follow_pfn
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## Name

follow_pfn — look up PFN at a user virtual address

## Synopsis

`int follow_pfn (` | struct vm_area_struct * vma,
| unsigned long address,
| unsigned long * pfn`)`;

## Arguments

`vma`

  memory mapping

`address`

  user virtual address

`pfn`

  location to store found PFN

## Description

Only IO mappings and raw PFN mappings are allowed.

Returns zero and the pfn at `pfn` on success, -ve otherwise.

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