Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
From:   Andy Shevchenko <andriy.shevchenko@linux.intel.com>
To:     =?UTF-8?q?Micka=C3=ABl=20Sala=C3=BCn?= <mic@digikod.net>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Randy Dunlap <rdunlap@infradead.org>,
        Arnd Bergmann <arnd@arndb.de>,
        Niklas Schnelle <schnelle@linux.ibm.com>,
        Bjorn Helgaas <helgaas@kernel.org>,
        "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>,
        =?UTF-8?q?Pali=20Roh=C3=A1r?= <pali@kernel.org>,
        "Maciej W. Rozycki" <macro@orcam.me.uk>,
        Juergen Gross <jgross@suse.com>,
        Dominik Brodowski <linux@dominikbrodowski.net>,
        linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        linuxppc-dev@lists.ozlabs.org, linux-sh@vger.kernel.org,
        sparclinux@vger.kernel.org, linux-pci@vger.kernel.org,
        xen-devel@lists.xenproject.org, linux-acpi@vger.kernel.org
Cc:     Miguel Ojeda <ojeda@kernel.org>,
        Richard Henderson <richard.henderson@linaro.org>,
        Ivan Kokshaysky <ink@jurassic.park.msu.ru>,
        Matt Turner <mattst88@gmail.com>,
        Russell King <linux@armlinux.org.uk>,
        Andrew Lunn <andrew@lunn.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Nicholas Piggin <npiggin@gmail.com>,
        Christophe Leroy <christophe.leroy@csgroup.eu>,
        Anatolij Gustschin <agust@denx.de>,
        Yoshinori Sato <ysato@users.sourceforge.jp>,
        Rich Felker <dalias@libc.org>,
        John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>,
        "David S. Miller" <davem@davemloft.net>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Stefano Stabellini <sstabellini@kernel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Subject: [PATCH v7 3/6] PCI: Allow pci_bus_for_each_resource() to take less arguments
Date:   Thu, 23 Mar 2023 19:36:07 +0200
Message-Id: <20230323173610.60442-4-andriy.shevchenko@linux.intel.com>
In-Reply-To: <20230323173610.60442-1-andriy.shevchenko@linux.intel.com>
References: <20230323173610.60442-1-andriy.shevchenko@linux.intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

Refactor pci_bus_for_each_resource() in the same way as it's done in
pci_dev_for_each_resource() case. This will allow to hide iterator
inside the loop, where it's not used otherwise.

No functional changes intended.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
---
 drivers/pci/bus.c                  |  7 +++----
 drivers/pci/hotplug/shpchp_sysfs.c |  8 ++++----
 drivers/pci/pci.c                  |  3 +--
 drivers/pci/probe.c                |  2 +-
 drivers/pci/setup-bus.c            | 10 ++++------
 include/linux/pci.h                | 17 +++++++++++++----
 6 files changed, 26 insertions(+), 21 deletions(-)

diff --git a/drivers/pci/bus.c b/drivers/pci/bus.c
index 549c4bd5caec..5bc81cc0a2de 100644
--- a/drivers/pci/bus.c
+++ b/drivers/pci/bus.c
@@ -182,13 +182,13 @@ static int pci_bus_alloc_from_region(struct pci_bus *bus, struct resource *res,
 		void *alignf_data,
 		struct pci_bus_region *region)
 {
-	int i, ret;
 	struct resource *r, avail;
 	resource_size_t max;
+	int ret;
 
 	type_mask |= IORESOURCE_TYPE_BITS;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		resource_size_t min_used = min;
 
 		if (!r)
@@ -289,9 +289,8 @@ bool pci_bus_clip_resource(struct pci_dev *dev, int idx)
 	struct resource *res = &dev->resource[idx];
 	struct resource orig_res = *res;
 	struct resource *r;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		resource_size_t start, end;
 
 		if (!r)
diff --git a/drivers/pci/hotplug/shpchp_sysfs.c b/drivers/pci/hotplug/shpchp_sysfs.c
index 64beed7a26be..01d47a42da04 100644
--- a/drivers/pci/hotplug/shpchp_sysfs.c
+++ b/drivers/pci/hotplug/shpchp_sysfs.c
@@ -24,16 +24,16 @@
 static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char *buf)
 {
 	struct pci_dev *pdev;
-	int index, busnr;
 	struct resource *res;
 	struct pci_bus *bus;
 	size_t len = 0;
+	int busnr;
 
 	pdev = to_pci_dev(dev);
 	bus = pdev->subordinate;
 
