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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>smp_processor_id() include/asm/smp.h</title><meta name="generator" content="DocBook XSL Stylesheets V1.75.2" /><link rel="home" href="index.html" title="Unreliable Guide To Hacking The Linux Kernel" /><link rel="up" href="ch06.html" title="Chapter 6. Common Routines" /><link rel="prev" href="ch06s08.html" title="local_bh_disable()/local_bh_enable() include/linux/interrupt.h" /><link rel="next" href="ch06s10.html" title="__init/__exit/__initdata include/linux/init.h" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center"><code class="function">smp_processor_id</code>()
<code class="filename">include/asm/smp.h</code></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch06s08.html">Prev</a> </td><th width="60%" align="center">Chapter 6. Common Routines</th><td width="20%" align="right"> <a accesskey="n" href="ch06s10.html">Next</a></td></tr></table><hr /></div><div class="sect1" title="smp_processor_id() include/asm/smp.h"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a id="routines-processorids"></a><code class="function">smp_processor_id</code>()
<code class="filename">include/asm/smp.h</code></h2></div></div></div><p>
<code class="function">get_cpu()</code> disables preemption (so you won't
suddenly get moved to another CPU) and returns the current
processor number, between 0 and <span class="symbol">NR_CPUS</span>. Note
that the CPU numbers are not necessarily continuous. You return
it again with <code class="function">put_cpu()</code> when you are done.
</p><p>
If you know you cannot be preempted by another task (ie. you are
in interrupt context, or have preemption disabled) you can use
smp_processor_id().
</p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="ch06s08.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="ch06.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="ch06s10.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top"><code class="function">local_bh_disable()</code>/<code class="function">local_bh_enable()</code>
<code class="filename">include/linux/interrupt.h</code> </td><td width="20%" align="center"><a accesskey="h" href="index.html">Home</a></td><td width="40%" align="right" valign="top"> <span class="type">__init</span>/<span class="type">__exit</span>/<span class="type">__initdata</span>
<code class="filename">include/linux/init.h</code></td></tr></table></div></body></html>
