1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>rcu_idle_exit</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Linux Device Drivers"><link rel="up" href="ch01s09.html" title="Kernel utility functions"><link rel="prev" href="API-rcu-idle-enter.html" title="rcu_idle_enter"><link rel="next" href="API-rcu-is-watching.html" title="rcu_is_watching"></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">rcu_idle_exit</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-rcu-idle-enter.html">Prev</a>&#160;</td><th width="60%" align="center">Kernel utility functions</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-rcu-is-watching.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-rcu-idle-exit"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>rcu_idle_exit &#8212; 
2     inform RCU that current CPU is leaving idle
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">rcu_idle_exit </b>(</code></td><td> <var class="pdparam">void</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1108605828"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>void</code></em></span></dt><dd><p>
4     no arguments
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1108607436"></a><h2>Description</h2><p>
6   </p><p>
7
8   Exit idle mode, in other words, -enter- the mode in which RCU
9   read-side critical sections can occur.
10   </p><p>
11
12   We crowbar the -&gt;dynticks_nesting field to DYNTICK_TASK_NEST to
13   allow for the possibility of usermode upcalls messing up our count
14   of interrupt nesting level during the busy period that is just
15   now starting.
16</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="API-rcu-idle-enter.html">Prev</a>&#160;</td><td width="20%" align="center"><a accesskey="u" href="ch01s09.html">Up</a></td><td width="40%" align="right">&#160;<a accesskey="n" href="API-rcu-is-watching.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><span class="phrase">rcu_idle_enter</span>&#160;</td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top">&#160;<span class="phrase">rcu_is_watching</span></td></tr></table></div></body></html>
17