arch/x86/mm/init_64.c

   1 /*
   2  *  linux/arch/x86_64/mm/init.c
   3  *
   4  *  Copyright (C) 1995  Linus Torvalds
   5  *  Copyright (C) 2000  Pavel Machek <pavel@ucw.cz>
   6  *  Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
   7  */
   8
   9 #include <linux/signal.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/errno.h>
  13 #include <linux/string.h>
  14 #include <linux/types.h>
  15 #include <linux/ptrace.h>
  16 #include <linux/mman.h>
  17 #include <linux/mm.h>
  18 #include <linux/swap.h>
  19 #include <linux/smp.h>
  20 #include <linux/init.h>
  21 #include <linux/initrd.h>
  22 #include <linux/pagemap.h>
  23 #include <linux/bootmem.h>
  24 #include <linux/memblock.h>
  25 #include <linux/proc_fs.h>
  26 #include <linux/pci.h>
  27 #include <linux/pfn.h>
  28 #include <linux/poison.h>
  29 #include <linux/dma-mapping.h>
  30 #include <linux/memory.h>
  31 #include <linux/memory_hotplug.h>
  32 #include <linux/memremap.h>
  33 #include <linux/nmi.h>
  34 #include <linux/gfp.h>
  35 #include <linux/kcore.h>
  36
  37 #include <asm/processor.h>
  38 #include <asm/bios_ebda.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/pgalloc.h>
  42 #include <asm/dma.h>
  43 #include <asm/fixmap.h>
  44 #include <asm/e820.h>
  45 #include <asm/apic.h>
  46 #include <asm/tlb.h>
  47 #include <asm/mmu_context.h>
  48 #include <asm/proto.h>
  49 #include <asm/smp.h>
  50 #include <asm/sections.h>
  51 #include <asm/kdebug.h>
  52 #include <asm/numa.h>
  53 #include <asm/cacheflush.h>
  54 #include <asm/init.h>
  55 #include <asm/uv/uv.h>
  56 #include <asm/setup.h>
  57
  58 #include "mm_internal.h"
  59
  60 #include "ident_map.c"
  61
  62 /*
  63  * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
  64  * physical space so we can cache the place of the first one and move
  65  * around without checking the pgd every time.
  66  */
  67
  68 pteval_t __supported_pte_mask __read_mostly = ~0;
  69 EXPORT_SYMBOL_GPL(__supported_pte_mask);
  70
  71 int force_personality32;
  72
  73 /*
  74  * noexec32=on|off
  75  * Control non executable heap for 32bit processes.
  76  * To control the stack too use noexec=off
  77  *
  78  * on   PROT_READ does not imply PROT_EXEC for 32-bit processes (default)
  79  * off  PROT_READ implies PROT_EXEC
  80  */
  81 static int __init nonx32_setup(char *str)
  82 {
  83         if (!strcmp(str, "on"))
  84                 force_personality32 &= ~READ_IMPLIES_EXEC;
  85         else if (!strcmp(str, "off"))
  86                 force_personality32 |= READ_IMPLIES_EXEC;
  87         return 1;
  88 }
  89 __setup("noexec32=", nonx32_setup);
  90
  91 /*
  92  * When memory was added/removed make sure all the processes MM have
  93  * suitable PGD entries in the local PGD level page.
  94  */
  95 void sync_global_pgds(unsigned long start, unsigned long end, int removed)
  96 {
  97         unsigned long addr;
  98
  99         for (addr = start; addr <= end; addr = ALIGN(addr + 1, PGDIR_SIZE)) {
 100                 const pgd_t *pgd_ref = pgd_offset_k(addr);
 101                 struct page *page;
 102
 103                 /*
 104                  * When it is called after memory hot remove, pgd_none()
 105                  * returns true. In this case (removed == 1), we must clear
 106                  * the PGD entries in the local PGD level page.
 107                  */
 108                 if (pgd_none(*pgd_ref) && !removed)
 109                         continue;
 110
 111                 spin_lock(&pgd_lock);
 112                 list_for_each_entry(page, &pgd_list, lru) {
 113                         pgd_t *pgd;
 114                         spinlock_t *pgt_lock;
 115
 116                         pgd = (pgd_t *)page_address(page) + pgd_index(addr);
 117                         /* the pgt_lock only for Xen */
 118                         pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
 119                         spin_lock(pgt_lock);
 120
 121                         if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
 122                                 BUG_ON(pgd_page_vaddr(*pgd)
 123                                        != pgd_page_vaddr(*pgd_ref));
 124
 125                         if (removed) {
 126                                 if (pgd_none(*pgd_ref) && !pgd_none(*pgd))
 127                                         pgd_clear(pgd);
 128                         } else {
 129                                 if (pgd_none(*pgd))
 130                                         set_pgd(pgd, *pgd_ref);
 131                         }
 132
 133                         spin_unlock(pgt_lock);
 134                 }
 135                 spin_unlock(&pgd_lock);
 136         }
 137 }
 138
 139 /*
 140  * NOTE: This function is marked __ref because it calls __init function
 141  * (alloc_bootmem_pages). It's safe to do it ONLY when after_bootmem == 0.
