x86_64: prepare shared mm/init.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 750 deletions

diff --git a/arch/x86_64/mm/init.c b/arch/x86_64/mm/init.c
deleted file mode 100644
index 458893b376f81..0000000000000
--- a/arch/x86_64/mm/init.c
+++ /dev/null
@@ -1,750 +0,0 @@
-/*
- *  linux/arch/x86_64/mm/init.c
- *
- *  Copyright (C) 1995  Linus Torvalds
- *  Copyright (C) 2000  Pavel Machek <pavel@suse.cz>
- *  Copyright (C) 2002,2003 Andi Kleen <ak@suse.de>
- */
-
-#include <linux/signal.h>
-#include <linux/sched.h>
-#include <linux/kernel.h>
-#include <linux/errno.h>
-#include <linux/string.h>
-#include <linux/types.h>
-#include <linux/ptrace.h>
-#include <linux/mman.h>
-#include <linux/mm.h>
-#include <linux/swap.h>
-#include <linux/smp.h>
-#include <linux/init.h>
-#include <linux/pagemap.h>
-#include <linux/bootmem.h>
-#include <linux/proc_fs.h>
-#include <linux/pci.h>
-#include <linux/pfn.h>
-#include <linux/poison.h>
-#include <linux/dma-mapping.h>
-#include <linux/module.h>
-#include <linux/memory_hotplug.h>
-#include <linux/nmi.h>
-
-#include <asm/processor.h>
-#include <asm/system.h>
-#include <asm/uaccess.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/dma.h>
-#include <asm/fixmap.h>
-#include <asm/e820.h>
-#include <asm/apic.h>
-#include <asm/tlb.h>
-#include <asm/mmu_context.h>
-#include <asm/proto.h>
-#include <asm/smp.h>
-#include <asm/sections.h>
-
-#ifndef Dprintk
-#define Dprintk(x...)
-#endif
-
-const struct dma_mapping_ops* dma_ops;
-EXPORT_SYMBOL(dma_ops);
-
-static unsigned long dma_reserve __initdata;
-
-DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
-
-/*
- * NOTE: pagetable_init alloc all the fixmap pagetables contiguous on the
- * physical space so we can cache the place of the first one and move
- * around without checking the pgd every time.
- */
-
-void show_mem(void)
-{
-	long i, total = 0, reserved = 0;
-	long shared = 0, cached = 0;
-	pg_data_t *pgdat;
-	struct page *page;
-
-	printk(KERN_INFO "Mem-info:\n");
-	show_free_areas();
-	printk(KERN_INFO "Free swap:       %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
-
-	for_each_online_pgdat(pgdat) {
-               for (i = 0; i < pgdat->node_spanned_pages; ++i) {
-			/* this loop can take a while with 256 GB and 4k pages
-			   so update the NMI watchdog */
-			if (unlikely(i % MAX_ORDER_NR_PAGES == 0)) {
-				touch_nmi_watchdog();
-			}
-			if (!pfn_valid(pgdat->node_start_pfn + i))
-				continue;
-			page = pfn_to_page(pgdat->node_start_pfn + i);
-			total++;
-			if (PageReserved(page))
-				reserved++;
-			else if (PageSwapCache(page))
-				cached++;
-			else if (page_count(page))
-				shared += page_count(page) - 1;
-               }
-	}
-	printk(KERN_INFO "%lu pages of RAM\n", total);
-	printk(KERN_INFO "%lu reserved pages\n",reserved);
-	printk(KERN_INFO "%lu pages shared\n",shared);
-	printk(KERN_INFO "%lu pages swap cached\n",cached);
-}
-
-int after_bootmem;
-
-static __init void *spp_getpage(void)
-{ 
-	void *ptr;
-	if (after_bootmem)
-		ptr = (void *) get_zeroed_page(GFP_ATOMIC); 
-	else
-		ptr = alloc_bootmem_pages(PAGE_SIZE);
-	if (!ptr || ((unsigned long)ptr & ~PAGE_MASK))
-		panic("set_pte_phys: cannot allocate page data %s\n", after_bootmem?"after bootmem":"");
