linux-kernel - why kernel implement "udelay" by cpu instructions?

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Date:	Mon, 2 Nov 2009 11:13:51 +0800
From:	loody <miloody@...il.com>
To:	linux-kernel@...r.kernel.org,
	Kernel Newbies <kernelnewbies@...linux.org>
Subject: why kernel implement "udelay" by cpu instructions?

Dear all:
I find the kernel use cpu instruction to implement the udelay function
as keeping decrease a big counter by 1.

If I search the right place in kernel, why kernel does so?
the precision will be different if cpu runs faster or slower, right?
appreciate your help,
miloody
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