linux-kernel - Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

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Message-Id: <1179466769.3658.0.camel@localhost.localdomain>
Date:	Fri, 18 May 2007 13:39:29 +0800
From:	Dave Liu <r63238@...escale.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Cc:	Segher Boessenkool <segher@...nel.crashing.org>,
	linuxppc-dev@...abs.org, tglx@...utronix.de, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver

> > Yes, on some implementations there can be other conditions that
> > make a decrementer exception go away; there is no contradiction
> > here (thankfully).  My wording was sloppy.
> 
> Some CPUs have the DEC exceptions basically edge triggered (yeah I know

for example?

> it sucks). That's why, among others, the IRQ soft-disable code has code
> to re-trigger DEC exceptions ASAP (by setting it to 1.. note that we
> could probably use 0 here, we've been a bit conservative).


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