Messages in this thread | | | Subject | Re: [PATCH 2.6.21-rt2] PowerPC: decrementer clockevent driver | From | Benjamin Herrenschmidt <> | Date | Fri, 18 May 2007 15:04:49 +1000 |
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> > 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 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).
Ben.
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