1VM_INSERT_PAGE(9)         Memory Management in Linux         VM_INSERT_PAGE(9)
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NAME

6       vm_insert_page - insert single page into user vma
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SYNOPSIS

9       int vm_insert_page(struct vm_area_struct * vma, unsigned long addr,
10                          struct page * page);
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ARGUMENTS

13       vma
14           user vma to map to
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16       addr
17           target user address of this page
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19       page
20           source kernel page
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DESCRIPTION

23       This allows drivers to insert individual pages they've allocated into a
24       user vma.
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26       The page has to be a nice clean _individual_ kernel allocation. If you
27       allocate a compound page, you need to have marked it as such
28       (__GFP_COMP), or manually just split the page up yourself (see
29       split_page).
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31       NOTE! Traditionally this was done with “remap_pfn_range” which took an
32       arbitrary page protection parameter. This doesn't allow that. Your vma
33       protection will have to be set up correctly, which means that if you
34       want a shared writable mapping, you'd better ask for a shared writable
35       mapping!
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37       The page does not need to be reserved.
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39       Usually this function is called from f_op->mmap handler under
40       mm->mmap_sem write-lock, so it can change vma->vm_flags. Caller must
41       set VM_MIXEDMAP on vma if it wants to call this function from other
42       places, for example from page-fault handler.
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45Kernel Hackers Manual 3.10         June 2019                 VM_INSERT_PAGE(9)
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