Please review this interrupt patch.
It applies to both 2.4 and 2.6.

thanks,
-Len

What the patch does:

Re-enables PCI Link Device programming by default.

This fixes systems that stopped working when we
stopped re-programming active PIRQs:
http://bugzilla.kernel.org/show_bug.cgi?id=1440

For systems that mark their PIRQ links active,
this allows the kernel to again distribute
PIRQs across all available IRQs:
http://bugzilla.kernel.org/show_bug.cgi?id=1391

Fixes an off-by-one bug in the PIRQ distribution
code that caused one of the possible IRQs to be
ignored on every PIRQ link.

To aid in minimizing IRQ sharing, added cmdline
"acpi_irq_pci=" to tell the kernel when it can
use an IRQ for PCI, even if the kernel default
is to reserve that IRQ for ISA use.

Conversely, added "acpi_irq_isa=" cmdline param
to reserve IRQs for ISA.
Workaround for SoundBlaster vs. ACPI PIRQ routing issues:
http://bugzilla.kernel.org/show_bug.cgi?id=430
http://bugzilla.kernel.org/show_bug.cgi?id=1139

Previously we had disabled re-programming active PIRQs to
address http://bugzilla.kernel.org/show_bug.cgi?id=1186
This change will break those broken systems again, unless
they've been fixed in other ways.

Mitigated the impact with a new cmdline parameter
"acpi_irq_static" that restores the previous behavior
of not moving PCI Link devices that are marked active.