linux/mm/bootmem.c
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   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
  27struct pglist_data __refdata contig_page_data = {
  28        .bdata = &bootmem_node_data[0]
  29};
  30EXPORT_SYMBOL(contig_page_data);
  31#endif
  32
  33unsigned long max_low_pfn;
  34unsigned long min_low_pfn;
  35unsigned long max_pfn;
  36
  37bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
  38
  39static struct list_head bdata_list __initdata = LIST_HEAD_INIT(bdata_list);
  40
  41static int bootmem_debug;
  42
  43static int __init bootmem_debug_setup(char *buf)
  44{
  45        bootmem_debug = 1;
  46        return 0;
  47}
  48early_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
  57static 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 */
  68unsigned 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 */
  78static 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 */
  95static 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 */
 128unsigned 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 */
 141unsigned 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 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 */
 157void __init free_bootmem_late(unsigned long addr, unsigned long size)
 158{
 159        unsigned long cursor, end;
 160
 161        kmemleak_free_part(__va(addr), size);
 162
 163        cursor = PFN_UP(addr);
 164        end = PFN_DOWN(addr + size);
 165
 166        for (; cursor < end; cursor++) {
 167                __free_pages_bootmem(pfn_to_page(cursor), 0);
 168                totalram_pages++;
 169        }
 170}
 171
 172static 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
 189                map = bdata->node_bootmem_map;
 190                idx = start - bdata->node_min_pfn;
 191                vec = ~map[idx / BITS_PER_LONG];
 192                /*
 193                 * If we have a properly aligned and fully unreserved
 194                 * BITS_PER_LONG block of pages in front of us, free
 195                 * it in one go.
 196                 */
 197                if (IS_ALIGNED(start, BITS_PER_LONG) && vec == ~0UL) {
 198                        int order = ilog2(BITS_PER_LONG);
 199
 200                        __free_pages_bootmem(pfn_to_page(start), order);
 201                        count += BITS_PER_LONG;
 202                        start += BITS_PER_LONG;
 203                } else {
 204                        unsigned long off = 0;
 205
 206                        vec >>= start & (BITS_PER_LONG - 1);
 207                        while (vec) {
 208                                if (vec & 1) {
 209                                        page = pfn_to_page(start + off);
 210                                        __free_pages_bootmem(page, 0);
 211                                        count++;
 212                                }
 213                                vec >>= 1;
 214                                off++;
 215                        }
 216                        start = ALIGN(start + 1, BITS_PER_LONG);
 217                }
 218        }
 219
 220        page = virt_to_page(bdata->node_bootmem_map);
 221        pages = bdata->node_low_pfn - bdata->node_min_pfn;
 222        pages = bootmem_bootmap_pages(pages);
 223        count += pages;
 224        while (pages--)
 225                __free_pages_bootmem(page++, 0);
 226
 227        bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
 228
 229        return count;
 230}
 231
 232/**
 233 * free_all_bootmem_node - release a node's free pages to the buddy allocator
 234 * @pgdat: node to be released
 235 *
 236 * Returns the number of pages actually released.
 237 */
 238unsigned long __init free_all_bootmem_node(pg_data_t *pgdat)
 239{
 240        register_page_bootmem_info_node(pgdat);
 241        return free_all_bootmem_core(pgdat->bdata);
 242}
 243
 244/**
 245 * free_all_bootmem - release free pages to the buddy allocator
 246 *
 247 * Returns the number of pages actually released.
