x86: fix section mismatch in pci_scan_bus

Fix following section mismatch warning:
WARNING: vmlinux.o(.text+0x275616): Section mismatch in reference from the function pci_scan_bus() to the function .devinit.text:pci_scan_bus_parented()

The warning was seen with a CONFIG_DEBUG_SECTION_MISMATCH=y build.
The inline function pci_scan_bus refer to functions annotated
__devinit - so annotate it __devinit too.
This revealed a few x86 specific functions that were only
used from __init or __devinit context.
So annotate these __devinit and the warning was killed.

The added include in pci.h was not strictly required but
added to avoid being dependent on indirect includes.
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Jesse Barnes <jbarnes@hobbes.lan>

arch/x86/pci/common.c

@@ -489,7 +489,7 @@ void pcibios_disable_device (struct pci_dev *dev)
 		pcibios_disable_irq(dev);
 }
 
-struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
+struct pci_bus * __devinit pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 {
 	struct pci_bus *bus = NULL;
 	struct pci_sysdata *sd;
@@ -512,7 +512,7 @@ struct pci_bus *pci_scan_bus_on_node(int busno, struct pci_ops *ops, int node)
 	return bus;
 }
 
-struct pci_bus *pci_scan_bus_with_sysdata(int busno)
+struct pci_bus * __devinit pci_scan_bus_with_sysdata(int busno)
 {
 	return pci_scan_bus_on_node(busno, &pci_root_ops, -1);
 }

include/linux/pci.h

@@ -44,6 +44,7 @@
 #include <linux/mod_devicetable.h>
 
 #include <linux/types.h>
+#include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/list.h>
 #include <linux/compiler.h>
@@ -474,7 +475,7 @@ extern struct pci_bus *pci_find_bus(int domain, int busnr);
 void pci_bus_add_devices(struct pci_bus *bus);
 struct pci_bus *pci_scan_bus_parented(struct device *parent, int bus,
 				      struct pci_ops *ops, void *sysdata);
-static inline struct pci_bus *pci_scan_bus(int bus, struct pci_ops *ops,
+static inline struct pci_bus * __devinit pci_scan_bus(int bus, struct pci_ops *ops,
 					   void *sysdata)
 {
 	struct pci_bus *root_bus;