Sorry about reporting this error so late but the machine in question had
gone some time without upgrades.

The problem I'm seeing is that IRQs stop working for one of the IRQ
slots on the machine. It's only that slot, not the entire IRQ, since the
two slots (it's a small machine) both get routed to IRQ 10.

I've included dmesg from 2.6.10-rc1 (which works) and 2.6.10-rc2 (which
doesn't).

I've also tried reverting the patches that modifies
arch/i386/kernel/irq.c and arch/i386/pci/irq.c but it didn't solve the
problem. So now I need some more input on which patches to try.

Rgds
Pierre