pci_bus_max_busnr(9) centos man page | unix.com

PCI_BUS_MAX_BUSNR(9)						Hardware Interfaces					      PCI_BUS_MAX_BUSNR(9)

NAME
       pci_bus_max_busnr - returns maximum PCI bus number of given bus' children

SYNOPSIS
       unsigned char pci_bus_max_busnr(struct pci_bus * bus);

ARGUMENTS
       bus
	   pointer to PCI bus structure to search

DESCRIPTION
       Given a PCI bus, returns the highest PCI bus number present in the set including the given PCI bus and its list of child PCI buses.

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Kernel Hackers Manual 3.10					     June 2014						      PCI_BUS_MAX_BUSNR(9)