PCI: Add a generic weak pcibios_fixup_bus()

Multiple architectures define this as an empty function, and I'm adding
another one as part of the RISC-V port.  Add a __weak version of
pcibios_fixup_bus() and delete the now-obselete ones in a handful of
ports.

The only functional change should be that microblaze used to export
pcibios_fixup_bus().  None of the other architectures exports this, so I
just dropped it.

Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

arch/arc/kernel/pcibios.c

@@ -16,7 +16,3 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 {
 	return res->start;
 }
-
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-}

arch/arm64/kernel/pci.c

@@ -22,14 +22,6 @@
 #include <linux/pci-ecam.h>
 #include <linux/slab.h>
 
-/*
- * Called after each bus is probed, but before its children are examined
- */
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-	/* nothing to do, expected to be removed in the future */
-}
-
 /*
  * We don't have to worry about legacy ISA devices, so nothing to do here
  */

arch/cris/arch-v32/drivers/pci/bios.c

@@ -2,10 +2,6 @@
 #include <linux/kernel.h>
 #include <hwregs/intr_vect.h>
 
-void pcibios_fixup_bus(struct pci_bus *b)
-{
-}
-
 void pcibios_set_master(struct pci_dev *dev)
 {
 	u8 lat;

arch/microblaze/pci/pci-common.c

@@ -810,12 +810,6 @@ void pcibios_setup_bus_devices(struct pci_bus *bus)
 	}
 }
 
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-	/* nothing to do */
-}
-EXPORT_SYMBOL(pcibios_fixup_bus);
-
 /*
  * We need to avoid collisions with `mirrored' VGA ports
  * and other strange ISA hardware, so we always want the

arch/s390/pci/pci.c

@@ -262,10 +262,6 @@ static int zpci_cfg_store(struct zpci_dev *zdev, int offset, u32 val, u8 len)
 	return rc;
 }
 
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-}
-
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 				       resource_size_t size,
 				       resource_size_t align)

arch/sh/drivers/pci/pci.c

@@ -154,14 +154,6 @@ static int __init pcibios_init(void)
 }
 subsys_initcall(pcibios_init);
 
-/*
- *  Called after each bus is probed, but before its children
- *  are examined.
- */
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-}
-
 /*
  * We need to avoid collisions with `mirrored' VGA ports
  * and other strange ISA hardware, so we always want the

arch/sparc/kernel/pci.c

@@ -690,10 +690,6 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_info *pbm,
 	return bus;
 }
 
-void pcibios_fixup_bus(struct pci_bus *pbus)
-{
-}
-
 resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 				resource_size_t size, resource_size_t align)
 {

arch/tile/kernel/pci.c

@@ -369,14 +369,6 @@ int __init pcibios_init(void)
 }
 subsys_initcall(pcibios_init);
 
-/*
- * No bus fixups needed.
- */
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-	/* Nothing needs to be done. */
-}
-
 void pcibios_set_master(struct pci_dev *dev)
 {
 	/* No special bus mastering setup handling. */

arch/tile/kernel/pci_gx.c

@@ -1038,11 +1038,6 @@ alloc_mem_map_failed:
 }
 subsys_initcall(pcibios_init);
 
-/* No bus fixups needed. */
-void pcibios_fixup_bus(struct pci_bus *bus)
-{
-}
-
 /* Process any "pci=" kernel boot arguments. */
 char *__init pcibios_setup(char *str)
 {

drivers/pci/probe.c

@@ -2288,6 +2288,15 @@ void pcie_bus_configure_settings(struct pci_bus *bus)
 }
 EXPORT_SYMBOL_GPL(pcie_bus_configure_settings);
 
+/*
+ * Called after each bus is probed, but before its children are examined.  This
+ * is marked as __weak because multiple architectures define it.
+ */
+void __weak pcibios_fixup_bus(struct pci_bus *bus)
+{
+       /* nothing to do, expected to be removed in the future */
+}
+
 unsigned int pci_scan_child_bus(struct pci_bus *bus)
 {
 	unsigned int devfn, pass, max = bus->busn_res.start;