-
-	Dprintk("spp_getpage %p\n", ptr);
-	return ptr;
-} 
-
-static __init void set_pte_phys(unsigned long vaddr,
-			 unsigned long phys, pgprot_t prot)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte, new_pte;
-
-	Dprintk("set_pte_phys %lx to %lx\n", vaddr, phys);
-
-	pgd = pgd_offset_k(vaddr);
-	if (pgd_none(*pgd)) {
-		printk("PGD FIXMAP MISSING, it should be setup in head.S!\n");
-		return;
-	}
-	pud = pud_offset(pgd, vaddr);
-	if (pud_none(*pud)) {
-		pmd = (pmd_t *) spp_getpage(); 
-		set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE | _PAGE_USER));
-		if (pmd != pmd_offset(pud, 0)) {
-			printk("PAGETABLE BUG #01! %p <-> %p\n", pmd, pmd_offset(pud,0));
-			return;
-		}
-	}
-	pmd = pmd_offset(pud, vaddr);
-	if (pmd_none(*pmd)) {
-		pte = (pte_t *) spp_getpage();
-		set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE | _PAGE_USER));
-		if (pte != pte_offset_kernel(pmd, 0)) {
-			printk("PAGETABLE BUG #02!\n");
-			return;
-		}
-	}
-	new_pte = pfn_pte(phys >> PAGE_SHIFT, prot);
-
-	pte = pte_offset_kernel(pmd, vaddr);
-	if (!pte_none(*pte) &&
-	    pte_val(*pte) != (pte_val(new_pte) & __supported_pte_mask))
-		pte_ERROR(*pte);
-	set_pte(pte, new_pte);
-
-	/*
-	 * It's enough to flush this one mapping.
-	 * (PGE mappings get flushed as well)
-	 */
-	__flush_tlb_one(vaddr);
-}
-
-/* NOTE: this is meant to be run only at boot */
-void __init 
-__set_fixmap (enum fixed_addresses idx, unsigned long phys, pgprot_t prot)
-{
-	unsigned long address = __fix_to_virt(idx);
-
-	if (idx >= __end_of_fixed_addresses) {
-		printk("Invalid __set_fixmap\n");
-		return;
-	}
-	set_pte_phys(address, phys, prot);
-}
-
-unsigned long __meminitdata table_start, table_end;
-
-static __meminit void *alloc_low_page(unsigned long *phys)
-{ 
-	unsigned long pfn = table_end++;
-	void *adr;
-
-	if (after_bootmem) {
-		adr = (void *)get_zeroed_page(GFP_ATOMIC);
-		*phys = __pa(adr);
-		return adr;
-	}
-
-	if (pfn >= end_pfn) 
-		panic("alloc_low_page: ran out of memory"); 
-
-	adr = early_ioremap(pfn * PAGE_SIZE, PAGE_SIZE);
-	memset(adr, 0, PAGE_SIZE);
-	*phys  = pfn * PAGE_SIZE;
-	return adr;
-}
-
-static __meminit void unmap_low_page(void *adr)
-{ 
-
-	if (after_bootmem)
-		return;
-
-	early_iounmap(adr, PAGE_SIZE);
-} 
-
-/* Must run before zap_low_mappings */
-__meminit void *early_ioremap(unsigned long addr, unsigned long size)
-{
-	unsigned long vaddr;
-	pmd_t *pmd, *last_pmd;
-	int i, pmds;
-
-	pmds = ((addr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
-	vaddr = __START_KERNEL_map;
-	pmd = level2_kernel_pgt;
-	last_pmd = level2_kernel_pgt + PTRS_PER_PMD - 1;
-	for (; pmd <= last_pmd; pmd++, vaddr += PMD_SIZE) {
-		for (i = 0; i < pmds; i++) {
-			if (pmd_present(pmd[i]))
-				goto next;
-		}
-		vaddr += addr & ~PMD_MASK;
-		addr &= PMD_MASK;
-		for (i = 0; i < pmds; i++, addr += PMD_SIZE)
-			set_pmd(pmd + i,__pmd(addr | _KERNPG_TABLE | _PAGE_PSE));
-		__flush_tlb();
-		return (void *)vaddr;
-	next:
-		;
-	}
-	printk("early_ioremap(0x%lx, %lu) failed\n", addr, size);
-	return NULL;
-}
-
-/* To avoid virtual aliases later */
-__meminit void early_iounmap(void *addr, unsigned long size)
-{
-	unsigned long vaddr;
-	pmd_t *pmd;
-	int i, pmds;
-
-	vaddr = (unsigned long)addr;