 142  */
 143 static __ref void *spp_getpage(void)
 144 {
 145         void *ptr;
 146
 147         if (after_bootmem)
 148                 ptr = (void *) get_zeroed_page(GFP_ATOMIC | __GFP_NOTRACK);
 149         else
 150                 ptr = alloc_bootmem_pages(PAGE_SIZE);
 151
 152         if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
 153                 panic("set_pte_phys: cannot allocate page data %s\n",
 154                         after_bootmem ? "after bootmem" : "");
 155         }
 156
 157         pr_debug("spp_getpage %p\n", ptr);
 158
 159         return ptr;
 160 }
 161
 162 static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
 163 {
 164         if (pgd_none(*pgd)) {
 165                 pud_t *pud = (pud_t *)spp_getpage();
 166                 pgd_populate(&init_mm, pgd, pud);
 167                 if (pud != pud_offset(pgd, 0))
 168                         printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
 169                                pud, pud_offset(pgd, 0));
 170         }
 171         return pud_offset(pgd, vaddr);
 172 }
 173
 174 static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
 175 {
 176         if (pud_none(*pud)) {
 177                 pmd_t *pmd = (pmd_t *) spp_getpage();
 178                 pud_populate(&init_mm, pud, pmd);
 179                 if (pmd != pmd_offset(pud, 0))
 180                         printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
 181                                pmd, pmd_offset(pud, 0));
 182         }
 183         return pmd_offset(pud, vaddr);
 184 }
 185
 186 static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
 187 {
 188         if (pmd_none(*pmd)) {
 189                 pte_t *pte = (pte_t *) spp_getpage();
 190                 pmd_populate_kernel(&init_mm, pmd, pte);
 191                 if (pte != pte_offset_kernel(pmd, 0))
 192                         printk(KERN_ERR "PAGETABLE BUG #02!\n");
 193         }
 194         return pte_offset_kernel(pmd, vaddr);
 195 }
 196
 197 void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
 198 {
 199         pud_t *pud;
 200         pmd_t *pmd;
 201         pte_t *pte;
 202
 203         pud = pud_page + pud_index(vaddr);
 204         pmd = fill_pmd(pud, vaddr);
 205         pte = fill_pte(pmd, vaddr);
 206
 207         set_pte(pte, new_pte);
 208
 209         /*
 210          * It's enough to flush this one mapping.
 211          * (PGE mappings get flushed as well)
 212          */
 213         __flush_tlb_one(vaddr);
 214 }
 215
 216 void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
 217 {
 218         pgd_t *pgd;
 219         pud_t *pud_page;
 220
 221         pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
 222
 223         pgd = pgd_offset_k(vaddr);
 224         if (pgd_none(*pgd)) {
 225                 printk(KERN_ERR
 226                         "PGD FIXMAP MISSING, it should be setup in head.S!\n");
 227                 return;
 228         }
 229         pud_page = (pud_t*)pgd_page_vaddr(*pgd);
 230         set_pte_vaddr_pud(pud_page, vaddr, pteval);
 231 }
 232
 233 pmd_t * __init populate_extra_pmd(unsigned long vaddr)
 234 {
 235         pgd_t *pgd;
 236         pud_t *pud;
 237
 238         pgd = pgd_offset_k(vaddr);
 239         pud = fill_pud(pgd, vaddr);
 240         return fill_pmd(pud, vaddr);
 241 }
 242
 243 pte_t * __init populate_extra_pte(unsigned long vaddr)
 244 {
 245         pmd_t *pmd;
 246
 247         pmd = populate_extra_pmd(vaddr);
 248         return fill_pte(pmd, vaddr);
 249 }
 250
 251 /*
 252  * Create large page table mappings for a range of physical addresses.
 253  */
 254 static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
 255                                         enum page_cache_mode cache)
 256 {
 257         pgd_t *pgd;
 258         pud_t *pud;
 259         pmd_t *pmd;
 260         pgprot_t prot;
 261
 262         pgprot_val(prot) = pgprot_val(PAGE_KERNEL_LARGE) |
 263                 pgprot_val(pgprot_4k_2_large(cachemode2pgprot(cache)));
 264         BUG_ON((phys & ~PMD_MASK) || (size & ~PMD_MASK));
 265         for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
 266                 pgd = pgd_offset_k((unsigned long)__va(phys));
 267                 if (pgd_none(*pgd)) {
 268                         pud = (pud_t *) spp_getpage();
 269                         set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
 270                                                 _PAGE_USER));
 271                 }
 272                 pud = pud_offset(pgd, (unsigned long)__va(phys));
 273                 if (pud_none(*pud)) {
 274                         pmd = (pmd_t *) spp_getpage();
 275                         set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
 276                                                 _PAGE_USER));
 277                 }
 278                 pmd = pmd_offset(pud, phys);
 279                 BUG_ON(!pmd_none(*pmd));
 280                 set_pmd(pmd, __pmd(phys | pgprot_val(prot)));
 281         }
 282 }
 283
 284 void __init init_extra_mapping_wb(unsigned long phys, unsigned long size)
 285 {
 286         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_WB);
 287 }
 288
 289 void __init init_extra_mapping_uc(unsigned long phys, unsigned long size)
 290 {
 291         __init_extra_mapping(phys, size, _PAGE_CACHE_MODE_UC);
 292 }
 293
 294 /*
 295  * The head.S code sets up the kernel high mapping:
 296  *
 297  *   from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
 298  *
 299  * phys_base holds the negative offset to the kernel, which is added
 300  * to the compile time generated pmds. This results in invalid pmds up
 301  * to the point where we hit the physaddr 0 mapping.
 302  *
 303  * We limit the mappings to the region from _text to _brk_end.  _brk_end
 304  * is rounded up to the 2MB boundary. This catches the invalid pmds as
 305  * well, as they are located before _text:
 306  */
 307 void __init cleanup_highmap(void)
 308 {
 309         unsigned long vaddr = __START_KERNEL_map;
 310         unsigned long vaddr_end = __START_KERNEL_map + KERNEL_IMAGE_SIZE;
 311         unsigned long end = roundup((unsigned long)_brk_end, PMD_SIZE) - 1;
 312         pmd_t *pmd = level2_kernel_pgt;
 313
 314         /*
 315          * Native path, max_pfn_mapped is not set yet.
 316          * Xen has valid max_pfn_mapped set in
 317          *      arch/x86/xen/mmu.c:xen_setup_kernel_pagetable().
 318          */
 319         if (max_pfn_mapped)
 320                 vaddr_end = __START_KERNEL_map + (max_pfn_mapped << PAGE_SHIFT);
 321
 322         for (; vaddr + PMD_SIZE - 1 < vaddr_end; pmd++, vaddr += PMD_SIZE) {
 323                 if (pmd_none(*pmd))
 324                         continue;
 325                 if (vaddr < (unsigned long) _text || vaddr > end)
 326                         set_pmd(pmd, __pmd(0));
 327                 else if (kaiser_enabled) {
 328                         /*
 329                          * level2_kernel_pgt is initialized with _PAGE_GLOBAL:
 330                          * clear that now.  This is not important, so long as
 331                          * CR4.PGE remains clear, but it removes an anomaly.
 332                          * Physical mapping setup below avoids _PAGE_GLOBAL
 333                          * by use of massage_pgprot() inside pfn_pte() etc.
