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<H1><A NAME="SECTION001500000000000000000">&#160;</A><A NAME="bad-ideas">&#160;</A>
<BR>
Common Pitfalls
</H1>

<P>
Before I send you on your way to go out into the world and write kernel
modules, there are a few things I need to warn you about. If I fail to
warn you and something bad happen, please report the problem to me for a
full refund of the amount I got paid for your copy of the book.
<A NAME="727">&#160;</A>

<P>
<DL COMPACT>
<DD><P>
<DT>1.
<DD><B>Using standard libraries</B> You can't do that. In a kernel
	module you can only use kernel functions, which are the functions
	you can see in <TT>/proc/ksyms</TT>.
	<A NAME="731">&#160;</A><A NAME="732">&#160;</A>
	<A NAME="733">&#160;</A><A NAME="734">&#160;</A>

<P>
<DT>2.
<DD><B>Disabling interrupts</B> You might need to do this for a short
	time and that is OK, but if you don't enable them afterwards, your
	system will be stuck and you'll have to power it off.
	<A NAME="736">&#160;</A>

<P>
<DT>3.
<DD><B>Sticking your head inside a large carnivore</B> I probably don't have
	to warn you about this, but I figured I will anyway, just in case.

<P>
</DL>

<P>

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<ADDRESS>
<I></I>
<BR><I>1999-05-19</I>
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