-	pmds = ((vaddr & ~PMD_MASK) + size + ~PMD_MASK) / PMD_SIZE;
-	pmd = level2_kernel_pgt + pmd_index(vaddr);
-	for (i = 0; i < pmds; i++)
-		pmd_clear(pmd + i);
-	__flush_tlb();
-}
-
-static void __meminit
-phys_pmd_init(pmd_t *pmd_page, unsigned long address, unsigned long end)
-{
-	int i = pmd_index(address);
-
-	for (; i < PTRS_PER_PMD; i++, address += PMD_SIZE) {
-		unsigned long entry;
-		pmd_t *pmd = pmd_page + pmd_index(address);
-
-		if (address >= end) {
-			if (!after_bootmem)
-				for (; i < PTRS_PER_PMD; i++, pmd++)
-					set_pmd(pmd, __pmd(0));
-			break;
-		}
-
-		if (pmd_val(*pmd))
-			continue;
-
-		entry = _PAGE_NX|_PAGE_PSE|_KERNPG_TABLE|_PAGE_GLOBAL|address;
-		entry &= __supported_pte_mask;
-		set_pmd(pmd, __pmd(entry));
-	}
-}
-
-static void __meminit
-phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
-{
-	pmd_t *pmd = pmd_offset(pud,0);
-	spin_lock(&init_mm.page_table_lock);
-	phys_pmd_init(pmd, address, end);
-	spin_unlock(&init_mm.page_table_lock);
-	__flush_tlb_all();
-}
-
-static void __meminit phys_pud_init(pud_t *pud_page, unsigned long addr, unsigned long end)
-{ 
-	int i = pud_index(addr);
-
-
-	for (; i < PTRS_PER_PUD; i++, addr = (addr & PUD_MASK) + PUD_SIZE ) {
-		unsigned long pmd_phys;
-		pud_t *pud = pud_page + pud_index(addr);
-		pmd_t *pmd;
-
-		if (addr >= end)
-			break;
-
-		if (!after_bootmem && !e820_any_mapped(addr,addr+PUD_SIZE,0)) {
-			set_pud(pud, __pud(0)); 
-			continue;
-		} 
-
-		if (pud_val(*pud)) {
-			phys_pmd_update(pud, addr, end);
-			continue;
-		}
-
-		pmd = alloc_low_page(&pmd_phys);
-		spin_lock(&init_mm.page_table_lock);
-		set_pud(pud, __pud(pmd_phys | _KERNPG_TABLE));
-		phys_pmd_init(pmd, addr, end);
-		spin_unlock(&init_mm.page_table_lock);
-		unmap_low_page(pmd);
-	}
-	__flush_tlb();
-} 
-
-static void __init find_early_table_space(unsigned long end)
-{
-	unsigned long puds, pmds, tables, start;
-
-	puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
-	pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
-	tables = round_up(puds * sizeof(pud_t), PAGE_SIZE) +
-		 round_up(pmds * sizeof(pmd_t), PAGE_SIZE);
-
- 	/* RED-PEN putting page tables only on node 0 could
- 	   cause a hotspot and fill up ZONE_DMA. The page tables
- 	   need roughly 0.5KB per GB. */
- 	start = 0x8000;
- 	table_start = find_e820_area(start, end, tables);
-	if (table_start == -1UL)
-		panic("Cannot find space for the kernel page tables");
-
-	table_start >>= PAGE_SHIFT;
-	table_end = table_start;
-
-	early_printk("kernel direct mapping tables up to %lx @ %lx-%lx\n",
-		end, table_start << PAGE_SHIFT,
-		(table_start << PAGE_SHIFT) + tables);
-}
-
-/* Setup the direct mapping of the physical memory at PAGE_OFFSET.
-   This runs before bootmem is initialized and gets pages directly from the 
-   physical memory. To access them they are temporarily mapped. */
-void __meminit init_memory_mapping(unsigned long start, unsigned long end)
-{ 
-	unsigned long next; 
-
-	Dprintk("init_memory_mapping\n");
-
-	/* 
-	 * Find space for the kernel direct mapping tables.
-	 * Later we should allocate these tables in the local node of the memory
-	 * mapped.  Unfortunately this is done currently before the nodes are 
-	 * discovered.
