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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>bitmap_fold</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="ch03.html#id2962812" title="Bitmap Operations" /><link rel="prev" href="re112.html" title="bitmap_onto" /><link rel="next" href="re114.html" title="bitmap_find_free_region" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><span>bitmap_fold</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="re112.html">Prev</a> </td><th width="60%" align="center">Bitmap Operations</th><td width="20%" align="right"> <a accesskey="n" href="re114.html">Next</a></td></tr></table><hr /></div><div class="refentry" title="bitmap_fold"><a id="API-bitmap-fold"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>bitmap_fold —
fold larger bitmap into smaller, modulo specified size
</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">void <b class="fsfunc">bitmap_fold </b>(</code></td><td>unsigned long * <var class="pdparam">dst</var>, </td></tr><tr><td> </td><td>const unsigned long * <var class="pdparam">orig</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">sz</var>, </td></tr><tr><td> </td><td>int <var class="pdparam">bits</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer"> </div></div></div><div class="refsect1" title="Arguments"><a id="id2965627"></a><h2>Arguments</h2><div class="variablelist"><dl><dt><span class="term"><em class="parameter"><code>dst</code></em></span></dt><dd><p>
resulting smaller bitmap
</p></dd><dt><span class="term"><em class="parameter"><code>orig</code></em></span></dt><dd><p>
original larger bitmap
</p></dd><dt><span class="term"><em class="parameter"><code>sz</code></em></span></dt><dd><p>
specified size
</p></dd><dt><span class="term"><em class="parameter"><code>bits</code></em></span></dt><dd><p>
number of bits in each of these bitmaps
</p></dd></dl></div></div><div class="refsect1" title="Description"><a id="id2965704"></a><h2>Description</h2><p>
For each bit oldbit in <em class="parameter"><code>orig</code></em>, set bit oldbit mod <em class="parameter"><code>sz</code></em> in <em class="parameter"><code>dst</code></em>.
Clear all other bits in <em class="parameter"><code>dst</code></em>. See further the comment and
Example [2] for <code class="function">bitmap_onto</code> for why and how to use this.
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