linux-kernel - [PATCH 1/3] PCI: Remove unused PCI_SUBTRACTIVE

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Message-Id: <20241017141111.44612-1-ilpo.jarvinen@linux.intel.com>
Date: Thu, 17 Oct 2024 17:11:08 +0300
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Niklas Schnelle <schnelle@...ux.ibm.com>,
	Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	linux-s390@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-pci@...r.kernel.org
Cc: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH 1/3] PCI: Remove unused PCI_SUBTRACTIVE_DECODE

The commit 2fe2abf896c1 ("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.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
---
 arch/s390/pci/pci_bus.c |  2 +-
 arch/x86/pci/fixup.c    |  2 +-
 drivers/pci/bus.c       |  4 +---
 drivers/pci/probe.c     |  5 ++---
 include/linux/pci.h     | 12 +-----------
 5 files changed, 6 insertions(+), 19 deletions(-)

diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c
index daa5d7450c7d..5630af5deb8b 100644
--- a/arch/s390/pci/pci_bus.c
+++ b/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);
 		}
 	}
 
diff --git a/arch/x86/pci/fixup.c b/arch/x86/pci/fixup.c
index 98a9bb92d75c..0681ecfe3430 100644
--- a/arch/x86/pci/fixup.c
+++ b/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) |
diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 55c853686051..9cf6d0f3ab2b 100644
--- a/drivers/pci/bus.c
+++ b/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);
 }
 
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 4f68414c3086..4243b1e6ece2 100644
--- a/drivers/pci/probe.c
+++ b/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)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 573b4c4c2be6..6a9cf80d0d4b 100644
--- a/include/linux/pci.h
+++ b/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);
-- 
2.39.5