 248 */
 249unsigned long __init free_all_bootmem(void)
 250{
 251        unsigned long total_pages = 0;
 252        bootmem_data_t *bdata;
 253
 254        list_for_each_entry(bdata, &bdata_list, list)
 255                total_pages += free_all_bootmem_core(bdata);
 256
 257        return total_pages;
 258}
 259
 260static void __init __free(bootmem_data_t *bdata,
 261                        unsigned long sidx, unsigned long eidx)
 262{
 263        unsigned long idx;
 264
 265        bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
 266                sidx + bdata->node_min_pfn,
 267                eidx + bdata->node_min_pfn);
 268
 269        if (bdata->hint_idx > sidx)
 270                bdata->hint_idx = sidx;
 271
 272        for (idx = sidx; idx < eidx; idx++)
 273                if (!test_and_clear_bit(idx, bdata->node_bootmem_map))
 274                        BUG();
 275}
 276
 277static int __init __reserve(bootmem_data_t *bdata, unsigned long sidx,
 278                        unsigned long eidx, int flags)
 279{
 280        unsigned long idx;
 281        int exclusive = flags & BOOTMEM_EXCLUSIVE;
 282
 283        bdebug("nid=%td start=%lx end=%lx flags=%x\n",
 284                bdata - bootmem_node_data,
 285                sidx + bdata->node_min_pfn,
 286                eidx + bdata->node_min_pfn,
 287                flags);
 288
 289        for (idx = sidx; idx < eidx; idx++)
 290                if (test_and_set_bit(idx, bdata->node_bootmem_map)) {
 291                        if (exclusive) {
 292                                __free(bdata, sidx, idx);
 293                                return -EBUSY;
 294                        }
 295                        bdebug("silent double reserve of PFN %lx\n",
 296                                idx + bdata->node_min_pfn);
 297                }
 298        return 0;
 299}
 300
 301static int __init mark_bootmem_node(bootmem_data_t *bdata,
 302                                unsigned long start, unsigned long end,
 303                                int reserve, int flags)
 304{
 305        unsigned long sidx, eidx;
 306
 307        bdebug("nid=%td start=%lx end=%lx reserve=%d flags=%x\n",
 308                bdata - bootmem_node_data, start, end, reserve, flags);
 309
 310        BUG_ON(start < bdata->node_min_pfn);
 311        BUG_ON(end > bdata->node_low_pfn);
 312
 313        sidx = start - bdata->node_min_pfn;
 314        eidx = end - bdata->node_min_pfn;
 315
 316        if (reserve)
 317                return __reserve(bdata, sidx, eidx, flags);
 318        else
 319                __free(bdata, sidx, eidx);
 320        return 0;
 321}
 322
 323static int __init mark_bootmem(unsigned long start, unsigned long end,
 324                                int reserve, int flags)
 325{
 326        unsigned long pos;
 327        bootmem_data_t *bdata;
 328
 329        pos = start;
 330        list_for_each_entry(bdata, &bdata_list, list) {
 331                int err;
 332                unsigned long max;
 333
 334                if (pos < bdata->node_min_pfn ||
 335                    pos >= bdata->node_low_pfn) {
 336                        BUG_ON(pos != start);
 337                        continue;
 338                }
 339
 340                max = min(bdata->node_low_pfn, end);
 341
 342                err = mark_bootmem_node(bdata, pos, max, reserve, flags);
 343                if (reserve && err) {
 344                        mark_bootmem(start, pos, 0, 0);
 345                        return err;
 346                }
 347
 348                if (max == end)
 349                        return 0;
 350                pos = bdata->node_low_pfn;
 351        }
 352        BUG();
 353}
 354
 355/**
 356 * free_bootmem_node - mark a page range as usable
 357 * @pgdat: node the range resides on
 358 * @physaddr: starting address of the range
 359 * @size: size of the range in bytes
 360 *
 361 * Partial pages will be considered reserved and left as they are.
 362 *
 363 * The range must reside completely on the specified node.
 364 */
 365void __init free_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 366                              unsigned long size)
 367{
 368        unsigned long start, end;
 369
 370        kmemleak_free_part(__va(physaddr), size);
 371
 372        start = PFN_UP(physaddr);
 373        end = PFN_DOWN(physaddr + size);
 374
 375        mark_bootmem_node(pgdat->bdata, start, end, 0, 0);
 376}
 377
 378/**
 379 * free_bootmem - mark a page range as usable
 380 * @addr: starting address of the range
 381 * @size: size of the range in bytes
 382 *
 383 * Partial pages will be considered reserved and left as they are.
