reported as leaks.
 591                  */
 592                 kmemleak_alloc(region, size, 0, 0);
 593                 return region;
 594         }
 595
 596         if (fallback) {
 597                 sidx = align_idx(bdata, fallback - 1, step);
 598                 fallback = 0;
 599                 goto find_block;
 600         }
 601
 602         return NULL;
 603 }
 604
 605 static void * __init alloc_bootmem_core(unsigned long size,
 606                                         unsigned long align,
 607                                         unsigned long goal,
 608                                         unsigned long limit)
 609 {
 610         bootmem_data_t *bdata;
 611         void *region;
 612
 613         if (WARN_ON_ONCE(slab_is_available()))
 614                 return kzalloc(size, GFP_NOWAIT);
 615
 616         list_for_each_entry(bdata, &bdata_list, list) {
 617                 if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 618                         continue;
 619                 if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 620                         break;
 621
 622                 region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 623                 if (region)
 624                         return region;
 625         }
 626
 627         return NULL;
 628 }
 629
 630 static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 631                                               unsigned long align,
 632                                               unsigned long goal,
 633                                               unsigned long limit)
 634 {
 635         void *ptr;
 636
 637 restart:
 638         ptr = alloc_bootmem_core(size, align, goal, limit);
 639         if (ptr)
 640                 return ptr;
 641         if (goal) {
 642                 goal = 0;
 643                 goto restart;
 644         }
 645
 646         return NULL;
 647 }
 648
 649 /**
 650  * __alloc_bootmem_nopanic - allocate boot memory without panicking
 651  * @size: size of the request in bytes
 652  * @align: alignment of the region
 653  * @goal: preferred starting address of the region
 654  *
 655  * The goal is dropped if it can not be satisfied and the allocation will
 656  * fall back to memory below @goal.
 657  *
 658  * Allocation may happen on any node in the system.
 659  *
 660  * Returns NULL on failure.
 661  */
 662 void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 663                                         unsigned long goal)
 664 {
 665         unsigned long limit = 0;
 666
 667         return ___alloc_bootmem_nopanic(size, align, goal, limit);
 668 }
 669
 670 static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 671                                         unsigned long goal, unsigned long limit)
 672 {
 673         void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 674
 675         if (mem)
 676                 return mem;
 677         /*
 678          * Whoops, we cannot satisfy the allocation request.
 679          */
 680         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 681         panic("Out of memory");
 682         return NULL;
 683 }
 684
 685 /**
 686  * __alloc_bootmem - allocate boot memory
 687  * @size: size of the request in bytes
 688  * @align: alignment of the region
 689  * @goal: preferred starting address of the region
 690  *
 691  * The goal is dropped if it can not be satisfied and the allocation will
 692  * fall back to memory below @goal.
 693  *
 694  * Allocation may happen on any node in the system.
 695  *
 696  * The function panics if the request can not be satisfied.
 697  */
 698 void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 699                               unsigned long goal)
 700 {
 701         unsigned long limit = 0;
 702
 703         return ___alloc_bootmem(size, align, goal, limit);
 704 }
 705
 706 void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 707                                 unsigned long size, unsigned long align,
 708                                 unsigned long goal, unsigned long limit)
 709 {
 710         void *ptr;
 711
 712         if (WARN_ON_ONCE(slab_is_available()))
 713                 return kzalloc(size, GFP_NOWAIT);
 714 again:
 715
 716         /* do not panic in alloc_bootmem_bdata() */
 717         if (limit && goal + size > limit)
 718                 limit = 0;
 719
 720         ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 721         if (ptr)
 722                 return ptr;
 723
 724         ptr = alloc_bootmem_core(size, align, goal, limit);
 725         if (ptr)
 726                 return ptr;
 727
 728         if (goal) {
 729                 goal = 0;
 730                 goto again;
 731         }
 732
 733         return NULL;
 734 }
 735
 736 void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 737                                    unsigned long align, unsigned long goal)
 738 {
 739         if (WARN_ON_ONCE(slab_is_available()))
 740                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 741
 742         return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 743 }
 744
 745 void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 746                                     unsigned long align, unsigned long goal,
 747                                     unsigned long limit)
 748 {
 749         void *ptr;
 750
 751         ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 752         if (ptr)
 753                 return ptr;
 754
 755         printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 756         panic("Out of memory");
 757         return NULL;
 758 }
 759
 760 /**
 761  * __alloc_bootmem_node - allocate boot memory from a specific node
 762  * @pgdat: node to allocate from
 763  * @size: size of the request in bytes
 764  * @align: alignment of the region
 765  * @goal: preferred starting address of the region
 766  *
 767  * The goal is dropped if it can not be satisfied and the allocation will
 768  * fall back to memory below @goal.
 769  *
 770  * Allocation may fall back to any node in the system if the specified node
 771  * can not hold the requested memory.
 772  *
 773  * The function panics if the request can not be satisfied.
 774  */
 775 void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 776                                    unsigned long align, unsigned long goal)
 777 {
 778         if (WARN_ON_ONCE(slab_is_available()))
 779                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 780
 781         return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 782 }
 783
 784 void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 785                                    unsigned long align, unsigned long goal)
 786 {
 787 #ifdef MAX_DMA32_PFN
 788         unsigned long end_pfn;
 789
 790         if (WARN_ON_ONCE(slab_is_available()))
 791                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 792
 793         /* update goal according ...MAX_DMA32_PFN */
 794         end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 795
 796         if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 797             (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 798                 void *ptr;
 799                 unsigned long new_goal;
 800
 801                 new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 802                 ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 803                                                  new_goal, 0);
 804                 if (ptr)
 805                         return ptr;
 806         }
 807 #endif
 808
 809         return __alloc_bootmem_node(pgdat, size, align, goal);
 810
 811 }
 812
 813 #ifndef ARCH_LOW_ADDRESS_LIMIT
 814 #define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 815 #endif
 816
 817 /**
 818  * __alloc_bootmem_low - allocate low boot memory
 819  * @size: size of the request in bytes
 820  * @align: alignment of the region
 821  * @goal: preferred starting address of the region
 822  *
 823  * The goal is dropped if it can not be satisfied and the allocation will
 824  * fall back to memory below @goal.
 825  *
 826  * Allocation may happen on any node in the system.
 827  *
 828  * The function panics if the request can not be satisfied.
 829  */
 830 void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 831                                   unsigned long goal)
 832 {
 833         return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 834 }
 835
 836 void * __init __alloc_bootmem_low_nopanic(unsigned long size,
 837                                           unsigned long align,
 838                                           unsigned long goal)
 839 {
 840         return ___alloc_bootmem_nopanic(size, align, goal,
 841                                         ARCH_LOW_ADDRESS_LIMIT);
 842 }
 843
 844 /**
 845  * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 846  * @pgdat: node to allocate from
 847  * @size: size of the request in bytes
 848  * @align: alignment of the region
 849  * @goal: preferred starting address of the region
 850  *
 851  * The goal is dropped if it can not be satisfied and the allocation will
 852  * fall back to memory below @goal.
 853  *
 854  * Allocation may fall back to any node in the system if the specified node
 855  * can not hold the requested memory.
 856  *
 857  * The function panics if the request can not be satisfied.
 858  */
 859 void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 860                                        unsigned long align, unsigned long goal)
 861 {
 862         if (WARN_ON_ONCE(slab_is_available()))
 863                 return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 864
 865         return ___alloc_bootmem_node(pgdat, size, align,
 866                                      goal, ARCH_LOW_ADDRESS_LIMIT);
 867 }