On 27.05.2011, at 12:33, Paul Mackerras wrote: > On Tue, May 17, 2011 at 12:17:50PM +0200, Alexander Graf wrote: >> >> On 16.05.2011, at 07:58, Paul Mackerras wrote: >> >>> I do the check there because I was having problems where, if the HDEC >>> goes negative before we do the partition switch, we would occasionally >>> not get the HDEC interrupt at all until the next time HDEC went >>> negative, ~ 8.4 seconds later. >> >> Yikes - so HDEC is edge and doesn't even keep the interrupt line up? >> That sounds like a serious hardware limitation. What if you only use >> HDEC and it triggers while interrupts are off in a critical section? >> Is the hardware really that broken? > > If HDEC expires when interrupts are off, the HDEC interrupt stays > pending until interrupts get re-enabled. I'm not sure exactly what > the conditions are that cause an HDEC interrupt to get lost, but they > seem to involve at least a partition switch. Please try to contact some of your hardware designers and figure out what exactly the conditions are. Maybe we don't need this hack. Alex -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