 384 *
 385 * The range must be contiguous but may span node boundaries.
 386 */
 387void __init free_bootmem(unsigned long addr, unsigned long size)
 388{
 389        unsigned long start, end;
 390
 391        kmemleak_free_part(__va(addr), size);
 392
 393        start = PFN_UP(addr);
 394        end = PFN_DOWN(addr + size);
 395
 396        mark_bootmem(start, end, 0, 0);
 397}
 398
 399/**
 400 * reserve_bootmem_node - mark a page range as reserved
 401 * @pgdat: node the range resides on
 402 * @physaddr: starting address of the range
 403 * @size: size of the range in bytes
 404 * @flags: reservation flags (see linux/bootmem.h)
 405 *
 406 * Partial pages will be reserved.
 407 *
 408 * The range must reside completely on the specified node.
 409 */
 410int __init reserve_bootmem_node(pg_data_t *pgdat, unsigned long physaddr,
 411                                 unsigned long size, int flags)
 412{
 413        unsigned long start, end;
 414
 415        start = PFN_DOWN(physaddr);
 416        end = PFN_UP(physaddr + size);
 417
 418        return mark_bootmem_node(pgdat->bdata, start, end, 1, flags);
 419}
 420
 421/**
 422 * reserve_bootmem - mark a page range as reserved
 423 * @addr: starting address of the range
 424 * @size: size of the range in bytes
 425 * @flags: reservation flags (see linux/bootmem.h)
 426 *
 427 * Partial pages will be reserved.
 428 *
 429 * The range must be contiguous but may span node boundaries.
 430 */
 431int __init reserve_bootmem(unsigned long addr, unsigned long size,
 432                            int flags)
 433{
 434        unsigned long start, end;
 435
 436        start = PFN_DOWN(addr);
 437        end = PFN_UP(addr + size);
 438
 439        return mark_bootmem(start, end, 1, flags);
 440}
 441
 442int __weak __init reserve_bootmem_generic(unsigned long phys, unsigned long len,
 443                                   int flags)
 444{
 445        return reserve_bootmem(phys, len, flags);
 446}
 447
 448static unsigned long __init align_idx(struct bootmem_data *bdata,
 449                                      unsigned long idx, unsigned long step)
 450{
 451        unsigned long base = bdata->node_min_pfn;
 452
 453        /*
 454         * Align the index with respect to the node start so that the
 455         * combination of both satisfies the requested alignment.
 456         */
 457
 458        return ALIGN(base + idx, step) - base;
 459}
 460
 461static unsigned long __init align_off(struct bootmem_data *bdata,
 462                                      unsigned long off, unsigned long align)
 463{
 464        unsigned long base = PFN_PHYS(bdata->node_min_pfn);
 465
 466        /* Same as align_idx for byte offsets */
 467
 468        return ALIGN(base + off, align) - base;
 469}
 470
 471static void * __init alloc_bootmem_bdata(struct bootmem_data *bdata,
 472                                        unsigned long size, unsigned long align,
 473                                        unsigned long goal, unsigned long limit)
 474{
 475        unsigned long fallback = 0;
 476        unsigned long min, max, start, sidx, midx, step;
 477
 478        bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
 479                bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
 480                align, goal, limit);
 481
 482        BUG_ON(!size);
 483        BUG_ON(align & (align - 1));
 484        BUG_ON(limit && goal + size > limit);
 485
 486        if (!bdata->node_bootmem_map)
 487                return NULL;
 488
 489        min = bdata->node_min_pfn;
 490        max = bdata->node_low_pfn;
 491
 492        goal >>= PAGE_SHIFT;
 493        limit >>= PAGE_SHIFT;
 494
 495        if (limit && max > limit)
 496                max = limit;
 497        if (max <= min)
 498                return NULL;
 499
 500        step = max(align >> PAGE_SHIFT, 1UL);
 501
 502        if (goal && min < goal && goal < max)
 503                start = ALIGN(goal, step);
 504        else
 505                start = ALIGN(min, step);
 506
 507        sidx = start - bdata->node_min_pfn;
 508        midx = max - bdata->node_min_pfn;
 509
 510        if (bdata->hint_idx > sidx) {
 511                /*
 512                 * Handle the valid case of sidx being zero and still
 513                 * catch the fallback below.
