'\" t
.\"     Title: alloc_contig_range
.\"    Author: [FIXME: author] [see http://docbook.sf.net/el/author]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\"      Date: January 2017
.\"    Manual: Memory Management in Linux
.\"    Source: Kernel Hackers Manual 4.8.15
.\"  Language: English
.\"
.TH "ALLOC_CONTIG_RANGE" "9" "January 2017" "Kernel Hackers Manual 4\&.8\&." "Memory Management in Linux"
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.SH "NAME"
alloc_contig_range \- \- tries to allocate given range of pages
.SH "SYNOPSIS"
.HP \w'int\ alloc_contig_range('u
.BI "int alloc_contig_range(unsigned\ long\ " "start" ", unsigned\ long\ " "end" ", unsigned\ " "migratetype" ");"
.SH "ARGUMENTS"
.PP
\fIstart\fR
.RS 4
start PFN to allocate
.RE
.PP
\fIend\fR
.RS 4
one\-past\-the\-last PFN to allocate
.RE
.PP
\fImigratetype\fR
.RS 4
migratetype of the underlaying pageblocks (either #MIGRATE_MOVABLE or #MIGRATE_CMA)\&. All pageblocks in range must have the same migratetype and it must be either of the two\&.
.RE
.SH "DESCRIPTION"
.PP
The PFN range does not have to be pageblock or MAX_ORDER_NR_PAGES aligned, however it\*(Aqs the caller\*(Aqs responsibility to guarantee that we are the only thread that changes migrate type of pageblocks the pages fall in\&.
.PP
The PFN range must belong to a single zone\&.
.PP
Returns zero on success or negative error code\&. On success all pages which PFN is in [start, end) are allocated for the caller and need to be freed with
\fBfree_contig_range\fR\&.
.SH "COPYRIGHT"
.br