 334                          */
 335                         set_pmd(pmd, pmd_clear_flags(*pmd, _PAGE_GLOBAL));
 336                 }
 337         }
 338 }
 339
 340 /*
 341  * Create PTE level page table mapping for physical addresses.
 342  * It returns the last physical address mapped.
 343  */
 344 static unsigned long __meminit
 345 phys_pte_init(pte_t *pte_page, unsigned long paddr, unsigned long paddr_end,
 346               pgprot_t prot)
 347 {
 348         unsigned long pages = 0, paddr_next;
 349         unsigned long paddr_last = paddr_end;
 350         pte_t *pte;
 351         int i;
 352
 353         pte = pte_page + pte_index(paddr);
 354         i = pte_index(paddr);
 355
 356         for (; i < PTRS_PER_PTE; i++, paddr = paddr_next, pte++) {
 357                 paddr_next = (paddr & PAGE_MASK) + PAGE_SIZE;
 358                 if (paddr >= paddr_end) {
 359                         if (!after_bootmem &&
 360                             !e820_any_mapped(paddr & PAGE_MASK, paddr_next,
 361                                              E820_RAM) &&
 362                             !e820_any_mapped(paddr & PAGE_MASK, paddr_next,
 363                                              E820_RESERVED_KERN))
 364                                 set_pte(pte, __pte(0));
 365                         continue;
 366                 }
 367
 368                 /*
 369                  * We will re-use the existing mapping.
 370                  * Xen for example has some special requirements, like mapping
 371                  * pagetable pages as RO. So assume someone who pre-setup
 372                  * these mappings are more intelligent.
 373                  */
 374                 if (!pte_none(*pte)) {
 375                         if (!after_bootmem)
 376                                 pages++;
 377                         continue;
 378                 }
 379
 380                 if (0)
 381                         pr_info("   pte=%p addr=%lx pte=%016lx\n", pte, paddr,
 382                                 pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL).pte);
 383                 pages++;
 384                 set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, prot));
 385                 paddr_last = (paddr & PAGE_MASK) + PAGE_SIZE;
 386         }
 387
 388         update_page_count(PG_LEVEL_4K, pages);
 389
 390         return paddr_last;
 391 }
 392
 393 /*
 394  * Create PMD level page table mapping for physical addresses. The virtual
 395  * and physical address have to be aligned at this level.
 396  * It returns the last physical address mapped.
 397  */
 398 static unsigned long __meminit
 399 phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
 400               unsigned long page_size_mask, pgprot_t prot)
 401 {
 402         unsigned long pages = 0, paddr_next;
 403         unsigned long paddr_last = paddr_end;
 404
 405         int i = pmd_index(paddr);
 406
 407         for (; i < PTRS_PER_PMD; i++, paddr = paddr_next) {
 408                 pmd_t *pmd = pmd_page + pmd_index(paddr);
 409                 pte_t *pte;
 410                 pgprot_t new_prot = prot;
 411
 412                 paddr_next = (paddr & PMD_MASK) + PMD_SIZE;
 413                 if (paddr >= paddr_end) {
 414                         if (!after_bootmem &&
 415                             !e820_any_mapped(paddr & PMD_MASK, paddr_next,
 416                                              E820_RAM) &&
 417                             !e820_any_mapped(paddr & PMD_MASK, paddr_next,
 418                                              E820_RESERVED_KERN))
 419                                 set_pmd(pmd, __pmd(0));
 420                         continue;
 421                 }
 422
 423                 if (!pmd_none(*pmd)) {
 424                         if (!pmd_large(*pmd)) {
 425                                 spin_lock(&init_mm.page_table_lock);
 426                                 pte = (pte_t *)pmd_page_vaddr(*pmd);
 427                                 paddr_last = phys_pte_init(pte, paddr,
 428                                                            paddr_end, prot);
 429                                 spin_unlock(&init_mm.page_table_lock);
 430                                 continue;
 431                         }
 432                         /*
 433                          * If we are ok with PG_LEVEL_2M mapping, then we will
 434                          * use the existing mapping,
 435                          *
 436                          * Otherwise, we will split the large page mapping but
 437                          * use the same existing protection bits except for
 438                          * large page, so that we don't violate Intel's TLB
 439                          * Application note (317080) which says, while changing
 440                          * the page sizes, new and old translations should
 441                          * not differ with respect to page frame and
 442                          * attributes.
 443                          */
 444                         if (page_size_mask & (1 << PG_LEVEL_2M)) {
 445                                 if (!after_bootmem)
 446                                         pages++;
 447                                 paddr_last = paddr_next;
 448                                 continue;
 449                         }
 450                         new_prot = pte_pgprot(pte_clrhuge(*(pte_t *)pmd));
 451                 }
 452
 453                 if (page_size_mask & (1<<PG_LEVEL_2M)) {
 454                         pages++;
 455                         spin_lock(&init_mm.page_table_lock);
 456                         set_pte((pte_t *)pmd,
 457                                 pfn_pte((paddr & PMD_MASK) >> PAGE_SHIFT,
 458                                         __pgprot(pgprot_val(prot) | _PAGE_PSE)));
 459                         spin_unlock(&init_mm.page_table_lock);
 460                         paddr_last = paddr_next;
 461                         continue;
 462                 }
 463
 464                 pte = alloc_low_page();
 465                 paddr_last = phys_pte_init(pte, paddr, paddr_end, new_prot);
 466
 467                 spin_lock(&init_mm.page_table_lock);
 468                 pmd_populate_kernel(&init_mm, pmd, pte);
 469                 spin_unlock(&init_mm.page_table_lock);
 470         }
 471         update_page_count(PG_LEVEL_2M, pages);
 472         return paddr_last;
 473 }
 474
 475 /*
 476  * Create PUD level page table mapping for physical addresses. The virtual
 477  * and physical address do not have to be aligned at this level. KASLR can
 478  * randomize virtual addresses up to this level.
 479  * It returns the last physical address mapped.
