<?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>Some Functions Which Don't Sleep</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Unreliable Guide To Locking" /><link rel="up" href="ch10.html" title="Chapter 10. What Functions Are Safe To Call From Interrupts?" /><link rel="prev" href="ch10.html" title="Chapter 10. What Functions Are Safe To Call From Interrupts?" /><link rel="next" href="ch11.html" title="Chapter 11. Further reading" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Some Functions Which Don't Sleep</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch10.html">Prev</a> </td><th width="60%" align="center">Chapter 10. What Functions Are Safe To Call From Interrupts?</th><td width="20%" align="right"> <a accesskey="n" href="ch11.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="Some Functions Which Don't Sleep"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="dont-sleep"></a>Some Functions Which Don't Sleep</h2></div></div></div><p>
Some functions are safe to call from any context, or holding
almost any lock.
</p><div class="itemizedlist"><ul class="itemizedlist" type="disc"><li class="listitem"><p>
<code class="function">printk()</code>
</p></li><li class="listitem"><p>
<code class="function">kfree()</code>
</p></li><li class="listitem"><p>
<code class="function">add_timer()</code> and <code class="function">del_timer()</code>
</p></li></ul></div></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch10.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch10.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch11.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Chapter 10. What Functions Are Safe To Call From Interrupts? </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> Chapter 11. Further reading</td></tr></table></div></body></html>