-	 */
-	if (!after_bootmem)
-		find_early_table_space(end);
-
-	start = (unsigned long)__va(start);
-	end = (unsigned long)__va(end);
-
-	for (; start < end; start = next) {
-		unsigned long pud_phys; 
-		pgd_t *pgd = pgd_offset_k(start);
-		pud_t *pud;
-
-		if (after_bootmem)
-			pud = pud_offset(pgd, start & PGDIR_MASK);
-		else
-			pud = alloc_low_page(&pud_phys);
-
-		next = start + PGDIR_SIZE;
-		if (next > end) 
-			next = end; 
-		phys_pud_init(pud, __pa(start), __pa(next));
-		if (!after_bootmem)
-			set_pgd(pgd_offset_k(start), mk_kernel_pgd(pud_phys));
-		unmap_low_page(pud);
-	} 
-
-	if (!after_bootmem)
-		mmu_cr4_features = read_cr4();
-	__flush_tlb_all();
-}
-
-#ifndef CONFIG_NUMA
-void __init paging_init(void)
-{
-	unsigned long max_zone_pfns[MAX_NR_ZONES];
-	memset(max_zone_pfns, 0, sizeof(max_zone_pfns));
-	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
-	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
-	max_zone_pfns[ZONE_NORMAL] = end_pfn;
-
-	memory_present(0, 0, end_pfn);
-	sparse_init();
-	free_area_init_nodes(max_zone_pfns);
-}
-#endif
-
-/* Unmap a kernel mapping if it exists. This is useful to avoid prefetches
-   from the CPU leading to inconsistent cache lines. address and size
-   must be aligned to 2MB boundaries. 
-   Does nothing when the mapping doesn't exist. */
-void __init clear_kernel_mapping(unsigned long address, unsigned long size) 
-{
-	unsigned long end = address + size;
-
-	BUG_ON(address & ~LARGE_PAGE_MASK);
-	BUG_ON(size & ~LARGE_PAGE_MASK); 
-	
-	for (; address < end; address += LARGE_PAGE_SIZE) { 
-		pgd_t *pgd = pgd_offset_k(address);
-		pud_t *pud;
-		pmd_t *pmd;
-		if (pgd_none(*pgd))
-			continue;
-		pud = pud_offset(pgd, address);
-		if (pud_none(*pud))
-			continue; 
-		pmd = pmd_offset(pud, address);
-		if (!pmd || pmd_none(*pmd))
-			continue; 
-		if (0 == (pmd_val(*pmd) & _PAGE_PSE)) { 
-			/* Could handle this, but it should not happen currently. */
-			printk(KERN_ERR 
-	       "clear_kernel_mapping: mapping has been split. will leak memory\n"); 
-			pmd_ERROR(*pmd); 
-		}
-		set_pmd(pmd, __pmd(0)); 		
-	}
-	__flush_tlb_all();
-} 
-
-/*
- * Memory hotplug specific functions
- */
-void online_page(struct page *page)
-{
-	ClearPageReserved(page);
-	init_page_count(page);
-	__free_page(page);
-	totalram_pages++;
-	num_physpages++;
-}
-
-#ifdef CONFIG_MEMORY_HOTPLUG
-/*
- * Memory is added always to NORMAL zone. This means you will never get
- * additional DMA/DMA32 memory.
- */
-int arch_add_memory(int nid, u64 start, u64 size)
-{
-	struct pglist_data *pgdat = NODE_DATA(nid);
-	struct zone *zone = pgdat->node_zones + ZONE_NORMAL;
-	unsigned long start_pfn = start >> PAGE_SHIFT;
-	unsigned long nr_pages = size >> PAGE_SHIFT;
-	int ret;
-
-	init_memory_mapping(start, (start + size -1));
-
-	ret = __add_pages(zone, start_pfn, nr_pages);
-	if (ret)
-		goto error;
-
-	return ret;
-error:
-	printk("%s: Problem encountered in __add_pages!\n", __func__);
-	return ret;
-}
-EXPORT_SYMBOL_GPL(arch_add_memory);
-
-int remove_memory(u64 start, u64 size)
-{
-	return -EINVAL;
-}
-EXPORT_SYMBOL_GPL(remove_memory);
-
-#if !defined(CONFIG_ACPI_NUMA) && defined(CONFIG_NUMA)
-int memory_add_physaddr_to_nid(u64 start)
-{
-	return 0;
-}
-EXPORT_SYMBOL_GPL(memory_add_physaddr_to_nid);
-#endif
-
-#endif /* CONFIG_MEMORY_HOTPLUG */
-
-#ifdef CONFIG_MEMORY_HOTPLUG_RESERVE
-/*
- * Memory Hotadd without sparsemem. The mem_maps have been allocated in advance,
- * just online the pages.