 	len += sysfs_emit_at(buf, len, "Free resources: memory\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_MEM) &&
 				!(res->flags & IORESOURCE_PREFETCH)) {
 			len += sysfs_emit_at(buf, len,
@@ -43,7 +43,7 @@ static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char
 		}
 	}
 	len += sysfs_emit_at(buf, len, "Free resources: prefetchable memory\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_MEM) &&
 			       (res->flags & IORESOURCE_PREFETCH)) {
 			len += sysfs_emit_at(buf, len,
@@ -53,7 +53,7 @@ static ssize_t show_ctrl(struct device *dev, struct device_attribute *attr, char
 		}
 	}
 	len += sysfs_emit_at(buf, len, "Free resources: IO\n");
-	pci_bus_for_each_resource(bus, res, index) {
+	pci_bus_for_each_resource(bus, res) {
 		if (res && (res->flags & IORESOURCE_IO)) {
 			len += sysfs_emit_at(buf, len,
 					     "start = %8.8llx, length = %8.8llx\n",
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7a67611dc5f4..99299f1299c4 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -779,9 +779,8 @@ struct resource *pci_find_parent_resource(const struct pci_dev *dev,
 {
 	const struct pci_bus *bus = dev->bus;
 	struct resource *r;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		if (!r)
 			continue;
 		if (resource_contains(r, res)) {
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index a3f68b6ba6ac..f8191750f6b7 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -533,7 +533,7 @@ void pci_read_bridge_bases(struct pci_bus *child)
 	pci_read_bridge_mmio_pref(child);
 
 	if (dev->transparent) {
-		pci_bus_for_each_resource(child->parent, res, i) {
+		pci_bus_for_each_resource(child->parent, res) {
 			if (res && res->flags) {
 				pci_bus_add_resource(child, res,
 						     PCI_SUBTRACTIVE_DECODE);
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 027b985dd1ee..fdeb121e9175 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -770,9 +770,8 @@ static struct resource *find_bus_resource_of_type(struct pci_bus *bus,
 						  unsigned long type)
 {
 	struct resource *r, *r_assigned = NULL;
-	int i;
 
-	pci_bus_for_each_resource(bus, r, i) {
+	pci_bus_for_each_resource(bus, r) {
 		if (r == &ioport_resource || r == &iomem_resource)
 			continue;
 		if (r && (r->flags & type_mask) == type && !r->parent)
@@ -1204,7 +1203,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
 			additional_mmio_pref_size = 0;
 	struct resource *pref;
 	struct pci_host_bridge *host;
-	int hdr_type, i, ret;
+	int hdr_type, ret;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
@@ -1228,7 +1227,7 @@ void __pci_bus_size_bridges(struct pci_bus *bus, struct list_head *realloc_head)
 		host = to_pci_host_bridge(bus->bridge);
 		if (!host->size_windows)
 			return;
-		pci_bus_for_each_resource(bus, pref, i)
+		pci_bus_for_each_resource(bus, pref)
 			if (pref && (pref->flags & IORESOURCE_PREFETCH))
 				break;
 		hdr_type = -1;	/* Intentionally invalid - not a PCI device. */
@@ -1333,12 +1332,11 @@ EXPORT_SYMBOL(pci_bus_size_bridges);
 
 static void assign_fixed_resource_on_bus(struct pci_bus *b, struct resource *r)
 {
-	int i;
 	struct resource *parent_r;
 	unsigned long mask = IORESOURCE_IO | IORESOURCE_MEM |
 			     IORESOURCE_PREFETCH;
 
-	pci_bus_for_each_resource(b, parent_r, i) {
+	pci_bus_for_each_resource(b, parent_r) {
 		if (!parent_r)
 			continue;
 
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e1277a2bb645..70a4684d5f26 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1446,10 +1446,19 @@ int devm_request_pci_bus_resources(struct device *dev,
 /* Temporary until new and working PCI SBR API in place */
 int pci_bridge_secondary_bus_reset(struct pci_dev *dev);
 
-#define pci_bus_for_each_resource(bus, res, i)				\
-	for (i = 0;							\
-	    (res = pci_bus_resource_n(bus, i)) || i < PCI_BRIDGE_RESOURCE_NUM; \
-	     i++)
+#define __pci_bus_for_each_resource_0(bus, res, ...)			       \
+	for (unsigned int __b = 0;					       \
+	     res = pci_bus_resource_n(bus, __b), __b < PCI_BRIDGE_RESOURCE_NUM;\
+	     __b++)
+
+#define __pci_bus_for_each_resource_1(bus, res, __b)			       \
+	for (__b = 0;							       \
+	     res = pci_bus_resource_n(bus, __b), __b < PCI_BRIDGE_RESOURCE_NUM;\
+	     __b++)
+
+#define pci_bus_for_each_resource(bus, res, ...)			       \
+	CONCATENATE(__pci_bus_for_each_resource_, COUNT_ARGS(__VA_ARGS__))     \
+		    (bus, res, __VA_ARGS__)
 
 int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
 			struct resource *res, resource_size_t size,
-- 
2.40.0.1.gaa8946217a0b