1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>mempool_alloc</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-mempool-resize.html" title="mempool_resize"><link rel="next" href="API-mempool-free.html" title="mempool_free"></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">mempool_alloc</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-mempool-resize.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-mempool-free.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-mempool-alloc"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>mempool_alloc &#8212; 
2     allocate an element from a specific memory pool
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">mempool_alloc </b>(</code></td><td>mempool_t * <var class="pdparam">pool</var>, </td></tr><tr><td>&#160;</td><td>gfp_t <var class="pdparam">gfp_mask</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1124694900"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>pool</code></em></span></dt><dd><p>
4     pointer to the memory pool which was allocated via
5     <code class="function">mempool_create</code>.
6    </p></dd><dt><span class="term"><em class="parameter"><code>gfp_mask</code></em></span></dt><dd><p>
7     the usual allocation bitmask.
8    </p></dd></dl></div></div><div class="refsect1"><a name="idp1124697948"></a><h2>Description</h2><p>
9   this function only sleeps if the <code class="function">alloc_fn</code> function sleeps or
10   returns NULL. Note that due to preallocation, this function
11   *never* fails when called from process contexts. (it might
12   fail if called from an IRQ context.)
13</p></div><div class="refsect1"><a name="idp1124699124"></a><h2>Note</h2><p>
14   using __GFP_ZERO is not supported.
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