- */
-int __add_pages(struct zone *z, unsigned long start_pfn, unsigned long nr_pages)
-{
-	int err = -EIO;
-	unsigned long pfn;
-	unsigned long total = 0, mem = 0;
-	for (pfn = start_pfn; pfn < start_pfn + nr_pages; pfn++) {
-		if (pfn_valid(pfn)) {
-			online_page(pfn_to_page(pfn));
-			err = 0;
-			mem++;
-		}
-		total++;
-	}
-	if (!err) {
-		z->spanned_pages += total;
-		z->present_pages += mem;
-		z->zone_pgdat->node_spanned_pages += total;
-		z->zone_pgdat->node_present_pages += mem;
-	}
-	return err;
-}
-#endif
-
-static struct kcore_list kcore_mem, kcore_vmalloc, kcore_kernel, kcore_modules,
-			 kcore_vsyscall;
-
-void __init mem_init(void)
-{
-	long codesize, reservedpages, datasize, initsize;
-
-	pci_iommu_alloc();
-
-	/* clear the zero-page */
-	memset(empty_zero_page, 0, PAGE_SIZE);
-
-	reservedpages = 0;
-
-	/* this will put all low memory onto the freelists */
-#ifdef CONFIG_NUMA
-	totalram_pages = numa_free_all_bootmem();
-#else
-	totalram_pages = free_all_bootmem();
-#endif
-	reservedpages = end_pfn - totalram_pages -
-					absent_pages_in_range(0, end_pfn);
-
-	after_bootmem = 1;
-
-	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
-	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
-	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;
-
-	/* Register memory areas for /proc/kcore */
-	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT); 
-	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START, 
-		   VMALLOC_END-VMALLOC_START);
-	kclist_add(&kcore_kernel, &_stext, _end - _stext);
-	kclist_add(&kcore_modules, (void *)MODULES_VADDR, MODULES_LEN);
-	kclist_add(&kcore_vsyscall, (void *)VSYSCALL_START, 
-				 VSYSCALL_END - VSYSCALL_START);
-
-	printk("Memory: %luk/%luk available (%ldk kernel code, %ldk reserved, %ldk data, %ldk init)\n",
-		(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
-		end_pfn << (PAGE_SHIFT-10),
-		codesize >> 10,
-		reservedpages << (PAGE_SHIFT-10),
-		datasize >> 10,
-		initsize >> 10);
-}
-
-void free_init_pages(char *what, unsigned long begin, unsigned long end)
-{
-	unsigned long addr;
-
-	if (begin >= end)
-		return;
-
-	printk(KERN_INFO "Freeing %s: %luk freed\n", what, (end - begin) >> 10);
-	for (addr = begin; addr < end; addr += PAGE_SIZE) {
-		ClearPageReserved(virt_to_page(addr));
-		init_page_count(virt_to_page(addr));
-		memset((void *)(addr & ~(PAGE_SIZE-1)),
-			POISON_FREE_INITMEM, PAGE_SIZE);
-		if (addr >= __START_KERNEL_map)
-			change_page_attr_addr(addr, 1, __pgprot(0));
-		free_page(addr);
-		totalram_pages++;
-	}
-	if (addr > __START_KERNEL_map)
-		global_flush_tlb();
-}
-
-void free_initmem(void)
-{
-	free_init_pages("unused kernel memory",
-			(unsigned long)(&__init_begin),
-			(unsigned long)(&__init_end));
-}
-
-#ifdef CONFIG_DEBUG_RODATA
-
-void mark_rodata_ro(void)
-{
-	unsigned long start = (unsigned long)_stext, end;
-
-#ifdef CONFIG_HOTPLUG_CPU
-	/* It must still be possible to apply SMP alternatives. */
-	if (num_possible_cpus() > 1)
-		start = (unsigned long)_etext;
-#endif
-
-#ifdef CONFIG_KPROBES
-	start = (unsigned long)__start_rodata;
-#endif
-	
-	end = (unsigned long)__end_rodata;
-	start = (start + PAGE_SIZE - 1) & PAGE_MASK;
-	end &= PAGE_MASK;
-	if (end <= start)
-		return;
-
-	change_page_attr_addr(start, (end - start) >> PAGE_SHIFT, PAGE_KERNEL_RO);
-
-	printk(KERN_INFO "Write protecting the kernel read-only data: %luk\n",
-	       (end - start) >> 10);
-
-	/*
-	 * change_page_attr_addr() requires a global_flush_tlb() call after it.