 514                 */
 515                fallback = sidx + 1;
 516                sidx = align_idx(bdata, bdata->hint_idx, step);
 517        }
 518
 519        while (1) {
 520                int merge;
 521                void *region;
 522                unsigned long eidx, i, start_off, end_off;
 523find_block:
 524                sidx = find_next_zero_bit(bdata->node_bootmem_map, midx, sidx);
 525                sidx = align_idx(bdata, sidx, step);
 526                eidx = sidx + PFN_UP(size);
 527
 528                if (sidx >= midx || eidx > midx)
 529                        break;
 530
 531                for (i = sidx; i < eidx; i++)
 532                        if (test_bit(i, bdata->node_bootmem_map)) {
 533                                sidx = align_idx(bdata, i, step);
 534                                if (sidx == i)
 535                                        sidx += step;
 536                                goto find_block;
 537                        }
 538
 539                if (bdata->last_end_off & (PAGE_SIZE - 1) &&
 540                                PFN_DOWN(bdata->last_end_off) + 1 == sidx)
 541                        start_off = align_off(bdata, bdata->last_end_off, align);
 542                else
 543                        start_off = PFN_PHYS(sidx);
 544
 545                merge = PFN_DOWN(start_off) < sidx;
 546                end_off = start_off + size;
 547
 548                bdata->last_end_off = end_off;
 549                bdata->hint_idx = PFN_UP(end_off);
 550
 551                /*
 552                 * Reserve the area now:
 553                 */
 554                if (__reserve(bdata, PFN_DOWN(start_off) + merge,
 555                                PFN_UP(end_off), BOOTMEM_EXCLUSIVE))
 556                        BUG();
 557
 558                region = phys_to_virt(PFN_PHYS(bdata->node_min_pfn) +
 559                                start_off);
 560                memset(region, 0, size);
 561                /*
 562                 * The min_count is set to 0 so that bootmem allocated blocks
 563                 * are never reported as leaks.
 564                 */
 565                kmemleak_alloc(region, size, 0, 0);
 566                return region;
 567        }
 568
 569        if (fallback) {
 570                sidx = align_idx(bdata, fallback - 1, step);
 571                fallback = 0;
 572                goto find_block;
 573        }
 574
 575        return NULL;
 576}
 577
 578static void * __init alloc_arch_preferred_bootmem(bootmem_data_t *bdata,
 579                                        unsigned long size, unsigned long align,
 580                                        unsigned long goal, unsigned long limit)
 581{
 582        if (WARN_ON_ONCE(slab_is_available()))
 583                return kzalloc(size, GFP_NOWAIT);
 584
 585#ifdef CONFIG_HAVE_ARCH_BOOTMEM
 586        {
 587                bootmem_data_t *p_bdata;
 588
 589                p_bdata = bootmem_arch_preferred_node(bdata, size, align,
 590                                                        goal, limit);
 591                if (p_bdata)
 592                        return alloc_bootmem_bdata(p_bdata, size, align,
 593                                                        goal, limit);
 594        }
 595#endif
 596        return NULL;
 597}
 598
 599static void * __init alloc_bootmem_core(unsigned long size,
 600                                        unsigned long align,
 601                                        unsigned long goal,
 602                                        unsigned long limit)
 603{
 604        bootmem_data_t *bdata;
 605        void *region;
 606
 607        region = alloc_arch_preferred_bootmem(NULL, size, align, goal, limit);
 608        if (region)
 609                return region;
 610
 611        list_for_each_entry(bdata, &bdata_list, list) {
 612                if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
 613                        continue;
 614                if (limit && bdata->node_min_pfn >= PFN_DOWN(limit))
 615                        break;
 616
 617                region = alloc_bootmem_bdata(bdata, size, align, goal, limit);
 618                if (region)
 619                        return region;
 620        }
 621
 622        return NULL;
 623}
 624
 625static void * __init ___alloc_bootmem_nopanic(unsigned long size,
 626                                              unsigned long align,
 627                                              unsigned long goal,
 628                                              unsigned long limit)
 629{
 630        void *ptr;
 631
 632restart:
 633        ptr = alloc_bootmem_core(size, align, goal, limit);
 634        if (ptr)
 635                return ptr;
 636        if (goal) {
 637                goal = 0;
 638                goto restart;
 639        }
 640
 641        return NULL;
 642}
 643
 644/**
 645 * __alloc_bootmem_nopanic - allocate boot memory without panicking
 646 * @size: size of the request in bytes
 647 * @align: alignment of the region
 648 * @goal: preferred starting address of the region
 649 *
 650 * The goal is dropped if it can not be satisfied and the allocation will
 651 * fall back to memory below @goal.
