memory.c (b3b9c2932c32e0692018ed5f12f3fd8c70eea8ce) memory.c (4b6e1e37026ec7dae9b23d78ffcebdd5ddb1bfa1)
1/*
2 * linux/mm/memory.c
3 *
4 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
5 */
6
7/*
8 * demand-loading started 01.12.91 - seems it is high on the list of

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1042 int ret;
1043
1044 /*
1045 * Don't copy ptes where a page fault will fill them correctly.
1046 * Fork becomes much lighter when there are big shared or private
1047 * readonly mappings. The tradeoff is that copy_page_range is more
1048 * efficient than faulting.
1049 */
1/*
2 * linux/mm/memory.c
3 *
4 * Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
5 */
6
7/*
8 * demand-loading started 01.12.91 - seems it is high on the list of

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1042 int ret;
1043
1044 /*
1045 * Don't copy ptes where a page fault will fill them correctly.
1046 * Fork becomes much lighter when there are big shared or private
1047 * readonly mappings. The tradeoff is that copy_page_range is more
1048 * efficient than faulting.
1049 */
1050 if (!(vma->vm_flags & (VM_HUGETLB|VM_NONLINEAR|VM_PFNMAP|VM_INSERTPAGE))) {
1050 if (!(vma->vm_flags & (VM_HUGETLB | VM_NONLINEAR |
1051 VM_PFNMAP | VM_MIXEDMAP))) {
1051 if (!vma->anon_vma)
1052 return 0;
1053 }
1054
1055 if (is_vm_hugetlb_page(vma))
1056 return copy_hugetlb_page_range(dst_mm, src_mm, vma);
1057
1058 if (unlikely(vma->vm_flags & VM_PFNMAP)) {

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2080 *
2081 * NOTE! Traditionally this was done with "remap_pfn_range()" which
2082 * took an arbitrary page protection parameter. This doesn't allow
2083 * that. Your vma protection will have to be set up correctly, which
2084 * means that if you want a shared writable mapping, you'd better
2085 * ask for a shared writable mapping!
2086 *
2087 * The page does not need to be reserved.
1052 if (!vma->anon_vma)
1053 return 0;
1054 }
1055
1056 if (is_vm_hugetlb_page(vma))
1057 return copy_hugetlb_page_range(dst_mm, src_mm, vma);
1058
1059 if (unlikely(vma->vm_flags & VM_PFNMAP)) {

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2081 *
2082 * NOTE! Traditionally this was done with "remap_pfn_range()" which
2083 * took an arbitrary page protection parameter. This doesn't allow
2084 * that. Your vma protection will have to be set up correctly, which
2085 * means that if you want a shared writable mapping, you'd better
2086 * ask for a shared writable mapping!
2087 *
2088 * The page does not need to be reserved.
2089 *
2090 * Usually this function is called from f_op->mmap() handler
2091 * under mm->mmap_sem write-lock, so it can change vma->vm_flags.
2092 * Caller must set VM_MIXEDMAP on vma if it wants to call this
2093 * function from other places, for example from page-fault handler.
2088 */
2089int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
2090 struct page *page)
2091{
2092 if (addr < vma->vm_start || addr >= vma->vm_end)
2093 return -EFAULT;
2094 if (!page_count(page))
2095 return -EINVAL;
2094 */
2095int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
2096 struct page *page)
2097{
2098 if (addr < vma->vm_start || addr >= vma->vm_end)
2099 return -EFAULT;
2100 if (!page_count(page))
2101 return -EINVAL;
2096 vma->vm_flags |= VM_INSERTPAGE;
2102 if (!(vma->vm_flags & VM_MIXEDMAP)) {
2103 BUG_ON(down_read_trylock(&vma->vm_mm->mmap_sem));
2104 BUG_ON(vma->vm_flags & VM_PFNMAP);
2105 vma->vm_flags |= VM_MIXEDMAP;
2106 }
2097 return insert_page(vma, addr, page, vma->vm_page_prot);
2098}
2099EXPORT_SYMBOL(vm_insert_page);
2100
2101static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2102 unsigned long pfn, pgprot_t prot)
2103{
2104 struct mm_struct *mm = vma->vm_mm;

--- 1927 unchanged lines hidden --- 		2107 return insert_page(vma, addr, page, vma->vm_page_prot);
2108}
2109EXPORT_SYMBOL(vm_insert_page);
2110
2111static int insert_pfn(struct vm_area_struct *vma, unsigned long addr,
2112 unsigned long pfn, pgprot_t prot)
2113{
2114 struct mm_struct *mm = vma->vm_mm;

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