 480  */
 481 static unsigned long __meminit
 482 phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
 483               unsigned long page_size_mask)
 484 {
 485         unsigned long pages = 0, paddr_next;
 486         unsigned long paddr_last = paddr_end;
 487         unsigned long vaddr = (unsigned long)__va(paddr);
 488         int i = pud_index(vaddr);
 489
 490         for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
 491                 pud_t *pud;
 492                 pmd_t *pmd;
 493                 pgprot_t prot = PAGE_KERNEL;
 494
 495                 vaddr = (unsigned long)__va(paddr);
 496                 pud = pud_page + pud_index(vaddr);
 497                 paddr_next = (paddr & PUD_MASK) + PUD_SIZE;
 498
 499                 if (paddr >= paddr_end) {
 500                         if (!after_bootmem &&
 501                             !e820_any_mapped(paddr & PUD_MASK, paddr_next,
 502                                              E820_RAM) &&
 503                             !e820_any_mapped(paddr & PUD_MASK, paddr_next,
 504                                              E820_RESERVED_KERN))
 505                                 set_pud(pud, __pud(0));
 506                         continue;
 507                 }
 508
 509                 if (!pud_none(*pud)) {
 510                         if (!pud_large(*pud)) {
 511                                 pmd = pmd_offset(pud, 0);
 512                                 paddr_last = phys_pmd_init(pmd, paddr,
 513                                                            paddr_end,
 514                                                            page_size_mask,
 515                                                            prot);
 516                                 __flush_tlb_all();
 517                                 continue;
 518                         }
 519                         /*
 520                          * If we are ok with PG_LEVEL_1G mapping, then we will
 521                          * use the existing mapping.
 522                          *
 523                          * Otherwise, we will split the gbpage mapping but use
 524                          * the same existing protection  bits except for large
 525                          * page, so that we don't violate Intel's TLB
 526                          * Application note (317080) which says, while changing
 527                          * the page sizes, new and old translations should
 528                          * not differ with respect to page frame and
 529                          * attributes.
 530                          */
 531                         if (page_size_mask & (1 << PG_LEVEL_1G)) {
 532                                 if (!after_bootmem)
 533                                         pages++;
 534                                 paddr_last = paddr_next;
 535                                 continue;
 536                         }
 537                         prot = pte_pgprot(pte_clrhuge(*(pte_t *)pud));
 538                 }
 539
 540                 if (page_size_mask & (1<<PG_LEVEL_1G)) {
 541                         pages++;
 542                         spin_lock(&init_mm.page_table_lock);
 543                         set_pte((pte_t *)pud,
 544                                 pfn_pte((paddr & PUD_MASK) >> PAGE_SHIFT,
 545                                         PAGE_KERNEL_LARGE));
 546                         spin_unlock(&init_mm.page_table_lock);
 547                         paddr_last = paddr_next;
 548                         continue;
 549                 }
 550
 551                 pmd = alloc_low_page();
 552                 paddr_last = phys_pmd_init(pmd, paddr, paddr_end,
 553                                            page_size_mask, prot);
 554
 555                 spin_lock(&init_mm.page_table_lock);
 556                 pud_populate(&init_mm, pud, pmd);
 557                 spin_unlock(&init_mm.page_table_lock);
 558         }
 559         __flush_tlb_all();
 560
 561         update_page_count(PG_LEVEL_1G, pages);
 562
 563         return paddr_last;
 564 }
 565
 566 /*
 567  * Create page table mapping for the physical memory for specific physical
 568  * addresses. The virtual and physical addresses have to be aligned on PMD level
 569  * down. It returns the last physical address mapped.
 570  */
 571 unsigned long __meminit
 572 kernel_physical_mapping_init(unsigned long paddr_start,
 573                              unsigned long paddr_end,
 574                              unsigned long page_size_mask)
 575 {
 576         bool pgd_changed = false;
 577         unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
 578
 579         paddr_last = paddr_end;
 580         vaddr = (unsigned long)__va(paddr_start);
 581         vaddr_end = (unsigned long)__va(paddr_end);
 582         vaddr_start = vaddr;
 583
 584         for (; vaddr < vaddr_end; vaddr = vaddr_next) {
 585                 pgd_t *pgd = pgd_offset_k(vaddr);
 586                 pud_t *pud;
 587
 588                 vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
 589
 590                 if (pgd_val(*pgd)) {
 591                         pud = (pud_t *)pgd_page_vaddr(*pgd);
 592                         paddr_last = phys_pud_init(pud, __pa(vaddr),
 593                                                    __pa(vaddr_end),
 594                                                    page_size_mask);
 595                         continue;
 596                 }
 597
 598                 pud = alloc_low_page();
 599                 paddr_last = phys_pud_init(pud, __pa(vaddr), __pa(vaddr_end),
 600                                            page_size_mask);
 601
 602                 spin_lock(&init_mm.page_table_lock);
 603                 pgd_populate(&init_mm, pgd, pud);
 604                 spin_unlock(&init_mm.page_table_lock);
 605                 pgd_changed = true;
 606         }
 607
 608         if (pgd_changed)
 609                 sync_global_pgds(vaddr_start, vaddr_end - 1, 0);
 610
 611         __flush_tlb_all();
 612
 613         return paddr_last;
 614 }
 615
 616 #ifndef CONFIG_NUMA
 617 void __init initmem_init(void)
 618 {
 619         memblock_set_node(0, (phys_addr_t)ULLONG_MAX, &memblock.memory, 0);
 620 }
 621 #endif
 622
 623 void __init paging_init(void)
 624 {
 625         sparse_memory_present_with_active_regions(MAX_NUMNODES);
 626         sparse_init();
 627
 628         /*
 629          * clear the default setting with node 0
 630          * note: don't use nodes_clear here, that is really clearing when
 631          *       numa support is not compiled in, and later node_set_state
 632          *       will not set it back.
 633          */
 634         node_clear_state(0, N_MEMORY);
 635         if (N_MEMORY != N_NORMAL_MEMORY)
 636                 node_clear_state(0, N_NORMAL_MEMORY);
 637
 638         zone_sizes_init();
 639 }
 640
 641 /*
 642  * Memory hotplug specific functions
 643  */
 644 #ifdef CONFIG_MEMORY_HOTPLUG
 645 /*
 646  * After memory hotplug the variables max_pfn, max_low_pfn and high_memory need
 647  * updating.
