Missing isa_ symbols

[Christoph Hellwig]

I've recently switched CONFIG_ISA on to compile-test various scsi
drivers and get lots of warnings like:

WARNING: /lib/modules/2.6.2-rc3/kernel/drivers/scsi/wd7000.ko needs unknown symbol isa_bus_to_virt
WARNING: /lib/modules/2.6.2-rc3/kernel/drivers/scsi/wd7000.ko needs unknown symbol isa_page_to_bus
WARNING: /lib/modules/2.6.2-rc3/kernel/drivers/scsi/wd7000.ko needs unknown symbol isa_virt_to_bus
WARNING: /lib/modules/2.6.2-rc3/kernel/drivers/scsi/wd7000.ko needs unknown symbol udelay

from looking at other architectures it looks like architectures
supporting CONFIG_ISA are supposed to supply them.  Any idea how to
implement this properly for ppc?  (and no, I can't test it, by mac
doesn't actually have an isa bus)

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