'\" t
.\"     Title: vm_insert_pfn_prot
.\"    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 "VM_INSERT_PFN_PROT" "9" "March 2017" "Kernel Hackers Manual 4\&.10\&" "Memory Management in Linux"
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.SH "NAME"
vm_insert_pfn_prot \- insert single pfn into user vma with specified pgprot
.SH "SYNOPSIS"
.HP \w'int\ vm_insert_pfn_prot('u
.BI "int vm_insert_pfn_prot(struct\ vm_area_struct\ *\ " "vma" ", unsigned\ long\ " "addr" ", unsigned\ long\ " "pfn" ", pgprot_t\ " "pgprot" ");"
.SH "ARGUMENTS"
.PP
\fIvma\fR
.RS 4
user vma to map to
.RE
.PP
\fIaddr\fR
.RS 4
target user address of this page
.RE
.PP
\fIpfn\fR
.RS 4
source kernel pfn
.RE
.PP
\fIpgprot\fR
.RS 4
pgprot flags for the inserted page
.RE
.SH "DESCRIPTION"
.PP
This is exactly like vm_insert_pfn, except that it allows drivers to to override pgprot on a per\-page basis\&.
.PP
This only makes sense for IO mappings, and it makes no sense for cow mappings\&. In general, using multiple vmas is preferable; vm_insert_pfn_prot should only be used if using multiple VMAs is impractical\&.
.SH "COPYRIGHT"
.br