 652 *
 653 * Allocation may happen on any node in the system.
 654 *
 655 * Returns NULL on failure.
 656 */
 657void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
 658                                        unsigned long goal)
 659{
 660        unsigned long limit = 0;
 661
 662        return ___alloc_bootmem_nopanic(size, align, goal, limit);
 663}
 664
 665static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
 666                                        unsigned long goal, unsigned long limit)
 667{
 668        void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
 669
 670        if (mem)
 671                return mem;
 672        /*
 673         * Whoops, we cannot satisfy the allocation request.
 674         */
 675        printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 676        panic("Out of memory");
 677        return NULL;
 678}
 679
 680/**
 681 * __alloc_bootmem - allocate boot memory
 682 * @size: size of the request in bytes
 683 * @align: alignment of the region
 684 * @goal: preferred starting address of the region
 685 *
 686 * The goal is dropped if it can not be satisfied and the allocation will
 687 * fall back to memory below @goal.
 688 *
 689 * Allocation may happen on any node in the system.
 690 *
 691 * The function panics if the request can not be satisfied.
 692 */
 693void * __init __alloc_bootmem(unsigned long size, unsigned long align,
 694                              unsigned long goal)
 695{
 696        unsigned long limit = 0;
 697
 698        return ___alloc_bootmem(size, align, goal, limit);
 699}
 700
 701void * __init ___alloc_bootmem_node_nopanic(pg_data_t *pgdat,
 702                                unsigned long size, unsigned long align,
 703                                unsigned long goal, unsigned long limit)
 704{
 705        void *ptr;
 706
 707again:
 708        ptr = alloc_arch_preferred_bootmem(pgdat->bdata, size,
 709                                           align, goal, limit);
 710        if (ptr)
 711                return ptr;
 712
 713        /* do not panic in alloc_bootmem_bdata() */
 714        if (limit && goal + size > limit)
 715                limit = 0;
 716
 717        ptr = alloc_bootmem_bdata(pgdat->bdata, size, align, goal, limit);
 718        if (ptr)
 719                return ptr;
 720
 721        ptr = alloc_bootmem_core(size, align, goal, limit);
 722        if (ptr)
 723                return ptr;
 724
 725        if (goal) {
 726                goal = 0;
 727                goto again;
 728        }
 729
 730        return NULL;
 731}
 732
 733void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
 734                                   unsigned long align, unsigned long goal)
 735{
 736        if (WARN_ON_ONCE(slab_is_available()))
 737                return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 738
 739        return ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 740}
 741
 742void * __init ___alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 743                                    unsigned long align, unsigned long goal,
 744                                    unsigned long limit)
 745{
 746        void *ptr;
 747
 748        ptr = ___alloc_bootmem_node_nopanic(pgdat, size, align, goal, 0);
 749        if (ptr)
 750                return ptr;
 751
 752        printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
 753        panic("Out of memory");
 754        return NULL;
 755}
 756
 757/**
 758 * __alloc_bootmem_node - allocate boot memory from a specific node
 759 * @pgdat: node to allocate from
 760 * @size: size of the request in bytes
 761 * @align: alignment of the region
 762 * @goal: preferred starting address of the region
 763 *
 764 * The goal is dropped if it can not be satisfied and the allocation will
 765 * fall back to memory below @goal.
