2 * linux/arch/x86_64/mm/init.c
4 * Copyright (C) 1995 Linus Torvalds
5 * Copyright (C) 2000 Pavel Machek <pavel@suse.cz>
6 * Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
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>
18 #include <linux/swap.h>
19 #include <linux/smp.h>
20 #include <linux/init.h>
21 #include <linux/pagemap.h>
22 #include <linux/bootmem.h>
23 #include <linux/proc_fs.h>
24 #include <linux/pci.h>
25 #include <linux/pfn.h>
26 #include <linux/poison.h>
27 #include <linux/dma-mapping.h>
28 #include <linux/module.h>
29 #include <linux/memory_hotplug.h>
30 #include <linux/nmi.h>
32 #include <asm/processor.h>
33 #include <asm/system.h>
34 #include <asm/uaccess.h>
35 #include <asm/pgtable.h>
36 #include <asm/pgalloc.h>
38 #include <asm/fixmap.h>
42 #include <asm/mmu_context.h>
43 #include <asm/proto.h>
45 #include <asm/sections.h>
46 #include <asm/kdebug.h>
48 #include <asm/cacheflush.h>
50 static unsigned long dma_reserve __initdata;
52 DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
54 int direct_gbpages __meminitdata
55 #ifdef CONFIG_DIRECT_GBPAGES
60 static int __init parse_direct_gbpages_off(char *arg)
65 early_param("nogbpages", parse_direct_gbpages_off);
67 static int __init parse_direct_gbpages_on(char *arg)
72 early_param("gbpages", parse_direct_gbpages_on);
75 * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
76 * physical space so we can cache the place of the first one and move
77 * around without checking the pgd every time.
82 long i, total = 0, reserved = 0;
83 long shared = 0, cached = 0;
87 printk(KERN_INFO "Mem-info:\n");
89 for_each_online_pgdat(pgdat) {
90 for (i = 0; i < pgdat->node_spanned_pages; ++i) {
92 * This loop can take a while with 256 GB and
93 * 4k pages so defer the NMI watchdog:
95 if (unlikely(i % MAX_ORDER_NR_PAGES == 0))
98 if (!pfn_valid(pgdat->node_start_pfn + i))
101 page = pfn_to_page(pgdat->node_start_pfn + i);
103 if (PageReserved(page))
105 else if (PageSwapCache(page))
107 else if (page_count(page))
108 shared += page_count(page) - 1;
111 printk(KERN_INFO "%lu pages of RAM\n", total);
112 printk(KERN_INFO "%lu reserved pages\n", reserved);
113 printk(KERN_INFO "%lu pages shared\n", shared);
114 printk(KERN_INFO "%lu pages swap cached\n", cached);
119 static __init void *spp_getpage(void)
124 ptr = (void *) get_zeroed_page(GFP_ATOMIC);
126 ptr = alloc_bootmem_pages(PAGE_SIZE);
128 if (!ptr || ((unsigned long)ptr & ~PAGE_MASK)) {
129 panic("set_pte_phys: cannot allocate page data %s\n",
130 after_bootmem ? "after bootmem" : "");
133 pr_debug("spp_getpage %p\n", ptr);
139 set_pte_phys(unsigned long vaddr, unsigned long phys, pgprot_t prot)
146 pr_debug("set_pte_phys %lx to %lx\n", vaddr, phys);
148 pgd = pgd_offset_k(vaddr);
149 if (pgd_none(*pgd)) {
151 "PGD FIXMAP MISSING, it should be setup in head.S!\n");
154 pud = pud_offset(pgd, vaddr);
155 if (pud_none(*pud)) {
156 pmd = (pmd_t *) spp_getpage();
157 set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
158 if (pmd != pmd_offset(pud, 0)) {
159 printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
160 pmd, pmd_offset(pud, 0));
164 pmd = pmd_offset(pud, vaddr);
165 if (pmd_none(*pmd)) {
166 pte = (pte_t *) spp_getpage();
167 set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
168 if (pte != pte_offset_kernel(pmd, 0)) {
169 printk(KERN_ERR "PAGETABLE BUG #02!\n");
173 new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
175 pte = pte_offset_kernel(pmd, vaddr);
176 if (!pte_none(*pte) &&
177 pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
179 set_pte(pte, new_pte);
182 * It's enough to flush this one mapping.
