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From: Segher Boessenkool <segher@kernel.crashing.org>
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver
Date: Sat, 19 May 2007 01:49:59 +0200
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
	Dave Liu <r63238@freescale.com>, mingo@elte.hu, tglx@linutronix.de
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> I find it extremely silly to implement it as edge anyway. The EE line 
> is
> level triggered, and having a mix of edge and level on the same
> exception without a clean way to retrigger the DEC one other than
> waiting one tick is just causing trouble.

It isn't edge triggered, it just automatically clears the
decrementer exception condition at its source when taken
(on certain implementations -- others leave it to software
to clear it).


Segher