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c920745e69
Older UltraSPARC chips had an address space hole due to the MMU only supporting 44-bit virtual addresses. The top end of this hole also has the same value as the current definition of PAGE_OFFSET, so this can be confusing. Consolidate the defines for the userspace mmap exclusion range into page_64.h and use them in sys_sparc_64.c and hugetlbpage.c Signed-off-by: David S. Miller <davem@davemloft.net> Acked-by: Bob Picco <bob.picco@oracle.com>
245 lines
5.2 KiB
C
245 lines
5.2 KiB
C
/*
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* SPARC64 Huge TLB page support.
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*
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* Copyright (C) 2002, 2003, 2006 David S. Miller (davem@davemloft.net)
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/sysctl.h>
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#include <asm/mman.h>
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#include <asm/pgalloc.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/cacheflush.h>
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#include <asm/mmu_context.h>
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/* Slightly simplified from the non-hugepage variant because by
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* definition we don't have to worry about any page coloring stuff
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*/
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static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *filp,
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unsigned long addr,
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unsigned long len,
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unsigned long pgoff,
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unsigned long flags)
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{
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unsigned long task_size = TASK_SIZE;
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struct vm_unmapped_area_info info;
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if (test_thread_flag(TIF_32BIT))
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task_size = STACK_TOP32;
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info.flags = 0;
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info.length = len;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = min(task_size, VA_EXCLUDE_START);
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info.align_mask = PAGE_MASK & ~HPAGE_MASK;
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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if ((addr & ~PAGE_MASK) && task_size > VA_EXCLUDE_END) {
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VM_BUG_ON(addr != -ENOMEM);
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info.low_limit = VA_EXCLUDE_END;
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info.high_limit = task_size;
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addr = vm_unmapped_area(&info);
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}
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return addr;
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}
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static unsigned long
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hugetlb_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
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const unsigned long len,
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const unsigned long pgoff,
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const unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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unsigned long addr = addr0;
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struct vm_unmapped_area_info info;
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/* This should only ever run for 32-bit processes. */
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BUG_ON(!test_thread_flag(TIF_32BIT));
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = PAGE_SIZE;
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info.high_limit = mm->mmap_base;
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info.align_mask = PAGE_MASK & ~HPAGE_MASK;
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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/*
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* A failed mmap() very likely causes application failure,
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* so fall back to the bottom-up function here. This scenario
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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if (addr & ~PAGE_MASK) {
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VM_BUG_ON(addr != -ENOMEM);
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info.flags = 0;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = STACK_TOP32;
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addr = vm_unmapped_area(&info);
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}
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return addr;
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}
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unsigned long
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hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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unsigned long task_size = TASK_SIZE;
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if (test_thread_flag(TIF_32BIT))
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task_size = STACK_TOP32;
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if (len & ~HPAGE_MASK)
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return -EINVAL;
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if (len > task_size)
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return -ENOMEM;
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if (flags & MAP_FIXED) {
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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if (addr) {
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addr = ALIGN(addr, HPAGE_SIZE);
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vma = find_vma(mm, addr);
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if (task_size - len >= addr &&
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(!vma || addr + len <= vma->vm_start))
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return addr;
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}
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if (mm->get_unmapped_area == arch_get_unmapped_area)
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return hugetlb_get_unmapped_area_bottomup(file, addr, len,
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pgoff, flags);
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else
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return hugetlb_get_unmapped_area_topdown(file, addr, len,
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pgoff, flags);
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}
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pte_t *huge_pte_alloc(struct mm_struct *mm,
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unsigned long addr, unsigned long sz)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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/* We must align the address, because our caller will run
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* set_huge_pte_at() on whatever we return, which writes out
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* all of the sub-ptes for the hugepage range. So we have
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* to give it the first such sub-pte.
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*/
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addr &= HPAGE_MASK;
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pgd = pgd_offset(mm, addr);
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pud = pud_alloc(mm, pgd, addr);
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if (pud) {
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pmd = pmd_alloc(mm, pud, addr);
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if (pmd)
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pte = pte_alloc_map(mm, NULL, pmd, addr);
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}
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return pte;
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}
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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{
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pgd_t *pgd;
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pud_t *pud;
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pmd_t *pmd;
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pte_t *pte = NULL;
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addr &= HPAGE_MASK;
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pgd = pgd_offset(mm, addr);
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if (!pgd_none(*pgd)) {
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pud = pud_offset(pgd, addr);
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if (!pud_none(*pud)) {
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pmd = pmd_offset(pud, addr);
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if (!pmd_none(*pmd))
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pte = pte_offset_map(pmd, addr);
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}
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}
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return pte;
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}
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int huge_pmd_unshare(struct mm_struct *mm, unsigned long *addr, pte_t *ptep)
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{
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return 0;
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}
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void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t entry)
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{
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int i;
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if (!pte_present(*ptep) && pte_present(entry))
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mm->context.huge_pte_count++;
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addr &= HPAGE_MASK;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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set_pte_at(mm, addr, ptep, entry);
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ptep++;
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addr += PAGE_SIZE;
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pte_val(entry) += PAGE_SIZE;
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}
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}
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pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep)
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{
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pte_t entry;
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int i;
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entry = *ptep;
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if (pte_present(entry))
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mm->context.huge_pte_count--;
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addr &= HPAGE_MASK;
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for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) {
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pte_clear(mm, addr, ptep);
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addr += PAGE_SIZE;
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ptep++;
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}
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return entry;
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}
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struct page *follow_huge_addr(struct mm_struct *mm,
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unsigned long address, int write)
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{
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return ERR_PTR(-EINVAL);
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}
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int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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int pud_huge(pud_t pud)
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{
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return 0;
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}
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int pmd_huge_support(void)
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{
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return 0;
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}
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struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
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pmd_t *pmd, int write)
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{
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return NULL;
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}
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