---
name: "follow_pfn"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/follow_pfn"
---

# follow\_pfn(9)

look up PFN at a user virtual address

## 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.

## COPYRIGHT