1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>free_area_init_nodes</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="The Linux Kernel API"><link rel="up" href="ch04s03.html" title="More Memory Management Functions"><link rel="prev" href="API-find-min-pfn-with-active-regions.html" title="find_min_pfn_with_active_regions"><link rel="next" href="API-set-dma-reserve.html" title="set_dma_reserve"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span class="phrase">free_area_init_nodes</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-find-min-pfn-with-active-regions.html">Prev</a>&#160;</td><th width="60%" align="center">More Memory Management Functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-set-dma-reserve.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-free-area-init-nodes"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>free_area_init_nodes &#8212; 
2     Initialise all pg_data_t and zone data
3 </p></div><div class="refsynopsisdiv"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" class="funcprototype-table" summary="Function synopsis" style="cellspacing: 0; cellpadding: 0;"><tr><td><code class="funcdef">void <b class="fsfunc">free_area_init_nodes </b>(</code></td><td>unsigned long * <var class="pdparam">max_zone_pfn</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124603604"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>max_zone_pfn</code></em></span></dt><dd><p>
4     an array of max PFNs for each zone
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124605244"></a><h2>Description</h2><p>
6   This will call <code class="function">free_area_init_node</code> for each active node in the system.
7   Using the page ranges provided by <code class="function">memblock_set_node</code>, the size of each
8   zone in each node and their holes is calculated. If the maximum PFN
9   between two adjacent zones match, it is assumed that the zone is empty.
10   For example, if arch_max_dma_pfn == arch_max_dma32_pfn, it is assumed
11   that arch_max_dma32_pfn has no pages. It is also assumed that a zone
12   starts where the previous one ended. For example, ZONE_DMA32 starts
13   at arch_max_dma_pfn.
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