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authorJason Wessel <jason.wessel@windriver.com>2012-03-19 19:35:55 -0500
committerJason Wessel <jason.wessel@windriver.com>2012-03-22 15:07:16 -0500
commitbec4d62ead8096e433d624d9339893f50badd992 (patch)
treefd48a6b49acaec668f8b9dfa18c9dedc56d8a0b7 /Documentation/DocBook
parent8f30d411767351656ea62c9e7612120f9b870b59 (diff)
downloadop-kernel-dev-bec4d62ead8096e433d624d9339893f50badd992.zip
op-kernel-dev-bec4d62ead8096e433d624d9339893f50badd992.tar.gz
kgdb,debug_core: add the ability to control the reboot notifier
Sometimes it is desirable to stop the kernel debugger before allowing a system to reboot either with kdb or kgdb. This patch adds the ability to turn the reboot notifier on and off or enter the debugger and stop kernel execution before rebooting. It is possible to change the setting after booting the kernel with the following: echo 1 > /sys/module/debug_core/parameters/kgdbreboot It is also possible to change this setting using kdb / kgdb to manipulate the variable directly. Using KDB: mm kgdbreboot 1 Using gdb: set kgdbreboot=1 Reported-by: Jan Kiszka <jan.kiszka@siemens.com> Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
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diff --git a/Documentation/DocBook/kgdb.tmpl b/Documentation/DocBook/kgdb.tmpl
index d71b57f..4ee4ba3 100644
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@@ -362,6 +362,23 @@
</para>
</para>
</sect1>
+ <sect1 id="kgdbreboot">
+ <title>Run time parameter: kgdbreboot</title>
+ <para> The kgdbreboot feature allows you to change how the debugger
+ deals with the reboot notification. You have 3 choices for the
+ behavior. The default behavior is always set to 0.</para>
+ <orderedlist>
+ <listitem><para>echo -1 > /sys/module/debug_core/parameters/kgdbreboot</para>
+ <para>Ignore the reboot notification entirely.</para>
+ </listitem>
+ <listitem><para>echo 0 > /sys/module/debug_core/parameters/kgdbreboot</para>
+ <para>Send the detach message to any attached debugger client.</para>
+ </listitem>
+ <listitem><para>echo 1 > /sys/module/debug_core/parameters/kgdbreboot</para>
+ <para>Enter the debugger on reboot notify.</para>
+ </listitem>
+ </orderedlist>
+ </sect1>
</chapter>
<chapter id="usingKDB">
<title>Using kdb</title>
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