 648  */
 649 static void  update_end_of_memory_vars(u64 start, u64 size)
 650 {
 651         unsigned long end_pfn = PFN_UP(start + size);
 652
 653         if (end_pfn > max_pfn) {
 654                 max_pfn = end_pfn;
 655                 max_low_pfn = end_pfn;
 656                 high_memory = (void *)__va(max_pfn * PAGE_SIZE - 1) + 1;
 657         }
 658 }
 659
 660 /*
 661  * Memory is added always to NORMAL zone. This means you will never get
 662  * additional DMA/DMA32 memory.
 663  */
 664 int arch_add_memory(int nid, u64 start, u64 size, bool for_device)
 665 {
 666         struct pglist_data *pgdat = NODE_DATA(nid);
 667         struct zone *zone = pgdat->node_zones +
 668                 zone_for_memory(nid, start, size, ZONE_NORMAL, for_device);
 669         unsigned long start_pfn = start >> PAGE_SHIFT;
 670         unsigned long nr_pages = size >> PAGE_SHIFT;
 671         int ret;
 672
 673         init_memory_mapping(start, start + size);
 674
 675         ret = __add_pages(nid, zone, start_pfn, nr_pages);
 676         WARN_ON_ONCE(ret);
 677
 678         /* update max_pfn, max_low_pfn and high_memory */
 679         update_end_of_memory_vars(start, size);
 680
 681         return ret;
 682 }
 683 EXPORT_SYMBOL_GPL(arch_add_memory);
 684
 685 #define PAGE_INUSE 0xFD
 686
 687 static void __meminit free_pagetable(struct page *page, int order)
 688 {
 689         unsigned long magic;
 690         unsigned int nr_pages = 1 << order;
 691         struct vmem_altmap *altmap = to_vmem_altmap((unsigned long) page);
 692
 693         if (altmap) {
 694                 vmem_altmap_free(altmap, nr_pages);
 695                 return;
 696         }
 697
 698         /* bootmem page has reserved flag */
 699         if (PageReserved(page)) {
 700                 __ClearPageReserved(page);
 701
 702                 magic = (unsigned long)page->freelist;
 703                 if (magic == SECTION_INFO || magic == MIX_SECTION_INFO) {
 704                         while (nr_pages--)
 705                                 put_page_bootmem(page++);
 706                 } else
 707                         while (nr_pages--)
 708                                 free_reserved_page(page++);
 709         } else
 710                 free_pages((unsigned long)page_address(page), order);
 711 }
 712
 713 static void __meminit free_pte_table(pte_t *pte_start, pmd_t *pmd)
 714 {
 715         pte_t *pte;
 716         int i;
 717
 718         for (i = 0; i < PTRS_PER_PTE; i++) {
 719                 pte = pte_start + i;
 720                 if (!pte_none(*pte))
 721                         return;
 722         }
 723
 724         /* free a pte talbe */
 725         free_pagetable(pmd_page(*pmd), 0);
 726         spin_lock(&init_mm.page_table_lock);
 727         pmd_clear(pmd);
 728         spin_unlock(&init_mm.page_table_lock);
 729 }
 730
 731 static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
 732 {
 733         pmd_t *pmd;
 734         int i;
 735
 736         for (i = 0; i < PTRS_PER_PMD; i++) {
 737                 pmd = pmd_start + i;
 738                 if (!pmd_none(*pmd))
 739                         return;
 740         }
 741
 742         /* free a pmd talbe */
 743         free_pagetable(pud_page(*pud), 0);
 744         spin_lock(&init_mm.page_table_lock);
 745         pud_clear(pud);
 746         spin_unlock(&init_mm.page_table_lock);
 747 }
 748
 749 static void __meminit
 750 remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
 751                  bool direct)
 752 {
 753         unsigned long next, pages = 0;
 754         pte_t *pte;
 755         void *page_addr;
 756         phys_addr_t phys_addr;
 757
 758         pte = pte_start + pte_index(addr);
 759         for (; addr < end; addr = next, pte++) {
 760                 next = (addr + PAGE_SIZE) & PAGE_MASK;
 761                 if (next > end)
 762                         next = end;
 763
 764                 if (!pte_present(*pte))
 765                         continue;
 766
 767                 /*
 768                  * We mapped [0,1G) memory as identity mapping when
 769                  * initializing, in arch/x86/kernel/head_64.S. These
 770                  * pagetables cannot be removed.
 771                  */
 772                 phys_addr = pte_val(*pte) + (addr & PAGE_MASK);
 773                 if (phys_addr < (phys_addr_t)0x40000000)
 774                         return;
 775
 776                 if (PAGE_ALIGNED(addr) && PAGE_ALIGNED(next)) {
 777                         /*
 778                          * Do not free direct mapping pages since they were
 779                          * freed when offlining, or simplely not in use.
 780                          */
 781                         if (!direct)
 782                                 free_pagetable(pte_page(*pte), 0);
 783
 784                         spin_lock(&init_mm.page_table_lock);
 785                         pte_clear(&init_mm, addr, pte);
 786                         spin_unlock(&init_mm.page_table_lock);
 787
 788                         /* For non-direct mapping, pages means nothing. */
 789                         pages++;
 790                 } else {
 791                         /*
 792                          * If we are here, we are freeing vmemmap pages since
 793                          * direct mapped memory ranges to be freed are aligned.
 794                          *
 795                          * If we are not removing the whole page, it means
 796                          * other page structs in this page are being used and
 797                          * we canot remove them. So fill the unused page_structs
 798                          * with 0xFD, and remove the page when it is wholly
 799                          * filled with 0xFD.
