PCI bus numbering in a system with multiple PCI controllers

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Hi,

Assuming the firmware has not done any PCI bus enumeration in a system
with 2 PCI controllers, I want to know if PCI bus numbering done by
Linux WILL have bus numbers repeated (among the 2 PCI trees). 

For instance:

1) Will the bus emanating from both the PCI bus controllers have PCI bus
no 0 (although they will have different PCI domain numbers).

OR

2) Will one of them have PCI bus no 0 and the other will be different?

Thanks,

Rajat Jain
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