On Wed, 2007-12-12 at 15:41 -0500, Steven Rostedt wrote: > The IOAPIC hack that does a level=>edge to mask does not disable > interrupts. So we can receive interrupts when masked, and this means > that we can miss interrupts that arrive when the thread is handling > them. > > This patch adds the "IRQ_PENDING" logic of the edge irqs to be > able to catch interrupts coming in when supposably "masked". ACK on all of these. I've been using them internally for a bit in pursuit of a later problem. Additionally, I am currently reworking the level->edge->level hack because it's known to be in violation of a number of errata from third parties. The "legacy mode" hack is actually only need on certain systems, which have e.g. a PCIe host bridge with integrated IO-APIC that snoops the APIC to determine mask status. I'm going to add a blacklist and quirks instead, as doing level->edge->level otherwise causes us to start losing interrupts on other systems. I will supply more information later - this is a somewhat involved problem that we (Red Hat) have been looking at for a while. Jon. - To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