 800                          */
 801                         memset((void *)addr, PAGE_INUSE, next - addr);
 802
 803                         page_addr = page_address(pte_page(*pte));
 804                         if (!memchr_inv(page_addr, PAGE_INUSE, PAGE_SIZE)) {
 805                                 free_pagetable(pte_page(*pte), 0);
 806
 807                                 spin_lock(&init_mm.page_table_lock);
 808                                 pte_clear(&init_mm, addr, pte);
 809                                 spin_unlock(&init_mm.page_table_lock);
 810                         }
 811                 }
 812         }
 813
 814         /* Call free_pte_table() in remove_pmd_table(). */
 815         flush_tlb_all();
 816         if (direct)
 817                 update_page_count(PG_LEVEL_4K, -pages);
 818 }
 819
 820 static void __meminit
 821 remove_pmd_table(pmd_t *pmd_start, unsigned long addr, unsigned long end,
 822                  bool direct)
 823 {
 824         unsigned long next, pages = 0;
 825         pte_t *pte_base;
 826         pmd_t *pmd;
 827         void *page_addr;
 828
 829         pmd = pmd_start + pmd_index(addr);
 830         for (; addr < end; addr = next, pmd++) {
 831                 next = pmd_addr_end(addr, end);
 832
 833                 if (!pmd_present(*pmd))
 834                         continue;
 835
 836                 if (pmd_large(*pmd)) {
 837                         if (IS_ALIGNED(addr, PMD_SIZE) &&
 838                             IS_ALIGNED(next, PMD_SIZE)) {
 839                                 if (!direct)
 840                                         free_pagetable(pmd_page(*pmd),
 841                                                        get_order(PMD_SIZE));
 842
 843                                 spin_lock(&init_mm.page_table_lock);
 844                                 pmd_clear(pmd);
 845                                 spin_unlock(&init_mm.page_table_lock);
 846                                 pages++;
 847                         } else {
 848                                 /* If here, we are freeing vmemmap pages. */
 849                                 memset((void *)addr, PAGE_INUSE, next - addr);
 850
 851                                 page_addr = page_address(pmd_page(*pmd));
 852                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 853                                                 PMD_SIZE)) {
 854                                         free_pagetable(pmd_page(*pmd),
 855                                                        get_order(PMD_SIZE));
 856
 857                                         spin_lock(&init_mm.page_table_lock);
 858                                         pmd_clear(pmd);
 859                                         spin_unlock(&init_mm.page_table_lock);
 860                                 }
 861                         }
 862
 863                         continue;
 864                 }
 865
 866                 pte_base = (pte_t *)pmd_page_vaddr(*pmd);
 867                 remove_pte_table(pte_base, addr, next, direct);
 868                 free_pte_table(pte_base, pmd);
 869         }
 870
 871         /* Call free_pmd_table() in remove_pud_table(). */
 872         if (direct)
 873                 update_page_count(PG_LEVEL_2M, -pages);
 874 }
 875
 876 static void __meminit
 877 remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
 878                  bool direct)
 879 {
 880         unsigned long next, pages = 0;
 881         pmd_t *pmd_base;
 882         pud_t *pud;
 883         void *page_addr;
 884
 885         pud = pud_start + pud_index(addr);
 886         for (; addr < end; addr = next, pud++) {
 887                 next = pud_addr_end(addr, end);
 888
 889                 if (!pud_present(*pud))
 890                         continue;
 891
 892                 if (pud_large(*pud)) {
 893                         if (IS_ALIGNED(addr, PUD_SIZE) &&
 894                             IS_ALIGNED(next, PUD_SIZE)) {
 895                                 if (!direct)
 896                                         free_pagetable(pud_page(*pud),
 897                                                        get_order(PUD_SIZE));
 898
 899                                 spin_lock(&init_mm.page_table_lock);
 900                                 pud_clear(pud);
 901                                 spin_unlock(&init_mm.page_table_lock);
 902                                 pages++;
 903                         } else {
 904                                 /* If here, we are freeing vmemmap pages. */
 905                                 memset((void *)addr, PAGE_INUSE, next - addr);
 906
 907                                 page_addr = page_address(pud_page(*pud));
 908                                 if (!memchr_inv(page_addr, PAGE_INUSE,
 909                                                 PUD_SIZE)) {
 910                                         free_pagetable(pud_page(*pud),
 911                                                        get_order(PUD_SIZE));
 912
 913                                         spin_lock(&init_mm.page_table_lock);
 914                                         pud_clear(pud);
 915                                         spin_unlock(&init_mm.page_table_lock);
 916                                 }
 917                         }
 918
 919                         continue;
 920                 }
 921
 922                 pmd_base = (pmd_t *)pud_page_vaddr(*pud);
 923                 remove_pmd_table(pmd_base, addr, next, direct);
 924                 free_pmd_table(pmd_base, pud);
 925         }
 926
 927         if (direct)
 928                 update_page_count(PG_LEVEL_1G, -pages);
 929 }
 930
 931 /* start and end are both virtual address. */
 932 static void __meminit
 933 remove_pagetable(unsigned long start, unsigned long end, bool direct)
 934 {
 935         unsigned long next;
 936         unsigned long addr;
 937         pgd_t *pgd;
 938         pud_t *pud;
 939
 940         for (addr = start; addr < end; addr = next) {
 941                 next = pgd_addr_end(addr, end);
 942
 943                 pgd = pgd_offset_k(addr);
 944                 if (!pgd_present(*pgd))
 945                         continue;
 946
 947                 pud = (pud_t *)pgd_page_vaddr(*pgd);
 948                 remove_pud_table(pud, addr, next, direct);
 949         }
 950
 951         flush_tlb_all();
 952 }
 953
 954 void __ref vmemmap_free(unsigned long start, unsigned long end)
 955 {
 956         remove_pagetable(start, end, false);
 957 }
 958
 959 #ifdef CONFIG_MEMORY_HOTREMOVE
 960 static void __meminit
 961 kernel_physical_mapping_remove(unsigned long start, unsigned long end)
 962 {
 963         start = (unsigned long)__va(start);
 964         end = (unsigned long)__va(end);