 766 *
 767 * Allocation may fall back to any node in the system if the specified node
 768 * can not hold the requested memory.
 769 *
 770 * The function panics if the request can not be satisfied.
 771 */
 772void * __init __alloc_bootmem_node(pg_data_t *pgdat, unsigned long size,
 773                                   unsigned long align, unsigned long goal)
 774{
 775        if (WARN_ON_ONCE(slab_is_available()))
 776                return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 777
 778        return  ___alloc_bootmem_node(pgdat, size, align, goal, 0);
 779}
 780
 781void * __init __alloc_bootmem_node_high(pg_data_t *pgdat, unsigned long size,
 782                                   unsigned long align, unsigned long goal)
 783{
 784#ifdef MAX_DMA32_PFN
 785        unsigned long end_pfn;
 786
 787        if (WARN_ON_ONCE(slab_is_available()))
 788                return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 789
 790        /* update goal according ...MAX_DMA32_PFN */
 791        end_pfn = pgdat->node_start_pfn + pgdat->node_spanned_pages;
 792
 793        if (end_pfn > MAX_DMA32_PFN + (128 >> (20 - PAGE_SHIFT)) &&
 794            (goal >> PAGE_SHIFT) < MAX_DMA32_PFN) {
 795                void *ptr;
 796                unsigned long new_goal;
 797
 798                new_goal = MAX_DMA32_PFN << PAGE_SHIFT;
 799                ptr = alloc_bootmem_bdata(pgdat->bdata, size, align,
 800                                                 new_goal, 0);
 801                if (ptr)
 802                        return ptr;
 803        }
 804#endif
 805
 806        return __alloc_bootmem_node(pgdat, size, align, goal);
 807
 808}
 809
 810#ifndef ARCH_LOW_ADDRESS_LIMIT
 811#define ARCH_LOW_ADDRESS_LIMIT  0xffffffffUL
 812#endif
 813
 814/**
 815 * __alloc_bootmem_low - allocate low boot memory
 816 * @size: size of the request in bytes
 817 * @align: alignment of the region
 818 * @goal: preferred starting address of the region
 819 *
 820 * The goal is dropped if it can not be satisfied and the allocation will
 821 * fall back to memory below @goal.
 822 *
 823 * Allocation may happen on any node in the system.
 824 *
 825 * The function panics if the request can not be satisfied.
 826 */
 827void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
 828                                  unsigned long goal)
 829{
 830        return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
 831}
 832
 833/**
 834 * __alloc_bootmem_low_node - allocate low boot memory from a specific node
 835 * @pgdat: node to allocate from
 836 * @size: size of the request in bytes
 837 * @align: alignment of the region
 838 * @goal: preferred starting address of the region
 839 *
 840 * The goal is dropped if it can not be satisfied and the allocation will
 841 * fall back to memory below @goal.
 842 *
 843 * Allocation may fall back to any node in the system if the specified node
 844 * can not hold the requested memory.
 845 *
 846 * The function panics if the request can not be satisfied.
 847 */
 848void * __init __alloc_bootmem_low_node(pg_data_t *pgdat, unsigned long size,
 849                                       unsigned long align, unsigned long goal)
 850{
 851        if (WARN_ON_ONCE(slab_is_available()))
 852                return kzalloc_node(size, GFP_NOWAIT, pgdat->node_id);
 853
 854        return ___alloc_bootmem_node(pgdat, size, align,
 855                                     goal, ARCH_LOW_ADDRESS_LIMIT);
 856}
 857
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