vm_insert_pfn
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## Name

vm_insert_pfn — insert single pfn into user vma

## Synopsis

`int vm_insert_pfn (` | struct vm_area_struct * vma,
| unsigned long addr,
| unsigned long pfn`)`;

## Arguments

`vma`

  user vma to map to

`addr`

  target user address of this page

`pfn`

  source kernel pfn

## Description

Similar to vm_insert_page, this allows drivers to insert individual pages they've allocated into a user vma. Same comments apply.

This function should only be called from a vm_ops->fault handler, and in that case the handler should return NULL.

vma cannot be a COW mapping.

As this is called only for pages that do not currently exist, we do not need to flush old virtual caches or the TLB.

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