'\" t
.\"     Title: follow_pfn
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: March 2017
.\"    Manual: Memory Management in Linux
.\"    Source: Kernel Hackers Manual 4.10.7
.\"  Language: English
.\"
.TH "FOLLOW_PFN" "9" "March 2017" "Kernel Hackers Manual 4\&.10\&" "Memory Management in Linux"
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.SH "NAME"
follow_pfn \- look up PFN at a user virtual address
.SH "SYNOPSIS"
.HP \w'int\ follow_pfn('u
.BI "int follow_pfn(struct\ vm_area_struct\ *\ " "vma" ", unsigned\ long\ " "address" ", unsigned\ long\ *\ " "pfn" ");"
.SH "ARGUMENTS"
.PP
\fIvma\fR
.RS 4
memory mapping
.RE
.PP
\fIaddress\fR
.RS 4
user virtual address
.RE
.PP
\fIpfn\fR
.RS 4
location to store found PFN
.RE
.SH "DESCRIPTION"
.PP
Only IO mappings and raw PFN mappings are allowed\&.
.PP
Returns zero and the pfn at
\fIpfn\fR
on success, \-ve otherwise\&.
.SH "COPYRIGHT"
.br