1<html><head><meta http-equiv="Content-Type" content="text/html; charset=ANSI_X3.4-1968"><title>kgdb_roundup_cpus</title><meta name="generator" content="DocBook XSL Stylesheets V1.78.1"><link rel="home" href="index.html" title="Using kgdb, kdb and the kernel debugger internals"><link rel="up" href="CommonBackEndReq.html#kgdbArchitecture" title="Architecture Specifics"><link rel="prev" href="API-kgdb-arch-handle-exception.html" title="kgdb_arch_handle_exception"><link rel="next" href="API-kgdb-arch-set-pc.html" title="kgdb_arch_set_pc"></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">kgdb_roundup_cpus</span></th></tr><tr><td width="20%" align="left"><a accesskey="p" href="API-kgdb-arch-handle-exception.html">Prev</a>&#160;</td><th width="60%" align="center">Architecture Specifics</th><td width="20%" align="right">&#160;<a accesskey="n" href="API-kgdb-arch-set-pc.html">Next</a></td></tr></table><hr></div><div class="refentry"><a name="API-kgdb-roundup-cpus"></a><div class="titlepage"></div><div class="refnamediv"><h2>Name</h2><p>kgdb_roundup_cpus &#8212; 
2     Get other CPUs into a holding pattern
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">kgdb_roundup_cpus </b>(</code></td><td>unsigned long <var class="pdparam">flags</var><code>)</code>;</td></tr></table><div class="funcprototype-spacer">&#160;</div></div></div><div class="refsect1"><a name="idp1114346252"></a><h2>Arguments</h2><div class="variablelist"><dl class="variablelist"><dt><span class="term"><em class="parameter"><code>flags</code></em></span></dt><dd><p>
4     Current IRQ state
5    </p></dd></dl></div></div><div class="refsect1"><a name="idp1114347820"></a><h2>Description</h2><p>
6   On SMP systems, we need to get the attention of the other CPUs
7   and get them into a known state.  This should do what is needed
8   to get the other CPUs to call <code class="function">kgdb_wait</code>. Note that on some arches,
9   the NMI approach is not used for rounding up all the CPUs. For example,
10   in case of MIPS, <code class="function">smp_call_function</code> is used to roundup CPUs. In
11   this case, we have to make sure that interrupts are enabled before
12   calling <code class="function">smp_call_function</code>. The argument to this function is
13   the flags that will be used when restoring the interrupts. There is
14   <code class="function">local_irq_save</code> call before <code class="function">kgdb_roundup_cpus</code>.
15   </p><p>
16
17   On non-SMP systems, this is not called.
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