linux-kernel - What does irq_canonicalize mean?

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Message-ID: <4104961b0707230612l7250489dk6064b9cd2170bfaf@mail.gmail.com>
Date:	Mon, 23 Jul 2007 21:12:22 +0800
From:	"jidong xiao" <jidong.xiao@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: What does irq_canonicalize mean?

I found this function, inside include/asm-i386/irq.h or
include/asm-x86_64/irq.h,

static __inline__ int irq_canonicalize(int irq)
{
	return ((irq == 2) ? 9 : irq);
}

there is no comments,so I am totally confused what does this function
mean, why there is a "2", and why there is a "9"?

Thanks
Jason Xiao
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