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<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="re322.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="re322.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="id3000343"></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="id3000404"></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.
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