PCI: Remove unused PCI_SUBTRACTIVE_DECODE

2fe2abf ("PCI: augment bus resource table with a list") added
PCI_SUBTRACTIVE_DECODE which is put into the struct pci_bus_resource flags
field but is never read. There seems to never have been users for it.

Remove both PCI_SUBTRACTIVE_DECODE and the flags field from the struct
pci_bus_resource.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ilpo Järvinen <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Jonathan Cameron <[email protected]>

Author: ij-intel

arch/s390/pci/pci_bus.c

@@ -53,7 +53,7 @@ static int zpci_bus_prepare_device(struct zpci_dev *zdev)
 		zpci_setup_bus_resources(zdev);
 		for (i = 0; i < PCI_STD_NUM_BARS; i++) {
 			if (zdev->bars[i].res)
-				pci_bus_add_resource(zdev->zbus->bus, zdev->bars[i].res, 0);
+				pci_bus_add_resource(zdev->zbus->bus, zdev->bars[i].res);
 		}
 	}
 

arch/x86/pci/fixup.c

@@ -757,7 +757,7 @@ static void pci_amd_enable_64bit_bar(struct pci_dev *dev)
 		dev_info(&dev->dev, "adding root bus resource %pR (tainting kernel)\n",
 			 res);
 		add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
-		pci_bus_add_resource(dev->bus, res, 0);
+		pci_bus_add_resource(dev->bus, res);
 	}
 
 	base = ((res->start >> 8) & AMD_141b_MMIO_BASE_MMIOBASE_MASK) |

drivers/pci/bus.c

@@ -46,8 +46,7 @@ void pci_free_resource_list(struct list_head *resources)
 }
 EXPORT_SYMBOL(pci_free_resource_list);
 
-void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
-			  unsigned int flags)
+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res)
 {
 	struct pci_bus_resource *bus_res;
 
@@ -58,7 +57,6 @@ void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
 	}
 
 	bus_res->res = res;
-	bus_res->flags = flags;
 	list_add_tail(&bus_res->list, &bus->resources);
 }
 

drivers/pci/probe.c

@@ -546,8 +546,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
 	if (dev->transparent) {
 		pci_bus_for_each_resource(child->parent, res) {
 			if (res && res->flags) {
-				pci_bus_add_resource(child, res,
-						     PCI_SUBTRACTIVE_DECODE);
+				pci_bus_add_resource(child, res);
 				pci_info(dev, "  bridge window %pR (subtractive decode)\n",
 					   res);
 			}
@@ -1032,7 +1031,7 @@ static int pci_register_host_bridge(struct pci_host_bridge *bridge)
 		if (res->flags & IORESOURCE_BUS)
 			pci_bus_insert_busn_res(bus, bus->number, res->end);
 		else
-			pci_bus_add_resource(bus, res, 0);
+			pci_bus_add_resource(bus, res);
 
 		if (offset) {
 			if (resource_type(res) == IORESOURCE_IO)

include/linux/pci.h

@@ -633,18 +633,9 @@ int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge);
  * Use pci_bus_for_each_resource() to iterate through all the resources.
  */
 
-/*
- * PCI_SUBTRACTIVE_DECODE means the bridge forwards the window implicitly
- * and there's no way to program the bridge with the details of the window.
- * This does not apply to ACPI _CRS windows, even with the _DEC subtractive-
- * decode bit set, because they are explicit and can be programmed with _SRS.
- */
-#define PCI_SUBTRACTIVE_DECODE	0x1
-
 struct pci_bus_resource {
 	struct list_head	list;
 	struct resource		*res;
-	unsigned int		flags;
 };
 
 #define PCI_REGION_FLAG_MASK	0x0fU	/* These bits of resource flags tell us the PCI region flags */
@@ -1498,8 +1489,7 @@ void pci_add_resource(struct list_head *resources, struct resource *res);
 void pci_add_resource_offset(struct list_head *resources, struct resource *res,
 			     resource_size_t offset);
 void pci_free_resource_list(struct list_head *resources);
-void pci_bus_add_resource(struct pci_bus *bus, struct resource *res,
-			  unsigned int flags);
+void pci_bus_add_resource(struct pci_bus *bus, struct resource *res);
 struct resource *pci_bus_resource_n(const struct pci_bus *bus, int n);
 void pci_bus_remove_resources(struct pci_bus *bus);
 void pci_bus_remove_resource(struct pci_bus *bus, struct resource *res);