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