183 * (PGE mappings get flushed as well)
185 __flush_tlb_one(vaddr);
189 * The head.S code sets up the kernel high mapping:
191 * from __START_KERNEL_map to __START_KERNEL_map + size (== _end-_text)
193 * phys_addr holds the negative offset to the kernel, which is added
194 * to the compile time generated pmds. This results in invalid pmds up
195 * to the point where we hit the physaddr 0 mapping.
197 * We limit the mappings to the region from _text to _end. _end is
198 * rounded up to the 2MB boundary. This catches the invalid pmds as
199 * well, as they are located before _text:
201 void __init cleanup_highmap(void)
203 unsigned long vaddr = __START_KERNEL_map;
204 unsigned long end = round_up((unsigned long)_end, PMD_SIZE) - 1;
205 pmd_t *pmd = level2_kernel_pgt;
206 pmd_t *last_pmd = pmd + PTRS_PER_PMD;
208 for (; pmd < last_pmd; pmd++, vaddr += PMD_SIZE) {
209 if (!pmd_present(*pmd))
211 if (vaddr < (unsigned long) _text || vaddr > end)
212 set_pmd(pmd, __pmd(0));
216 /* NOTE: this is meant to be run only at boot */
218 __set_fixmap(enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
220 unsigned long address = __fix_to_virt(idx);
222 if (idx >= __end_of_fixed_addresses) {
223 printk(KERN_ERR "Invalid __set_fixmap\n");
226 set_pte_phys(address, phys, prot);
229 static unsigned long __initdata table_start;
230 static unsigned long __meminitdata table_end;
232 static __meminit void *alloc_low_page(unsigned long *phys)
234 unsigned long pfn = table_end++;
238 adr = (void *)get_zeroed_page(GFP_ATOMIC);
245 panic("alloc_low_page: ran out of memory");
247 adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
248 memset(adr, 0, PAGE_SIZE);
249 *phys = pfn * PAGE_SIZE;
253 static __meminit void unmap_low_page(void *adr)
258 early_iounmap(adr, PAGE_SIZE);
261 /* Must run before zap_low_mappings */
262 __meminit void *early_ioremap(unsigned long addr, unsigned long size)
264 pmd_t *pmd, *last_pmd;
268 pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
269 vaddr = __START_KERNEL_map;
270 pmd = level2_kernel_pgt;
271 last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
273 for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
274 for (i = 0; i < pmds; i++) {
275 if (pmd_present(pmd[i]))
276 goto continue_outer_loop;
278 vaddr += addr & ~PMD_MASK;
281 for (i = 0; i < pmds; i++, addr += PMD_SIZE)
282 set_pmd(pmd+i, __pmd(addr | __PAGE_KERNEL_LARGE_EXEC));
285 return (void *)vaddr;
289 printk(KERN_ERR "early_ioremap(0x%lx, %lu) failed\n", addr, size);
295 * To avoid virtual aliases later:
297 __meminit void early_iounmap(void *addr, unsigned long size)
303 vaddr = (unsigned long)addr;
304 pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
305 pmd = level2_kernel_pgt + pmd_index(vaddr);
307 for (i = 0; i < pmds; i++)
313 static unsigned long __meminit
314 phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
316 int i = pmd_index(address);
318 for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
319 pmd_t *pmd = pmd_page + pmd_index(address);
321 if (address >= end) {
322 if (!after_bootmem) {
323 for (; i < PTRS_PER_PMD; i++, pmd++)
324 set_pmd(pmd, __pmd(0));
332 set_pte((pte_t *)pmd,
333 pfn_pte(address >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
338 static unsigned long __meminit
339 phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
341 pmd_t *pmd = pmd_offset(pud, 0);
342 unsigned long last_map_addr;
344 spin_lock(&init_mm.page_table_lock);
345 last_map_addr = phys_pmd_init(pmd, address, end);
346 spin_unlock(&init_mm.page_table_lock);
348 return last_map_addr;
351 static unsigned long __meminit
352 phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
354 unsigned long last_map_addr = end;
355 int i = pud_index(addr);
357 for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE) {
358 unsigned long pmd_phys;
359 pud_t *pud = pud_page + pud_index(addr);
365 if (!after_bootmem &&
366 !e820_any_mapped(addr, addr+PUD_SIZE, 0)) {
367 set_pud(pud, __pud(0));
372 if (!pud_large(*pud))
373 last_map_addr = phys_pmd_update(pud, addr, end);
377 if (direct_gbpages) {
378 set_pte((pte_t *)pud,
379 pfn_pte(addr >> PAGE_SHIFT, PAGE_KERNEL_LARGE));
380 last_map_addr = (addr & PUD_MASK) + PUD_SIZE;
384 pmd = alloc_low_page(&pmd_phys);
386 spin_lock(&init_mm.page_table_lock);
387 set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
388 last_map_addr = phys_pmd_init(pmd, addr, end);
389 spin_unlock(&init_mm.page_table_lock);
395 return last_map_addr >> PAGE_SHIFT;
398 static void __init find_early_table_space(unsigned long end)
400 unsigned long puds, pmds, tables, start;
402 puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
403 tables = round_up(puds * sizeof(pud_t), PAGE_SIZE);
404 if (!direct_gbpages) {
405 pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
406 tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
410 * RED-PEN putting page tables only on node 0 could
411 * cause a hotspot and fill up ZONE_DMA. The page tables
412 * need roughly 0.5KB per GB.