 965
 966         remove_pagetable(start, end, true);
 967 }
 968
 969 int __ref arch_remove_memory(u64 start, u64 size)
 970 {
 971         unsigned long start_pfn = start >> PAGE_SHIFT;
 972         unsigned long nr_pages = size >> PAGE_SHIFT;
 973         struct page *page = pfn_to_page(start_pfn);
 974         struct vmem_altmap *altmap;
 975         struct zone *zone;
 976         int ret;
 977
 978         /* With altmap the first mapped page is offset from @start */
 979         altmap = to_vmem_altmap((unsigned long) page);
 980         if (altmap)
 981                 page += vmem_altmap_offset(altmap);
 982         zone = page_zone(page);
 983         ret = __remove_pages(zone, start_pfn, nr_pages);
 984         WARN_ON_ONCE(ret);
 985         kernel_physical_mapping_remove(start, start + size);
 986
 987         return ret;
 988 }
 989 #endif
 990 #endif /* CONFIG_MEMORY_HOTPLUG */
 991
 992 static struct kcore_list kcore_vsyscall;
 993
 994 static void __init register_page_bootmem_info(void)
 995 {
 996 #ifdef CONFIG_NUMA
 997         int i;
 998
 999         for_each_online_node(i)
1000                 register_page_bootmem_info_node(NODE_DATA(i));
1001 #endif
1002 }
1003
1004 void __init mem_init(void)
1005 {
1006         pci_iommu_alloc();
1007
1008         /* clear_bss() already clear the empty_zero_page */
1009
1010         register_page_bootmem_info();
1011
1012         /* this will put all memory onto the freelists */
1013         free_all_bootmem();
1014         after_bootmem = 1;
1015
1016         /* Register memory areas for /proc/kcore */
1017         kclist_add(&kcore_vsyscall, (void *)VSYSCALL_ADDR, PAGE_SIZE, KCORE_USER);
1018
1019         mem_init_print_info(NULL);
1020 }
1021
1022 const int rodata_test_data = 0xC3;
1023 EXPORT_SYMBOL_GPL(rodata_test_data);
1024
1025 int kernel_set_to_readonly;
1026
1027 void set_kernel_text_rw(void)
1028 {
1029         unsigned long start = PFN_ALIGN(_text);
1030         unsigned long end = PFN_ALIGN(__stop___ex_table);
1031
1032         if (!kernel_set_to_readonly)
1033                 return;
1034
1035         pr_debug("Set kernel text: %lx - %lx for read write\n",
1036                  start, end);
1037
1038         /*
1039          * Make the kernel identity mapping for text RW. Kernel text
1040          * mapping will always be RO. Refer to the comment in
1041          * static_protections() in pageattr.c
1042          */
1043         set_memory_rw(start, (end - start) >> PAGE_SHIFT);
1044 }
1045
1046 void set_kernel_text_ro(void)
1047 {
1048         unsigned long start = PFN_ALIGN(_text);
1049         unsigned long end = PFN_ALIGN(__stop___ex_table);
1050
1051         if (!kernel_set_to_readonly)
1052                 return;
1053
1054         pr_debug("Set kernel text: %lx - %lx for read only\n",
1055                  start, end);
1056
1057         /*
1058          * Set the kernel identity mapping for text RO.
1059          */
1060         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1061 }
1062
1063 void mark_rodata_ro(void)
1064 {
1065         unsigned long start = PFN_ALIGN(_text);
1066         unsigned long rodata_start = PFN_ALIGN(__start_rodata);
1067         unsigned long end = (unsigned long) &__end_rodata_hpage_align;
1068         unsigned long text_end = PFN_ALIGN(&__stop___ex_table);
1069         unsigned long rodata_end = PFN_ALIGN(&__end_rodata);
1070         unsigned long all_end;
1071
1072         printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
1073                (end - start) >> 10);
1074         set_memory_ro(start, (end - start) >> PAGE_SHIFT);
1075
1076         kernel_set_to_readonly = 1;
1077
1078         /*
1079          * The rodata/data/bss/brk section (but not the kernel text!)
1080          * should also be not-executable.
1081          *
1082          * We align all_end to PMD_SIZE because the existing mapping
1083          * is a full PMD. If we would align _brk_end to PAGE_SIZE we
1084          * split the PMD and the reminder between _brk_end and the end
1085          * of the PMD will remain mapped executable.
1086          *
1087          * Any PMD which was setup after the one which covers _brk_end
1088          * has been zapped already via cleanup_highmem().
1089          */
1090         all_end = roundup((unsigned long)_brk_end, PMD_SIZE);
1091         set_memory_nx(text_end, (all_end - text_end) >> PAGE_SHIFT);
1092
1093         rodata_test();
1094
1095 #ifdef CONFIG_CPA_DEBUG
1096         printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
1097         set_memory_rw(start, (end-start) >> PAGE_SHIFT);
1098
1099         printk(KERN_INFO "Testing CPA: again\n");
1100         set_memory_ro(start, (end-start) >> PAGE_SHIFT);
1101 #endif
1102
1103         free_init_pages("unused kernel",
1104                         (unsigned long) __va(__pa_symbol(text_end)),
1105                         (unsigned long) __va(__pa_symbol(rodata_start)));
1106         free_init_pages("unused kernel",
1107                         (unsigned long) __va(__pa_symbol(rodata_end)),
1108                         (unsigned long) __va(__pa_symbol(_sdata)));
1109
1110         debug_checkwx();
1111 }
1112
1113 int kern_addr_valid(unsigned long addr)
1114 {
1115         unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
1116         pgd_t *pgd;
1117         pud_t *pud;
1118         pmd_t *pmd;
1119         pte_t *pte;
1120
1121         if (above != 0 && above != -1UL)
1122                 return 0;
1123
1124         pgd = pgd_offset_k(addr);
1125         if (pgd_none(*pgd))
1126                 return 0;
1127
1128         pud = pud_offset(pgd, addr);
1129         if (!pud_present(*pud))
1130                 return 0;
1131
1132         if (pud_large(*pud))
1133                 return pfn_valid(pud_pfn(*pud));
1134
1135         pmd = pmd_offset(pud, addr);
1136         if (!pmd_present(*pmd))
1137                 return 0;
1138
1139         if (pmd_large(*pmd))
1140                 return pfn_valid(pmd_pfn(*pmd));
1141
1142         pte = pte_offset_kernel(pmd, addr);
1143         if (!pte_present(*pte))
1144                 return 0;
1145
1146         return pfn_valid(pte_pfn(*pte));
1147 }
1148
1149 static unsigned long probe_memory_block_size(void)
1150 {
1151         unsigned long bz = MIN_MEMORY_BLOCK_SIZE;
1152
1153         /* if system is UV or has 64GB of RAM or more, use large blocks */
1154         if (is_uv_system() || ((max_pfn << PAGE_SHIFT) >= (64UL << 30)))
1155                 bz = 2UL << 30; /* 2GB */
1156
1157         pr_info("x86/mm: Memory block size: %ldMB\n", bz >> 20);
1158
1159         return bz;
1160 }
1161
1162 static unsigned long memory_block_size_probed;
1163 unsigned long memory_block_size_bytes(void)
1164 {
1165         if (!memory_block_size_probed)
