x86/PCI: Remove unused pci_root_bus

pci_root_bus is unused, so remove all references to it.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/x86/include/asm/pci_x86.h

@@ -54,7 +54,6 @@ void pcibios_set_cache_line_size(void);
 /* pci-pc.c */
 
 extern int pcibios_last_bus;
-extern struct pci_bus *pci_root_bus;
 extern struct pci_ops pci_root_ops;
 
 void pcibios_scan_specific_bus(int busn);

arch/x86/pci/common.c

@@ -34,7 +34,6 @@ int noioapicreroute = 1;
 #endif
 int pcibios_last_bus = -1;
 unsigned long pirq_table_addr;
-struct pci_bus *pci_root_bus;
 const struct pci_raw_ops *__read_mostly raw_pci_ops;
 const struct pci_raw_ops *__read_mostly raw_pci_ext_ops;
 

arch/x86/pci/legacy.c

@@ -30,7 +30,7 @@ int __init pci_legacy_init(void)
 	}
 
 	printk("PCI: Probing PCI hardware\n");
-	pci_root_bus = pcibios_scan_root(0);
+	pcibios_scan_root(0);
 	return 0;
 }
 

arch/x86/pci/numaq_32.c

@@ -152,7 +152,7 @@ int __init pci_numaq_init(void)
 
 	raw_pci_ops = &pci_direct_conf1_mq;
 
-	pci_root_bus = pcibios_scan_root(0);
+	pcibios_scan_root(0);
 	if (num_online_nodes() > 1)
 		for_each_online_node(quad) {
 			if (quad == 0)