415 table_start = find_e820_area(start, end, tables, PAGE_SIZE);
416 if (table_start == -1UL)
417 panic("Cannot find space for the kernel page tables");
419 table_start >>= PAGE_SHIFT;
420 table_end = table_start;
422 early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
423 end, table_start << PAGE_SHIFT,
424 (table_start << PAGE_SHIFT) + tables);
427 static void __init init_gbpages(void)
429 if (direct_gbpages && cpu_has_gbpages)
430 printk(KERN_INFO "Using GB pages for direct mapping\n");
435 #ifdef CONFIG_MEMTEST_BOOTPARAM
437 static void __init memtest(unsigned long start_phys, unsigned long size,
441 unsigned long *start;
442 unsigned long start_bad;
443 unsigned long last_bad;
445 unsigned long start_phys_aligned;
457 val = 0x5555555555555555UL;
460 val = 0xaaaaaaaaaaaaaaaaUL;
466 incr = sizeof(unsigned long);
467 start_phys_aligned = ALIGN(start_phys, incr);
468 count = (size - (start_phys_aligned - start_phys))/incr;
469 start = __va(start_phys_aligned);
473 for (i = 0; i < count; i++)
475 for (i = 0; i < count; i++, start++, start_phys_aligned += incr) {
477 if (start_phys_aligned == last_bad + incr) {
481 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
482 val, start_bad, last_bad + incr);
483 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
485 start_bad = last_bad = start_phys_aligned;
490 printk(KERN_CONT "\n %016lx bad mem addr %016lx - %016lx reserved",
491 val, start_bad, last_bad + incr);
492 reserve_early(start_bad, last_bad - start_bad, "BAD RAM");
497 static int memtest_pattern __initdata = CONFIG_MEMTEST_BOOTPARAM_VALUE;
499 static int __init parse_memtest(char *arg)
502 memtest_pattern = simple_strtoul(arg, NULL, 0);
506 early_param("memtest", parse_memtest);
508 static void __init early_memtest(unsigned long start, unsigned long end)
510 unsigned long t_start, t_size;
513 if (!memtest_pattern)
516 printk(KERN_INFO "early_memtest: pattern num %d", memtest_pattern);
517 for (pattern = 0; pattern < memtest_pattern; pattern++) {
520 while (t_start < end) {
521 t_start = find_e820_area_size(t_start, &t_size, 1);
526 if (t_start + t_size > end)
527 t_size = end - t_start;
529 printk(KERN_CONT "\n %016lx - %016lx pattern %d",
530 t_start, t_start + t_size, pattern);
532 memtest(t_start, t_size, pattern);
537 printk(KERN_CONT "\n");
540 static void __init early_memtest(unsigned long start, unsigned long end)
546 * Setup the direct mapping of the physical memory at PAGE_OFFSET.
547 * This runs before bootmem is initialized and gets pages directly from
548 * the physical memory. To access them they are temporarily mapped.
550 unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned long end)
552 unsigned long next, last_map_addr = end;
553 unsigned long start_phys = start, end_phys = end;
555 printk(KERN_INFO "init_memory_mapping\n");
558 * Find space for the kernel direct mapping tables.
560 * Later we should allocate these tables in the local node of the
561 * memory mapped. Unfortunately this is done currently before the
562 * nodes are discovered.