1166                 memory_block_size_probed = probe_memory_block_size();
1167
1168         return memory_block_size_probed;
1169 }
1170
1171 #ifdef CONFIG_SPARSEMEM_VMEMMAP
1172 /*
1173  * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
1174  */
1175 static long __meminitdata addr_start, addr_end;
1176 static void __meminitdata *p_start, *p_end;
1177 static int __meminitdata node_start;
1178
1179 static int __meminit vmemmap_populate_hugepages(unsigned long start,
1180                 unsigned long end, int node, struct vmem_altmap *altmap)
1181 {
1182         unsigned long addr;
1183         unsigned long next;
1184         pgd_t *pgd;
1185         pud_t *pud;
1186         pmd_t *pmd;
1187
1188         for (addr = start; addr < end; addr = next) {
1189                 next = pmd_addr_end(addr, end);
1190
1191                 pgd = vmemmap_pgd_populate(addr, node);
1192                 if (!pgd)
1193                         return -ENOMEM;
1194
1195                 pud = vmemmap_pud_populate(pgd, addr, node);
1196                 if (!pud)
1197                         return -ENOMEM;
1198
1199                 pmd = pmd_offset(pud, addr);
1200                 if (pmd_none(*pmd)) {
1201                         void *p;
1202
1203                         p = __vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
1204                         if (p) {
1205                                 pte_t entry;
1206
1207                                 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
1208                                                 PAGE_KERNEL_LARGE);
1209                                 set_pmd(pmd, __pmd(pte_val(entry)));
1210
1211                                 /* check to see if we have contiguous blocks */
1212                                 if (p_end != p || node_start != node) {
1213                                         if (p_start)
1214                                                 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1215                                                        addr_start, addr_end-1, p_start, p_end-1, node_start);
1216                                         addr_start = addr;
1217                                         node_start = node;
1218                                         p_start = p;
1219                                 }
1220
1221                                 addr_end = addr + PMD_SIZE;
1222                                 p_end = p + PMD_SIZE;
1223                                 continue;
1224                         } else if (altmap)
1225                                 return -ENOMEM; /* no fallback */
1226                 } else if (pmd_large(*pmd)) {
1227                         vmemmap_verify((pte_t *)pmd, node, addr, next);
1228                         continue;
1229                 }
1230                 pr_warn_once("vmemmap: falling back to regular page backing\n");
1231                 if (vmemmap_populate_basepages(addr, next, node))
1232                         return -ENOMEM;
1233         }
1234         return 0;
1235 }
1236
1237 int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node)
1238 {
1239         struct vmem_altmap *altmap = to_vmem_altmap(start);
1240         int err;
1241
1242         if (boot_cpu_has(X86_FEATURE_PSE))
1243                 err = vmemmap_populate_hugepages(start, end, node, altmap);
1244         else if (altmap) {
1245                 pr_err_once("%s: no cpu support for altmap allocations\n",
1246                                 __func__);
1247                 err = -ENOMEM;
1248         } else
1249                 err = vmemmap_populate_basepages(start, end, node);
1250         if (!err)
1251                 sync_global_pgds(start, end - 1, 0);
1252         return err;
1253 }
1254
1255 #if defined(CONFIG_MEMORY_HOTPLUG_SPARSE) && defined(CONFIG_HAVE_BOOTMEM_INFO_NODE)
1256 void register_page_bootmem_memmap(unsigned long section_nr,
1257                                   struct page *start_page, unsigned long size)
1258 {
1259         unsigned long addr = (unsigned long)start_page;
1260         unsigned long end = (unsigned long)(start_page + size);
1261         unsigned long next;
1262         pgd_t *pgd;
1263         pud_t *pud;
1264         pmd_t *pmd;
1265         unsigned int nr_pages;
1266         struct page *page;
1267
1268         for (; addr < end; addr = next) {
1269                 pte_t *pte = NULL;
1270
1271                 pgd = pgd_offset_k(addr);
1272                 if (pgd_none(*pgd)) {
1273                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1274                         continue;
1275                 }
1276                 get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
1277
1278                 pud = pud_offset(pgd, addr);
1279                 if (pud_none(*pud)) {
1280                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1281                         continue;
1282                 }
1283                 get_page_bootmem(section_nr, pud_page(*pud), MIX_SECTION_INFO);
1284
1285                 if (!boot_cpu_has(X86_FEATURE_PSE)) {
1286                         next = (addr + PAGE_SIZE) & PAGE_MASK;
1287                         pmd = pmd_offset(pud, addr);
1288                         if (pmd_none(*pmd))
1289                                 continue;
1290                         get_page_bootmem(section_nr, pmd_page(*pmd),
1291                                          MIX_SECTION_INFO);
1292
1293                         pte = pte_offset_kernel(pmd, addr);
1294                         if (pte_none(*pte))
1295                                 continue;
1296                         get_page_bootmem(section_nr, pte_page(*pte),
1297                                          SECTION_INFO);
1298                 } else {
1299                         next = pmd_addr_end(addr, end);
1300
1301                         pmd = pmd_offset(pud, addr);
1302                         if (pmd_none(*pmd))
1303                                 continue;
1304
1305                         nr_pages = 1 << (get_order(PMD_SIZE));
1306                         page = pmd_page(*pmd);
1307                         while (nr_pages--)
1308                                 get_page_bootmem(section_nr, page++,
1309                                                  SECTION_INFO);
1310                 }
1311         }
1312 }
1313 #endif
1314
1315 void __meminit vmemmap_populate_print_last(void)
1316 {
1317         if (p_start) {
1318                 pr_debug(" [%lx-%lx] PMD -> [%p-%p] on node %d\n",
1319                         addr_start, addr_end-1, p_start, p_end-1, node_start);
1320                 p_start = NULL;
1321                 p_end = NULL;
1322                 node_start = 0;
1323         }
1324 }
1325 #endif