<?xml version="1.0" encoding="ANSI_X3.4-1968" standalone="no"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968" /><title>mtrr_del</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="The Linux Kernel API" /><link rel="up" href="ch09s04.html" title="MTRR Handling" /><link rel="prev" href="re320.html" title="mtrr_add" /><link rel="next" href="ch09s05.html" title="PCI Support Library" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>mtrr_del</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re320.html">Prev</a> </td><th width="60%" align="center">MTRR Handling</th><td width="20%" align="right"> <a accesskey="n" href="ch09s05.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="mtrr_del"><a id="API-mtrr-del"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mtrr_del — delete a memory type region </p></div><div class="refsynopsisdiv" title="Synopsis"><h2>Synopsis</h2><div class="funcsynopsis"><table border="0" summary="Function synopsis" cellspacing="0" cellpadding="0" class="funcprototype-table"><tr><td><code class="funcdef">int <b class="fsfunc">mtrr_del </b>(</code></td><td>int <var class="pdparam">reg</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">base</var>, </td></tr><tr><td> </td><td>unsigned long <var class="pdparam">size</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2667997"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>reg</code></em></span></dt><dd><p> Register returned by mtrr_add </p></dd><dt><span class="term"><em class="parameter"><code>base</code></em></span></dt><dd><p> Physical base address </p></dd><dt><span class="term"><em class="parameter"><code>size</code></em></span></dt><dd><p> Size of region </p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2668058"></a><h2>Description</h2><p> If register is supplied then base and size are ignored. This is how drivers should call it. </p><p> Releases an MTRR region. If the usage count drops to zero the register is freed and the region returns to default state. On success the register is returned, on failure a negative error code. </p></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="re320.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch09s04.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch09s05.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span>mtrr_add</span> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> PCI Support Library</td></tr></table></div></body></html>