564 if (!after_bootmem) {
566 find_early_table_space(end);
569 start = (unsigned long)__va(start);
570 end = (unsigned long)__va(end);
572 for (; start < end; start = next) {
573 pgd_t *pgd = pgd_offset_k(start);
574 unsigned long pud_phys;
578 pud = pud_offset(pgd, start & PGDIR_MASK);
580 pud = alloc_low_page(&pud_phys);
582 next = start + PGDIR_SIZE;
585 last_map_addr = phys_pud_init(pud, __pa(start), __pa(next));
587 set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
592 mmu_cr4_features = read_cr4();
596 reserve_early(table_start << PAGE_SHIFT,
597 table_end << PAGE_SHIFT, "PGTABLE");
600 early_memtest(start_phys, end_phys);
602 return last_map_addr;
606 void __init paging_init(void)
608 unsigned long max_zone_pfns[MAX_NR_ZONES];
610 memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
611 max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
612 max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
613 max_zone_pfns[ZONE_NORMAL] = end_pfn;
615 memory_present(0, 0, end_pfn);
617 free_area_init_nodes(max_zone_pfns);
622 * Memory hotplug specific functions
624 void online_page(struct page *page)
626 ClearPageReserved(page);
627 init_page_count(page);
633 #ifdef CONFIG_MEMORY_HOTPLUG
635 * Memory is added always to NORMAL zone. This means you will never get
636 * additional DMA/DMA32 memory.
638 int arch_add_memory(int nid, u64 start, u64 size)
640 struct pglist_data *pgdat = NODE_DATA(nid);
641 struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
642 unsigned long last_mapped_pfn, start_pfn = start >> PAGE_SHIFT;
643 unsigned long nr_pages = size >> PAGE_SHIFT;
646 last_mapped_pfn = init_memory_mapping(start, start + size-1);
647 if (last_mapped_pfn > max_pfn_mapped)
648 max_pfn_mapped = last_mapped_pfn;
650 ret = __add_pages(zone, start_pfn, nr_pages);
655 EXPORT_SYMBOL_GPL(arch_add_memory);
657 #if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
658 int memory_add_physaddr_to_nid(u64 start)
662 EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
665 void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
667 tlb_remove_page(tlb, virt_to_page(pud));
670 #endif /* CONFIG_MEMORY_HOTPLUG */
672 static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel,
673 kcore_modules, kcore_vsyscall;
675 void __init mem_init(void)
677 long codesize, reservedpages, datasize, initsize;
681 /* clear_bss() already clear the empty_zero_page */
685 /* this will put all low memory onto the freelists */
687 totalram_pages = numa_free_all_bootmem();
689 totalram_pages = free_all_bootmem();
691 reservedpages = end_pfn - totalram_pages -
692 absent_pages_in_range(0, end_pfn);
695 codesize = (unsigned long) &_etext - (unsigned long) &_text;
696 datasize = (unsigned long) &_edata - (unsigned long) &_etext;
697 initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
699 /* Register memory areas for /proc/kcore */
700 kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
701 kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
702 VMALLOC_END-VMALLOC_START);
703 kclist_add(&kcore_kernel, &_stext, _end - _stext);
704 kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
705 kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START,
706 VSYSCALL_END - VSYSCALL_START);
708 printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
709 "%ldk reserved, %ldk data, %ldk init)\n",
710 (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
711 end_pfn << (PAGE_SHIFT-10),
713 reservedpages << (PAGE_SHIFT-10),
720 void free_init_pages(char *what, unsigned long begin, unsigned long end)
722 unsigned long addr = begin;
728 * If debugging page accesses then do not free this memory but
729 * mark them not present - any buggy init-section access will
730 * create a kernel page fault:
732 #ifdef CONFIG_DEBUG_PAGEALLOC
733 printk(KERN_INFO "debug: unmapping init memory %08lx..%08lx\n",
734 begin, PAGE_ALIGN(end));
735 set_memory_np(begin, (end - begin) >> PAGE_SHIFT);
737 printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
739 for (; addr < end; addr += PAGE_SIZE) {
740 ClearPageReserved(virt_to_page(addr));
741 init_page_count(virt_to_page(addr));
