Commit f75b99d5a77d63f20e07bd276d5a427808ac8ef6 (PCI: Enforce bus
address limits in resource allocation) broke Alpha systems using
CONFIG_ALPHA_NAUTILUS. Alpha is 64-bit, but Nautilus systems use a
32-bit AMD 751/761 chipset. arch/alpha/kernel/sys_nautilus.c maps PCI
into the upper addresses just below 4GB.

I can get a working kernel by ifdef'ing out the code in
drivers/pci/bus.c:pci_bus_alloc_resource. We can't tie
PCI_BUS_ADDR_T_64BIT to ALPHA_NAUTILUS without breaking generic

How can we get Nautilus working again?
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