-	 * We do this after the printk so that if something went wrong in the
-	 * change, the printk gets out at least to give a better debug hint
-	 * of who is the culprit.
-	 */
-	global_flush_tlb();
-}
-#endif
-
-#ifdef CONFIG_BLK_DEV_INITRD
-void free_initrd_mem(unsigned long start, unsigned long end)
-{
-	free_init_pages("initrd memory", start, end);
-}
-#endif
-
-void __init reserve_bootmem_generic(unsigned long phys, unsigned len) 
-{ 
-#ifdef CONFIG_NUMA
-	int nid = phys_to_nid(phys);
-#endif
-	unsigned long pfn = phys >> PAGE_SHIFT;
-	if (pfn >= end_pfn) {
-		/* This can happen with kdump kernels when accessing firmware
-		   tables. */
-		if (pfn < end_pfn_map)
-			return;
-		printk(KERN_ERR "reserve_bootmem: illegal reserve %lx %u\n",
-				phys, len);
-		return;
-	}
-
-	/* Should check here against the e820 map to avoid double free */
-#ifdef CONFIG_NUMA
-  	reserve_bootmem_node(NODE_DATA(nid), phys, len);
-#else       		
-	reserve_bootmem(phys, len);    
-#endif
-	if (phys+len <= MAX_DMA_PFN*PAGE_SIZE) {
-		dma_reserve += len / PAGE_SIZE;
-		set_dma_reserve(dma_reserve);
-	}
-}
-
-int kern_addr_valid(unsigned long addr) 
-{ 
-	unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
-       pgd_t *pgd;
-       pud_t *pud;
-       pmd_t *pmd;
-       pte_t *pte;
-
-	if (above != 0 && above != -1UL)
-		return 0; 
-	
-	pgd = pgd_offset_k(addr);
-	if (pgd_none(*pgd))
-		return 0;
-
-	pud = pud_offset(pgd, addr);
-	if (pud_none(*pud))
-		return 0; 
-
-	pmd = pmd_offset(pud, addr);
-	if (pmd_none(*pmd))
-		return 0;
-	if (pmd_large(*pmd))
-		return pfn_valid(pmd_pfn(*pmd));
-
-	pte = pte_offset_kernel(pmd, addr);
-	if (pte_none(*pte))
-		return 0;
-	return pfn_valid(pte_pfn(*pte));
-}
-
-/* A pseudo VMA to allow ptrace access for the vsyscall page.  This only
-   covers the 64bit vsyscall page now. 32bit has a real VMA now and does
-   not need special handling anymore. */
-
-static struct vm_area_struct gate_vma = {
-	.vm_start = VSYSCALL_START,
-	.vm_end = VSYSCALL_START + (VSYSCALL_MAPPED_PAGES << PAGE_SHIFT),
-	.vm_page_prot = PAGE_READONLY_EXEC,
-	.vm_flags = VM_READ | VM_EXEC
-};
-
-struct vm_area_struct *get_gate_vma(struct task_struct *tsk)
-{
-#ifdef CONFIG_IA32_EMULATION
-	if (test_tsk_thread_flag(tsk, TIF_IA32))
-		return NULL;
-#endif
-	return &gate_vma;
-}
-
-int in_gate_area(struct task_struct *task, unsigned long addr)
-{
-	struct vm_area_struct *vma = get_gate_vma(task);
-	if (!vma)
-		return 0;
-	return (addr >= vma->vm_start) && (addr < vma->vm_end);
-}
-
-/* Use this when you have no reliable task/vma, typically from interrupt
- * context.  It is less reliable than using the task's vma and may give
- * false positives.
- */
-int in_gate_area_no_task(unsigned long addr)
-{
-	return (addr >= VSYSCALL_START) && (addr < VSYSCALL_END);
-}
-
-void * __init alloc_bootmem_high_node(pg_data_t *pgdat, unsigned long size)
-{
-	return __alloc_bootmem_core(pgdat->bdata, size,
-			SMP_CACHE_BYTES, (4UL*1024*1024*1024), 0);
-}
-
-const char *arch_vma_name(struct vm_area_struct *vma)
-{
-	if (vma->vm_mm && vma->vm_start == (long)vma->vm_mm->context.vdso)
-		return "[vdso]";
-	if (vma == &gate_vma)
-		return "[vsyscall]";
-	return NULL;
-}