742 memset((void *)(addr & ~(PAGE_SIZE-1)),
743 POISON_FREE_INITMEM, PAGE_SIZE);
750 void free_initmem(void)
752 free_init_pages("unused kernel memory",
753 (unsigned long)(&__init_begin),
754 (unsigned long)(&__init_end));
757 #ifdef CONFIG_DEBUG_RODATA
758 const int rodata_test_data = 0xC3;
759 EXPORT_SYMBOL_GPL(rodata_test_data);
761 void mark_rodata_ro(void)
763 unsigned long start = PFN_ALIGN(_stext), end = PFN_ALIGN(__end_rodata);
765 printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
766 (end - start) >> 10);
767 set_memory_ro(start, (end - start) >> PAGE_SHIFT);
770 * The rodata section (but not the kernel text!) should also be
773 start = ((unsigned long)__start_rodata + PAGE_SIZE - 1) & PAGE_MASK;
774 set_memory_nx(start, (end - start) >> PAGE_SHIFT);
778 #ifdef CONFIG_CPA_DEBUG
779 printk(KERN_INFO "Testing CPA: undo %lx-%lx\n", start, end);
780 set_memory_rw(start, (end-start) >> PAGE_SHIFT);
782 printk(KERN_INFO "Testing CPA: again\n");
783 set_memory_ro(start, (end-start) >> PAGE_SHIFT);
789 #ifdef CONFIG_BLK_DEV_INITRD
790 void free_initrd_mem(unsigned long start, unsigned long end)
792 free_init_pages("initrd memory", start, end);
796 void __init reserve_bootmem_generic(unsigned long phys, unsigned len)
799 int nid = phys_to_nid(phys);
801 unsigned long pfn = phys >> PAGE_SHIFT;
803 if (pfn >= end_pfn) {
805 * This can happen with kdump kernels when accessing
808 if (pfn < max_pfn_mapped)
811 printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
816 /* Should check here against the e820 map to avoid double free */
818 reserve_bootmem_node(NODE_DATA(nid), phys, len, BOOTMEM_DEFAULT);
820 reserve_bootmem(phys, len, BOOTMEM_DEFAULT);
822 if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
823 dma_reserve += len / PAGE_SIZE;
824 set_dma_reserve(dma_reserve);
828 int kern_addr_valid(unsigned long addr)
830 unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
836 if (above != 0 && above != -1UL)
839 pgd = pgd_offset_k(addr);
843 pud = pud_offset(pgd, addr);
847 pmd = pmd_offset(pud, addr);
852 return pfn_valid(pmd_pfn(*pmd));
854 pte = pte_offset_kernel(pmd, addr);
858 return pfn_valid(pte_pfn(*pte));
862 * A pseudo VMA to allow ptrace access for the vsyscall page. This only
863 * covers the 64bit vsyscall page now. 32bit has a real VMA now and does
864 * not need special handling anymore:
866 static struct vm_area_struct gate_vma = {
867 .vm_start = VSYSCALL_START,
868 .vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES * PAGE_SIZE),
869 .vm_page_prot = PAGE_READONLY_EXEC,
870 .vm_flags = VM_READ | VM_EXEC
873 struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
875 #ifdef CONFIG_IA32_EMULATION
876 if (test_tsk_thread_flag(tsk, TIF_IA32))
882 int in_gate_area(struct task_struct *task, unsigned long addr)
884 struct vm_area_struct *vma = get_gate_vma(task);
889 return (addr >= vma->vm_start) && (addr < vma->vm_end);
893 * Use this when you have no reliable task/vma, typically from interrupt
894 * context. It is less reliable than using the task's vma and may give
897 int in_gate_area_no_task(unsigned long addr)
899 return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
902 const char *arch_vma_name(struct vm_area_struct *vma)
904 if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
906 if (vma == &gate_vma)
911 #ifdef CONFIG_SPARSEMEM_VMEMMAP
913 * Initialise the sparsemem vmemmap using huge-pages at the PMD level.
916 vmemmap_populate(struct page *start_page, unsigned long size, int node)
918 unsigned long addr = (unsigned long)start_page;
919 unsigned long end = (unsigned long)(start_page + size);
925 for (; addr < end; addr = next) {
926 next = pmd_addr_end(addr, end);
928 pgd = vmemmap_pgd_populate(addr, node);
932 pud = vmemmap_pud_populate(pgd, addr, node);
936 pmd = pmd_offset(pud, addr);
937 if (pmd_none(*pmd)) {
941 p = vmemmap_alloc_block(PMD_SIZE, node);
945 entry = pfn_pte(__pa(p) >> PAGE_SHIFT,
947 set_pmd(pmd, __pmd(pte_val(entry)));
949 printk(KERN_DEBUG " [%lx-%lx] PMD ->%p on node %d\n",
950 addr, addr + PMD_SIZE - 1, p, node);
952 vmemmap_verify((pte_t *)pmd, node, addr, next);